Recent content by JNJ

However the only way I can receive is by turning on talk back. (Talk back is built in) PLL pin 9 is still showing 4.5 volts instead of 9 I’m starting to feel in over my head here But I’m continuing to work and study the suggestions given

Thank you, I do have an old RadioShack frequency counter I use often but it has an antenna on it. The antenna is connected to a BNC connector so I can probably use another BNC connector to make a high impedance probe with a ground for testing those frequencies. I’m quasi familiar in a textbook...

I just want to tell you, you’re incredibly beneficial as a teacher and I’m very appreciative of all this help. Don’t stop doing what you’re doing. Anyways I have a lot of research to do and I will update the thread if anything new develops.

Hey so I was reading through your suggestions and I checked the voltage on pin nine I have about a 4.8 V as well as on R86 IC4 kept getting hot enough to melt the solder around it which is why the solder joints looked cold Took it out and there was a short between the output pin and ground...

Way the static continues even though the microphone is not plugged in and ic4 is getting hot OK so here’s what I figured out RF gain (collector to tr6) does not attenuate the signal However turning off the talkback circuit completely stops the noise (with or without a microphone) So the...

Wow I really appreciate all the work that you put into this and I will definitely take the time to sit and absorb it all. Thank you very, very much.

The volume control does attenuate the noise.

The volume control does attenuate the noise. TX is clean Judging from the other post there are several capacitors around VR 1 one that could be a culprit But the board definitely looks like someone’s been re-soldering on it however I’ve seen these surface mount parts on other chromes And I...

IC4 is the audio chip, thats why I’m wondering if it’s a mod causing the bad static

So there was another thread exactly like this on the same radio model. I’m going to use those hints and suggestions to try to fix this but the one thing I need help with is the bottom of the board looks very rough I’m going to post a few photos of the board and see if someone out there can let...