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Cobra 29XL: SWRs to high after calibrating according to the manual

Calibrated according to the manual... SWR still at 3.5 on the meter

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  • Cobra Master
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Tune your antenna not you radio. sounds like you don't have it grounded properly. new radio,new coax,and new antenna is the only way to do it right.make sure your antenna is at least 40" and it is adjustable with a set screw.

Posted on Nov 25, 2014

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Posted on Jan 02, 2017

tbirdfan1
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SOURCE: Cobra 29 SWR, cal meter

Hello there:
Rule of thumb is go by what the manual tells you. providing it is the manual that is for the radio.. that is why they make manuals for that particular radio a 1-1 to a 1-2 swr rating is really good providing you have no saturation on the internal filter. over saturation due to swr being set too high will eventually burn out the finals of a radio
i have delt with radio's for about 17 years now so i really suggest consult the users manual and always use only a authorized dealer for that particular radio just like my cobra 2000 i am not going to send it to a shop that just does radios i want a authorized cobra dealer ok i hope that this really helps ok please dont forget to give this solution a rate for me it helps me out so i can continue to help out others like yourself.
best regards
MICHAEL

Posted on Aug 23, 2009

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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

Ant light comes on when talking on cb


Check your antenna connections, Make sure they are clean and tight. Check your SWR, the built in swr meter is calibrated to turn the AWI light on if the SWR is 2.0 or higher. Check the coax wire for breaks, make sure it is not being crushed in a door,trunk lid etc.

Jun 25, 2012 | Cobra 29 LTD CB Radio

1 Answer

I have a cobra 29 ltd the red antenna light was coming on replaced the coax with 18' coax have Wilson 2000 antenna calibrated radio red light still coming on and and swrs not staying consistent when...


Best way to locate the problem is connect the radio to a Dummy load known to be good====if swr still comes on it is in the radio--if not in the antenna system.

Apr 28, 2012 | Cobra Radio Communications

1 Answer

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

My antanna light keeps lighting up. ive checked all conections and even put tin foil between all the conections from my cable threw my spring and my antanna


cobra 29 red light is normal but if you have two red lights that means that your swr is to high. take all that stuff you put on the antenna connection,get rid of the spring and adjust your antenna using an external swr meter. Get the swrs down around 1.5 and the second red light ,which is the AWI or antenna warning indicator,will also go out.

Jun 14, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 SWR, cal meter


Hello there:
Rule of thumb is go by what the manual tells you. providing it is the manual that is for the radio.. that is why they make manuals for that particular radio a 1-1 to a 1-2 swr rating is really good providing you have no saturation on the internal filter. over saturation due to swr being set too high will eventually burn out the finals of a radio
i have delt with radio's for about 17 years now so i really suggest consult the users manual and always use only a authorized dealer for that particular radio just like my cobra 2000 i am not going to send it to a shop that just does radios i want a authorized cobra dealer ok i hope that this really helps ok please dont forget to give this solution a rate for me it helps me out so i can continue to help out others like yourself.
best regards
MICHAEL

Aug 23, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 NW LTD Classic wont calibrate and red antenna light keeps coming on


The calibrate knob only calibrates the radios SWR meter, the owners manual will show you the procedure for that. If your ANT light is coming on, it is telling you that your SWR is to high, and may cause damage to the radio from reflected power. You should purchase an in line meter as the radios internal meter may be somewhat unreliable. You need to tune the antenna to the lowest SWR possible. Typically anything under 2.0:1 is acceptable. Radio Shack sells a meter for about $50, and is pretty accurate. Antenna mounting can also cause high reflection if it is to close to other objects. Google "CB antenna tuning" or read the instruction manual for you antenna, and you should be able to figure out how to properly tune the antenna.

Jul 07, 2009 | Cobra 25 NW LTD 40-Channels Base CB Radio

3 Answers

Cobra 29 ltd classic antenna calibration ??


You should not calibrate the antenna before you install it on the car!! the antenna needs to be calibrated on the vehicle that it is going to be on. Type of vehicle, different mounts, and many other variables can change the amount of reflection you will get.

j0hn9999 did a much better job but left some info out.

Take your SWR readings on channel 1, then on channel 40.... NOW, if your SWR is higher on ch 40 then ch 1, then your antenna is too long and it needs to be shortened. Refer to the antenna instructions on how to shorten the antenna.

If your SWR is higher on ch 1 then on ch 40 then your antenna is too short. You must lengthen the antenna. Again refer to your antenna instructions on how to lengthen your antenna.

You must calibrate each time you take a reading.

Make sure your doors and windows are shut when taking a reading

Make sure you are in an open lot when taking a reading as buildings, trees and other structures can cause reflection and give you an inaccurate reading.

If you adjust the length of your antenna on another vehicle and then put it on yours, the SWR will be off. It will need to be tuned again.

An external meter is better then the one in the radio, but will need to be hooked up in the vehicle you have the antenna on.

If you are not running any kind of power, or do not have a swing kit installed, and the radio is stock, the meter in the radio is more then enough to get a correct SWR reading.

Sep 27, 2008 | Cobra 29 LTD CB Radio

1 Answer

John Q president cb


Hi,

If by calibration, you are referring to the check if your antenna is tuned, below information may be of help.
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 adjusting
the "SWR CAL" control to the "CAL" mark on the meter face.
When in the "SWR" position, the standing wave ratio is measured.

SWR METER. Measures standing wave ratio of the antenna system.
Used to properly adjust the length of the antenna and to monitor the
quality of the coaxial cable and all RF electrical connections. If there is any
degradation whatsoever in any of the foregoing, due to humidity, salt
spray, vibration or corrosion, the SWR meter reading will rise, thereby
indicating that a problem exists.
To calibrate, switch to the "CAL" position, transmit by pressing the mike
switch, and adjust the SWR control to the "CAL" mark on the meter; then
switch to "SWR" position for the SWR measurement.

If however you are referring to the internal calibration or tuning of the transmit and receive sections, you would need several instruments/equipment such as RF generator (0-30Mhz with 1Khx modulation), Spectrum Analyzer, Modulation Scope, Dummy Loaded Wattmeter, Frequency Meter and some others. These of course are not readily available to the average user.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jun 12, 2008 | Cobra 29 LTD CB Radio

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