1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Cb in a bump Tuning help

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Old 03-29-2015, 06:57 PM
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Cb in a bump Tuning help

So who can help me figure out how to get my cb antenna firestick II 12' coax. i cant seem to get it to have a low swr, the system goes to cal no issue. I'm so confused
 
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Old 03-29-2015, 07:46 PM
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Does to this help?

How to use a SWR meter
 
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Old 03-29-2015, 08:30 PM
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I had a difficult time with my radio and getting the SWR down.

Give me some details and I'll try to help out.
 
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Old 03-29-2015, 10:40 PM
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ok so i have the antenna mounted behind the cab in the crossbeam of my stake body. with all of the 12' of antenna in the cab i can get a swr of 2/3 but not one. grounding the antenna or if I move the coaxal out of the way to where its going to be stored. ether under the headliner or down the side on the cab, or tucked around the roof I get the high ant light on . moving the ant out to the back of the truck is the same. I'm going to try to change the mount this week and see what happens. and add better coax
 
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Old 03-29-2015, 11:18 PM
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You do have the little plastic insulator ring in place right?

Bad coax can cause this problem. Bad antenna grounding.

Are the SWR better on channel 1 or 40? This will tell whether it needs to be longer or shorter. Have you tried tuning (trimming) the antenna yet?
 
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Old 03-29-2015, 11:29 PM
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I have the Tuneable Firestik II so no cutting. I'm thinking I need to ground the antenna as its not on a metallic surface. So i'll run a grounding wire from the mount to the cab. and see if that helps
 
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Old 03-30-2015, 05:39 AM
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TUNABLE CB ANTENNAS

Shouldn't have to run a grounding wire if the coax is good. Coax can be bad in two ways: kink/pinch, bent in too tight a radius which has deformed the spacer or bad connections to the coupler(s). Any fraying at the ends and you should re-terminate the cable. Used to be you could get the connectors at Radio Shack but now that they are gone try your local radio shop or Digikey.
 
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Old 03-30-2015, 05:33 PM
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I'm gonna run to the truck stop wensday and get a new mount and coax. hopefully one that will fit through the hole for the wire. might need to desolder and resolder the connections. to do it. right not my mount is a magnetic mount that i've secured to the frame of the stake body with home made clamps
 
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Old 03-30-2015, 07:13 PM
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