Poly Comm N-12 info

[nycber]

I just acquired one of these in decent condition...practically stole it for the price. It's the version with 8 channels. I'm trying to figure out the crystal needed for channel 14. Got the Rx figured...need 33.125. Now looking for the Tx numbers. Does it just use the fundamental or does it use tripling? If so, I gather 9041.66 would be what I'm looking for. Radio plays ok, needs some filter caps. Working on proper wiring for unamplified D104 and glad I saw the schematic...there's at least -90v running thru the mic circuit in order to bias the Tx circuit off. Put in a plastic blocking cap so this doesn't get into the mic element. The G stand switching isn't right though...it's not disconnecting the Tx before kicking in RX...resulting in a loud chirp. Need break before make switching and I may just build a breakout box like I use on my Kenwood. There will be a few of us in upstate NY..north of Albany...looking to start a 23 channel group to fire up for a day or night..possibly once a week. Thanks in advance for any info on the Poly.

[Polycomm]

Polycomm PCN-8-12
Channel 14 = 27.125
TX crystal  = 9.0416
RX crystal = 33.125

I never connected a G stand to mine - always a TUG-8.

The pinout of the front connector is:
1 - mic hot (high impedence)

2 - ground (and mic ground
3- TX (ground to 2 to transmit)

4- RX (ground to 2 to receive) 

Because you cannot make/break out of sequence with the switching between 2 and 3 to ground there may be something else causing the squeal (old caps or RF getting onto the mic circuit) .