I have a used cobra 29 ltd st cb. and i have changed mics off of it and put a mic off of a cobra 19 ultra 3 on it. they both have the CA-73 on the back of them. i can receive all kinds of signal but i cant talk backt to them and them beable to understand mem they say that its not very loud. my cables and antennas are all fine and the mic i just out on there off my ultra 3 all work, i could talk for a couple miles with the ultra 3 installed, but now with my 29 i cant talk back to them for them to understand. how do i fix this?
Did you tune the antenna??
The antenna needs to be tuned for best SWR.
If the antenna is not the right length, then you will get signal reflecting back into the radio. this is bad and it can damage a radio.
The 29 has a built in SWR meter.
The lower the SWR the better.
Here is how to check the swr.
Turn to ch 20. Put the sf swr cap switch to CAL. Key the radio. With the radio keyed, turn the cal knob up until the meter is all the way to the right on the cal mark. with the radio still keyed, flip the switch to SWR. Where ever the needle falls is your swr reading. The top line is SWR. If it is above 3 this is really bad, and your antenna is no tuned and you are hurting your radio. You need to adjust the antenna length.
Turn to ch 1 and take an SWR reading the way I explained. Then do the same on ch 40. IF the SWR is lower on ch 1 then 40, your antenna is too short, make it longer. The antenna has a way of adjusting it. Usually the whip slides up or down in a colar.
If the swr is higher on ch 40 then 1, it is too long, and you need to make it shorter.
Keep making adjustments until the reading on 1 and 40 get lower, and are about the same.
Then check ch 20 again. It should be low, 1.5 or under. Then you are good to go.
you will find people hear you a lot better, way better then ever.
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