SWR and CB Antenna

[ResqFE]

I installed my Cobra 75WXST CB today and spent most of the day dialing the antenna in. Best I got;

Channel 1 was 4.0 SWR
Channel 40 was 3.0 SWR

Research saying SWR should be below 3.0 and below 1.5 for best results. Verified mount/frame grounds. Any suggestions???

Thanks

Sponsored

 

[macintux]

Those numbers are catastrophically bad. Don't try to transmit, as I understand it you'll probably fry your radio.

I would wager your antenna isn't properly grounded. Do you notice any static shock when touching your Jeep after measuring the SWR? I had bad SWR measurements and noticed shocks until I finally managed to grind off enough of the powder coating on the Teraflex antenna mount I used on my LJ.

Also be sure the feed line isn't looped tightly.

 

[Bearded_Dragon]

Where did you mount the antenna and is there anything next to it, like a hi-Lift jack?

 

[PaPasJP]

Looks like it isn't grounded well. Take a meter and check it.

 

[ResqFE]

Its mounted near the third brake light with no obstacles. I tinkered this morning and when I removed the antenna to pull in garage, was shocked. Buggin' the crap outta me but do agree its a ground issue, just not seeing it when I check it with my meter.

 

[macintux]

You might enlist your local ham club. Hard to find more antenna expertise anywhere else.

 

[Bearded_Dragon]

Its mounted near the third brake light with no obstacles. I tinkered this morning and when I removed the antenna to pull in garage, was shocked. Buggin' the crap outta me but do agree its a ground issue, just not seeing it when I check it with my meter.

Check the picture in this thread in regards to the antenna, mount, and isolator: http://www.wranglerforum.com/f40/swr-antenna-tuning-troubles-2274818.html

 

[Rusty Teeth]

Did you modify the length of the coax feeding the antenna, or patch cable to swr meter is not right wavelength.

Just a thought

 

[JASPER]

Make sure ground is good.. Thats number 1 culprit. I have the Cobra 75 in both my jeeps with no issues. both antennas are on on top of rear bumper make sure you grind away coating on bottom of hole.

Sponsored