Kenwood TKR-751 Modification Information Manual pdf 8 page image
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Kenwood TKR-751 Modification Information

Also see for TKR-750: Brochure & specsService manualService manualFunction referenceService manual

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Contents
  1. Table Of Contents
  2. TERMINAL FUNCTION
  3. pin Connector
  4. terminal function
  5. pin Connector (CN601)
  6. MODIFICATION OF THE ANTENNA
  7. INSTALLING THE VOICE SCRAMBLER BOARD
  8. Installing the SC20-460
  9. Configuration with the Software
  10. MODIFYING THE DC POWER
  11. EXTRACTING RSSI SIGNAL FROM THE ACC 25-PIN D-SUB CONNECTOR
Kenwood TKR-751 Modification Information Manual pdf 8 page image
Version: 1.02 USA Modification Information (MOD) 31 TERMINAL FUNCTION1.3 25-pin Connector (D-SUB)The 25-pin connector is located on the rear panel of theTKR-750/850/751/851 and you can connect externaldevices, such as a trunking controller.Figure 1-4 25-pin connector (D-SUB)Table 1-3 Assigning signals to 25-pin connectorNote: Refer to the “Function Reference” for functions that you canassign to the Auxiliary Input/Output terminal.No. Pin name Input/Output Description1 NC --- No connection (RSSI output after modification; 0.2 to 2.5V)2 RXD2 Input PC serial data input (COM 2); TTL/RS-232C levelH=more than +2.4V/ L=less than +0.4V/ 5ohm Road/ for FPU read, PC Tuning3 TXD2 Output PC serial data output (COM 2); TTL/RS-232C levelH=more than +5V/ L=less than -5.0V/ for FPU write, PC Tuning4 AUXI 1 Input H=more than 4.0V/ L= less than 1.0V/ 5V pull-up5 AUXI 2 Input H=more than 4.0V/ L= less than 1.0V/ 5V pull-up6 AUXI 3 Input H=more than 4.0V/ L= less than 1.0V/ 5V pull-up7 DG --- Control line Ground (TXD/RXD/AUX, etc.)8 TD Input Transmission Data input; Deviation=15% STD@0.5Vpp 100Hz (Adjustable)600ohm Road, 50uF AC coupled, Non Pre-emphasis (+1/-3dB@0-10kHz)9 TA InputTransmitted Audio signal input; Deviation=60% STD@280mVrms 1kHz (Adjustable)600ohm Road, 1uF AC coupled300-3kHz +6dB/Oct. (EIA curve)@TA line pre emphasis off=Enable300-3kHz +/-3dB@TA line pre emphasis off=Disable10 RD Output Received Data output; 80mVrms@1kHz STD/ 1kohm Road/ 10uF AC coupled/Response +/-2.5dB@0 - 5kHz/ Non-squelched11 RA Output Received audio signal output; 400mVrms@1kHz STD/ 1kohm Road/ 1uF AC coupled/Response -6dB/oct@300-3kHz/ Squelched12 RXG --- Ground for RA/RD13 SPM Input Speaker Mute input; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ Active L14 NC --- No connection15 EMON Input External Monitor Switch input; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ Active L16 EPTT Input External PTT Switch input; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ Active L17 SC Output Squelch Control output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ L=Busy18 NC --- No connection19 TXG --- Ground for TA/TD20 AUXIO 1 Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max21 AUXIO 2 Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max22 AUXIO 3 Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max23 AUXIO 4 Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max24 AUXIO 5 Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max25 AUXIO 6 Input/Output CMOS Level Input/Output; H=more than 4.0V/ L=less than 1.0V/ 5V pull-up/ 0.2mA max
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This manual is suitable for:
TKR-750TKR-751TKR-850TKR-851
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