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Unread 04-13-2014, 09:05 PM   #1
jrskihog
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Cb tuning

I was trying to tune my cb and 1st how important is it to be in an open area as I don't have an area with at least 50 feet with no obstructions. 2nd every time I put the meter to set and key up on Chanel 1 and turn the calibration knob to get it to set and then change the switch to rec I seem to keep getting different readings. Sometimes it's 1.1 and other times it's 1.7. When I go to channel 40 and I have the meter in fwd and key up I have a difficult time getting it to the set point. The needle starts to move up and the goes full scale and if I turn the calibration knob more it goes all the way to 0 and then to 3 and then full scale. I can usually get it to the set point or close to it. Then when I flip forward to rec I get a reading of 1.8 sometimes but most of the time I get a reading of around 2.5. I removed the antenna and checked the for a clean surface for good contact for ground and resanded just to make sure. Is there something I am missing? I feel that the output reading should be contestant. I have a cobra 75wx cb and a 4ft fire stick II with a 3" spring.

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Unread 04-13-2014, 09:08 PM   #2
Jerry Bransford
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First, just do all of your antenna tuning on ch 20. When it is at minimum SWR on 20 it will be as good as it'll get on 1 & 40 too.

Check the antenna mount's ground connection, it is critical to obtaining the lowest possible SWR. Are you using Firestik's Firering or conventional mount? Also, springs can make tuning an antenna more difficult in several ways, the least of which the spring makes the antenna electrically longer than can sometimes be tuned for.
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Unread 04-13-2014, 09:23 PM   #3
jrskihog
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Thanks jerry
I am using the Arizona rocky road antenna mount fora single antenna. http://www.arizonarockyroad.com/antennamounts.html
I also checked channel 20 and had a difficult time getting to get like channel 40 and it was around 2.1 iirc. I have also heard about the spring being a problem also.

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Unread 04-13-2014, 09:46 PM   #4
Jerry Bransford
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There is no detail on that page, photos of what the antenna is threaded into would help. I suspect your mount is inadequately grounded, the part attached to the Jeep requires a bare metal to bare metal connection.
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Unread 04-22-2014, 03:41 PM   #5
jrskihog
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I took the mount off and resanded and wire brushed and put together and now channel 1 is 1.1 and channel 40 is 1.4 channel 20 is 1.2 it looked a little rusty. Wouldn't have this if it wasn't for the puppy making me replace the cable.
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Unread 04-22-2014, 09:24 PM   #6
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I think the biggest problem especially on a jeep is most of the antenna mounts put the antenna's whether 2 meters or 11 meters (cb) way 2 close to the body and no ground plane is provided. If you put a mag mount antenna on the hood you get the ground plane effect from the metal in hood or fenders but also all the electrical noise from the engine. I agree a longer 11 meter helps 4 or 5 ft but without more metal under the antenna and good grounding of tailgate rear spare tire mounted antennas are tough to get swr down. I had a ARRoad ant on my 05 rubi. The only thing it did well was support the antenna that held my pirate flag. Without a good ground plane not just good grounding it is difficult to get swr down.
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Unread 04-28-2014, 10:00 AM   #7
jrskihog
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Is anyone else getting interference on the cb when it is connected to a AGM (diehard) battery? I thought I had the problem figured out but now when the jeep is running there is interference and it gets louder the faster you drive and makes everyone impossible to hear.
It's just frustrating everything worked fine till I replaced the coaxial cable and the battery and the cb was not used with the old cut coaxial (thank you puppy teeth) that was removed. I also don't remember the interference when I changed the cable a month before the battery it has been to cold to work outside till now end rant.

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Unread 04-28-2014, 01:32 PM   #8
Jerry Bransford
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Any noise present is only being reduced by the Diehard Platinum, it won't cause noise. Are you running aftermarket low-resistance ignition wiring or non-resistor style spark plugs? Is the noise a whine or more like static?
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Unread 04-28-2014, 03:57 PM   #9
jrskihog
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Quote:
Originally Posted by Jerry Bransford
Any noise present is only being reduced by the Diehard Platinum, it won't cause noise. Are you running aftermarket low-resistance ignition wiring or non-resistor style spark plugs? Is the noise a whine or more like static?
The noise is more static that gets worse with engine speed. I just find it odd that this static wasn't there before the battery was installed.
No not running any aftermarket ignition wiring or non-resistor spark plugs

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Unread 04-28-2014, 08:02 PM   #10
JPNinPA
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Start with cleaning and tightening battery connections and the other ends of the ground leads. Next make sure the radio ground is clean.
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