[App_rpt-users] RTCM and CTCSS pin 4

Shaun Rudling shaun at pmbnet.co.za
Sat Jan 14 20:54:23 EST 2012

I could not get my Kenwood TKR-750 to pull down the RTCM pin 4 enough to 
trigger the COR. The pin4 voltage got down to 1.1v which is not enough.

I fixed this by soldering a 540ohm resister from RTCM pin 4 to ground. 
It was just enough to bring it down to a switching point when the 
Kenwood sensed my 88.5Hz tone.


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