KENWOOD Tk-720 and tk-820 can only be programmed with the Kenwood programmer model KPT-50.

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KENWOOD Tk 720 mobile is programmed with the same programmer as used with Tkr-720 / 820, a jack RJ 45 enters the entrance of the microphone, the other under the cover of the radio, and there in front of you there is an entry for the black programmer, you plug in and there you start to read the equipment.

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Well going to the radio look:
The radio is programmed with a Kenwood programmer is the original model KPT50 of Kenwood, this has two connectors, one that plugs into the plug of microphone where it takes its voltage, and another black in the form of pins that is introduced in the socket of programming that comes inside almost to the front left of the equipment to do the programming of frequencies only.

 To program the tone card either KQT-7 (QUIET TALK 8CTCSS) WITH THE SAME PROGRAMMER
WHEN YOU LOOK AT THE PROGRAMMER YOU SAY:

STEP 1 TYPE OF RADIO THERE SELECT THE MODEL.

STEP 2 TIGHTENING THE STEP ONE THAT SAYS TO PROGRAM.

AND FROM THERE IT GIVES YOU THE CHANNELS HERE PASSING FROM ONE TO ONE TO PROGRAM THEM WITH RX- TONE RX TX- TX TONE AND THERE YOU GO WITH THE PROGRAMMING AND THE LAST YOU SAY IT TO PROGRAM (WRITE) AND IT DOES EVERYTHING,

FORM NUM. (2) YOU CAN DESOLDER THE IC4 - 93C46PI YOU GO TO YOUR PROGRAMMER AND GIVE IT ALL THAT REQUIRES FREQUENCIES, CHANNELS AND TONES CTCSSS, AND THEN BACK TO WELD WHERE IT WAS TURNED OFF AND TURNED ON THE EQUIPMENT, ADJUST THE VCO OF RX TO 4.5 VCD AND TX TIGHTENING THE MICROPHONE OF EQUAL FORM OF 8 VOLTS TO 4.5 AND YOU WILL SEE THAT THE POWER IS RELEASED AND AFTER YOU CONTINUE ADJUSTING THE RX COILS TO THE FREQUENCY THAT YOU PUT WITH SERVICE MONITOR.

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Information from:

https://www.yoreparo.com/radiocomunicaciones/preguntas/266035/tk-720-kenwood-necesito-programar&prev=search