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ok, Should I be using one of the ub-1 talkback boards in this thing or what? thanks for all the help so far! Cas

OK, First off I do not see a d- 90...But do have a D-80. Clipped it... This is the way I tried. Several different values of resistors... to make sure I have the right pin on the audio its the fourth one, Right? From front of the radio to the back. I ran from that pin to #2 mic...nothing...

I will try these suggestions and post results. Thank you!

Btt... Good one

Whatcha thinking? HMMMMM.....

Agreed! The Astatic mics have a crisper tone to them.Turn down the mic gain settings even more! It seems your overdriving a radio set to its peak performance! What happens when you turn the mic power AND mic gain even further down?

Anyone know how to install talkback in this thing?.... everything with the 690010z board already has talkback in it. With that said, I have looked at the procedure's to disable it in a radio with the tb in it and reverse them....with me so far? It does not work...I am sure there is something...

Ok...I now have a very excited and happy friend as all works just fine now. Nomad, i am glad that you said that about the different size because that's what I used. I was hoping it wouldn't hurt anything. Also there was a diode...um I can't think of the schematic number...but it was too, gone...

Nomad! your the man! Thanks everyone for the help...so far.... The electrolyc caps got rid of the humming and replacing the keying relay was able to work on ssb switch only. I know I still have something goofy going on here. Switch it over to am\fm and the realy goes to chattering again when...

I apologize...I should reword my question...Would the electrolyc caps make the relay chatter like it does? I have no idea why I said frequency...thanks for pointing out my error. Cas

Okay... I see exactly what you are talking about. One of the filters loooks really old and the other looks new.Someone has replaced it because the goo that comes out of one when bad is still there.(someone did a pisspoor job in trying to scrape it away ). I don't see any physical "zit" on...

any from 4 to 10 watts of drive. I am driving it with a galxy 2517. Same result, no matter what drive I give it, of course the deadkey output has changed...naturally. But when I try to talk it loses all... thanks

Just doubled checked.. Its hooked in correcttly. When I mod the wattage drops and when the amp gets good and hot Those relays go to chattering real bad when modulating. I also get a steady 15% modulation. I think its got a humm when keyed like that. Help?

Do the larger caps in the back provide the energy for the tube's or are do they provide energy fo the keying circuit?

A freind of mine brought this over for me to takle a look at. It chatters when you try to talk. It will hold a steady deadkey with correct frequency but when you mod the relays go to chatterin Can someone steer me in the right direction? thanks ]Cas