Question about Cobra 29 LTD CB Radio
I need more info from you to help. What kind of antenna, what kind of co-ax and how long, also what type of vehicle is it on?
Posted on Oct 16, 2013
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Posted on Jan 02, 2017
SOURCE: high SWR
the problem is in the antenna cable. the lenth of a antenna cable must be divisable by 3. try replaceing cable with a 18 foot cable that should fix the problem.
Posted on Apr 22, 2009
Try checking the SWR's on channel 1, 20, and 40. The SWR's will change from the low channels to the mid channels to the high channels. The key is to make sure that the SWR's are around 1 or less at all three points. If the light goes out when checking one of them, then the problem is most likely the SWR's. If the light stays on when checking these channels, the issue might still be the SWR's but I would look at the grounding on the antennas. When holding the talk button on the mic and switching from calibrate to swr, can give a false reading. This is due to the calibrate circuit remaining open until you release the talk button. Take the SWR reading by releasing the Talk button on the mic after calibrating then pressing the talk button again after switching back to SWR. This will be the most accurate reading. From everything you described, I would be looking for a grounding problem with the antennas or coax, possibly even a rub though on the coax somewhere in the dash.
Posted on Dec 20, 2009
SOURCE: I have the cobra 29
Normally the swr should be set on the centre channel so if you have 40 channels you should set it on channel 20. This is because as you move away from channel 20 the swr rises slightly more for each channel away from the 20. If you set it on channel 40 you'll have twice as much swr on channel 1 more than if you set it on channel 20. If the swr metre shows 1:1 (i.e. doesn't move up at all) on channel 20 the rest should be ok since the antenna was designed for CB. You should however check that the needle showing reflected power doesn't go above 2.5
Posted on Jul 30, 2010
SOURCE: I just bought two new
After installing the antennas I normaly check for shorts. Place a ohm meter from the pin of the PL295 to gnd. If there is no short turn sel. to ch 40 and see where the match between it adn ch01.If SWR is HI on 40 the stingetrs or the top coil needs to be shorter, the opposite is for the lower chan.
If the HI swr on both ends of the spectrom it would most definately be bad connectors or could evenbe a bad ant. or both could be faulty.......Good luck
Posted on Oct 04, 2010
Sorry, but each rubber duckie is cut to a specific frequency, with the actual antenna windings sealed inside the rubber/plastic outer shell. Because of this construction, there is no adjustment feature.
Posted on Nov 11, 2010
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