Cobra 75WXST versus others in an 08 ? Antenna mount. Inverter noise. - Ford Powerstroke Diesel Forum
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Old 11-19-2011, 09:46 AM
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Cobra 75WXST versus others in an 08 ? Antenna mount. Inverter noise.

I have an 08 King Ranch CC F350.

I have a Cobra 75WXST. I can live with it if there isn't anything better.

I am wondering if any of the new radios ie Magnum 257HP or the new fancy Cobra 29 would work better in terms of transmitting or receiving better on the CB channels or if the weather channel reception (Cobra 29) would be better.

Does anyone have a real clean mount setup for the new Cobra ?

I have a Wilson Firestick, about 5 feet long. Would it be OK to mount it at the back of the roof on my crew cab. I was thinking of drilling a hole for the antenna right above the back row courtesy light. Is that a good location ?

I plan to mount a 1000 watt pure sine inverter to the back wall of the cab. Is it going to interfere with the reception ?

Thanks !
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Old 11-19-2011, 10:03 AM
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Dont think it will interfere with anything as long as its shielded properly ( I.E. good manufacturing) Where ever you mount it make sure you get a good solid ground. Then make sure the antenna is isolated from the mount itself, to protect you from noise. Cobra75 is fine, might need a peak/tune. Last but not least keep an eye on that SWR.
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Old 11-19-2011, 11:31 AM
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Quote:
Originally Posted by raptorsrock19 View Post
Dont think it will interfere with anything as long as its shielded properly ( I.E. good manufacturing) Where ever you mount it make sure you get a good solid ground. Then make sure the antenna is isolated from the mount itself, to protect you from noise.
What do you mean by keeping the antenna isolated from the mount ?
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Old 11-20-2011, 05:46 PM
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Is the ant mounted to the bedrail or frame or is it a magnetic base mount? If its bedrail mounted you should have a gasket or plastic washer to isolate the mount from the ant. It should be "sandwhiched" between the mounting base and where you screw the ant into. That way the only way contact is the coaxial cable that runs into the antenna itself. Lots of people leave this out and you will pick up noise. Hope that helps.
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Old 11-20-2011, 07:04 PM
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Now I am really confused.

I thought that the shield wire of the cable needed to connect, through the connector, to the ground plane, ie some flat metal surface and the center of the cable needed to connect to the antenna itself.

If one isolates the antenna mount totally from the rest of the truck, how is the ground plane formed ?

I am using one of these. (SM1L, 90 degree antenna stud.) I drill a hole in the roof and put it through from under the headliner. The rubber washer isolates the part on top of the roof from the roof itself, but the big hex nut touches the under side of the roof.

Is this wrong ?
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Old 11-20-2011, 07:47 PM
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That should be correct. The idea is to keep the ground and center pin of the cable from coming into contact. By doing that you are isolating the antenna.
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Old 11-23-2011, 10:23 PM
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cb=1970

please help im lost when it comes to this technilogy
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Old 11-24-2011, 04:27 AM
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Master CB thread
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