Well, I got this thing all reassembled and tuned up on the new frequency pair. a fellow ham (who used to work for the local Motorola shop) came over with his service monitor and we tuned and tested the system. It is still not passing PL to the transmitter. Some PL bleeds through from the receive, but I know that is not correct - nor is it of sufficient level. (I only get about 90 Hz of deviation with this PL.)
We took a CLOSE look at the Master Decoder card itself and it appears to be configured VERY differently than the later version depicted in my manual. For example, the later version card (based on two ICs) has no connection on Pin 24 to the backplane. My card (an earlier version with discreet components) appears to have some sort of signal (audio) on Pin 24. So I need desperately to find either the manual pages pertaining to my older Master Decoder card, or I need a newer version card. If ANYONE has either of these, I'd be much obliged of you would contact me. The issue HAS to be the Master Decoder card - it is not passing any PL to the exciter. The problem is, I have about 8 of the same vintage Master Decoder card, so changing them out is not resolving the issue. For the time being, I am going to put the machine on the air as-is. it works just fine, other than it will have to be CSQ receive for all users. I'll decide later on whether I will put in a tone panel, or continue to operate it as it is now. Mark - N9WYS / WQIV271
