Yes, there is absolutely programming to turn aux PTT on. Usually under "extended function" or something similar.
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On 9/9/2018 2:55 PM, Skyler F electricity440@... [Repeater-Builder] wrote:
I'm working on a project with a
900MHz repeater, 2 meter remote base, and 70cm remote base.
Kenwood TK-941 , Kenwood TK-880 and Kenwood TK-7180. I am using the
accessory connector ( 15 pin Molex) installed on these radios.
So the radios that I got for the project almost all do not have a
functioning auxiliary PTT. I see 4.8-5V on the PTT line, but when I ground
it, nothing happens. I traced the wire to the pin on the microprocesser
chip, and the AUX PTT input is for sure grounded and going to 5V when I
short the pin on the Accessory connector.
NONE of these radios have functional auxiliary PTT, and ALL of the radios
have functioning MIC PTT. Does anybody know if there is a software setting
to enable / disable this aux PTT on the models listed above?
The ONLY radio that works, is the TK-941 that is supposed to be a receiver
for the 900MHz repeater. This one does not have a DEAD PTT, and since the
microprocessor chip is in the control head, swapping out the control heads,
and reprogramming the codeplug solved my problem with the TK-941, but I
still have 2 other radios with bad PTT inputs...
If not, I am sort of putting bets that someone before I messed with these
radios hooked 13V up to the PTT input line and blew out the pin on the
microprocesser chip. I see some clamping diodes for input spike protection
on the service manual, but I'm sure a high current supply could have blown
right through these clamping diodes.
Anybody had this problem with Kenwood Mobile radios?? Is this a software
switch or likely a hardware failure?? I know on the 941 it must have been a
hardware failure with the success of replacing control head, but not sure
on the other radios?
Thanks!
Skyler
