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Cobra 148 GTL 120-Channels Base CB Radio - Page 2 Questions & Answers
Cobra 142 no audio
Check to make sure the ext speaker jack is not worn out. Even the internal speaker will not work if it is worn.
Cobra 1000 will not receive or transmit.
Sounds like a problem with the VCO / PLL Circuit since nothing happens in RX or TX. Check to make sure you have the correct supply voltages to start with and also check to see if you have 10.240Mhz. Use the service manual and go through the PLL/VCO alignment section. If anything is missing then you at least know where to look.
Rf out ok no modulation but mike ok
Hook up a speaker to the PA jack on the back of the radio. Put the CB into PA mode and see if any audio is coming out of PA jack. This will tell you if the AUDIO AMP IC TA7222 is good.
Transmits off frequency
did you put it on a frequency counter? they can be set back on freq. if you know how to set it. how old is it? I would send it back to where I got it and have them fix the problem.
I there got a cobra 148gtl-dx and was wondering
There is no "best smallest" Base antenna. You can get a workman saturn B base antenna, it is small and black, but they do not work so great.
the best bang for your buck is an antron 99 base antenna. Unfortunately it is 18 feet long when put together. But if you spray paint it a dark color, and put it up in a tree you will hardly notice it.
When it comes to base radio's, smaller is not better, and you cannot get a best.
Antron 99 is the smalles antenna that will fall into a near best category.
But the saturn B will still work if you absolutely need small. you can find a bunch on ebay cheap.
Echo wires diagram
why waste your money on an echo board .you should buy an echo chamber . They operate on the outside of the radio so people that don't know how to wire one in can still have one.the echo board should have come with schematics,if it didn't you may have to google it to get the schematic you need.
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