Question about Cobra 25 LTD 40-Channels Base CB Radio

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Rf meter not moving when keying up - Cobra 25 LTD 40-Channels Base CB Radio

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If the radio is transmitting fine, then the meter is shot. It happens. You can get them cheap on ebay. Its 2 wires and 2 screws. You need to un solder the old one and solder in the new one.

Posted on Oct 21, 2010

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Trying to setup a cobra 29ltd chrome. Put on channel 20, switch set on cal, keyed up the mic, and when I turn the swr cal knob the needle won't move. Magnetic ant with acc outlet for power Any ideas


First, make sure that the CAL/SWR/RF switch is set to CAL. If you still can't move the needle, check the RF output. If the needle moves to the far right, you at least have output power, and something is wrong with the SWR circuitry. Does the needle move with incoming signals?? If the needle doesn't move, then you either have a damaged meter. If the needle moves on rec eived signals but not when you transmit and the switch is set to RF, then you most likely have a damaged transmitter output stage.

Oct 01, 2016 | Cobra 29 LTD CB Radio

1 Answer

I have a General Lee I am Working on. It has ears But will not Dead Key. Replaced Both Finals, Driver, Audio IC . I am Stumped :-(


On the RF Hi Lo switch do you have power? Is the switch ok? That switch regulates the TX power and if it is open, you have none.

Apr 12, 2016 | Connex Radio Communications

1 Answer

What's up I have a uniden Washington no sound out of the speaker but it is receiving you can tell by the s meter moving.?


do you have the volume turned up? Squelch turned all the way left and RF gain all the way right. If you still don't hear anything check to see if this model has a dynamic squelch .If it does turn it off.

Sep 30, 2014 | Radio Communications

1 Answer

Wx works but no cb tx or rx


Antenna good? Receive meter move at all? radio show transmit when key mic? more you tell me the better I can help---I will assume you know enough to make sure RF gain and squelch are set correctly.

and cb/pa in right position........

Apr 27, 2012 | Radio Communications

1 Answer

S/rf is too high on transmit on my cobra 29 ltd bt


no matter what s/rf you are looking at it should not key much beyond an s-9 . vr 3 controls the meter. Key the mic and adjust it to s-9 then check you modulation.If you still think you need more then adjust vr 4 .

Jan 07, 2012 | Cobra 29 LTD CB Radio

1 Answer

I have the Coba 29LTD Classic when i key up my meter do not move . i can git incoming but can not git out


did you ever check the swr's.. if they were high may have blown,. the final rf transistors.

Jan 23, 2011 | Cobra 29 LTD CB Radio

1 Answer

Swr meter not moving


follow these steps to adjust the
standing wave ratio(SWR).
1. Turn on the CB.
2. Set S/RF/SWR/CAL to CAL.
3. Key the Mic and rotate SWR CAL so the meter points
to CAL.
4. Unkey Mic.
5. Set S/RF/SWR/CAL to SWR.
6. Key Mic again and note the actual measurement on
the SWR scale. Refer to the following table to interpret
the reading.

1:1 - 1.5 Great
1.5 - 2:1 OK
2:1 - 3:1 Not So Good
Higher than 3.1:1 Terrible

Jan 14, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a uniden 68xl with no audio. The audio chip is good. It has key and swing just no ears. What else could it be?


make sure the RF gain is on max.

If the meter is moving when receiving, but you don't hear it, it could be the mic. Try a different mic and see if it works. It could also be a broken wire to the mic jack.

If the meter doesn't swing when some one is transmitting to you and you don't hear them, there could be either something wrong in the receive section of the radio, a bad resistor in conjunction with the RF gain control, or it could just be a bad knob.

You can hot wire it to full to check it like this:

Look for the wires on the RF gain knob. Its 2 wires. Disconnect them form the knob and twist or solder them together. If you have receive after that its a bad knob.

You can replace it, or just solder the wires permenantly together and put some shrink tube on it and use it like that. You don't need RF gain any way.

Most of the time its on full any way. no need to turn it down.

Nov 18, 2009 | Radio Communications

1 Answer

When mic is keyed, TX light illuminates but power meter does not


make sure your s/rf switch is in the right place on the radio is the most common problem i have found

Feb 05, 2009 | Radio Shack TRC-447 CB Radio

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