Recent content by loosecannon

what's the stability like with these progrock things? Im guessing much better than an old chunck of quartz? This is a very helpful thread, and will be more helpful as time goes on. I hope the future searchers realize what a gift this is. very cool. LC

excellent explanation. looks like the 138XLR you have there has the D21/D22 mod where they lift one side of the diodes and put a 4.7K resistor in the two holes left over. for those that don't know, this bypasses the speech compressor that this chassis is so famous for. With Nomad's mod that...

cable guy can you link us to the product you bought that works? LC

i can't speak from experience but i tend to trust what Nomad Radio says, and i just read a thread where he used Air Conditioning coil cleaner on a variable capacitor. It would be best to consult him before trying it IMO. LC

no, that's just a leftover from a signature pic i used to have.

this is a tough one because pretty much any question that someone or some thing could not just look up on google AI would alienate anyone who was new to CB radio.

the yellow wire is most likely gone because someone volted the final. this used to be a popular mod and it applies the full 13.8 volts to the final in AM mode. It was done because it could squeeze a few more watts out of the radio, but it came with costs, and imo is just not a good mod. here...

Remove R105 which connects to the base of TR33. replace it with a 1N4148 diode and a 5K trimmer pot in series. unbanded end of the diode goes to the base of TR33, and banded end connects to the trimmer pot. other side of trimmer pot goes to ground. I like to wire the pot like a rheostat which...

thanks for the note MKwrench. i haven't tried any other values because the 1uF just seemed to work, but now i will! LC

no need to mod these philomath, they are great with just a good alignment. my message was for MKwrench who might want to try this mod out. LC

MKwrench, those are all good changes, but there is a better mod for the audio. try changing the value of R228 to 1.2K and then adding a 1uf non polarized cap from pin 9 of the audio chip to the junction of R194/R228/D36. Leave the limiter intact and on the versions that have a fixed value...

i'll just add to the already great advice here to say that the temptation to increase the value of the filter caps should be avoided. yes, you can increase the value of the main filter cap where Vcc enters the radio. I do this on every radio i do. however, increasing the value of the filter...

i believe this is the one i used: https://cbtricks.org/radios/rci/rci_6900_f150/ LC

service manual says its VC1 which is located on the freq counter module itself. LC

an easy way to do what Brandon is telling you, and it is the correct way, is to put a current meter on the power wire going into the radio. put the radio in SSB mode with mic gain all the way down. install the "mirror board" that goes in front of the final and driver. now key the mic while...