Question about Cobra 29 LTD CHR CB Radio Chrome Special Edition

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Should my calibration needle be set all the way in red on my cb

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If you are talking about where it should be on the meter, there is a wide mark where the needle should be.
Note this is only a reference meter it does NOT adjust your swr.

Posted on Oct 16, 2013

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SOURCE: 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.

Posted on Sep 30, 2011

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1 Answer

The calibrate needle wont move to the right to set whe trying to calibrate on cobra 29 ltd classic new radio


You have to press the transmit button to get the radio to send a signal that you can calibrate the SWR meter to. If you are pressing the transmit button and nothing is happening then it could be a blown final transistor, a bad switch, bad microphone connection etc.

Jul 05, 2014 | Cobra 29 LTD CB Radio

1 Answer

Does the green light turn red when I key the mike


Yes ,it must turn red when transmit.
you have to press the PTT and hold buttom to calibrate the SWR meter for readind.with the switch to calibrate(cal)

Nov 23, 2013 | Cobra 25 LTD 40-Channel CB Radio

1 Answer

My swr meter needle does not go all the way far right (cal marker) when I trying to calibrate.


variable inside radio not letting you.turn up the variable and the needle should come up also
check out vr 1 and set it for s-9 reading you may also try after to turn vr 2 and vr3 just a bit on both.

Oct 27, 2013 | Cobra 29 Lx Full-featured Cb Radio

1 Answer

When my calibration needle is all the way in the area my swr is really high


When your needle is all the way in the RED, your swr IS really high. That's what the meter is telling you. You need to clean all of the antenna connection points and adjust the length of the antenna to reduce the SWR (standing wave ratio) which is basically resistance to transmitting signals.

Oct 15, 2013 | Cobra 29 LTD CHR CB Radio Chrome Special...

1 Answer

Should the calibration needle be all the way in red


on cobra 29's theres a small arrow on the top line next to the red part of the meter.. thats the starting calabration location.. then when you set it to read the SWR.. it should go back left to the green.. you want it to be 1:1 and should try for no higher than 2:1 if its higher there may be antenna system problems..

Oct 15, 2013 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 refuses to calibrate


get you a external swe meter $40 at radioshack the swr on the radios are worth diddly their always off bad so it would do u no good with that one working i never use the internal cause they put out false readings

Mar 09, 2013 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

How do I calibrate my cb to match my antenna


1. You calibrate the antenna to match the CB rather than the other way around. Some antennas can be adjusted while others cannot. This should not cause a problem since the ones that cannot be adjusted generally don't need adjusting. The ones that can be allow for fine tuning to get a better match.

2.To match your antenna to your CB you set the SWR (Standing Wave Ratio) to it's lowest possible setting. SWR is the ratio of power that gets out through your antenna versus the reflected power that gets sent back to the CB. You want to get the most power to go out, or forward, through the antenna as this drives the signal that others receive. To set your SWR;

3.Connect an SWR meter between the antenna and the CB using a short piece of Co-ax cable. Set the switch on the meter to Forward Power. Key the CB and adjust the dial on the SWR meter until the needle of the meter is fully forward. Release the transmit button and change the switch on the swr meter to Reflected Power. Key the mic again and note how high the needle goes. If the needle doesn't go into the red it's safe to use but the lower the reading the better.

4. To bring it down check your antenna. Some antennas have a telescopic tip that can be extended or reduced by loosening a nut near the top. Try extending it fully and repeat the procedure at paragraph 3 above. If your SWR rises then try reducing the antenna length and check again. It's a matter of finding where you get the lowest swr by making smaller adjustments from the best of the 3 settings above.

5. You'll probably find that when you get a low SWR on one channel it will be higher on other channels. This is because of the frequency difference. Unless you use one channel nearly all the time, it's best to set the swr on the middle channel so if you have a 40 channel CB set the SWR on channel 20. The further you change up or down the higher the SWR will increase but it should be still within the safe range. If you set the SWR on say channel 1 the SWR will be twice as high when you change to channel 40 than it would have been if you set it on channel 20.

6. Most people never check their SWR so if you're using a commercial CB antenna, rather than a home made one, it should be factory set to give a reasonable match so if yours cannot be adjusted it's probably matching ok. A more common problem to look out for is the connection from the antenna to the CB. Make sure that the screening wire and the centre core are not touching. Even a single strand of the screening touching the centre wire will cause screeching on your transmission and before long will cause your CB to stop working. 73s and enjoy your CB.

Apr 03, 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

1 Answer

How do i calibrate an Aries swr 420 meter for a cb radio


To calibrate the meter set the switch to FWD/CAL/REF and key the microphone without speaking into it. then turn the control until the needle is on CAL. Unkey the mic, set the switch to SWR and then key the mic to read the SWR.

Thanks,
Dodgem250.com

Apr 16, 2010 | Radio Communications

3 Answers

Dont know how to use the swr meter on my radio


With radio turned on

1. Switch the first switch (S/RF SWR CAL) to CAL setting
2. Key mic up &
3. Turn SWR CAL knob while still keying mic until the needle is on the red CAL arrow at the far end of the meter scale. Unkey mic.
4. Switch the first switch back to SWR setting.
5. Key mic up again and record SWR reading and adjust as needed.
6. When done adjusting put switch back in the S/RF setting for normal operation.

Do not flip the switch with the mic keyed up.

Jan 19, 2010 | Cobra 29 LTD CB Radio

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