Kenwood TR-7400A User's Manual
Contents
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3. 05 146 2 L79 0421 05 151 4 L79 0422 05 156 7 L79 0423 05 Table 1 Tone Squelch Active Filter List Bottom side Fig 8 How to Install the Tone Unit NOTE Split the supplied PC board into two sections as shown in Fig 9 You now have two separate tone squelch boards for ease in changing tone fre quencies Some tone squelch circuits have an appreciable time lag The active filter circuit employed in the TR 7400A however features comparably short time lag The SQU Control 9 has no effect when the TONE Selector Switch is at SOU OFF BUR SUB Sets your transceiver in the normal carrier type squelch mode of reception with the SQU Control 9 turned clockwise generally to the noise thresh old Sets your transceiver to the carrier type squelch mode of reception as with the OFF position In the transmit mode of operation your trans ceiver superimposes an additional tone burst signal when tone burst access is desired The tone burst signal is generated for about 0 5 seconds when a tone oscillator module option is plugged into the monofork socket on the TX unit X56 1230 10 and the microphone push to talk switch is depress ed for transmit as illustrated in Fig 10 For example if you make use of a repeater station which receives a 146 34 MHz incoming signal transmits a 146 94 MHz signal and uses a 1 800 Hz tone burst access install an 1 800 Hz tone burst module into the TX unit as illustrated in Fig 10 S
4. PAD Connector 1 The POWER ON Switch 1 is depressed and released 2 The MHz 100 kHz and 10 kHz Selector Switches 9 19 are turned or the 5 kHz Offset Switch de pressed 3 The microphone button is depressed or released when the TX OFFSET Switch 12 is positioned at 600 or 600 for repeater operation 4 The TX OFFSET Switch 07 is shifted to 600 or 600 during transmit Touch tone 4 7 HOW TO USE THE TONE PAD TONE PAD plug The TR 7400A has a tone pad input for Auto patch operation If you use a tone pad on the market connect the b Connection of Touch Tone supplied miniature plug from your tone pad 12 If your transceiver fails to work contact the authorized dealer from which you purchased it for quick reliable repair All adjustable trimmers and coils in your transceiver were preset at ihe factory and should only be readjusted by a qualified technician with proper test equipment HOW THE TX FINAL TRANSISTORS ARE PROTECTED The TX unit final transistor protection provided in the TR 7400A is done by sampling the reflected power As the AA AS STA AS EA A AA AA A SAA A A ATA ESA ASES OATES SECTION 5 ADDITIONAL INFORMATION A E AA A SA ATA AA A A AAA A OA AA AA AA AE AAA A ANAIS AT reflected power is increased higher SWR the voltage to the driver transistors is reduced If the transmit signal does not reach an expected distant point check the antenna system That is whether the ante
5. final tran sistors ANT Connector For connection of any 50 ohm 2 meter antenna 2 3 SIDE PANEL 20 22 2 EXT SP Connector External AF output 8 ohm TONE PAD Connector A tone pad input for Auto patch operation 600 ohm Refer to Section 4 7 the HOW TO USE THE TONE PAD on page 12 Mounting Rail Used to install the transceiver on the supplied mounting bracket Snap Lock Used to lock the transceiver body on the supplied mounting bracket Stand off Can be attached to your TR 7400A during operation to provide a convenient angle of viewing for the operator AS ASA CEU NADA UED ETIDS RED ONE SECTION 3 GENERAL TIPS ON INSTALLATION EUREN 3 1 MOBILE USE 1 Installation Position Your TR 7400A may be installed under the dashboard of your vehicle for convenient operation Be sure that its posi tion does not restrict your leg movement to the brake pedal A typical installation is shown in Fig 4 2 How to Install Fig 5 IMPORTANT The TR 7400A is designed for a negative ground installation a Securely install the mounting bracket with the suppli ed bolts and nuts b Insert the transceiver into the mounting bracket using the mounting rails c Adjust the rail angle for the desired position of the transceiver This assures operational convenience and safety while driving the vehicle d Unfold each snap lock hook on the pawl then clamp the snap lock Both locks sho
6. AA AS AA A AA AAA ATA AAA ATA AAA nE TOP BOTTOM VIEW OF THE TR 7400A ET ett SS Le AAA AA RT ARSS TA AAA LOS DISPLAY UNIT PD UNIT TX UNIT RF ter ADJ X54 1210 10 X50 1380 10 X56 1230 10 NE Y sm 5V AVR Tone burst time ADJ Tone oscillator module PA UNIT option X45 1090 10 VCO UNIT RX UNIT X50 1370 10 X55 1150 10 Center meter point S meter ADJ E S z ea TONE UNIT Protection ADJ option S SWITCH BOARD Tone dev ADJ Herical resonator KENWOOD A product of TRIO KENWOOD CORPORATION 6 17 3 ehome Aobadai Meguro ku Tokyo 153 Japan O 8473 PRINTED IN JAPAN B50 2515 00 T
7. INTRODUCTION Your KENWOOD Model TR 7400A is a high quality 2 meter transceiver for use in ama teur radio mobile stations as well as fixed stations It contains a PLL frequency syn thesizer developed and engineered through KENWOOD s elaborate VHF technology to provide high performance and outstanding technical characteristics The TR 7400A is capable of transmitting or receiving F3 FM signals on up to 800 Chan nels at intervals of 5 kHz having 25W RF output power CONTENTS SPECIFICATIONS 3 SECTION 1 PREPARATION FOR USE 4 1 1 Accessories 1 2 Tone Squelch 1 3 Antenna 1 4 Installation Caution SECTION 2 CONTROLS AND WHAT THEY DO 4 2 1 Front Panel 2 2 Rear Panel 2 3 Side Panel SECTION 3 GENERAL TIPS ON INSTALLATION 7 3 1 Mobile Use 3 2 Fixed Station Use SECTION 4 OPERATION renra 8 4 1 Receiving 4 2 Transmitting 4 3 How to Use the TX Offset Switch 4 4 How to Use the Hi Low Selector Switch 4 5 How to Use the Tone Selector Switch 4 6 Description of Unlock Indicator 4 7 How to Use the Tone Pad SECTION 5 ADDITIONAL INFORMATION 12 BLOCK DIAGRAM 13 TOP BOTTOM VIEW OF THE TR 7400A 14 SCHEMATIC DIAGRAM 1 eee ee ee ees 15 TTT AS AAA SAS TR 7400A SPECIFICATIONS GENERAL Semiconductors Frequency Range Frequency Synthesizer Synthesizer Stability Mode No of Channel Operating Temperature Power Volt
8. KA wiogav 3 66p Y 49 01 061 1 S5X LINA XH 14 OS ITT IR DIS TR 7400 SAITO X54 1210 10 x1O0MHz D1 x1OMHz T xMHz x100kHz D4 1 IC1 3 SN7447AN D1 6 TLR 313 x1OkHz I xkHz R6 470x4 b C d e f 92 470 0 VRT Se a by0 d e f g nn PD1 8W Type Q71 2SC1000 6R D71 74 181555 WW LEITET II A AA ATEO SCHEMATIC C ASS ST SAS AU LIS Q1 35K41 L or 03 417 410 25C VRIO2 Skip R78 560 Ac Ti For Tone SQ ites 1 1 I l LI asaj C72 10 16V En r r Ar Bom AY C51 10 16V it 5 2 L D on e 0 Ri2 1k R13 220 Po7 33n s lt 1 d cas 47 10Y R39 680 L Bur T ADJ C73 15P ST I 101 TONE SW HDD OIHDSOUD GHD IC DIAGRAM la La LL JL A TIIN SK41 L or 3SK40 L Q2 3SK41 L M Depag Timo Taak e REES R2 TBk C25 470p R29270k C38 220p_R38 100k S METERADJJ us ou OS SFE IO 7MAS Q4 en cao Q9 c43 pe WI L n e W a SZ Ar e Va al ox 48 1 5k 470p re Sa s 5 em 212 sigh ERE o STET ler se Aert lo We AO s 8 METER lr a al fica ie de 9 a R i d u gt Rasik ak ee a 3 s 8 sl 2 SIS S 2 w E Teto Er 8 e Im EL m amp a R114 un gt ale l Z o Ark erst unse GE Se 3 Sial d q Es 8 O fi OT css 39 Cen 1 50V 8 S E 33p RIZO Seins gel 9 Ed d ES 8 E al Rts BS 31118 Ss LN E Pe SEL an a 100 O Dim en 3 o es ots t a 8 Rao Le 086 72
9. X OFFSET Fig 7 Layout of the Two Meter Band 4 4 HOW TO USE THE HI LOW SELECTOR SWITCH Occasionally it is desirable to lower the RF transmit power to reduce battery drain or drive an external amplifier Depressing the HI LOW Selector Switch to LOW will reduce the RF transmit power from 25W to 5W which is read as 3 approximately on the Meter 5 4 5 HOW TO USE THE TONE SELECTOR SWITCH The TONE Selector Switch 3 has four positions SQU Sets your transceiver to the tone squelch mode of reception with the Tone Squelch Indicator lit red The tone squelch circuit built into the TR 74004 called the CTCS continuous tone con trolled squelch is operated by the tone signal of a specific frequency that has been superimposed with the your voice signal onto the carrier in the TX unit and is separated in the RX unit You may select any desired tone frequency by choosing one of the tone squelch active filters listed as options available for the TR 7400A in Table 1 Figure 9 shows installation of the tone squeich active filter on the PC board supplied with your TR 7400A Figure 8 shows installation of the PC board in the RX unit X55 1150 10 Frequency Hz Parts number 88 5 L79 0408 05 94 8 L 79 0409 05 100 0 L79 0410 05 103 5 L79 041 1 05 107 2 L79 0412 05 110 9 L79 0413 05 114 8 L79 0414 05 118 8 L79 0415 05 123 0 L79 0416 05 127 3 L79 0417 05 131 8 L79 0418 05 136 5 L79 0419 05 141 3 L79 0420
10. age Grounding Antenna Impedance DC Current Dimension Weight TRANSMIT SECTION RF Output Power Modulation Max Frequency Deviation Spurious Radiation Touch Tone Input Impedance Microphone RECEIVE SECTION Circuitry Intermediate Frequency Sensitivity Squelch Sensitivity Pass Band Width Selectivity 2 Signal Image Rejection Spurious Interference Intermodulation Audio Output OPTION i Tone Squelch Tone Deviation Encorder Response Frequency Stability Tone Squelch Open Sensitivity Tone Distortion ii Tone Burst Burst Time ITT TTT TTT TTT E TTT ET TT TITTEN RUND Transistors 58 FETs 8 ICs 19 Diodes 63 144 00 to 147 995 MHz Digital TTL Logic control of phase locked VCO Less than 750 Hz at 25 C FM 800 20 to 50 C 11 5 VDC to 16 0 VDC 13 8 VDC as reference Negative grounding 50 2 Less than 1A in receive with no input signal Less than 8A in transmit HI Less than 4 5A in transmit LOW at 13 8 VDC 182mm 7 3 16 wide 74 mm 2 7 8 high 270 mm 10 5 8 deep Approx 2 8 kg 6 2 Ibs High 25 watts min Low approx 5 watts adjustable up to 15 watts Variable reactance direct shift 5 kHz Less than 60 dB 600 2 Dynamic microphone with PTT switch 500 Q Double superheterodyne ist IF 10 7 MHz 2nd IF 455 kHz Less than 0 4 uV for 20 dB quieting Less than 1 uV for 30 dB S N Less than 0 25 uV More than 12 kHz at 6 dB down More than 72 dB at 30 kHz of adjacent ch
11. annel More than 70 dB More than 60 dB More than 66 dB More than 1 5 watts across 8 Q load 10 distortion 0 5 kHz adjusted Less than 0 5 sec Less than 1 Less than SINAD 10 dB Less than 5 Approx 0 5 sec adjusted NOTE The circuit and ratings may change without notice due to development in technology SECTION 1 PREPARATION FOR USE EOS SAA SEA ASA AUS A AS EA AS LAA EAST STA ET LA ALA A ES AA A AUT LET URL ESTA ATA AA A AAA AA AAA A AAA A AAA E EE 1 1 ACCESSORIES Carefully unpack your TR 7400A Transceiver and check that it is supplied with the following accessories 1 Dynamic microphone equipped with Apin plag ari a de 1 piece 2 Mounting bracket o o ooooo o 1 piece 3 Mounting parts Screws 6 mm diameter 4 pieces Plain washers 6 mm diameter 4 pieces Spring washers 6 mm diameter 4 pieces Nuts 6 mm diameter 4 pieces 4 Stand off bracket 1 piece 5 babel a ee aan 1 sheet 6 Spare fuse IDA 1 piece 7 DC power cord with plug and fuse 1 piece 8 Miniature plug for external speaker 1 piece 9 Miniature plug for touch tone pad 1 piece 10 Plug equipped PC board for tonesque lChy a mee ion a ra a 1 sheet 11 Operating manual 1 copy 1 2 TONE SQUELCH The TR 7400A is designed not only for normal carrier type OO O O 00 squeich operation but also for tone
12. cted properly 2 Depress the POWER ON Switch 1 The digital fre quency Display 8 will indicate the frequency and the meter 5 will be illuminated 3 Set the TONE Selector Switch to OFF 4 Turn the SOU Control fully counterclockwise 5 Turn the VOL Control clockwise until the noise comes up to a comfortable level 6 Set the MHz 100 kHz and 10 kHz Selector Switches 12 3 and 5 kHz Offset Switch 3 to the receive frequency If an incoming signal is received the Meter S will indicate the signal strength 7 To eliminate the noise heard with no input signal grad ually turn the SOU Control 9 clockwise until the noise threshold is reached 3 2 FIXED STATION USE If you operate the TR 7400A as a fixed station attach the supplied Stand off bracket 25 to it as illustrated in Fig 6 The TR 7400A is designed so as to be used with a DC power supply having a current capacity of around 10A at the rated operating voltage of 13 8V Fig 6 Use of Stand off Bracket NOTE Your transceiver is normal even if the Unlock Indicator 6 located on the center of the front panel lights momentarily after selecting a frequency For more detailed information refer to Section 4 6 the DESCRIPTION OF UNLOCK INDICATOR page 12 4 2 TRANSMITTING 1 Plug the supplied microphone cable plug into the MIC Connector OD 2 Set the TONE Selector Switch to OFF Set the TX OFFSET Switch 7 to SIMP 4 Set the MHz 100 kHz and 10 kH
13. dicated 146 00MHz 146 010MHz 146 400 MHz FM REPEATER 147 00MHz 146 610MHz FM REPEATER FM REPEATER 600 Your Transceiver can be used for repeater opera tion The Repeater indicator will light green The RF receive frequency is the same as indicat ed on the Digital Frequency Display but the RF transmit frequency is 600 kHz lower than indicated NOTE The TONE Selector Switch 8 can also be used for repeater operation Please refer to Section 4 5 the HOW TO USE THE TONE SELECTOR SWITCH BUR position page 10 CAUTION 1 The TX OFFSET Switch 7 as described above shifts 600 kHz higher or lower only the RF transmit frequency of your Transceiver irrespective of the posi tions of the MHz 100 kHz and 10 kHz Selector Switches 2 3 4 and 5 kHz Offset Switch 5 leaving the RF receive frequency as displayed In general repeater operation is done by setting the TX OFFSET Switch 7 to 600 for the Frequency range of 147 000 to 147 390 MHz and to 600 for 146 610 to 147 000 MHz see Fig 7 2 In using the TX OFFSET Switch 7 particular care should be observed not to transmit out of the fre quency band of 144 to 148 MHz 148 00MHz 147 39 0MHz 147 600MHz 147 990 MHz FM REPEATER OUTPUT Yu EE EEE OUTPUT INPUT AY TR 7400A TR 7400A TR 7400A TR 7400A TRANSMIT RECEIVE RECEIVE TRANSMIT FREQUENCY FREQUENCY FREQUENCY FREQUENCY lt RANGE RANGE x RANGE RANGE Ir TX OFFSET T
14. econd set the TX OFFSET Switch 4 to 600 Then you can operate through this repeat er You may select any desired tone burst fre quency from those listed as options available for the TR 7400A in Table 2 Sets your transceiver to the carrier type squelch mode of reception as with the OFF position In the transmit mode of operation a subaudible tone is superimposed on your RF output signal The tone frequency is determined by the tone squelch active filter installed in the RX unit X55 1150 10 See Fig 8 Fig 9 How to Use the Supplied PC Board Frequency Hz Parts number 1 800 TBM 1800 1 950 TBM 1950 2 000 TBM 2000 2 100 TBM 2100 2 150 TBM 2150 2 200 TBM 2200 2 250 TBM 2250 2 400 TBM 2400 2 550 TBM 2550 Table 2 Tone Burst Oscillator Module List 11 Top side Tim L L Fig 10 How to Install the Tone Oscillator Module 4 6 DESCRIPTION OF UNLOCK INDICATOR The TR 7400A has a protection circuit which prevents it from radiating undesirable signals should the phase locked loop PLL which is employed for the frequency synthesis Seen from the cord be unlocked If the protection circuit operates the Unlock Indicator located at the center of the front panel lights red and stops the local oscillator thus shutting the TR 7400A receive and transmit operation down However you should note that the PLL will work normally even if the Unlock Indicator lights red momentarily in the following cases a TONE
15. lector Switch Used to select the desired band 144 145 146 147 MHz indicated as 4 5 6 and 7 respectively 100 kHz Selector Switch Used to select a desired channel in units of 100 kHz graduated in 11 positions O through 9 and O 10 kHz Selector Switch Used to select a desired channel in units of 10 kHz graduated in 11 positions 0 through 9 and 0 5 kHz Offset Switch Used to select the least signifi cant digit 0 or 5 kHz of the channel frequency Unlock Indicator Refer to Section 4 6 the DESCRIP TION OF UNLOCK INDICATOR page 12 A light emitting diode indicates when the PLL circuit is in the unlock condition There is no synthesizer output in the unlock condition Note however that the PLL circuit is norma if the indicator lights momentarily when a channel selector switch is changed TX OFFSET Switch Refer to Section 4 3 the HOW TO USE THE TX OFFSET SWITCH page 9 This switch selects the type of frequency offset desired 600 kHz switches the transmit frequency UP 600 kHz from the receive frequency SIMP stands for simplex operation The receive and transmit frequencies are the game 600 kHz automatically switches the trans mit frequency down 600 kHz from the receive frequency 2 2 REAR PANEL E 20 DC Power Connector Accepts normal DC operating voltage through the DC power cord supplied with the TR 7400A Heat Sink Radiates heat produced by the
16. n na and coaxial cable is well connected or not If it is open or the SWR is infinite the transmit signal is on the air but the protection circuit operates such that the driver transistor collector voltage is lowered to decr ase the level of the signal input to the final transistors which in turn reduces collector loss thus protecting the final transistors 13 DvoorL Al Be on a WS ee a NG we eos TT TT siwa HOI OBEL 0SX sevvsz EL s6vedi 0076041 L I LINN ad 911 91 1 zi oso sau I leo 249091 ZHINQG Z T 090 ax Il xy XL M piwal DIPSOL yopedL 91907 135440 XL oztea XZ6ISTPLNS 986 1 ZES 1 N CIAIG eee ee Es x an 099952 099SZ 099952 4308 dg 338 ZHINQE 6 8 6 967052 gt gt A6 662 007 098 GHYOS HOLIMS ZHWNG I tr et ZHNW88t9 ZF 00 01 02 1 08X LINN ODA o i 01 0121 FSX LINN AWIASIO TWNOILdO EI EN ry I ABEL em 01 DIZI PSX LINN AV1dSIG Ls o E a unt F IXEIE AIL GEELEN Loc EE 4 Ham MS 3MOd 01 0601 SpX LINN Vd 83 a98 890193735 Eee TINNVHO I XL 4 4 BLOCK DIAGRAM ITT TTT TTT ICI UD IO TTT TTT ITT 96979052 8579052 LA wm R es pn mmm aman awara Yay any OO HOLIMS 009 F H Sasa ee en Sapa ds A AA 01 08Z1 95X LINN XL 01 08E1 06X LINN Ad E J yo07Nn I 01 0281 0SX LINN ODA ei 869052 any UM UI A AE DAI DAD TRUITT TT TTT ID TIR TOT HE SIA 213 371 40
17. squelch which operates with the installation of the optional tone module If you operate the TR 7400A setting tone selector SQU without the module you will it not to be in the normal receive mode Detail is shown in page 10 1 3 ANTENNA Any 50 ohm 2 meter antenna system may be used with your TR 7400A The 50 ohm coaxial cable should be kept as short as possible in order to minimize line loss Attach a UHF type connector PL 259 to the coaxial cable for easy connection to the receptable on the transceiver 1 4 INSTALLATION CAUTION Your TR 7400A Transceiver to be operated as a mobile station should be securely mounted under the dashboard or similar location using the accessory mounting bracket and bolts Improper installation will result in damage to the transceiver and dashboard Consideration must be given to the dashboard material prior to installation More detail ed information on installation will be found in SECTION 3 1 the MOBILE USE page 7 NDARI NADA RU SA A A ULI UNTRIEDEN TT SECTION 2 CONTROLS AND WHAT THEY DO SS A SS ASAS STAR UA UTA SS AU AAA ESO SALA AAA AAA SA ANA TA O A KENWOOD CO D n LI L L U Fig 1 Front Panel View 2 1 FRONT PANEL POWER Switch Turns power on when pressed in HI LOW pushbutton Switch Refer to the HOW TO USE THE HI LOW SELECTOR SWITCH section page 10 Used to select high 25W or low 5W RF output Power TONE Selector
18. uld be fully fastened to get full effect of the spring action Fig 4 A Typical Installation CAUTION Be sure that both rails are fully seated in the mounting bracket before clamping the locks B O d y o IIED LLL LLL ALA LLL LLL Lah hbk LLL Slide the set into the bracket as far as possible o Lock Pawl Adjust the vertical angle of the set Hook on the pawl and fold forward Fig 5 How to Install 3 Connecting the Power Supply Connect the supplied power cable securely from your trans ceiver to the battery power supply posts Make certain that the red lead is placed to the positive post and the black lead to the negative post If necessary attach the power cable to the vehicle body at the appropriate points to avoid dangling NOTES 1 The power cable should be as short as possible 2 An alternative way of obtaining power is to plug the cigar lighter arranged in most vehicles Such a plug shown in Fig 6 is available at auto accessory shops or electronics parts stores ASA AA AAA AA AA ES STA A A AR RS SA A SA AAA AU TEL TEE TTS SECTION 4 OPERATION SIAM ADAN RIDAD IIA DUT A ADD 4 1 RECEIVING 1 Connect the supplied power cable to the DC power connector and the antenna cable to the ANT con nector 00 Select a DC power supply or battery pack having 8 to 10A current capacity at 13 8V CAUTION Make certain that connection of the positive and negative power cable leads have been conne
19. z Selector Switches 42 9 9 and 5 kHz Offset Switch 15 to a desired channel 5 Depress the microphone push to talk switch to operate the TR 7400A in the transmit mode The ON AIR Indicator will light and the meter 5 pointer will deflect to indicate the RF output power 6 The best separation between your mouth and micro phone is 5 to 10 cm e NOTE You can check the operational condition of the antenna system by observing the reading on a standing wave ratio SWR meter It is recommended that the antenna system SWR is 1 5 1 or less The transmit power will be reduced by a protection circuit when the SWR is too high The TR 7400A is designed so that the Meter will read 8 when operating high power 25 watts into a 50 ohm load The antenna system therefore is acceptable if the meter reads around this value The meter in this sense acts as an SWR indicator 4 3 HOW TO USE THE TX OFFSET SWITCH The TX OFFSET Switch D used mainly for repeater opera tion has three positions SIMP Your TR 7400A operates in the usual simplex mode That is the RF receive and transmit fre quencies are the same This frequency is indicated on the Digital Fre quency Display 8 600 Your Transceiver can be used for repeater opera tion The Repeater indicator will light red The RF reception frequency is the same as indi cated on the Digital Frequency Display but the RF transmit frequency is 600 kHz higher than in
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