I've got a used, (and Factory Reconditioned, no less) Cobra 148 NW ST that is giving me fits. Of course, the NW doesn't work, but that's not the issue.
The issue is: when I first got the radio (eBay of course) it wouldn't transmit or receive on channels 30 - 33. PLL and everything else checks out Okay, so I realigned the radio according to the Factory Service Manual on CB Tricks, and that did not solve the issue. So, thinking it must be a 'worn' channel selector, I sprayed it inside with tuner cleaner and then rotated it back and forth. Finally got channels 30 and 33 working, (although I have to transmit FIRST before they will come into receive), but channels 31 and 32 just transmit NOISE (at full power) on about 27.323 MHz (or thereabouts). So, still thinking it was the channel selector, I took the whole thing down, unsoldered the Channel selector, and replaced it with a KNOWN good one. Turns out that wasn't the problem; rig still wont TX/RX on channels 31 and 32 ONLY.
Any thoughts on WHERE I should be looking next?
The issue is: when I first got the radio (eBay of course) it wouldn't transmit or receive on channels 30 - 33. PLL and everything else checks out Okay, so I realigned the radio according to the Factory Service Manual on CB Tricks, and that did not solve the issue. So, thinking it must be a 'worn' channel selector, I sprayed it inside with tuner cleaner and then rotated it back and forth. Finally got channels 30 and 33 working, (although I have to transmit FIRST before they will come into receive), but channels 31 and 32 just transmit NOISE (at full power) on about 27.323 MHz (or thereabouts). So, still thinking it was the channel selector, I took the whole thing down, unsoldered the Channel selector, and replaced it with a KNOWN good one. Turns out that wasn't the problem; rig still wont TX/RX on channels 31 and 32 ONLY.
Any thoughts on WHERE I should be looking next?