Home

Tektronix 070-8993-00 User's Manual

1. 420 00 MHz 426 00 MHz 432 00 MHz 438 00 MHz 444 00 MHz 450 00 MHz 456 00 MHz 462 00 MHz 468 00 MHz 474 00 MHz Channel Frequency 480 00 MHz 486 00 MHz 492 00 MHz 498 00 MHz 504 00 MHz 510 00 MHz 516 00 MHz 522 00 MHz 528 00 MHz 534 00 MHz 540 00 MHz 546 00 MHz 552 00 MHz 558 00 MHz 564 00 MHz 570 00 MHz 576 00 MHz 582 00 MHz 588 00 MHz 594 00 MHz 600 00 MHz 606 00 MHz 612 00 MHz 618 00 MHz 624 00 MHz 630 00 MHz 636 00 MHz 642 00 MHz 90 00 MHz 96 00 MHz 102 00 MHz 108 00 MHz 114 00 MHz Appendix D Channel Tables Table D 3 Broadcast Channel Table Channel Frequency Channel D 4 Frequency 55 25 MHz 61 25 MHz 67 25 MHz 77 25 MHz 83 25 MHz 175 25 MHz 181 25 MHz 187 25 MHz 193 25 MHz 199 25 MHz 205 25 MHz 211 25 MHz 471 25 MHz 477 25 MHz 483 25 MHz 489 25 MHz 495 25 MHz 501 25 MHz 507 25 MHz 513 25 MHz 519 25 MHz 525 25 MHz 531 25 MHz 537 25 MHz 543 25 MHz 549 25 MHz 555 25 MHz 561 25 MHz 567 25 MHz 573 25 MHz 579 25 MHz 585 25 MHz 591 25 MHz 597 25 MHz 603 25 MHz 609 25 MHz 615 25 MHz 621 25 MHz 627 25 MHz 633 25 MHz 639 25 MHz 645 25 MHz 651 25 MHz 657 25 MHz 663 25 MHz 669 25 MHz 675 25 MHz 681 25 MHz 687 25 MHz 693 25 MHz 699 25 MHz 705 25 MHz 711 25 MHz Channel TDC5 User Manual Frequency 717 25 MHz 723 25 MHz 729 25 MHz 735 25 MHz 741 25 MHz 747 25 MHz 753 25 MHz 759 25 MHz 765 25 MHz 771 25 MHz 777 25 MHz 783 25
2. To change the tuning method advance through the menu until TUNING flashes Press the enter key CHANNEL TABLES will appear followed by the current selection Press the enter key again to make the current selection flash then use the up or down key to change the selection Press enter to register the change then press the front panel MENU key to return to the main menu Program Presets The PROGRAM PRESETS command allows you to specify frequency input and AGC information in a preset without affecting current instrument settings To program a preset advance through the menu until PROGRAM PRESETS flashes then press the enter key The preset number will flash use the up and down keys as desired to change to a preset between 1 and 200 The preset number can be changed again and will continue flashing until the enter key is pressed When the enter key is pressed FREQ the frequency command will be displayed Select Frequency Input and AGC settings as described earlier in this discussion pressing the enter key each time to register the changes Program Comm Port 3 8 The TDC5 can be remotely controlled through a PC using RS232 and if necessary a modem link However if several units will be remotely controlled at the same remote site use an RS485 connec tion with a communication box Before using the RS232 or RS485 interface appropriate comm port settings must be selected TDCS User Manual Menu Reference First
3. RECPRT Description Selects or requests the current preset RECPRT Condition Trans data Notes RECPRT Condition Rec data Data description pres_nr Example Command Condition Result E 22 remote flag l BYTE pres nr 1 200 The data in pres nr becomes the current setting of the TDCS Automatically sets the tuning mode to PRESET remote flag and TUNING 4 I BYTE pres nr 1 200 Number of the recalled preset RECPRT remote flag TRUE and TUNING 4 Returns the value of the current preset TDCS User Manual PRESET Description Sets or requests the stored preset data of the TDCS without affecting the present operation of the TDCS PRESET Conditions Trans data PRESET Conditions Trans data Rec data Data description pres nr TDCS User Manual remote_ flag 1 BYTE 2 BYTE 3 WORD 5 WORD BYTE 8 BYTE 9 BYTE 10 BYTE il CHARCO remote flag BYTE BYTE 2 WORD 4 WORD 6 BYTE 7 BYTE 8 BYTE 9 BYTE CHAR 10 pres nr input freqH_ val freqL val agc state rf att val if att val delay val name pres nr input fregH val fregL_val agc state rf att val if att val delay val name 1 200 1 2 3 4 45 860 0 999 Oor I 0 45 dB 0 15 dB 0 120 sec 1 200 1 2 3 4 45 860 0 999 Oor 0 45 dB 0 15 dB 0 120 sec Number of the recalled preset See INP FREQ AGC C RF ATT I
4. 60 to 860 MHz 2 135 CATV STD 1 99 HRC 2 78 BROADCAST 0 1208 TOTAL ATTEN 0 60 dB 0 15 dB 0 45 dB Preset 1 200 PRESET FREQ TUNE BROADCAST CHANNEL TABLE BRO CATV STD Program Presets 1 200 for FREQ INP AGC DELAY IF and RF attenuation MESSAGES ENABLE DISABLE RS485 RS232 BAUD RATE 1200 19200 Front Panel Button Main Menu Commands ADDRESS 00 3FHEX submenus SEND TEST Possible Settings MESSAGE Press to send Figure 3 1 TDC5 Menu Hierarchy 3 2 TDCS User Manual X Menu Reference NOTE BEFORE PROCEEDING READ THE MENU OVERVIEW ON PAGE 3 1 If desired refer also to step by step procedures beginning on page 2 5 The following instructions require that you press the front panel MENU key before proceeding and again when finished to enter and exit the menu The menu commands are presented here in the order that they appear on the TDC5 display The first line of the menu begins with FREQ CH or PR depending on the setting of the TUNING command Frequency FREQ The frequency command allows you to tune the input signal by frequency from 50 860 MHz Frequency settings can also be stored in the presets see SAVE AS or PROGRAM PRESETS The frequency command appears as FREQ in the menu display and is present only if selected through the tuning command To change the frequency setting advance through the menu commands unt
5. Appendix E describes the remote commands Appendix F details remote interface Index appears at the end of the manual TDC5 User Manual Introduction The Tektronix TDC5 Tunable Down Converter is capable of converting any television RF signal in the range of 50 to 860 MHz into an IF signal of 45 75 MHz The high performance of the conversion guarantees a measurement quality signal after demodula tion The TDCS is designed for multichannel cable television applications Its gain control system evaluates the incoming signals to determine the ideal compromise between optimum signal to noise ratio and minimum intermodulation distortion The TDCS is 19 wide by one rack unit high Any of the four rear pane RF inputs can be selected as the source signal to be output The signal can be tuned by channel by frequency or by preset As many as 200 presets can be stored and recalled with different configurations for input tuning and automatic gain control Most instrument functions can also be controlled through the remote interface Remote connectors 9 pin and 25 pin are available at the rear panel The interface type RS232C or RS485 is configured through the menu User defined addresses allow multiple units to be connected for remote control System Applications The DS1200 Cable Television Demodulator System consists of a TDCS Tunable Down Converter and a TDMS Television Demodula tor The package provides accurate tu
6. the neutral conductor Only the line conductor is fused for over current protection Systems that have both current carrying conductors live with respect to ground such as phase to phase on multiphase systems are not recommended as power sources A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Check to see if the TDCS mains voltage setting matches your AC power source voltage In Figure 1 1 the arrow that points to the small rectangle indicates the mains voltage setting If it does not match change the mains voltage setting as follows TDC5 User Manual 1 3 Installation Changing the Mains Voltage 1 Disconnect the power cable from the TDC5 2 Pull the voltage selector straight out of the rear panel rotate it by 180 then plug it back in The fuses are automatically placed in the correct position for operation 3 Referring to Figure 1 1 verify that the arrow pointing to the rectangie now indicates the correct voltage setting 4 Reconnect the TDCS to the AC power source Power On Push the rear panel Power switch to the 1 position on The green POWER indicator should be illuminated and the front panel display shouid show the current operating settings Mains voltage set for 110 120 V Power Switch Voltage Selector Mains voltage set for 220 240 V Power Switch Voltage Selector Figure 1 1 Rear panel Input Connector 1 4 TDCS Use
7. 125 799 25 MHz 126 805 25 MHz 127 811 25 MHz 128 817 25 MHz 129 823 25 MHz 130 829 25 MHz 131 835 25 MHz 132 841 25 MHz 133 847 25 MHz 134 853 25 MHz 135 859 25 MHz Channel Frequency 631 25 MHz 93 637 25 MHz 94 643 25 MHz 95 91 25 MHz 96 97 25 MHz 97 103 25 MHz 98 109 25 MHz 99 115 25 MHz 100 649 25 MHz 101 655 25 MHz 102 661 25 MHz 103 667 25 MHz 104 673 25 MHz 105 679 25 MHz 106 685 25 MHz Frequency 691 25 MHz 108 697 25 MHz 109 703 25 MHz 110 709 25 MHz 111 715 25 MHz 112 721 25 MHz 113 727 25 MHz 114 733 25 MHz 115 739 25 MHz 116 745 25 MHz 117 751 25 MHz 118 757 25 MHz 119 763 25 MHz 120 769 25 MHz 121 775 25 MHz D 2 TDC5 User Manual Table D 2 HRC Channel Table Channel Frequency 72 00 MHz 54 00 MHz 60 00 MHz 66 00 MHz 78 00 MHz 84 00 MHz 174 00 MHz 180 00 MHz 186 00 MHz 192 00 MHz 198 00 MHz 204 00 MHz 210 00 MHz 120 00 MHz 126 00 MHz 132 00 MHz 138 00 MHz 144 00 MHz 150 00 MHz 156 00 MHz 162 00 MHz 168 00 MHz 216 00 MHz 222 00 MHz 228 00 MHz 234 00 MHz 240 00 MHz 246 00 MHz 252 00 MHz 258 00 MHz 264 00 MHz 270 00 MHz 276 00 MHz TDC5 User Manual Channel Frequency 282 00 MHz 288 00 MHz 294 00 MHz 300 00 MHz 306 00 MHz 312 00 MHz 318 00 MHz 324 00 MHz 330 00 MHz 336 00 MHz 342 00 MHz 348 00 MHz 354 00 MHz 360 00 MHz 366 00 MHz 372 00 MHz 378 00 MHz 384 00 MHz 390 00 MHz 396 00 MHz 402 00 MHz 408 00 MHz 414 00 MHz
8. AGC OFF Recalling Presets Tuning by Preset 2 14 1 Using the SAVE AS or PROGRAM PRESETS command as described in the previous step save the desired instrument operating information to a preset Press the MENU key to exit the menu Make a note of the current instrument operating information that is displayed on the LED readout Press the MENU key to enter the menu again Advance through the menu until TUNING is flashing The display will be similar to Figure 2 3 Press the enter key The word CHANNEL TABLE will flash and the display will be similar to Figure 2 4 Press the enter key again The word s to the right of CHANNEL TABLE will flash Use the up or down key to select PRESET Press the enter key to accept the selection Press MENU to return to the main menu Use the down key to sequence through the menu until PR flashes The display will be similar to Figure 2 9 a Press the enter key The preset number to the right of PR will flash TDCS User Manual Operating Procedures b Use the up or down key to select the preset number that you saved in step I Press the enter key and the operating parameters of the TDCS will be changed according to the selected preset Note that the quick check mode is not active for presets the enter key must be pressed before the change is effective At this point you can return the instrument to the factory default settings by recalling a preset that you ha
9. advance through the menu until PROGRAM COMM PORT flashes then press the enter key Five different topics can now be accessed with the up and down keys The following paragraphs describe each topic After making changes press the MENU key to return to the main menu Messages The TDCS can send messages to the PC It is possible to change the message mode to disable this link The PC would stili control the TDC5 however After selecting PROGRAM COMM PORT press the up or down key until MESSAGES flashes Press the enter key and the mode enable or disable will flash Use the up or down key to change the mode then press enter fo register the change Type The communication type can be set for RS232 or RS485 A direct link between a TDCS and a PC uses RS232 interface When several units will be remotely controlled by a PC use a communication box and RS485 interface After selecting PROGRAM COMM PORT press the up or down key until TYPE flashes Press the enter key and the communication type RS485 or RS232 flashes Use the up or down key to change the setting then press enter to make the change effective Baud Rate The baud rate can be set to 1200 2400 4800 9600 or 19200 baud Select the baud rate according to the device that will be connected to the TDCS For a direct link between the TDC5 and a PC select identical baud rates for both units For communication via a communication box select the baud rate according to the un
10. otherwise pressing the down key again will change to a different setting Up Key Use the up key 1 to go back through menus and menu settings Press the enter key 1 after changing a menu setting otherwise pressing the up key again will change to a different setting Enter Key Press the enter key 1 to accept a change you have made to a menu setting otherwise pressing the left or menu key TDC5 User Manual 2 1 Functional Overview will reset to the previous setting and pressing the up or down key will change to a different setting 7 MENU Key Press MENU to enter and exit the menu mode Depending on the menu line it will be necessary to press the key once twice or three times to exit the menu and return to instrument operating mode Press the enter key 1 after changing a menu setting otherwise pressing the menu key will restore the previous setting and ignore the change 8 Power Switch When setto on 1 the power switch turns on the TDCS5 When the TDCS is turned off 0 all settings and preset channels are retained in memory 9 Power Input Connector Accepts AC power cord assembly that is shipped with the product 10 Voltage Selector The position of the voltage selector determines the mains voltage setting The mains fuses for 110 120 V and 220 240 V operation are also located here Fuse replacement is described in Appendix B and instructions for changing the mains voltage setting are on page 1
11. 1 broadcast D 4 CATV D I HRC D 3 Char E4 Condition E 4 Condition flag E 4 condition flags E 9 Connectors 2 1 Contents E 4 Controls 2 TDCS User Manual Delay 2 11 3 6 DELAY remote command E 17 DISC remote command E 6 Display adjustment C 2 Down key 2 1 DS1200 1 1 E Electrical installation 1 3 Electrical specification A 1 Enter key 2 1 F Format E 4 FREQ 3 3 FREQ remote command E 13 Frequency 3 3 Front panel controls 2 1 display 2 1 illustration 2 3 Fuse 1 2 TDN remote command E 9 IF attenuation 2 11 3 7 output 3 5 A 2 output connector 2 2 TF_ATT remote command E 16 INP 2 10 index 1 Index INP remote command E 12 Input 2 10 3 5 Input connectors 2 2 Installation 1 3 Internal error 2 1 L LCD display 2 1 adjustable C 2 Left key 2 1 Local state E 5 LOG remote command E 10 M Mains voltage setting 1 3 Mechanical installation 1 5 Menu commands 3 3 3 10 Menu key 2 2 Menu overview 3 1 Menu tree 3 2 Messages 3 9 Modem 3 8 MSG remote command E 7 MSG C remote command E 25 N Name E 5 O Offset E 5 On Off switch 2 2 Operating procedures 2 5 Operating temperature 1 5 Operator s checkout procedure 1 9 Index 2 OPTMEM remote command E 29 Output 3 5 Output connector 2 2 P Packaging C 1 PATH remote command E 11 PC communications 3 8 3 10 B 1 Performance requirements
12. 2 Figure C 1 Circuit Board Layout Showing Location of PI C2 List of Tables Table B E RS232 Pin Connections aso radio anes B 1 Table B 2 RS485 Pin Connections B 2 Table D 1 CATV Standard Channel Table D 1 Table D 2 HRC Channel Table src op D 3 Table D 3 Broadcast Channel Table romo D 4 Table F 1 Sp cial Bytes osi xo oe Ra Sh Ras F i Table F 2 Windows Terminal Program F 2 iv TDCS5 User Manual User Safety Summary Please take a moment to review these safety precautions They are provided for your protection and to prevent damage to the product This safety information applies to all operators Terms Appearing in Manuals CAUTION Caution statements identify conditions or practices that could result in damage to the equipment or other property WARNING Warning statements identify conditions or practices that could result in personal injury or loss of life Terms Appearing on Equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself DANGER indicates a personal injury hazard immediately accessible as one reads the marking Symbols Appearing on Equipment 4 AN DANGER Protective ground ATTENTION High Voltage earth terminal Refer to manual TDC5 User Manual V Precautions vi Power Source This product is designed to operate
13. 3
14. A 1 Physical characteristics A 4 Polling the TDC5 F 5 Power cord 1 2 indicator 2 1 input connector 2 2 source 1 3 Switch 2 2 PR 3 5 PRESET remote command E 23 Presets 2 12 2 14 3 5 3 7 3 8 Program comm port 2 16 3 8 Program presets 2 12 3 8 Protocol F 1 PWD remote command E 6 R Rack mount kit 1 2 Rack mounting 1 5 Rear panel illustration 2 3 Recall presets 2 14 3 5 Received data E 5 RECPRT remote command E 22 Remote commands E 1 command descriptions E 6 list of commands E 1 terms used E 4 TDC5 User Manual Remote control 2 16 3 8 B 1 addresses F 2 handshaking F 1 hardware F MSG communication F 6 polling the TDC5 F 5 programming sequences F 2 protocol F 1 receiving data F 4 sample communication F 5 sending data F 3 Remote state E 5 REPORT remote command E 28 RF attenuation 2 11 3 7 input 3 5 A input connectors 2 2 RF ATT remote command E 15 RS232 connector 2 2 B 1 enable 3 9 RS485 connector 2 2 B 2 enable 3 9 S Save As 2 12 3 7 Send Test Message 3 10 TDC5 User Manual Index SETT remote command E 19 Specifications A I Standard accessories 1 2 STAT remote command E 26 T TDMS 1 1 Transmitted data E 5 Tuning 2 7 3 8 channel 2 8 3 4 frequency 2 8 3 3 presets 2 14 TUNING remote command E 21 U Up key 2 1 V Voltage selector 2 2 Voltage mains 1 3 W Word E 5 Index
15. BYTE agc state Qori 0 OFF i ON AGC Cz 1 Remote flag TRUE The AGC is on TDC5 User Manual Appendix E Remote Commands RF ATT Description Sets or requests the total RF attenuation value RF ATT Condition Trans data Notes RF ATT Condition Notes Rec data Data description Rf att val Example Command Condition Result TDCS User Manual remote flag I BYTE rf tt val 0 45 dB If AGC ON the TDCS restarts the gain regulation from rf att val remote flag If AGC ON the query command returns the momentary input attenuator value I BYTE rf att val 0 45 dB Total RF attenuation value RF ATT H4 remote flag TRUE The RF attenuation will be set to 24 dB E 15 IF ATT E 16 Description Sets or requests the IF attenuation value IF_ATT Condition Trans data Notes IF ATT Condition Notes Rec data Data description If att val Example Command Condition Result remote flag BYTE if_att_val 0 15 dB If AGC ON the TDCS restarts the gain regulation from if att val remote flag If AGC ON the query command returns the momentary output attenuator value I BYTE if att val 0 15 dB IF attenuation value IF ATT 9 remote flag TRUE The output attenuation will be set to 9 dB TDC5 User Manual Appendix E Remote Commands DELAY Description Sets or requests the A
16. Controls and Connectors Ls userid e 2 1 Operating Procedures ov sis ei oa ewe es oig ERROR na 2 5 Instrument Power On Lune dis voee ext ku REUS 2 5 Enter th Meta oa 2 5 Select Tuning Method TUNING 0 dod xw 2 7 Tone FREQ OF CED V o vua me xia evo VUE ES ES Es ed 2 8 Input NP ane ticle alo a E d Nace eoe tt 2 10 Automatic Gain Control AGC e 2 10 Delay DELANTE WEM arri 2 11 Attenuation RE IF TOTAL 2 11 Storing Presets PROGRAM PRESETS and SAVE AS 2 12 Recalling Presets Tuning by Preset 2 14 Set Up Remote Interface PROGRAM COMM PORT 2 16 TDC5 User Manual Table of Contents Reference Menu Overview ues v oue remind rb ex Dee sosie dites 3 Quick Gue si deoa bod C DRE pue Pater eos Ars 3 Menu Referente AA tei 3 3 Frequency FREQ coeno TIE 3 3 Channel dC Ha frei earn 3 4 Presets PR A ahi ere reet iae 3 5 PUE RR ety RE E ea a FR rand 3 5 BOE AA ab kA AAS we A REE et 3 5 RO SERE ERRE DE CSS RE O 3 6 Total Attenuation piva xcv a RE Y 3 6 IP Attenuation erarnan ILA LO 3 7 RF Attenuation eee rds A CES rs 3 7 Sava iene ariete 3 7 TUNE sita aa pi rele 3 8 Program Presets 14d ex uoce order DE o s du NA 3 8 Program Comm Port iria ia aid 3 8 Messages ppe edente vox PEOR AIR TOR SA RR 3 9 Typer EE Pr ET 3 9 Baud Rajnas Les ai d e o m Xe Va we RESO 3 9 Address a Hu ACC NL ise y PRAESES Nu ase ate ke 3 10 Send Test Message i oos poe I eI m PC
17. Processor Board IF1 IF2 Converter Processor and Memory Board Comb Mixer Board Comb Generator LO3 Oscillator Board L01 L02 Synthesizer Phase Comparator Power Supply Board TDC5 FRONT Figure C 1 Circuit Board Layout Showing Location of P1 C 2 TDCS User Manual Appendix C User Service Changing the Mains Voltage Setting Check to see if the TDCS mains voltage setting matches your power source voltage as described on page 1 4 If it does not match change the mains voltage setting as follows I 2 Disconnect the power cable from the TDCI Pull the voltage selector straight out of the rear panel rotate it by 180 then plug it back in The fuses are automatically placed in the correct position for operation Referring to Figure 1 1 verify that the new voltage setting matches your AC supply voltage Reconnect the TDCS to the AC power source Fuse Replacement 1 2 Disconnect the power cable from the TDCS rear panel Remove the voltage selector from the power input connector by pulling straight out The fuse corresponding to the selected source voltage is on top of the fuse holder Pull the old fuse up and out and replace it with a new fuse of the same type Use only 250 V 1 A fuses Check the arrows on the fuse holder to be sure you have placed the fuse in the correct location 110 120 V or 220 240 V Cleaning the TDC5 The instrument should be cleaned often enough t
18. SET attenti NOTE These procedures require you to be in the menu mode However in normal use you would make change s then return to the instrument operating mode You can exit the menu at any time by pressing the MENU key again Depending on the level of submenu selected the key must be pressed once twice or three times to return to instrument operating mode Note that the display does not flash in the operating mode NOTE After changing a menu setting in the following procedures you will be instructed to press the enter key to accept the change This means that if the enter key is not pressed first pressing the left or MENU key will reset the change and pressing the up or down key will change to a different setting LE CH 2 CATV STD INP AGC ON DELAY 0 1 S Figure 2 2 The TDC5 Display After Selecting MENU 2 6 l TDC5 User Manual Select Tuning Method TUNING 1 Press the down key to advance through the menu commands until the word TUNING is flashing The display will be similar to Figure 2 3 2 Press the enter key The word CHANNEL TABLE will flash and the display will be similar to Figure 2 4 3 Press the enter key again The words to the right of CHANNEL TABLE will flash Use the up or down key to select FREQ TUNE CATV BROADCAST or HRC Do not select PRESETS at this time they will be discussed in a later step 4 Press the enter key to accept the selection Press the MENU key to return to
19. addresses a TDC5 that is busy repeats the addressing phase until the TDCS returns a ready phase then the PC sends the MSG command PC gt DLE ENQ Ad Ars Send addressing phase TDC5 gt DLE ACKO Ad Ars Ready phase PC gt DLE STX MSG DLE ETX Data phase After receiving the MSG command the TDCS places its answer in its transmit buffer and the PC retrieves the message with a receive phase The data in this example 20h indicates that a test message has been generated Other bit patterns are listed with the MSG command PC gt DLE ENQ Ad Arr Receive addressing phase TDC5 gt DLE STX Ad Arr 20h DLE ETX Data phase The PC acknowledges the data by sending the MSG command followed by the data bit pattern The PC will continue to poll but this data will not be reported again PC gt DLET ENQ Ad Ars Send addressing phase TDC5 gt DLE ACKO Ad Ars Ready phase PC gt DLE ESTX MSG 20h DLE ETX Data phase F 7 TDCS User Manual TDC5 User Manual F 8 Index A Accessories 1 2 cable BNC 1 2 power cord 1 2 rack mount kit 1 2 replacement fuse 1 2 trim adjustment tool 1 2 Address 3 10 Adjusting the display C 2 AGC 2 10 3 5 AGC C remote command E 14 Attenuation 2 11 3 6 Automatic gain control 2 16 3 5 B Baud rate 3 9 Byte E 4 C CH 3 4 Channel 3 4 CHANNEL remote command E 18 Channel tables 3 4 3 8 D
20. dB 0 120 sec The new settings are effective immediately Conditions remote flag Rec data Data description BYTE input WORD freqH val WORD freqL val BYTE age state BYTE rf att val BYTE if att val BYTE delay val CHAR 10 name 1 2 3 or 4 45 860 0 999 Oor 1 0 45 dB 0 15 dB 0 120 sec Refer to the INP FREQ AGC C RE ATT IF ATT and DELAY command descriptions TDC5 User Manual E 19 Appendix E Remote Commands Example Command SETT Condition remote flag TRUE Resuit E 20 This command returns the current setting of the TDCS 1 0 45 1 244 0 10 9 0 32 32 32 32 32 3 32 32 32 32 Input 1 Frequency 45 5 MHz AGC off RF attenuator 10 dB IF attenuator 9 dB No delay is present Name is filled in with space characters see ASCII code TDC5 User Manual TUNING Description Appendix E Remote Commands Sets or requests the tuning mode TUNING Condition Trans data Notes TUNING Condition Rec data Data description mode Example Command Condition Result YTDC5 User Manual remote flag BYTE mode 0 1 2 3 or 4 Can change the current TDCS tuning mode remote flag 1 BYTE mode 0 1 2 3 or 4 0 CATV STD I HRC 2 BRDCST 3 FREQ TUNE 4 PRESET TUNING remote flag TRUE Returned data of 4 means TDCS is in preset mode E 21 Appendix E Remote Commands
21. data 1 BYTE input 1 2 3 or 4 INP Condition remote_flag Rec data BYTE input 1 2 3 or 4 Data description Input The selected input of the TDCS Example Command INP 4 Condition remote flag TRUE Result The input of the TDC5 will be set to 4 E 12 TDCS User Manual Appendix E Remote Commands FREQ Description Sets or requests the frequency of the FDCS FREQ Condition Trans data Notes FREQ Condition Rec data Data description freqH_val freqL val Example Command Condition Result TDC5 User Manual remote_flag 1 WORD freqH_val 45 860 3 WORD freqL_val 0 999 Automatically sets tuning mode to FREQ TUNE remote flag 1 WORD freqH_val 45 860 3 WORD freqL_val 0 999 The integer part of the frequency in MHz The fractional part of the frequency in 1 1000 MHz FREQ 1 100 0 250 remote flag TRUE fregH 1 100 1x256 100 356 MHz fregL 0 250 250 KHz The total frequency in this example is 356 250 MHz E 13 Appendix E Remote Commands AGC C Description Sets or requests the state of the AGC automatic gain control AGC C Condition Trans data Notes AGC C Condition Rec data Data description agc state Example Command Condition Result E 14 remote flag I BYTE agc_state O or 1 If the AGC is toggled from off to on there will be no Delay See DELAY command remote_flag
22. data Accepts any value from 0 to 255 Example Conditions remote_flag TRUE Command OPTMEM 10 T E ITS HT Result This command writes the word TEST in the user memory on offset 10 TDCS User Manual E 29 Appendix E Remote Commands E 30 TDC5 User Manual Appendix F Remote Communication This appendix section tells how to program the remote control communications Remote commands are described in Appendix E Protocol The TDCS uses the BCP Simplified Communication Link Protocol SCL which has the following parameters Speed 1200 2400 4800 9600 or 19200 bps as set by the TDCS Character format 1 start bit 8 data bits 1 stop bit Hardware RS485 or RS232 depending on the TDCS settings Handshaking If RS232 RTS CTS hardware handshaking is used the TDCS activates RTS and waits for transmission until CTS is active for a maximum period of 5 seconds With SCL Protocol data can be sent and received using the standard 1 O functions found in most programming languages such as C PASCAL and BASIC The SCL Protocol is an asynchronous binary protocol not text or ASCII based Communication is based on bytes ranging from 0 to 255 Special bytes are listed in Table F 1 Table F 1 Special Bytes cac ason Description Carvers Character ASCII Description Characters ACKO WACK A Device address A User defined remote address A A Receive remote address Remote addresses are user d
23. same bus The TDCS answers with a ready phase if it is ready to receive data or a not ready phase if it is not ready Sample send communication between the PC and TDC5 follows with descriptions in italics The PC addresses a TDCS that is not ready to receive data PC gt DLE ENQ Ad Ars Addressing phase TDC5 gt DLE WACK Not Ready phase The PC addresses a TDCS that is ready and the PC sends data PC gt DLE ENQ Ad Ars Addressing phase TDC5 gt DLE ACKO Ad Ars Ready phase PC gt DLE STX Data DLE ETX Data phase The not ready phase can be ignored the PC can transmit the addressing phase and the data phase at once even though it does not know if the TDC5 is ready to receive data In this situation a nof ready transmission from the TDCS is aborted after receiving the first byte of the data phase so that the PC receives only a DLE character The PC addresses a TDCS that is not ready ignores the not ready phase and sends data PC gt DLE ENQ Ad Ars Addressing phase TDC5 DLE Aborted Ready phase PC gt DLE STX Data DLE ETX Data phase When sending data Ad and Ars can be replaced by FF hex a wild card address When the TDCS gives a ready phase it will send its real address This allows the PC to determine the address of a TDCS The wild card remote address is always a send remote address even though it is an odd address TDCS User Manual Appendix F Remote Com
24. the SAVE AS or PROGRAM PRESETS commands Possible channel settings are 2 135 CATV STD 1 99 HRC 2 83 Broadcast Channel tables are shown in Appendix D The channel command is available only if one of the channel tables is selected through the tuning command It appears as CH in the menu display and is followed by the currently selected channel number and channel table To change the channel table refer to the tuning command instructions To change the channel number advance through the menu com mands until CH flashes then press the enter key The channel number will flash use the up and down keys to change the channel After two seconds the new channel will automatically become effective This is referred to as the quick check mode Measure ments can be made in this mode if desired However to keep the new channel setting the enter key must be pressed Otherwise pressing the left key or MENU key will reset to the previous channel and pressing the up or down key will change to a different channel After pressing the enter key you can press the MENU key to return to the instrument operating mode or remain in the menu mode and modify additional instrument parameters TDCS User Manual Menu Reference Presets PR The preset command allows you to reset the current instrument operating parameters to information stored in any of the 200 presets Use the SAVE AS or PROGRAM PRESETS commands to store or mod
25. the up or down key to set the total attenuation between 0 and 60 dB Press the enter key to accept the change b Advance until the IF attenuation value is flashing then press the enter key Use the up or down key to set the attenuation between 0 and 15 dB Press the enter key to accept the change c Advance until the RF attenuation value is flashing then press the enter key Use the up or down key to set the attenuation between 0 and 45 dB Press the enter key to accept the change TDCS User Manual 2 11 Operating Procedures ii AGC OFF ATTENUATION TOTAL OdB RF 0dB Figure 2 6 Setting Attenuation AGC OFF Storing Presets PROGRAM PRESETS and SAVE AS PROGRAM PRESETS allows you to modify preset information SAVE AS allows you to save the current operating parameters to a preset for later recall AH 200 presets have identical factory settings 1 Use the up or down key to sequence through the menu until PROGRAM PRESETS is flashing Press the enter key The display will be similar to Figure 2 7 with the preset number flashing a Use the up or down key to select Preset 1 or any preset number between 1 and 200 for modification Press the enter key the frequency will now flash b Use the up or down key to select a frequency between 50 and 860 MHz Press the enter key to store the selection Now INPUT will flash 2 12 TDCS User Manual Operating Procedures c Press the enter key and the n
26. 25 STAP o ga koe A detect ues dua tM a AU qu ie ares E 26 REPORT deed arg cn cme tease e d resto A EA apa E Me E 28 OPTMEM seii es da HARE OPERIS DER SS apte dons E 29 Appendix F Remote Communication 2 4 edo hn s F 1 Protocol Se Ole aa God To Quae Daci F 1 Using Terminal Programs ueri amendes tan F 2 PES PE PPT E fa AAA DOS F 2 Sending Data to the TDCI oo ee nc cs na doles aa ee an F 3 Receiving Data from the TDCS sente ere F 4 Polio the 1D Do AS LA F 5 Index Index DEOS Veo pe s CER an re Va DC Index 1 TDCS User Manual iii Table of Contents List of Figures Figure 1 1 Rear panel Input Connector 14 Figure 1 2 Installing Rackmount Hardware 1 7 Figure 2 1 TDCS Front and Rear Panels 2 3 Figure 2 2 The TDC5 Display After Selecting MENU 2 6 Figure 2 3 The TDCS Display After Advancing to TUNING 2 7 Figure 2 4 The TDC5 Display After Selecting TUNING 2 7 Figure 2 5 Tuning by Frequency uoo rr eR Ab 2 10 Figure 2 6 Setting Attenuation AGC OFF 2 12 Figure 2 7 Preset Default Settings oso e ERR eR wh 2 13 Figure 2 8 Programming a Preset AGC OFF 2 14 Figure 2 9 Recalling a Preset 2 15 Figure 2 10 Programming the Communications Interface 2 16 Figure 3 1 TDCS Menu Hierarchy ecce te n 3 2 Figure B 1 Rear panel RS232 Connector B 2 Figure B 2 Rear panel RS485 Connector B
27. 4 11 RS485 Connector This 9 pin D type subminiature connector allows for remote control of most front panel functions via RS485 communication Turn off the TDCS before connecting or disconnecting cables RS485 interface is enabled by menu command 12 RS232 Connector This 25 pin D type subminiature connector allows for remote control of most front panel functions via RS232 communication Turn off the TDC5 before connecting or disconnecting cables RS232 interface is enabled by menu command 13 IF OUT The IF output connector is compensated in 50 Q Specifications for the IF output are given in Appendix A 14 RF Inputs Four different RF input signals can be accommodated by these four inputs Any one of the four RF inputs can be selected for output through the use of menus as described on page 2 10 The connectors are compensated in 75 Q Specifica tions for the RF input are given in Appendix A TDCS User Manual Functional Overview SIA NE 44 SES COS A J8H9AUOD umog jqeun sog NIUOS YNO INOHH Figure 2 1 TDC5 Front and Rear Panels 2 3 TDC5 User Manual Functional Overview 2 4 TDCS User Manual Operating Procedures The TDCS will typically be used as part of a system that includes the Tektronix TDM5 Demodulator The system may also include a Tektronix 1740A Series Waveform Vector Monitor or 1780R Se ries Video Measurement Set Typical equipment hookups can be found in the Operat
28. 5 MHz 6 83 25 MHz 7 175 25 MHz 8 181 25 MHz 9 187 25 MHz 10 193 25 MHz t1 199 25 MHz 12 205 25 MHz 13 211 25 MHz 14 121 25 MHz 15 127 25 MHz 16 133 25 MHz 17 139 25 MHz 18 145 25 MHz 19 151 25 MHz 20 157 25 MHz 21 163 25 MHz 22 169 25 MHz 23 217 25 MHz 24 223 25 MHz 25 229 25 MHz 26 235 25 MHz 27 241 25 MHz 28 247 25 MHz 29 253 25 MHz 30 259 25 MHz 31 265 25 MHz TDCS User Manual 271 25 MHz 277 25 MHz 283 25 MHz 289 25 MHz 295 25 MHz 301 25 MHz 307 25 MHz 313 25 MHz 319 25 MHz 325 25 MHz 331 25 MHz 337 25 MHz 343 25 MHz 349 25 MHz 355 25 MHz 361 25 MHz 367 25 MHz 373 25 MHz 379 25 MHz 385 25 MHz 391 25 MHz 397 25 MHz 403 25 MHz 409 25 MHz 415 25 MHz 421 25 MHz 427 25 MHz 433 25 MHz 439 25 MHz 445 25 MHz This section contains Cable Television Standard HRC and Broadcast channel tables These tables are used by the TDCS when specified by the tuning menu command Frequency 451 25 MHz 457 25 MHz 463 25 MHz 469 25 MHz 475 25 MHz 481 25 MHz 487 25 MHz 493 25 MHz 499 25 MHz 505 25 MHz 511 25 MHz 517 25 MHz 523 25 MHz 529 25 MHz 535 25 MHz 541 25 MHz 547 25 MHz 553 25 MHz 559 25 MHz 565 25 MHz 571 25 MHz 577 25 MHz 583 25 MHz 589 25 MHz 595 25 MHz 601 25 MHz 607 25 MHz 613 25 MHz 619 25 MHz 625 25 MHz D 1 Appendix D Channel Tables Table D 1 CATV Standard Channel Table Con t Channel Channel Frequency 781 25 MHz 123 787 25 MHz 124 793 25 MHz
29. E ATT Input selector b2 RF filter bank H RF_att 5 dB bi Comb b0 LO3 Example Command STAT Condition remote flag TRUE Result This command returns the status of every PC 1 18 0000 0001b 0001 0010 In this example one EEPROM the comb selector and the IF attenuator PC are not functional TDC5 User Manual E 27 Appendix E Remote Commands REPORT Description Requests the current TDCS operating state REPORT Condition Not a valid command REPORT Condition remote flag Rec data 1 BYTE Tic_state 0 1 2 3 or 4 Data description OK RANGING NO SIGNAL OVERLOAD INTERNAL ERROR GC OFF Tic_state always 0 Tic_state PP WN Example Command REPORT Condition remote flag TRUE Result Returned data of 1 means the TDC5 is ranging E 28 TDCS User Manual Appendix E Remote Commands OPTMEM Description Write or read data in the 256 bytes of user space OPTMEM Conditions remote_flag Trans data BYTE offset 0 233 2 ARRAY O 256 offseD data 0 255 OPTMEM Conditions remote_flag Trans data BYTE offset 0 255 2 BYTE length 0 256 offset Rec data ARRAY 0 256 offset data 0 255 Data description offset Offset location of the first bit of transmitted or received data with respect to the 256 bytes of memory length An array can be as short as 0 bytes it can be as long as 256 bytes minus the offset
30. F ATT and DELAY commands E 23 Appendix E Remote Commands Example Command PRESET 105 Conditions remote_flag TRUE Result This command returns the preset data from Preset 105 E 24 TDC5 User Manual Appendix E Remote Commands MSG_C Description Sets or requests the status of the TDC5 message enable When MSG C is toggled from 1 to 0 all pending messages are cleared MSG_C Condition remote_flag Trans data 1 BYTE msg state Oor MSG_C Condition remote flag Rec data 1 BYTE msg state Dori Data description msg state 0 disabled 1 enabled Example Command MSG_C 1 Condition remote_flag TRUE Result The TDCS is now able to generate messages TDC5 User Manual E 25 Appendix E Remote Commands STAT E 26 Description Clears or requests the FC error messages STAT Condition Trans data Notes STAT Condition Rec data Data description remote flag BYTE error mapH bitmap 2 BYTE error mapL bitmap Acknowledges the message by clearing the TRUE bit s defined in the 2 bytes remote flag I BYTE error mapH bitmap 2 BYTE error mapL bitmap Bit is TRUE when an C component is not functional error mapH b7 x b6 x b5 x b4 x b3 x b2 EEPROM bi EEPROM b0 EEPROM TDCS User Manual Appendix E Remote Commands error_mapL b7 FC Det2 b6 Detl b5 RF filter bank I b IF ATT b3 R
31. GC delay value This delay occurs only on the input to the RF attenuators If the AGC is toggled from off to on there will be no delay DELAY Condition remote_ flag Trans data BYTE delay_ val 0 120 sec DELAY Condition remote_flag Rec data BYTE delay_val 0 120 sec Data description delay val The delay value in seconds Example Command DELAY 0 Condition remote_flag TRUE Result No delay is introduced TDC5 User Manual E 17 Appendix E Remote Commands CHANNEL Description Sets or requests the selected channel of the TDCS CHANNEL Condition remote flag Trans data BYTE table O i or 2 2 BYTE channel Notes Automatically sets tuning mode to CHANNEL CHANNEL Conditions remote flag and TUNING 0 1 or 2 Rec data BYTE table 0 1 or 2 2 BYTE channel Data description table 0 CATV STD I HRC 2 BDCST channel Selected channel number Example Command CHANNEL 1 34 Condition remote_flag TRUE Result The TDCS outputs channel 34 of the HRC table E 18 TDCS User Manual Appendix E Remote Commands SETT Description Sets or requests several parameters of the TDCS SETT Conditions remote flag Trans data Special action SETT 0 BYTE input WORD freqH_ val WORD freqL_val BYTE age_ state BYTE rf att val BYTE if att val BYTE delay val CHAR 10 name 1 2 3 or 4 45 860 0 999 Oor 0 45 dB 0 15
32. GC function is described in detail on page 3 5 2 To change the AGC setting press the up or down key to move through the menu until AGC is flashing The display will be similar to Figure 2 5 a Press the enter key The word to the right of AGC will now flash b Use the up or down key to change the setting 2 10 TDC5 User Manual Operating Procedures c Press the enter key to accept the change Delay DELAY 1 When AGC is ON the word DELAY will appear in the menu Press the up or down key to sequence through the menu until DELAY is flashing The display will be similar to Figure 2 5 The first line may vary depending on the tuning selection 2 Press the enter key The number to the right of DELAY will now flash Use the up or down key to set the delay between 0 and 120 seconds See page 3 6 for details on this setting 3 Press the enter key to accept the change Attenuation RF IF TOTAL 1 When AGC is OFF the word ATTENUATION will appear in the menu Press the up or down key to sequence through the attenuation options total IF and RF The display will be similar to Figure 2 6 2 The total attenuation value represents RF attenuation IF attenuation A change to any of these values will affect one or both of the other values Refer to page 3 6 for information about this relationship Attenuation settings can be changed as follows a Press the enter key The total attenuation value will flash Use
33. Japan Australia and New Zealand WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of 1 year from the date of shipment If any such produci proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from i
34. LE ENQ Ad Arr Receive Addressing phase TDC5 gt DLE WACK Not ready phase F 5 TDC5 User Manual Appendix E Remote Communication The PC repeats the addressing phase The TDCS is ready and transmits its data phase There is no data included which means that the TDC5 has no message PC gt DLE ENQ Ad Arr Receive Addressing phase TDC5 gt DLE STX Ad Arr DLE ETX Data phase The PC continuously polls the TDCS PC gt DLE ENQ Ad Ars Send Addressing phase TDC5 gt DLE ACKO Ad Ars Ready phase PC gt DLETISTX PATH DLE ETX Data phase PC DLE ENQ Ad Arr Receive Addressing phase The TDC5 responds with data when it has a message The data is the path Ad Ars which in the sample on page F 2 is OBh 48h TDC5 DLE STX Ad Arr data DLE ETX Data phase The PC responds to the data This acknowledges the message The PC will continue to poll but this message will not be reported again PC gt DLE ENQ Ad Ars Send Addressing phase TDC5 gt DLE ACKO Ad Ars Ready phase PC gt DLE STX PATH DLE ETX Data phase Getting the Message Polling a TDC5 only tells the PC if the device has a message To receive the message the MSG command is required MSG Communication The following example is one continuous MSG communication between the PC and the TDCS TDCS User Manual F 6 Appendix F Remote Communication The PC
35. MHz 789 25 MHz 795 25 MHz 801 25 MHz 807 25 MHz 813 25 MHz 819 25 MHz 825 25 MHz 831 25 MHz 837 25 MHz 843 25 MHz 849 25 MHz 855 25 MHz Appendix E Remote Commands This appendix section is organized as follows W A list of commands and their page numbers m A sample command description which explains the fields that will appear in the following descriptions m Definitions of terms used in the command description W The actual command descriptions organized in functional order Refer to Appendix F for instructions on programming the remote control interface including detailed examples List of Commands AGC C Turns the AGC automatic gain control on or off Requests the current state of the AGC CHANNEL Selects the current TDCS channel Requests the current TDCS channel Sets AGC automatic gain control delay value Requests the current AGC delay value Puts the TDC5 in the local state Requests the current frequency setting of the TDCI Sets unit location Requests TDCS device name and version number Sets the IF attenuation value Requests the current IF attenuation value Sets the TDC5 input 1 4 Requests the current input setting 1 4 E Sets the frequency of the TDCS TDC5 User Manual E 1 Appendix E Remote Commands Sed in roe Requests the remote state of the TDCS MSG Changes status of the TDCS E 7 Requests the current status of the TDCS MSG_C Ena
36. R SCR 3 10 Appendices Appendix A Performance Specification A Electrical Specification Loves 6h nets kn X CRCE ATE EARN ER a A Environmental Characteristics sra dame ans A 3 Physical Characteristics aia iis eI A 4 Appendix Bi Remote Control usaras REPRE B 1 RS232 Communication cessere rele daa B 1 RS485 Communication rr Np veteris e Os B 2 Appendix CH Service v es od ac eue p Tor UO DR dota Mets C 1 Packaging for Shipment x Sucre reser d ues coe mew es C i Adjusting the Display e edad eta dre cia ih Qe e hs C 2 Appendix D Channel Tables uses us a paie art D I Appendix E Remote Commands 4 E l stot Commands 1 da RARO E l ji TDCS User Manual Table of Contents Explanation of Remote Command Descriptions E 3 Terms Used in Remote Command Descriptions E 6 Remote Command Descriptions ecc rpm ias demi gare E 6 A E E 6 DIS SAS LL nee E 6 A an MA re DI a Rd EX Y E 7 IDN TTC DE E 9 0 CRE CIIM E 10 PAT RP lA E 11 DNE V nus raa oT Ce xat e vob de eet o gabe etas a a E 12 FREQ css toe dei e etate he dao eiu ets E 13 AGC C A AREA A e E 14 REATI oss NE QUEE S abies E 15 IE AL ET A du C3 AN S Eoo fosa Made E 16 DELAY era ada ol iran E 17 CHANNEL rosee pae VER x ieri E 18 SERI Pax eub esp glo esca ea ae Hal rem rus E 19 TUNING Iudaei mca Me e VON SOROR E Ja is E 21 RECPRT eter igea inte alana A fa E 22 PRESE Duda vedo RUS Lene DEP D EH E 23 MSG C crea rod eau idee ta idoli qua dU E ud E
37. S Verify that the proper video signals are present on the monitoring equipment If it is necessary to adjust the TDMS video and audio output levels refer to the TDMS manual TDCS User Manual 1 9 Introduction 1 10 TDC5 User Manual Functional Overview Controls and Connectors Front and rear panel controls connectors and indicators are described here and illustrated in Figure 2 1 POWER The green LED is illuminated when power is present Front panel Display The two line LCD display is used to show current operating settings menu commands and error messages When the TDCS is in the standard operating mode the latest settings for Frequency Output and Automatic Gain Control are displayed When the instrument is in the menu mode commands are displayed When a fault occurs INTERNAL ERROR is displayed If this happens turn off the unit wait a few seconds and turn it on again If it still does not work properly contact Tektronix The display is adjustable Refer to page C 2 for instructions Left Key Use the left key to page backwards through menu parameters displayed on screen such as channel frequency or preset parameters Press the enter key 1 after changing a menu setting otherwise pressing the left key will restore the previous setting and ignore the change Down Key Use the down key J to advance through menus and menu settings Press the enter key 1 after changing a menu setting
38. User Manual Tektronix TDC5 Tunable Down Converter 070 8993 00 This document applies for firmware version 1 04 Piease check for change information at the rear of this manual First Printing May 1994 Revised July 1994 Copyright Tektronix Inc 1994 All rights reserved Printed in U S A Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved The following are registered trademarks TEKTRONIX and TEK For further information contact Tektronix Inc Corporate Offices P O Box 1000 Wilsonville OR 97070 1000 U S A Phone 503 627 7111 TLX 192825 TWX 910 467 8708 Cable TEKWSGT Tektronix Television Division participates in the Broadcast Professionals Forum BPFORUM on the CompuServe Information Service Press releases on new products product specific newsletters application information techni cal papers and software libraries for programmable products are among the types of information uploaded Additionally product specialists from Tektronix will be on line to answer questions regarding product applications operation and maintenance Instructions for accessing the information on CompuServe can be found in the current Tektronix Television Products Catalog CompuServe access is currently available in the U S A Canada Europe
39. all of presets Quick Guide The TDCS can be configured as follows Press the front panel MENU key to access the main menu commands which will appear on the front panel LCD display Use the up and down keys T and J to move through the menu until the desired command flashes such as INP for input Press enter 1 Now the actual value or function will flash such as 1 for input 1 If a submenu is present press the up and down keys T and J until the desired submenu item is flashing then press enter J again Use the up and down keys T and J to change the value as desired such as changing the input I to input 2 The value will continue to flash and can be changed again with the up and down keys and J until you press enter 1 For frequency or channel tuning mode two seconds after tuning with the up or down key T or the new frequency or channel becomes effective This is referred to as the quick check mode If desired measurements can be made in this mode before pressing enter 1 To keep the new frequency or channel setting however you must press the enter key 1 If the enter key 1 is not pressed then pressing the MENU key or left key will reset to the previous setting To exit the menu press the front panel MENU key From a submenu it may be necessary to press the MENU key twice or three times to return to instrument operating mode TDC5 User Manual 3 1 Menu Overview
40. ance Requirements in the electrical specifications are valid over an ambient temperature range of 15 C to 35 C Test equipment used to verify Performance Requirements must be calibrated and working within its specified limits Reference Information Information that amplifies a performance requirement or is of special importance is indicated by RI There is no need to check these items to a specific tolerance Electrical Specification Table A 1 RF Input CATEGORY input Level DESCRIPTION REQ 10 dBmV to 60 dBmV single channel Ri 10 dBmV to 460 dBmV for optimum sig nal to noise performance RI Four switchable inputs input Impedance Ri 75 Return Loss REG 10 dB with 0 dB Input attenuation REQ 15 dB with frequencies lt 470 MHz and input attenuation gt 12 dB REQ 12 dB with frequencies gt 470 MHz and input attenuation z 10 dB i Frequency Range REO 50 MHz to 860 MHz TDCS User Manual A 1 Appendix A Performance Specification Table A 1 RF Input Cont CATEGORY DESCRIPTION Channel Tables Ri North American Cable TV Standard Pupe VHF and UHF through channel and HRC channel tables RF Attenuator 0 to 45 dB in 1 dB steps Noise Figure Ri Typically lt 9 dB VHF and lt 11 UHF Table A 2 IF Output CATEGORY DESCRIPTION Output Level REQ 35 dBmV Al Input level 10 dBmV and AGC auto matic REG 5 dBmV Ri Input l
41. ase TDCS User Manual F 4 Appendix F Remote Communication If the byte 10 hex is part of the data this byte will be received twice so that no confusion can exist with the DLE ETX at the end of the data phase Polling the TDC5 If a TDCS has a message it does not send it to the PC because more than one TDCS can be connected to the same remote interface bus and there could be data contention The PC uses polling to check for messages Polling is done with the PATH command PATH returns an empty string if the TDCS has no message and returns the path if the TDCS has a message The path contains Ad Ars see Addressess on page F 2 Polling Communication The following example is one continuous polling communication between the PC and the TDCS The values for Ad Ars and Arr can be calculated according to instructions on page F 2 The PC addresses a TDCS that is busy repeats the addressing phase until the TDCS returns a ready phase then the PC sends the PATH command PC gt DLE ENQ Ad Ars Send Addressing phase TDC5 gt DLE WACK Not Ready phase PC gt DLE ENQ Ad Ars Send Addressing phase TDC5 gt DLE ACKO Ad Ars Ready phase PC gt DLE STX PATH 1 DLE ETX Data phase After receiving the PATH command the TDCS places its answer in its transmit buffer The PC tries to retrieve the message with a receive cycle but the TDC5 has not processed the answer yet PC gt D
42. bles or disables the TDCS message function E 25 Requests the current status of the message enable OPTMEM Writes data in the 256 bytes of user space E 29 Reads data in the 256 bytes of user space PATH Acknowledges receipt of a message E il e rh Polls the TDC5 to see if it has a message Sets the TDCS PRESET data E 23 Requests the current PRESET data Puts the TDCS in the remote state E 6 Selects the active PRESET 1 200 Requests the number of the active PRESET 1 200 PRESET RECPRT 38 EA Es Requests the current TDCS operating state Sets the total RF attenuation value Requests the current total RF attenuation value Sets several parameters of the TDCS STAT TUNING Requests several parameters of the TDCS Clears the C error messages Requests the 12C error messages Sets the TUNING mode Requests the current TUNING mode E 2 TDCS User Manual Appendix E Remote Commands Explanation of Remote Command Descriptions COM MAND The name of the command Description Short description of the command followed by more Data information if needed COMMAND Send command only transmit cycle is needed Condition When the command can be used Trans data The transmitted data that follows COMMAND It is described in four columns Offset Format Name Contents BYTE message bitmap Notes Special actions performed by the
43. can be 0 to 255 l ABCD The contents can be the given character string Bitmap The bitmap is described in the data description FORMAT Format refers to the format of the transmitted or received data It can be BYTE WORD Bitmap ARRAY or CHAR x Example CHAR 10 can be up to 10 characters which can be represented as SABCDEPGHIJ REV JUL 1994 E 4 TDC5 User Manual Appendix E Remote Commands LOCAL STATE The TDCS is in local state if the device can be manually controlled by the front panel The remote flag false NAME Each variable that can be sent or received has a name The named variables are described in the Data description OFFSET The offset is the relative position of the data item in the transmitted or received data The offset starts from so the first byte has OFFSET 1 RECEIVED DATA Rec data The received data is the data received after a receive cycle REMOTE STATE The TDCS is in remote state if the message REMOTE CONTROLLED is displayed The keyboard is disabled so the TDCS can only be controlled by the connected PC The remote flag true TRANSMITTED DATA Trans Data Transmitted data appears directly after the or ofa command in a send cycle WORD A word has 16 bits and is transmitted or received as 2 bytes The MSB Most Significant Byte is followed by the LSB Least Significant Byte TDC5 User Manual E 5 Appendix E Remote Commands Re
44. command COMMAND Query command receive cycle follows transmit cycle Condition When the command can be used Trans data The transmitted data that follows COMMAND It is described in four columns Offset Format Name Contents i BYTE message bitmap Notes Special actions performed by the command Rec data The received data is described in four columns Offset Format Name Contents CHAR 10 device TDCS 11 CHAR 6 version V01 02 device A description of the first Name entry version A description of the second Name entry TDC5 User Manual E 3 Appendix E Remote Commands Terms Used in Remote Command Descriptions BYTE A byte has 8 bits b7 b6 b5 b4 b3 b2 bl b0 Example 65 is the representation of the byte with value 65 041h is the same byte in hexadecimal notation CHAR A character is stored as a normal byte Example A is the representation of the character A with ASCII code 65 CONDITION The condition determines when a command can be used There is a condition flag used by the TDCS This flag must be true if it is used as a condition If a NOT flag is used then the flag must be false Example After the command PWD is sent the TDCS is in remote state and the remote flag TRUE indicating a remote connection between the PC and the TDCS CONTENTS Contents gives the possible values of the named variable O or 1 The contents must be 0 or 1 FALSE or TRUE 0 255 The contents
45. e 1 2 while using this procedure 1 If the provided runners are too long saw off the portion beyond the notch as shown Connect the runners as shown Do not tighten the bolts yet For racks with square holes insert the adapters into the holes then proceed to step 4 NOTE The kit contains four sets of two blocks each For racks with round or square holes all eight blocks will be used to secure the runners to the chassis For racks with threaded holes only four blocks will be used along with the 10 32 screws washers and nuts 4 For racks with round or square holes a Mount the pairs of blocks on the front and back of each side of the rack as shown in the illustration b Insert the screws but do not tighten yet c Place a runner end between each set of two blocks adjusting the length of the runners to fit the rack Tighten the screws at the front and back of the rack For racks with threaded holes mount a single block at the front and back corners of the rack Insert the supplied 10 32 screws Place a runner between each block and the rack then install and tighten the 10 32 washers and nuts Tighten the nuts on the runners Check that all screws and nuts have been carefully tightened Slide the TDCS into the rack making sure that the rack runners fit into the notch in the cooling fins see Figure 1 2 The springs at the front of the TDC5 will click after they are past the front of the rack To remov
46. e TDCS LOG Condition Not a valid command LOG Condition This command is always possible Rec data 1 BYTE log_state O or 1 Data description log state 0 local i remote Example Command LOG Condition This command is always possible Result If 0 is the return value the TDC5 is not in remote state E 10 TDCS User Manual Appendix E Remot PATH Description PATH polls the TDCS to see if there is a message If there is a message the status of the TDCS can be obtained by the MSG command If the messages are disabled with the MSG C command the TDCS will not have a message PATH Condition Notes PATH Condition Rec data Data description This command is always possible Acknowledges the message This command is always possible If the TDCS has a message it will send the path I BYTE device address Ad 2 BYTE remote_address Ars device address Ad is always OB hex for the TDCS remote address Ars is calculated on page 0 2 Example Command Condition Result TDC5 User Manual PATH This command is always possibie If the data Ad Ars is returned it means the TDC5 has a message If there is no message no data will be included in the reply string See page F 5 for a more detailed example E 11 Appendix E Remote Commands INP Description Sets or requests the input of the TDCS INP Condition remote_flag Trans
47. e the unit from the rack press the springs and carefully pull the unit forward and out of the rack TDC5 User Manual Installation e Mes o c 3 t x c Figure 1 2 Installing Rackmount Hardware TDCS User Manual Installation 1 8 TDC5 User Manual Operator s Checkout Procedure The television signal can be applied to any of the four RF INPUTS of the TDC5 The tuned signal at the output of the TDCS will typically be connected to the input of a TDMS The TDMS converts the modulated picture signal to baseband video The output of the TDMS can be viewed on a picture monitor or waveform monitor Basic operation of the TDC5 and TDMS can be verified using the following procedure 1 Use a television signal from either cable feed or antenna Connect the signal to one of the four RF INPUTS on the TDCS Be sure that the input you are using is selected through the INPUT menu command see Section 2 2 Using the provided 50 Q coaxial cable connect the IF OUT signal from the TDCS to the IF IN connector on the TDMS 3 Connect the VIDEO OUTPUT signal of the TDMS to the input of a picture monitor waveform monitor or other monitoring equipment The Tektronix 1780R Series or 1740A Series can be used for this purpose 4 Verify that the TDMS automatic gain control is enabled the front panel LED labeled MAN GAIN should NOT be illumi nated The AGC is enabled disabled through the menu see Section 2
48. efined Refer to the Address description A A A E P K ENQ DLE d r rs rr TDCS User Manual Appendix F Remote Communication Using Terminal Programs The sample in Table F 2 uses the Windows Terminal program to tie selected TDCS remote commands to PC keys F1 through FS Other terminal programs such as Kermit can also be used Batches of commands can be created so that entire sequences can be performed by pressing one key The following pages contain examples of remote communication that can be programmed in this manner Table F 2 Windows Terminal Program PCKey Assigned Key Name Assigned Command Quer Local P E KH P BDISCz P C Fi F2 F3 F4 5 F Addresses To address the TDCS the PC uses a device address of OB hex It also uses a send address Ars when sending data and a receive address Arr when requesting data These addresses are formed as follows W Ar remote address is user defined through the TDCS PROGRAM COMM PORT menu w Ars send remote address Ar x 2 W Arr receive remote address Ar x 2 1 Example If a TDCS is given a remote address of 24 hex its addresses will be m Ad from Table F 1 0B hex m Ars 24 hex x 2 48 hex m Arr 24 hex x 2 I 49 hex TDC5 User Manual F 2 Sending Data to the TDC5 Send Addressing Phase The PC uses Ad and Ars to address the TDCS This aborts all other communication on the
49. emotely controlling the TDCS select the correct comm port settings RS232 Communication The connector is a 25 pin subminiature D type with male contacts and is accessible at the rear panel of the TDCS See Table B I and Figure B 1 Most front panel functions are available through the RS232 remote interface The RS232 interface is enabled through the menu Appendix E describes the remote commands and Appendix F tells how to program sequences of commands through the PC Table B 1 RS232 Pin Connections eee eee i ELI ME p mo E CTC SIR A CA EN E a Pal A ONE ECN IA EC Roli EA E poer LI p E UCE Z Dio rit A TDCS User Manual Remote Contro 25 14 RS232 Figure B 1 Rear panel RS232 Connector RS485 Communication The connector is a 9 pin subminiature D type with male contacts and is accessible at the rear panel of the TDCS See Table B 2 and Figure B 2 The RS485 interface is enabled through the menu Table B 2 RS485 Pin Connections Function Fr Rcs EME CELUI mo ERIC s po ECC pm EN ever i sm 1 9 6 RS485 Figure B 2 Rear panel R5485 Connector B 2 TDC5 User Manual Appendix C Service CAUTION Be sure that power is not supplied to the TDCS while performing any procedures in this section This section contains instructions for user and preventive mainte nance and for adjusting the display If the instrument does
50. er Manual Press the enter key The number to the right of CH will flash Use the up or down key to change to the desired channel Appendix D shows the three available channel tables The new channel selection automatically becomes effective after two seconds This is referred to as the quick check mode and measurements can be made If you want to keep this new channel setting press the enter key If the enter key is not pressed then pressing the left or MENU key will reset to the previous channel and pressing the up or down key will change to a different frequency For this procedure you will remain in the menu mode In everyday use after you have made the desired change s and pressed the enter key use the MENU key to return to the instrument operating mode Note that the display does not flash in operating mode Operating Procedures FREQ 50 000 MHz INP AGC ON DELAY 0 1 S Figure 2 5 Tuning by Frequency Input INP 1 Press the up or down key to sequence through the menu until INP is flashing The display will be similar to Figure 2 5 The first line may vary depending on the tuning selection 2 Press the enter key The input number will now flash Use the up or down key to select an input between 1 and 4 This will determine which rear panel input signal is used for the IF OUT 3 Press the enter key to accept the change Automatic Gain Control AGC 1 The AGC can be set to ON or OFF A
51. evel of 20 dBmV one channel Output Frequency RE 45 75 MHz for video carrier Rk 41 25 MHz for audio carrier 15 dB Ri From 40 25 MHz to 46 75 MHz Amplitude Response REG 0 5 dB from 35 75 to 47 25 MHz Group Delay Error REQ x 10 ns from 35 75 MHz to 47 25 Mhz Frequency Variation RE lt 20 ppm Return Loss REQ A 2 TDC5 User Manual Appendix A Performance Specification Table A 2 IF Output Cont IF Attenuator Ri Oto 15 dB in 1 dB steps Spurious Output REQ 65 dB below video carrier Table A 3 Power Requirements CATEGORY DESCRIPTION Line Voltage Ranges REQ 110 VAC 20 REG 220 VAC 20 Power Consumption REQ 60 VA maximum Line Frequency REQ 48 Hz to 62 Hz Environmental Characteristics Table A 4 Environmental Characteristics Operating Temperature REG 15 C to 35 C Storage Temperature REQ 20 C to 80 C Operating Altitude REQ 15 000 feet maximum Storage Altitude REG 50 000 feet maximum FDCS User Manual A 3 Physical Characteristics Table A 5 Physical Characteristics Dimensions REQ Height 1 75 inches 44 5 millimeters Width 19 0 inches 483 millimeters Depth 19 5 inches 496 millimeters REQ Net Weight 18 3 pounds 8 3 kilograms A 4 TDC5 User Manual Appendix B Remote Control A CAUTION Do not connect or disconnect cables while the TDCS is on Before r
52. from a power source that will not apply more than 250 Vine between the supply conductors or between either supply conductor and ground A protective ground connec tion through the grounding conductor in the power cord is essential for safe operation Grounding the Product This product is grounded through the grounding conductor of the power module power cord To avoid electrical shock plug the power cord into a properly wired receptacle before connecting to the product input or output terminals A protective ground connection by way of the grounding conductor in the power module power cord is essential for safe operation Without the protective ground connection all parts of the product are potential shock hazards This includes knobs and controls that may appear to be insulators Use the Proper Power Cord Use only the power cord and connector specified for your product Use only a power cord that is in good condition Use the Proper Fuse To avoid fire hazard use only the fuse specified for your product matched by type voltage rating and current rating Fuses are specified in Appendix C of this manual Do Not Operate Without a Cabinet To avoid personal injury do not remove covers or panels or operate this product without the protective covers installed TDC5 User Manual Safety Summary Do Not Operate in Wet Damp Conditions To avoid electric shock do not operate this product in wet or damp conditions Allow P
53. ify information in the presets Recalling a preset that has not been modified will return the current instrument operating status to the factory settings The preset command is preset only if PRESETS has been selected through the tuning command It appears as PR in the menu display and is followed by the currently selected preset number and its settings To change the preset number advance through the menu commands until PR is flashing then press enter The preset number to the right of PR will flash use the up and down keys to change to another preset between and 200 The new preset number and its settings will be displayed When the desired preset is displayed you must press the enter key to accept the new preset and change the current instrument operating status to match the preset Note that the quick check mode is not active for presets Input The input command allows you to specify which input will be used This information can also be stored in the presets for later Recall refer to the SAVE AS or PROGRAM PRESETS commands Input appears on the first line of the menu as INP followed by the input number To change the input number advance through the menu commands until INP is flashing then press the enter key The input number to the right of INP will flash use the up and down keys to change the number Press the enter key to accept the change AGC The Automatic Gain Control circuitry contains three stages two in
54. il FREQ flashes then press the enter key The frequency setting will flash the number to the right of FREQ Use the up or down key to change the frequency within the range of 50 MHz to 860 MHz A single press of the key causes a 25 kHz change and holding the key causes a continuous frequency value change in 25 KHz steps Continuing to hold the key for 7 seconds causes 1 MHz steps and for 14 seconds causes 5 MHz steps New frequencies automatically become effective after a delay of approximately 2 seconds This is referred to as the quick check mode Measurements can be made in this mode if desired However to keep the new frequency setting the enter key must be pressed Otherwise pressing the left key or MENU key will reset the frequency to the previous value and pressing the up or down key will change to a different frequency TDCS User Manual 3 3 Menu Reference After pressing the enter key you can press the MENU key to return to the instrument operating mode or remain in the menu mode and modify additional instrument parameters NOTE When the enter key is pressed the RF input is interrupted for a short period The RF input is restored at the new frequency P AE EE Channel CH 3 4 The channel command allows you to tune the signal by channel according to the channel table chosen through the tuning command This information can also be stored in the presets for later Recall refer to
55. its connected via RS485 all units must have the same baud rate The communication link between the PC and the communication box via a telephone modem can be set to another baud rate After selecting PROGRAM COMM PORT press the up or down key until the words BAUD RATE are flashing Press the enter key and TDCS User Manual 3 9 Menu Reference 3 10 the value flashes Use the up or down key to chose 1200 2400 4800 9600 or 19200 baud then press enter to register the change Address The TDCS address can be used by a connected PC to address and control the TDC5 Multiple units can be connected to one PC but each address in the remote configuration must be unique To assign an address select PROGRAM COMM PORT and press the up or down key until ADDRESS flashes Press the enter key and the hex code flashes Use the up or down key to chose an address between 00 and 3F hex then press enter to accept the address Send Test Message This command allows you to check the link between the TDC5 and the PC by sending a test message After selecting PROGRAM COMM PORT press the up or down key until MESSAGE flashes Press the enter key to send the message TDC5 User Manual Appendix A Performance Specification Performance Requirement All Performance Requirements in the specification tables are identified with REQ and can be assured by completing the Performance Check Procedure Allow a warm up time of 20 minutes Perform
56. mote Command Descriptions PWD Description Puts the TDCS in the remote state PWD Condition This command is always possible Notes Sets remote_flag and puts TDCS in the remote state PWD Condition Not a valid command DISC Description Puts the TDCS in the local state DISC Condition This command is always possible Notes Clears remote_flag and puts TDCS in the local state DISC Condition Not a valid command E 6 TDCS User Manual message bitmap message bitmap MSG Description Clears or requests the status of the TDCS The MSG command retrieves any message the TDC5 has ready to send The TDC5 can be polled continuously see page F 5 For a more detailed status report of the TDCS see the STAT command MSG Condition remote flag Trans data 1 BYTE Notes Clears the message bit s by the TRUE bits in the message byte MSG Condition This command is always possible Rec data BYTE Data message b7 Invalid remote command b6 Wrong remote parameter b5 Test message b4 Not used b3 EEPROM table empty b2 Lock state bi Erroron bus l b0 Error on bus TDC5 User Manual A TRUE state indicates TDC5 has received an invalid command TDC5 has received the wrong parameter TDC5 has sent a test message EEPROM table is empty TDC5 is out of lock A communication error has occurred on the internal 12C bus ll See the STAT command for details com
57. mproper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Table of Contents Getting Started Introduction ian nana dial rei 1 1 System Applications ooa es Ed GS ERAS 1 1 Standard Accessories 0 0 00 cc eee eee 12 Installation A IA EE Doa 1 3 Electrical Installation uro e bee wa dies pati 1 3 Changing the Mains Voltage 1 4 Rackmount Information 4 sucia bx RE en 1 5 Rack Installation Procedure 1 6 Operator s Checkout Procedure DUE 1 9 Operating Basics Functional Overview set ba wk EX OA wel Ake nese AA 2 1
58. munication Send Data Phase The data can be divided into two parts Commands and Parameters There are two types of commands SELECT and QUERY SELECT commands end with an such as PRESET They are used to send data to the FDCS m QUERY commands end with a such as PRESET They teli the TDCS to prepare data that will be received by the PC Commands can be followed by parameters Parameters are in binary format a byte can have the value of 0 to 255 If the byte 10 hex is part of the parameters this byte must be transmitted twice so that no confusion can exist with the DLE ETX at the end of the data phase Receiving Data from the TDC5 Receive Addressing Phase The PC uses Ad and Arr to address the TDCS This aborts all other communication on the same bus The TDC5 answers with a not ready phase if it has no data and a ready phase followed by a data phase if it has data The receive data phase contains Ad and Arr to be sure that the data comes from the correct TDCS Sample receive communica tion between the PC and TDCS follows with descriptions in italics The PC addresses a TDCS that has no data available PC gt DLE ENQ Ad Arr Addressing phase TDC5 gt DLE WACK Not Ready phase The PC addresses a TDCS that has data available and the TDCS returns the data PC gt DLE ENQ Ad Arr Addressing phase TDC5 gt DLE STX Ad Arr Data DLE ETX Ready phase and Data ph
59. munication error has occurred on the internal 12C bus See the STAT command for details E 7 Appendix E Remote Commands Example Command MSG Condition This command is always possible Result The following data is received in the receive cycle after sending the MSG command 36 24h 00100100b This means that the TDCS has a test message and is out of lock E 8 TDC5 User Manual Appendix E Remote Commands IDN Description Requests the TDCS identification An identification is made of the device name TDC5 followed by the version number ex VOLO A supplemental identification is given by the iit location which can be programmed by the user IDN Conditton Trans data IDN Condition Rec data Data description device version unit loc Example Command Condition Result TDC5 User Manual remote flag unit location 20 characters This command is always possible 1 CHAR 10 device TDCS If CHAR 6 version VO1 02 17 CHAROO unit loc 10 characters which define the device 6 characters which define the version number 20 characters which can be programmed by the user IDN This command is always possible The following data could be received in the receive cycle after sending the command TDC5 V01 02 01234567890123456789 E 9 Appendix E Remote Commands LOG Description Requests the remote state of th
60. nable demodulation for cable television proof of performance testing as well as operational applications such as off air pickups translators or videotaping of off air signals When used with a 1740A Series Waveform Vector Monitor or the 1780R Series Video Measurement Set the system can be used to make all of the FCC baseband proof of performance tests as well as many others such as depth of modulation and in channel frequency response TDCS User Manual 1 1 Introduction Standard Accessories The following standard accessories are shipped with the TDCS Tektronix part numbers are shown in parentheses Rackmount Hardware Kit Standard North American Power Cord 161 0216 00 10 Coaxial Cable BNC 50 Q 012 0208 00 250 V 1 Amp Replacement Fuse quantity of 2 Trim Adjustment Tool User Manual 070 8993 00 REV JUL 1994 TDC5 User Manual CS Ins A s SS SES tallation On receipt of the TDCS open the box and verify that the accessory items listed on page 1 2 are included Save the shipping carton and packing materials in case it becomes necessary to ship the TDCS to a Tektronix Service Center for service or repair Packaging instructions are on page C 1 WARNING Before proceeding read the Safety Summary at the front of this manual Electrical Installation The TDCS is designed to operate from a single phase power source having one of its current carrying conductors at or near earth ground
61. not function properly contact Tektronix about service Packaging for Shipment If it becomes necessary to ship the TDCS to a Tektronix Service Center follow these instructions 1 Write the following on a tag attached to the product the product owner complete address and phone number of someone at your firm who can be contacted the product serial number and a description of the required service 2 Repackage the product in the original packaging materials If they are not available follow these directions a Obtain a carton of corrugated cardboard having inside dimensions six or more inches greater than the dimensions of the instrument Use a shipping carton that has a test strength of at least 275 pounds b Surround the product with a protective bag antistatic preferred c Pack dunnage or urethane foam between the product and the carton If you use Styrofoam kernels overfill the box and compress by closing the lid There should be three inches of tightly packed cushioning on all sides of the instrument 3 Seal the carton with shipping tape industrial stapler or both TDCS User Manual C 1 Appendix C User Service Adjusting the Display To adjust the display be sure that power is not supplied to the TDCS Remove the top cover panel of the TDC5 and adjust Pl on the Processor and Memory board for best display Refer to Figure C 1 for location Replace the cover before operating the TDCS Interface Input
62. nue flashing until the enter key is pressed to register the change To return to the main menu press the MENU key Total Attenuation The total attenuation value represents RF attenuation IF attenua tion When AGC is off the ATTENUATION commands will be available press the up or down key until TOTAL flashes Press the enter key causing the value to the right of TOTAL attenuation to flash Use the up and down keys to choose an attenuation value between 0 and 60 dB The setting can be changed again and will continue flashing until the enter key is pressed To return to the main menu press the MENU key TDC5 User Manual Menu Reference IF Attenuation When changing IF attenuation the total attenuation typically remains constant and the RF attenuation is automatically adjusted to maintain the relationship Total attenuation IF attenuation RF attenuation If this is not possible then the total attenuation will be adjusted When AGC is off the ATTENUATION commands will be displayed press the up or down key until IF flashes Press the enter key causing the attenuation value to the right of IF to flash Use the up and down keys to choose an attenuation value between 0 and 15 dB The setting can be changed again and will continue flashing until the enter key is pressed To return to the main menu press the MENU key RF Attenuation When changing RF attenuation the total attenuation typically remains constan
63. o prevent dust and dirt from accumulating Dirt acts as a thermal insulator preventing effective heat dissipation and can also provide high resistance electrical leakage paths between conductors or components in a humid environment TDC5 User Manual C 3 A C 4 CAUTION Do not allow water to get inside any enclosed assembly or component Do not clean any plastic materials with benzene toluene xylene acetone or similar compounds because they may Exterior Cleaning Clean the dust from the outside of the instrument with a soft clean cloth or small brush A brush is especially useful for removing dust from around the buttons and connectors Hardened dirt can be removed using a soft cloth dampened with a mild detergent and water solution Abrasive cleaners should not be used Interior Cleaning Interior cleaning and maintenance should be performed by qualified service personnel only Do not clean rosin residue CAUTION A 2 RMA flux content solder is recommended for making repairs in this instrument Cleaning of rosin residue is not recom mended Most cleaning solvents tend to reactivate the rosin and spread it under components where it may cause corrosion under humid conditions The rosin residue if left alone does not exhibit these corrosive properties TDC5 User Manual Appendix Table D 1 CATV Standard Channel Table Channel Frequency Channel Frequency 2 55 25 MHz 3 61 25 MHz 4 67 25 MHz 5 77 2
64. or s Checkout Procedure on page 1 9 The TDCS menus allow you to define current instrument settings and to store and recall instrument setups through the use of presets AII settings and preset channels are saved in memory when the TDCS is turned off The following procedures use factory settings for the illustrations your display will vary if settings have been changed To assist in visualization the entire menu command structure is illustrated with a box around the two lines of text that are seen on the LCD screen No input signal is required for the following procedures Please read the Safety Summary at the front of the manual before proceeding Instrument Power On 1 Apply an appropriate power source to the TDCS and turn on the instrument power 2 The front panel LCD firmware will briefly show the Tektronix identification and firmware version number then display the instrument operating parameters The LCD display is adjustable for best viewing refer to page C 2 for instructions Enter the Menu 1 Press the MENU key to enter the menu A portion of the front panel LCD display should be flashing indicating that changes can now be made The menu display may vary depending on the current instrument settings but should be similar to Figure 2 2 You will actually see only the two lines that are boxed in the illustration and the upper left entry will be flashing TDC5 User Manual 2 5 Operating Procedures a aa aaa
65. r Manual Installation Rackmount Information The TDCS is 19 wide by 19 5 long and one rack unit high It is shipped with the hardware necessary to install it in a 19 rack Allowing Adequate Air Flow To provide adequate air flow to the cooling fins along the left and right sides of the TDCS Use the included rackmounting hardware which is designed to allow proper air flow w Install additional components such as combiners and netstrips at the back of the racks only w Allow ventilation space on the left and right sides of the equipment rack It is advisable to leave about seven inches of space at the back of a rack At the bottom and top of the rack ventilation profiles should be installed to allow air to enter and leave the rack Cooling Fans It is advisable to leave at least one rack unit of space above and below an installed unit When five or more units are installed above one another a fan is necessary Its power depends on the number of units installed For a rack containing 15 units with one unit of free space between each unit an airflow of 300 m hour is required Air Temperature When installed in a rack the TDCS should be operated in a constant room temperature of 15 to 35 C TDC5 User Manual 1 5 Installation Rack Installation Procedure Rackmounting hardware is included with each TDC5 Parts are included to accommodate racks with round square or threaded holes Refer to Figur
66. re 2 5 For channel tuning proceed to step 3 a Press the enter key the number to the right of FREQ flashes b Use the up or down key to change the frequency within the range of 50 MHz to 860 MHz A single press of the key causes a 25 kHz change and holding the key causes a continuous frequency value change in 25 kHz steps Continuing to hold the key for 7 seconds causes 1 MHz steps and for 14 seconds causes 5 MHz steps c The new frequency setting automatically becomes effective after two seconds This is referred to as the TDC5 User Manual Operating Procedures e quick check mode and measurements can be made in this mode If you want to keep this new frequency setting press the enter key If the enter key is not pressed then pressing the left or MENU key will reset to the previous frequency value and pressing the up or down key will change to a different frequency For this procedure you will remain in the menu mode In everyday use after you have made the desired change s and pressed the enter key use the MENU key to return to the instrument operating mode Note that the display does not flash in operating mode 3 For channel table tuning return to the TUNING menu and select CATV STD HRC or BROADCAST This will cause the menu to begin with CH Use the up or down key to sequence through the menu until CH is flashing The display will be similar to Figure 2 2 a b c TDCS5 Us
67. roper Ventilation Always allow air to flow freely through the cooling fins along the left and right sides of the TDCS Allow Adequate Clearance Install the TDC5 with at least 3 4 of clearance above and below its case When installing in a rack it is advisable to leave a space of one rack unit above and below the TDC5 Do Not Operate in Explosive Atmospheres To avoid explosion do not operate this product in an explosive atmosphere unless it has been specifically certified for such operation Service For internal service and adjustment of the TDCS contact your local Tektronix representative Only qualified personnel should perform service procedures TDCS User Manual vii Preface The TDCS User Manual contains information necessary for daily use Manual Overview Topics covered in this manual are as follows Getting Started includes a product description as well as installation and first time turn on procedures Operating Basics contains the functional overview which describes the front and rear panel controls and connectors and a tutorial which guides the user through basic instrument operation Reference describes menu commands and provides a menu flow chart Appendix A provides instrument specifications both electrical and mechanical Appendix B describes remote control interfaces Appendix C describes changing fuses and cleaning the product Appendix D contains the channel tables used in the TDC5
68. t and the IF attenuation is automatically adjusted to maintain the relationship Total attenuation IF attenuation RF attenuation If this is not possible then the total attenuation will be adjusted When AGC is off the ATTENUATION commands will be displayed press the up or down key until RF flashes Press the enter key causing the attenuation value to the right of RF to flash Use the up or down key to choose an attenuation value between 0 and 45 dB The value can be changed again and will continue flashing until the enter key is pressed To return to the main menu press the MENU key Save As This command saves the current instrument settings at a specified location a preset between 1 and 200 The saved settings will be restored when that preset channel is selected through the PRESETS menu command PR To save information to a preset advance through the menu until SAVE AS flashes then press the enter key The preset number wili flash Use the up and down keys to select the desired preset then TDCS User Manual 3 7 Menu Reference Tuning press the enter key to save the current settings to it Information previously stored in that preset will be overwritten The selection made here affects the way the first line of the main menu will appear Selecting FREQUENCY will cause the line to begin with FREQ Selecting PRESETS will cause it to begin with PR and selecting a channel table will cause it to begin with CH
69. the RF chain and one in the IF chain The first RF AGC circuit at the input of the unit is used for an adjustment of up to 35 dB in 5 dB steps The second RF AGC enables 10 dB in dB steps The third IF AGC covers up to 15 dB in 1 dB steps The delay IF attenuation and RF attenuation but not total attenuation can also be stored in TDC5 User Manual 3 5 Menu Reference 3 6 the presets for later recall refer to the SAVE AS or PROGRAM PRESETS command AGC appears on the second line of menu commands followed by the status ON or OFF To change the AGC status advance through the menu commands until AGC flashes then press the enter key The AGC status will then flash use the up and down keys to change the status then press the enter key to make the change effective If AGC is on the DELAY command will be displayed if AGC is OFF the ATTENUATION commands will be displayed Attenuation or delay can be changed as described in the following paragraphs Delay When AGC is on the circuits enabling 1 dB adjustment are always in action The first RF AGC circuit enabling AGC in 5 dB steps can be configured for a delayed action as follows The DELAY command is only available when AGC is on Advance until the DELAY command flashes Press the enter key this will cause the delay time to flash Use the up and down keys to choose a new delay time between 0 and 120 seconds The setting can be changed again and will conti
70. the main menu SAVE AS TUNING Figure 2 3 The TDC5 Display After Advancing to TUNING CHANNEL TABLE CATV STD Figure 2 4 The TDC5 Display After Selecting TUNING TDC5 User Manual 2 7 Operating Procedures Tune FREQ or CH 2 8 1 The tuning method you selected in the previous step affects the way the first line of the main menu will appear If you selected FREQUENCY the menu will begin with FREQ if you selected one of the channel tables it will begin with CH Selecting presets will be described later in this section NOTE When tuning the TDCS by frequency or channel a special feature allows you to make measurements quickly When you select a new frequency or channel the new setting automatically becomes effective after two seconds This is referred to as the quick check mode Measurements can be made in the quick check mode without first pressing the enter key However pressing the left key or MENU key will reset to the previous frequency or channel and pressing the up or down key will select a new frequency or channel When you are satisfied with the new frequency or channel and want to keep the setting press the enter key If you wish to return to the instrument operating mode press the MENU key now Note that the display does not flash in the operating mode 2 For frequency tuning use the up or down key to move through the menu until FREQ is flashing The display should be similar to Figu
71. umber to the right of INPUT will flash Use the up or down key to select which input 1 through 4 will be used when Preset is selected Press the enter key now AGC will flash AGC function is described on page 3 5 d Press the enter key Now ON will flash Use the up or down key to change the setting to OFF Press the enter key to accept the selection The display will look like Figure 2 8 with IF flashing e Press the enter key and the 0 will flash Use the up or down key to select the IF attenuation value that will be in effect when Preset is used Press the enter key to accept the selection RF will flash Modify the RF attenuation value in the same way as the IF value PRESET 1 50 000 MHz INPUT 1 AGC ON Figure 2 7 Preset Default Settings 2 To save current instrument settings to a preset use the up or down key to move through the menu until SAVE AS is flashing a Press the enter key If TUNING is set to PRESET the display will be similar to Figure 2 7 with the preset number flashing If TUNING is set to CH or FREQ the procedure is the same but the display will differ slightly b Use the up or down key to select a preset number between and 200 Press the enter key to store the current instrument settings at that preset Press the MENU key to return to the main menu TDCS User Manual 2 13 Operating Procedures INPUT 1 AGC OFF IF OdB RF OdB Figure 2 8 Programming a Preset
72. ve not modified 9 If desired proceed to the TUNING menu and return the instrument to the frequency or channel tuning mode then press the MENU key to exit the tuning submenu PR 1 50 000 MHz INP I AGC ON DELAY 0 s Figure 2 9 Recalling a Preset TDC5 User Manual 2 15 Operating Procedures Set Up Remote Interface PROGRAM COMM PORT The following procedure allows you to change the way the rear panel remote control interface will work 1 Use the down key to advance to PROGRAM COMM PORT Press the enter key The display will look like Figure 2 10 MESSAGES DISABLED TAPE Figure 2 10 Programming the Communications Interface 2 Use the down key to advance until ADDRESS is flashing Press the enter key and the hex code number to the right of ADDRESS will flash 3 Use the up or down key to select an address between 00 hex and 3F hex Press the enter key This will establish the address of this TDCS to be used when controlling it from a PC Be sure that each TDCS that is attached to the same PC has a unique address 4 Press the MENU key to return to the main menu 2 16 TDC5 User Manual Menu Overview The TDCS has several user definable operating parameters These are configured through the menu see Figure 3 1 Configurable items include input 1 2 3 or 4 instrument tuning method frequency channel or preset automatic gain control delay attenuation remote interface and store and rec

Tektronix 070-8993-00 User's Manual

Contents

Download Pdf Manuals

Related Search

Related Contents