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Generally,the rf gain increases the receiver sensitivity to pick up weaker signals.If you turn gain down you will only hear the stronger,nearer signals-if you turn it up you will hear weaker,more distant radio signals.Most people keep gain high especially when trying to talk skip.
Would bad inductor coils cause symptoms like weak RX and TX? Are the inductor coils near the driver [L34,L32,L33] supposed to be black looking and able to turn on the wire?This is in a Cobra 142GTL.These are the only parts that look like they might be burned in the radio.Everything else seems to...
This thing is advertised as a book even novices can use for fast and easy cb repairs-I got it and it certainly is not for novices!Sure,it has some valuable information-if you're a tech and can understand all the gobbledegook!No diagrams-just a lot of text and some schematics I could have gotten...
I forgot to mention it is a very clean,unmodified radio-the tuning coils are still sealed with wax but it appears that the original 1306 driver was replaced with a 2166-I don't think the different driver would cause rx problems?
Switch kit-My 142 has weak receive and weak transmit.I can only hear very close stations and tx is only about 2 watts.I replaced IC5 because I was told it was a common failure in the 142.Now if it was just tx I would suspect a blown final or if just rx a bad FET1 or front end transistor.There is...
I bought this meter but the 100 watt scale does not seem to work-no difference from 10 watt setting.I looked inside and wire going to switch seems bridged between 2 globs of solder-is this right or sloppy soldering from factory?
I'm trying to fix a 142 myself-the local tech wants $50.00 an hour plus parts!I'm trying to find someone who has a Sams photofacts CB219-it seems this volume is hard to come by.I know I could get it from the sams website but I hate to pay so much for something I would only use once.I already...
Thanks for the reply-I will try to fix it myself because I could buy another radio for the money a tech would charge.This is what happens when you get a radio from Fleabay!
Already posted in tech section but I thought I would try here also-142 with weak receive and transmit? I replaced IC5 but no improvement-could I have both blown front end transistor and blown final?Schematic shows 1306 driver and 1969 final but I have 2166 driver with 1969 final-could this be a...
My 142 has weak receive and transmit-I replaced IC5 which I was told was a common problem with these radios.Replacing IC5 has made no difference-still weak rx and transmit only about 1.5 watts according to my cheap watt meter.My question is would a bad final or driver also affect receive?The...
Thanks for the reply-I am one of those"screwdriver"experts just trying to get my radio working.The radio does have a 1969 final but I have no idea if it's good or not.I'm hoping the new IC solves the problem.
Well,I bought a new IC5 [mb3756] and will see what happens.The radio is in nice condition and I am determined to fix it.I already replaced an audio IC in a Cobra 29LTD that I bought for $5.00 and now it works great-I even installed a roger beep in the 29 and now it sounds like an export...
I have a 142 with weak receive and weak transmit.I see that the 1306 transistor was replaced by someone with a 2166 transistor -could this be the problem?The 2166 is rated at 6watts while the 1306 is 16 watts. I also know that IC5 is a common problem with these radios-should I try replacing IC5...
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