Although I haven't spent a huge amount of time on what should be a
simple conversion, I would like to get the opinion of a Micor guhru or
two.
I'm converting a Micor base to repeater duty. It was originally a dual
receiver single transmitter intermittant duty machine on 149mhz (yup,
both receivers on 149.xxx). I'll deal with the limited heat sink on
xmit and shielding by greatly reduced power and fans if needed. It
will be carrier squelch for now, it does not have factory PL. I will
probably modify for a external controller but much later.
The receiver blew my mind. I haven't even tuned it by the book yet and
I can see it is super sensitive. I hope selectivity will be there too.
My problem is getting it to repeat. I made (I assume) all necessary
jumpter changes on the modules as well as cage and receiver
interconnect boards. I can go into xmit manually proving the ptt line
works. Otherwise, no repeat. I did have one small problem that
actually may have helped see the whole picture. I lost a diode
(shorted CR16) on the squelch gate card that send the machine into
continuous xmit. I killed the pa but left the exciter up to get a
better look at it. While held in xmit, I noticed that I could set the
squelch on the SG board like it should be and although not quite
right, the timeout timer was working. It actually backwards. It times
out with squelch closed but doesn't when open. Probably due to the
state of that ptt line.
Anyway. Any ideas as to where to concentrate on to get a better idea
why I can't get it to repeat. Remember; I could set the squelch
threshhold on the SG module when that diode held transmit on.
Otherwise it does nothing. I know I'll slap myself when I find it, but
maybe one of you guys have already "been there and done that". Thanks
for your help...Don...N5MZQ
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