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  #1  
Unread 25th September 2014, 12:08 PM
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Default Multiple CB radios in the same vehicle

I'll be installing two more CB's in my Jackaroo soon and was wondering if there's any problems with running multiple radios in close proximity on the same channels?
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Unread 25th September 2014, 06:59 PM
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When using my handheld and in-car CB on the same channel I can get feedback. When on different channels my handheld seems to interfere with transmission from my in-car.
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Unread 25th September 2014, 10:04 PM
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Why would you want 3 CBs in the same car?
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Unread 25th September 2014, 10:37 PM
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As I understand things, the channels are all side bands. The carrier signal frequency is the same for them all.
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Unread 26th September 2014, 12:21 AM
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shouldn't be a problem, if you make sure your using good quality braided coax, good aerials and they are positioned so as not to reflect off of each other. What are you thinking of a uhf a 27mhz and an hf?
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Unread 26th September 2014, 01:45 AM
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^ hadn't thought of them using different bands ...

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Unread 26th September 2014, 02:19 AM
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I'll be installing one in the boot, for use when I'm cooking or otherwise unable to get to the drivers section radio, and another radio for the back seat, because that will be turned into a storage section and will have a cargo barrier stopping me from reaching the front and rear radios. I'm going to install a GME TX3100 and GME TX3500 with GME antennas, 6.5DB, how much interference can I expect?
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Unread 26th September 2014, 03:19 AM
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A bit, spacing them is the easiest way to aviod most reflection, so say one on the front of the car one high off the rear of the vehicle opposite side.

Why not just buy another couple of hand pieces and wire them in? the control box would be pretty simple, or just put them all in parallel and make sure no ones ever using more than one.


There's also just putting them all on the same aerial through a uhf splitter. that's a little more stuffing around to do right though, as you'll need a specialy auto switch or multi-position remote switching unit. Which is still as reasonably simple control box to make. wiring is a ***** to run tho as there's alot more of it. plus each switch would need to go to a dummy load when not on an antenna.

Last edited by idw; 26th September 2014 at 03:25 AM.
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Unread 26th September 2014, 03:58 AM
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So if I space the antenna out the interference will be reduced?
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Unread 26th September 2014, 04:06 AM
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Follow IDWs advice on the multiple hand piece if you insist on having 3 transmission stations in the 1 vehicle. Better yet buy a 5W handheld unit and clip it to your belt when you're not at the helm, that way you can remain in contact even when nature calls or for some reason you had to leave your passenger at camp or in another vehicle.
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