HEADEND DIGITAL MODULATOR
Contents
1. GSS Grundig SAT Systems GmbH e Beuthener Str 43 e D 90471 N rnberg e hitp www gss iv2. and S41 can be selected Please note that the associated frequency shows the channel centre The centre channel frequency lies 2 75 MHz above the usual picture carrier frequency A frequency channel table can be found at the end of this user manaul 3 Use the or key to select the desired output channel Adjusting the frequency offset Attention cases as it requires all TV sets which are connected to the cable system to match this setting by effecting a corresponding fine tuning correction Press the B key until Fine 0 appears also in the display Then use the or key to select a different Fine setting Press the lt 4 key to return to the output channel The service menu Press the MODE key The OUTPUT LEVEL CONTROL menu appears in the display Note A power equivalent RF carrier is generated on the picture carrier of the respective channel With that it is possible to adjust the level of the box with any commercial measuring receiver tuned to the picture carrier frequency of the respective channel To prevent interferences inside the Headend station and the cable system the output level of digital boxes must be cut by about 8 dB with respect to analog TV channels The following example gives detailled information on what is to be observed and how to proceed Example Connect a commercial analog TV measuring receiver to the RF output socket AUSGANG x of the Headend station Meas
3. correct the input frequency until the frequency offset BD becomes less than 1 MHz f 12050 Note If a question mark appears in the second menu row no input signal q pp pur sig Bx 1A has been found In this case check the overall configuration of the satellite f 12050 system and of the Headend station as well as the previous settings of the transmodulator box concerned Adjusting the QAM modulation value 1 Press the MODE key The QAM MODEK menu appears in the display In the second menu row the associated output symbol rate e g Sue Enz 6875 Kilosymbols sec is indcated Bx 1A QAM MODE Attention For the manual channel search on a connected digital cable receiver this must also be set to this value e g gt 6875 Kilosymbols sec Note Normally 64 QAM are transmitted on the cable system If a question mark appears in the second menu row the transmodulator box is unable to generate an output signal In this case check the overall configuration of the satellite system and of the Headend station as well as the previous settings of the transmodulator box concerned QAM MODE SR Attention The box can only generate a maximum symbol rate of 7000 Kilosymbols sec GAM MODE A very high input symbol rate can cause an output symbol rate of gt 7000 Kilosymbols sec In this case Error appears in the second menu row Error The box then must be adjusted to a higher QAM mode val
4. the transmodulator box HDM 384 on this box the output channels 21 to S41 can be selected Selecting the box number and the channel line A or B ER 1 The access menu e g Bx 1A TWIN QAM appears in the display x 1A 521 541 2 Use the or key to select the desired box number and the channel line A or B Adjusting the output levels of the channel lines A and B to each other Note The following adjustment is only necessary if the output level of the two channel lines A and B of one box differs by gt 1dB 1 Press the MULTI key The Bx 1A or Bx 1B LEVEL HF OUT menu for Bx 1A TWIN QAM e example appears in the display LEVEL HF OUT D Note Check the output level of the channel lines A and B 2 Using the key adjust the higher output level of the respective channel line A or B to the lower output level of the other channel line in steps from 0 to 7 dB Selecting the LNB frequency 1 Press the MODE key The LNB Freq menu appears in the display Bx 1A LNB Freg f 10600MHz 2 Use the or key to select the correct LNB frequency SETUP OUTPUT 306 00 OUTPUT 306 00 OUTPUT Fine O Bx 1A OUTPUT LEVEL CONTROL Selecting the output channel Press the MODE key The OUTPUT menu appears in the display 2 Call up the preset output channels of the box by pressing the MULTI key repeatedly Note The channels between S21
5. 3 25 Continued on next page SERVICE Kanal Frequenztabelle Band IV V CCIR Channel Frequency Table Band IV V CCIR Kanal Frequenz Kanalmitte in MHz Frequenz Bildtr ger in MHz Channel Channel centre frequency in MHz Picture carrier frequency in MHz C21 474 00 471 25 C 22 482 00 479 25 C 23 490 00 487 25 C24 498 00 495 25 C25 506 00 503 25 C 26 514 00 511 25 C27 522 00 519 25 C 28 530 00 527 25 C29 538 00 535 25 C 30 546 00 543 25 C31 554 00 551 25 C 32 562 00 559 25 C 33 570 00 567 25 C 34 578 00 575 25 C 35 586 00 583 25 C 36 594 00 591 25 C 37 602 00 599 25 C 38 610 00 607 25 C39 618 00 615 25 C 40 626 00 623 25 CAl 634 00 631 25 C 42 642 00 639 25 C43 650 00 647 25 C 44 658 00 655 25 C 45 666 00 663 25 C 46 674 00 671 25 C47 682 00 679 25 C 48 690 00 687 25 C 49 698 00 695 25 C 50 706 00 703 25 Ch 714 00 711 25 C 52 722 00 719 25 C 53 730 00 727 25 C 54 738 00 735 25 CH 746 00 743 25 C 56 754 00 751 25 C 57 762 00 759 25 C 58 770 00 767 25 C 59 778 00 775 25 C60 786 00 783 25 Col 794 00 791 25 C 62 802 00 799 25 C63 810 00 807 25 C 64 818 00 815 25 C65 826 00 823 25 C 66 834 00 831 25 C 67 842 00 839 25 C 68 850 00 847 25 C 69 858 00 855 25
6. AM Cut output level of TWIN QAM boxes 521 541 521 LEVEL HF OUT D channel line Aor B 0 to 7 dB MODE Bx 1A LNB Freg f 10600 MHz MODE Bx 1A OUTPUT AUSGANGSKAN LE A B s21 306 00 OUTPUT CHANNELS A B MULTI MULTI Bx 1A OUTPUT Bx 1A OUTPUT Bx 1A OUTPUT LEVEL CONTROL Modulator on RANDOM 6875 kBd Modulator off on Bx 1A OUTPUT spectrum SPECTRUM normal normal inverse MODE Continued on next page THE MENU CUIDE continued dp select 4 SR FEC change setting enter input frequency adjust QAM value MODE gt 2 sec reset all settings M save all settings back to access menu SETUP Setting up the transmodulator box The transmodulator box is set up exclusivley via the keyboard of the basic BE Plus module carrier s control unit The user is guided by means of the two line display on the control unit please wait 1 You may select the following menu items with the MODE key sd ex Box number and channel line adjust output level of channel line A or B DE BOX SELECT MENU SELECT en MODE BUTTON LNB frequency MODE OUTPUT KE Output channel frequency offset MODULATOR OUTPUT MENU RESET a e CHANNELS MODE BUTTON Service settings PRESS 2 SEC Me Symbol rate FEC Input frequency transponder frequency QAM modulation value Note The following examples show the setup of
7. Grundig SAT Systems HEADEND DIGITAL MODULATOR HDM 384 TWIN HDM 385 TWIN CONTENTS General Scope of delivery Technical data The DVB twin transmodulator boxes QPSK QAM HDM 384 and HDM 385 Installation Installing the transmodulator box into the Headend station and connecting it The Menu Guide The menu guide at a glance Setup Setting up the transmodulator box Adjusting the output levels of the channel lines A and B to each other LNB frequency Output channel Frequency offset Service settings Example Symbol rate Input frequency transponder frequency QAM modulation value Saving all settings Explanation of the Symbol rate term Service at the end of this user manual Channel frequency tables GENERAL Scope of delivery 1 DVB twin transmodulator box HDM 384 or HDM 385 2 RF connecting cables 1 user manual 1 supplement leaflet Premiere World Technical data RF input Frequency range Frequency spacing Level range IF bandwidth Symbol rate RF output HDM 384 Channels Frequency range Channel norm HDM 385 Channels Frequency range Channel norm Output level Output impedance Frequency detuning of the output signal Connectors SAT input RF output modulator 10 pin connector This product conforms with the requirements of the 73 23 EC and 89 336 EC guidelines of the European Council The standards EN 50083 2 EN 50083 2 A1 EN 50083 1 an
8. d EN 60065 required for the CE certification are kept to 950 2150 MHz 1 MHz 35 dBpV 80 dBpV 36 MHz 1 30 Msymb sec MCPC SCPC 321 341 306 00 MHz 466 00 MHz centre channel frequencies PAL CCIR Standard B G C21 C69 474 00 MHz 858 00 MHz centre channel frequencies PAL CCIR Standard G typ 90 dBpV 75 Ohm nominal 4 00 MHz in 125 kHz steps 2 F sockets screw terminals 1 IEC socket female for all supply voltages and the 12C bus Subject to technical modifications and errors w ENGLISH GENERAL The DVB twin transmodulator boxes QPSK QAM HDM 384 and HDM 385 These twin transmodulator boxes are QPSK QAM modulators which convert QPSK modulated signals from a satellite into a QAM2 modulated cable signal for being distributed via a cable system These modulation procedures are layed down by international standards for the transmission medium QPSK satellite signal path QAM cable and use in an optimum way the available bandwidth 1 QPSK Quadrature Phase Shift Keying 2 QAM Quadrature Amplitude Modulation QPSK 4 QAM The cassettes can be operated in the following GRUNDIG headend stations STC 316 STC 332 and STC 1200 Each twin box has two SAT inputs and 1 RF output Each box has two channel lines channel lines A and B One channel line consists of a digital SAT tuner the digital signal processors and an analog converter The two channel lines of a transmodulato
9. e MODE key The INPUT menu appears in the display Note The symbol rates SR of satellite transponders can be found in current tranponder tables or in various satellite magazines Use the 4 key to select SR Then use the or key to set the appropriate value FEC Forward Error Correction standardized error protection system for digital TV broadcasts FEC auf automatic FEC Note FEC values can be found in the actual channel tables of the satellite operators If no reception is possible even after entering all parameters it is also possible to enter the FEC value manually Use the key to select FEC and then repeatedly press the or key until the picture sound signal of the desired satellite channel appears on the picture screen In the second menu row appear one after the other FEC aut FEC 1 2 FEC 2 3 FEC 3 4 FEC 5 6 FEC 7 8 and then FEC aut again SETUP Selecting the input frequency transponder frequency 1 Press the MODE key The INPUT menu appears in the display Bx 1A f 12050 2 Use the or key to set the input frequency Note IF three dots e e appear in the second menu row the box is in channel search mode please wait When the RF reception unit has synchronized with the input signal a possible frequency offset with regard to the desired frequency in MHz e g 1 8 Bx 1A f 12050 is indicated 3 Using the or key
10. e fitting or replacing a cassette it is absolutely necessary to disconnect the mains plug from the headend station 1 Undo the fixing screws of the mounting frame then fit the cassette into a free slot and refit the fixing screws 2 Plug the HF input cables into the HF input sockets SAT INPUT A channel line A and SAT INPUT B channel line B see Figure 3 Reconnect the headend station to the mains supply The cassette is now connected with all necessary supply voltages and data lines and ready for use v ENGLISH MODE AUDIO MAIN SUB STEREO THE MENU GUIDE MODE BUTTON PRESS 2 SEC ON select box number and channel line A B enter LNB frequency select output channel channel centre gt gt 2 sec fine offset d back MULTI select Note You may select the individual menus or menu items by pressing the MODE key To go back to the access menu without saving the settings made press the MODE key longer than 2 seconds When in a menu use the 4 and B keys to select the desired setting and then the and keys to change the settings Press the M key to save all settings and to return to the access menu The following examples show the setup of the transmodulator box HDM 384 on this box the output channels 21 to S41 can be selected V 21 BE Remote V 21 Software version of the please wait Headend station s control unit ca 10 Sec Bx 1A TWIN QAM Bx 1A TWIN G
11. modulation degree and thus the number of bits per second is increased the symbol rate decreases for a given useful bit rate Below you find formulas for the calculation of the output symbol rate SR A for a given input signal rate SR Ela and FEC a Note If no FEC is given in the programme tables an FEC 3 4 can be assumed 256 QAM SR A FEC x 1 4 x SR E 128 QAM SR A FEC x 2 7 x SR E 64 QAM SR A FEC x 1 3 x SR E 32 QAM SR A FEC x 2 5 x SR E 16 QAM SR A FEC x 1 2 x SR E A QAM SR A FEC x 1 1 x SR E Example Output symbol rate 64 QAM Input symbol rate SR E at 27500 Kilosymbols sec FEC 3 4 SR A FEC 3 4 x 1 3 x SR E 27500 Kilosymbols sec 6875 Kilosymbols sec SERVICE Kanal Frequenztabelle Hyperband Channel Frequency Table Hyperband Kanal Frequenz Kanalmitte in MHz Frequenz Bildtr ger in MHz Channel Channel centre frequency in MHz Picture carrier frequency in MHz 21 306 00 303 25 S 22 314 00 311 25 S 23 322 00 319 25 S 24 330 00 327 25 S25 338 00 335 25 S 26 346 00 343 25 S 27 354 00 351 25 S 28 362 00 359 25 S 29 370 00 367 25 S 30 378 00 375 25 S31 386 00 383 25 592 394 00 391 25 S 33 402 00 399 25 S 34 410 00 407 25 S 35 418 00 415 25 S 36 426 00 423 25 S 37 434 00 431 25 S 38 442 00 439 25 S 39 450 00 447 25 S 40 458 00 455 25 S41 466 00 46
12. r box are indicated as Box A and Box B in the display of the control unit The two input signals are processed according to the box specifications and then passed via the RF output socket to the RF output collector of the basic module carrier The common output level channel lines A and B of the box can be adjusted using the mechanic level control max 20 dB on the RF output collector of the Headend station After switching the headend station on the software version of the control unit is briefly shown in the 2 line LC display About 5 minutes after the last key is pressed the display is automatically switched off or the software version of the control unit is displayed Note Please observe that when equipping existing headend stations with new cassettes it might be necessary to update the software of the control unit or to exchange the control unit This cassette requires a control unit with the following software version 21 or higher If desired the software version can be called up and displayed manually in the access menu 1 Press and hold down two buttons on the control unit at the same time for example the and button until the following occurs The display turns dark After about 5 seconds appears the software version e g 21 INSTALLATION GRUNDIG SAT INPUT B SAT INPUT A Installing the transmodulator box into the basic module carrier and connecting it Caution Befor
13. ue 128 or 256 in order to adjust the output symbol rate to the admissible value of lt 7000 Kilosymbols sec An output symbol rate of above 64 QAM results in very high demands on the cable network Due to noise runtime and frequency response problems reception of the converted output signal may become impossible However it may be expected that all satellite transponders will operate in the future with symbol rates allowing an output symbol rate of 64 QAM Continued on next page ENGLISH 12 Bx 1A 821 841 SETUP Attention Too low input symbol rates may also cause problems Certain digital satellite receivers set top boxes allow only for a minimum specific symbol or the digital box limits this range to 1000 Kilosymbols sec If you note when setting 64 QAM that the resulting symbol rate is too low for certain set top boxes or the transmodulator box you must set a lower QAM ideal is 16 QAM The resulting symbol rate then lies in the admissible range again Saving all settings 1 Press the M key to save all new settings The access menu e g Bx TA TWIN QAM reappears in the display Explanation of the Symbol rate term High value modulation modes such as QPSK or QAM allow for the encryption of several bits by means of a single physically transmittable and receivable symbol The useful data flow contains the picture sound signal of one satellite transpon der and is therefore fixed If the
14. ure the output level of an analog box and then adjust it to a common output level e g 100 dBpV Adjust the TV measuring receiver to the selected output channel e g S 21 of the digital box Continued on next page ENGLISH SETUP Bx 1A OUTPUT Modulator on Bx 1A RANDOM OUTPUT 6875 kBd Bx 1A OUTPUT normal Spectrum Bx 1A INPUT FEC aut SR 27500 Bx 1A INPUT FEC aut SR 27500 10 Check the output level of the digital digital Twin QAM box output level of the box by about 8 dB 92 dByV Note Cutting of the output level effects both channel lines A and B of the digital Twin QAM box Press the MULTI key The OUTPUT control unifs display Modulator menu appears in the Use the or key to switch the respective modulator Output channel off or on again Press the MULTI key The OUTPUT RANDOM menu for service functions appears in the control unit s display In the second menu row the associated output symbol rate e g 6875 kBd 6875 Kilosymbols sec is indicated Press the MULTI key once again The OUTPUT appears in the display Spectrum submenu Note The spectrum of the useful signal can be inversed An inversion is only necessary in exceptional cases and for certain older digital cable receivers Using the or key select the inverse or normal spectrum setting Adjusting the symbol rate SR Press th
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