CB Antenna issues

[Erbleding]

Hello all,

Trying to install a CB in my 6 V positive ground Model A. I’m just using it for an upcoming tour, so I’m hooking the CB up to a 12 volt batter from my lawn tractor to avoid all the grounding issues. I issue I’m having is with the antenn. I’ve mounted a 4’ antenna to my rear bumper bracket and even run a grounding strap to the body, but the standing waive is through the roof. My buddy did the same mounting and he has perfect results. I’ve swapped out the antenna and the coax, but have the same results. Anybody had success with this? Thanks

 

[Synchro909]

I'm guessing here - electronics is not my expertise but wouldn't the car body be shielding the signal from that antenna? Receivers behind your car would probably communicate with you quite well but not so those in front.

 

[Pete]

A couple of possibilities.
You may have a faulty antenna. (bad coil or if fiberglass, broken internal wire)
You may have an antenna intended for a different frequency band. Many commercial and marine antennas look identical to CB antennas.
If it is a metal antenna, try wrapping a 4 inch BARE piece of stiff wire to the top and see if the SWR goes up or down. That should tell you if the antenna is at least working and that it is cut for another band.

Late notice. I see you tried another antenna with same results. Check your antenna bridge on a known good antenna before proceeding.

 

[ABento]

It looks like the grommets are not there, to isolate the antenna from the mount

 

[BradinFAT]

From the picture that you posted, it does noy look like you have the nylon isolating washer between the antenna and the bracket. With out that washer your antenna is grounded and will send your SWR to the max.

 

[Bill G]

From the picture that you posted, it does noy look like you have the nylon isolating washer between the antenna and the bracket. With out that washer your antenna is grounded and will send your SWR to the max.

I agree with the above. Check it with an ohm meter. Also, an antenna tuner might be in order, but may be overkill for your needs. Since your battery represents an isolated supply and you are grounding the antenna side, you might try strapping the negative side of the CB 12-volt battery to ground.