You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
A Winner has been chosen for the 2026 July 4th Retevis RA89R Giveaway! Click Here to see who won!
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
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...
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...
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...
if this is the washington with the MB8719 PLL chip in it then change R204 to a 1.2K ohm resistor, and add a 1uF non-polarized capacitor from pin 9 of the audio chip to the junction of R121, R204, and D62.
make sure to restore any modulation mods to stock before doing this mod.
you do need a...
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.