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I have a pair Kenwood TK830’s I want to use as a repeater pair but am experiencing some difficulty.



1/ The RX unit has been modified to bring a buffered/isolated “Go To Gnd on COS” to pin11 in the rear 15 pin data socket. This has been tested and works.



2/ The TX machine also works as expected using a microphone (“TX” in panel and a full S meter” on a nearby monitor radio).



3/ If The TX’s PPT is grounded to pin 15 (GND) the front panel shows “TX” and a carrier is generated as evidenced on a nearby radios S meter. The radio works as expected



BUT



If the RX/COS is connected to the TX/PTT and the RX is ‘woken up ‘ by a nearby radio transmitting on its frequency its front panel shows “TX” (as expected) but NO carrier is transmitted (zero S reading on monitor radio)! This is also true if both radio’s GND(15) pins are connected together or not.



Question;

What is the microphone doing that a valid PTT in the back isn’t?

Why would the front panel say “TX” without transmitting a carrier?



73

BobJ

W4JPA

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