Galaxy 2100 frequency counter problem

[Gman]

Brandon7861 when I get home from work I will get the main board number. Nomad, the board is untouched. Ive owned my 2100 for at least a decade or two. I am ordering another TD6102 that the vco feeds. Amazing its still available. Ive noticed other schematics show the TA7310 getting the vco feed, but not the board I have. Thanks for all the help guys.

 

[brandon7861]

You must have some in-between version of the counter board. The only schematic I can find that uses the 10.6975MHz crystal also uses the 7310 mixer (the secret CB schematic). The schematics that show the 6102 mixer have a 3MHz crystal.

 

[999]

You must have some in-between version of the counter board. The only schematic I can find that uses the 10.6975MHz crystal also uses the 7310 mixer (the secret CB schematic). The schematics that show the 6102 mixer have a 3MHz crystal.

The schematic in the service manual I posted agrees with you and so does the counter board that I have sitting on my desk.

 

[Gman]

Brandon7861, very sorry. You are correct. The crystals are 3.2768 mhz AND 2.68375 mhz. Normally I use my sniffer loop, 3 turns of wire, coax center to shield, connected to an all band receiver, this case a TS-690S. Normally dialing up the crystals freq you can see on the s meter there's an oscillation. I pick up the 3.2768 crystal. The 2.68375 is iffy (meaning not a solid reading)for the freq counter is doing an oscillation itself. You can also hear this thru the radio speaker, like a two tone generator. This started when I replaced the zener with the 7805 regulator. Tweaking the 2.68375 trimmer did nothing. T602 and T601 did not help either. Not having a replacement crystal, I just loosely injected the 2.68375 mhz signal with the 690 (putting the 690 in transmit, AM, with power control turned down). Parameters changed somewhat, but nothing stable or fixed. This is where I am right now.