Question about Cobra 29 LTD CB Radio

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Swr meter not moving.

Hooked up old Cobra cb, model 29 ltd, can hear and transmit but swr meter not moving. Can't even try to cal. using cb manual. Meter just doesn't move much.

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Radios get bumped and banged around sometime they can be quite durable but other times all it takes is a little jar to disturb the TX or RX alignment.
The meter not moving far on CAL could be a bad meter not likely or maybe your deadkey/carrier power is below 4 watts which may indicate it has been lowered on purpose to drive a linear amplifier this is often accomplished with a swingkit which is the addition of a resistor and capacitor. Some misguided radio shops do this to get the modulation up.

Posted on Sep 30, 2011

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If the radio is working don't worry about the meter unless you absolutely want it. These little meters are not very accurate or reliable. Get an external SWR meter to check the antenna.

Posted on Apr 23, 2009

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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.

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Cobra 29 now Ltd classic Cobra 29 nw.ltd classic receives not well but does not transmit don't even move the swr./power meter any ideas


High SWR on antenna system.. may have mess up your RF final transistors. if you were talking on it for a long time. have someone check the SWR on the antenna system... should be a FREE service.

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Cb wont cal


put an external meter on it to get a match.

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Is there a way to get more range from a cobra 29 ltd? My buddy and I purchased this CB and are having difficulty getting a clear transmission at less than 1 mile apart on the freeway. Need help pleas


Is your buddy able to hear other radio traffic (squelch and RF gain adjusted for maximum reception)?
Is your microphone gain turned all the way up?

Did you follow the instructions for tuning the antenna with the built-in SWR meter? The built-in meter should be 'good enough' to get by with.

Is the antenna a decent brand/length? (Longer is better, the cellphone look-alikes are junk).
Was the radio bought new or used? If used, it might have a blown output.

Mar 07, 2012 | Cobra 29 LTD CB Radio

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I have a Cobra CB Radio and was wondering if I have it on SRF or SWR or CAL


S/RF/SWR/CAL SWITCH. When in the S/RF position, the meter swings
proportionally to the strength of the received signal. When transmitting,
the meter indicates relative RF output power.
When in the "CAL" position, the SWR meter can be calibrated by adjust-
ing the "SWR CAL" control to the "CAL" mark on the meter face.
When in the "SWR" position, the standing wave ratio is measured.

You will want to operate on S/RF position.

Jul 14, 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

29 LTD CB Radio: Calibrate cb radio...


The CAL is to calibrate meter for reading SWR (standing wave ratio) which is reflected power when transmitting back to receiver(radio) from antenna system.
This CAL switch position when selected and mic keyed uses the CAL knob to align the meter needle with inverted red triangle next to cal on meter. Then when you select SWR switch position meter will display accurately when mic is keyed for that channel. Now notice the difference when you go between channels 1 and 40. The ant led light will act as idiot light if it is not lit then you are most likely safe to transmit.
I say system because your vehicle, antenna and coaxial cable are all part of this system. When you have a high reading and have to trim you antenna this is really calibrating the antenna to the vehicles body which acts as a ground plane.

May 16, 2010 | Cobra 29 LTD CB Radio

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I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do


TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

Oct 11, 2009 | Cobra 29 LTD CB Radio

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My Meter Won't Move


weather can effect your meter .Those meters are not very accurate just a base line get a good swr meter and then check it.If your getting good radio checks it could be the potentoimeter is dirty . Radio shack sells contact cleaner and lube try cleaning it . That might help

Jan 08, 2008 | Cobra 29 LTD CB Radio

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