I use a couple of EF Johnson Challenger 71xx UHF mobile radios for
the RX and TX side of one of my repeaters. Obviously there is no COR.
A makeshift COR signal is the busy LED which works to a point. The
busy LED lights up whenever there is ANY AND ALL signals on the
frequency regardless of the PL tone. A static crash, the noise floor
raising, a DX repeater, etc... it will trigger the transmit on the
repeater, but the audio will not pass because that is filtered by the
call guard (PL ). What I need to do is I need to grab the signal from
the squelch gate trigger to make a true COR.
However, directly taping to the trigger point with the controller
loads down the whole thing and nothing is received. I've tried using
a radio shack mps2222a transistor to make a transistor switch and
still, it loads it down. I'm thinking now of using a quad buffer/line
driver or something like that, but thats going to use a lot of space.
I'd prefer to just use a transistor or something. Something that I
can solder flat to the PC board and not have to run a pile of wires
and add a circuit board.
Does anyone have any ideas --- know of any transistors that could be
used that will not load down the gate/squelch? I need something that
is almost transparrent to the gate trigger.
Thanks
Dave
N9NLU
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