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SSB..... another one of my "clarification checks"........ If I am understanding everything to this point.......... IF..... TR24 and TR25 are installed....... and in the board....... If you REMOVE TR26..... XMIT/PA audio is GOOD. If you PUT TR26 back in..... XMIT/PA audio goes missing...

Hey Brandon! I don't know if you are still up...... here is my thinking... double check me and see what you think.... As I look at the circuit around TR26 I see the base bias leg as the bottom 6.48 v node... through R131 (10K) then through D46 then over to the AMC pot VR12 (500 ohms). The...

This is getting interesting..... because you should be able to clip meter black to ground.... meter red to the anode of D64 ..... and see that voltage change from about .6 v (one diode drop) and go up as you rotate the pot..... When the pot is at the bottom the cathode is grounded which means...

Where exactly do you have the red probe as you are measuring?

Hi Xracer,I am not sure if it was off to begin with or not.... but he did just tell me that... with TR24 IN...... and TR25 OUT.... he STILL has audio. And when he put TR25 back in... he lost the audio again. That makes it sound like TR24 is doing it's job..... but that TR25 is TELLING it to...

Just passing this along..... It looks like you are already determining that TR25 is telling TR24 to clamp the mic off. You can pull either transistor OUT and you recover your XMT/PA audio! So now we are "backing up a step" Either the components AROUND TR25 are honked.... CAUSING it to tell...

Sounds like you are on the way! I hate to see you have to use those parts.... but it sounds like something is hosed in the AMC/ALC that is "causing" it to think that modulation needs to be cut completely off. At least NOW you know what is doing it!!!!!!! I'll go back and take a look at the...

I would be really curious to know what you are getting on the collector & base of TR24... DC measurement. If that collector looks like it is a hard ground.... I would consider popping TR24 off of the board briefly.... and see if your mic functions suddenly start working. That collector...

WE ARE GETTING CLOSE I just backed up and reread your last update.... R126 Look on those schematic segments I sent!!! The output of R126 is tied to the AMC circuit.... TR24. And you said you had audio IN to R126 but NO AUDIO out of it. Check voltages on TR24 because it sounds like it is...

SSB.... see if any of this nonsense makes sense! :) Sorry it is rotated that is just the way the scanner picked them up.

I have a "gift" for oversimplifying things. That said, I am going to dig around a bit in the schematic but here is my thinking..... (and I am more or less just thinking out loud to try to organize my thoughts!) Below is a subsection of the block diagram. If RCV works in any mode.... then I...

not AT ALL to irritate..... simply to clarify....... when you say "No modulation on AM, SSB or PA" what I am interpreting is.... when the radio is set up and unkeyed, it will output sound for either AM or SSB ( I am assuming both USB & LSB) but when you transmit.... AM, USB or LSB.... no...

Interesting thought Mike. It would be good to have something like this in my stash for those REAL close up needs... like mine!!!!! Thanks.

For background, what got me started looking... is this darned JC Penney Pinto 23 that has a problem (AFTER MY DUMB SELF clipped a ground onto the heatsink of the audio/regulator transistor and didn't think about it being the darned HEATSINK..and thereby the collector of the transistor. It was...

Another "different kind" of question. As I get older... my vision is getting incrementally weaker. I thought I would ask.... Do any of you involved in repair... use a magnifying/illuminating lamp of any kind? I was thinking of getting one to help locate those "pesky small" parts that like...

Other than small pockets here and there..... I wouldn't hold out much hope for finding those!

I didn't want to hijack Dan's thread.... on looking for Uniden document...... but I have a semi related question..... I know that I have looked for several Uniden service manuals and was unable to find them. The most "memorable" at the moment is a PC68. I have had many people steer me...

I caught myself last year... trying to "estimate" how many solar peaks I have left in my life. THAT is a heck of a way to look at things!!!!!