Cobra 29 classic can only get two watts output. Tweeted on L13 and 14...no improvement. SWR is 1.3 to 1. Also...when the radio get hot and the noise limiter is on the audio level drops to almost nothing. If I turn off the limiter....I have plenty of audio. Any sugestions
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could be a Vr inside is turned wrong way. If you turn it one way the audio is turned up. If you turn it other way you turn the audio off.. Its sometimes chrome with screwdriver slot in middle or a white turn knob with 4 way screwdriver head. Sometimes its reverse. so if you think turning clockwise makes it go 100% it may be taking it back down to 20% instead. It may be counterclockwise to get Audio loud. Different radios have counter or clockwise positions different. Experiment.. turn up mic gain all the way up to Max on radio and spread coils inside 1/8 inch apart.
Receive amps on a Linear's can cause this issue---the key question is what is the dead key wattage in the radio adjusted to?
You hook an amp up--jumper cable length between amp and radio is critical---the power output of radio is critical--put 4 watts into a 75 watt amp and it will be over driven-- The proper way here is with radio and amp hooked to a big dummy load adjust the radio wattage output so the radio keys up the amp and gives maximum forward swing on a watt meter. (in some cases as little as 1 watt output from radio)
Some people call this matching the radio to the amp---The antenna system then becomes involved--further adjustment of the radio with the antenna system connected will be needed (power output) for the amp to work well.
If just a 29 LTD lowest Swr should be on channel 20.
Note: also important to check the swr with the Amp on as if power is being reflected back at radio when amp is on more needs to be done.
for a mobile or home base setup 100 - 250 watts is enough on all modes am / fm / ssb / cw, 1000w or 1 kw would be a overkill. what transmitters rely on is a tuned antenna and swr near 1:1 or 1:1.5, achieving a good tuned antenna will give you a clean output and good signal.
Your SWR is probably NOT fine. You need to use an external meter if you have had work done to the radio. Especially if you have had a swing mod done to the radio. When you do this, the dead key of the radio is lower then the calibration knob on the radio can adjust for. It will always come up lower then it actually is.
Your radio might have been fine before the work was done on it because it was putting out very little power. Now you are most likely putting out 50 watts or more. Big jump from 4 watts.
When your raise the power in a radio, you will notice more when the antenna is not properly tuned.
In most cases with a stock CB, even when the antenna is not even near tuned, you will get a reading less then 1.5 anyway.
the more power you put out, the more important it is to have a good match.
But an external SWR meter, and check it. be careful if the ANT light is on.
You might also want to check your coax, connections to it, and your antenna for anything wrong.
I believe it to be feedback but be aware of your Standing wave ratio because using a linear amp radiates signal to the point that it could cause that light to come on. There is a problem if the radiated signal is feeding back into the amp a a higher level that it can withstand over time.