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Old 06-10-2011, 6:01 PM
Join Date: Feb 2008
Location: Sparta, New Jersey
Posts: 738
Default Cobra 29lx and Antenna set up

This Cobra 29lx is a very nice set. I am having problems with setting up an antenna. I already returned the cobra once for irregular readings and have the second unit. I have tried 3 Radio Shack antennas but the SWR seems to change depending on location. This may be a normal thing but not sure. I set up the calibration as per instructions on the cobra on channels 1,20,40. It seems like moving the car 10 feet can change the SWR readings which are set by the calibration by the Cobra. I can get great readings but they change. Than again sometimes the antenna warning comes on when it showing a great SWR and things should be fine. Cobra said to turn the pot for that warning up as its reading incorrectly. What should I do? Ron
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Old 06-10-2011, 11:05 PM
reedeb's Avatar
  Amateur Radio Operator
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Join Date: Sep 2006
Location: Dallas Texas
Posts: 773

Forget Radio Shack antenna [JUNK, JUNK, JUNK!! ] Get a K40 or Wilson antenna. BOTH are 1000% BETTER. IF you want to drill out the holes get a ball mount and add the best antenna a 102" steel whip..
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Old 06-10-2011, 11:51 PM
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I agree with reedeb. I wouldn't have a RS product if they PAID me.
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Old 06-11-2011, 12:41 AM
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Location: Hoffman Estates, IL
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I third (if that is such a thing) the motion. RS/Walmart/any big box store antennas are awful. If you want something small(er) and better quality get a Little Wil or K40.
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Old 06-12-2011, 5:33 AM
redneckcellphone's Avatar
Join Date: Apr 2009
Location: southern comifornia
Posts: 398

i first had a walmart mag mount. bad bad bad. then went to a wilson lil wil. much better. but after a few years of having it i realized i needed an easier antenna to take off while leaving the mag mount attatched so i went with the k40 range improved as well
Connor - WQND300
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Old 06-12-2011, 7:59 AM
Join Date: Dec 2006
Location: Oklahoma
Posts: 2,145

SWR changing with location/movement is absolutely normal. Everything around that antenna affects it. If the changes are fairly small, or if they change back to something you think is reasonable, then there's no problem. Every antenna will probably have to be tuned at least a little bit. Finding one 'right', right out of the box is unreasonable and you shouldn't count on it.
- 'Doc
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