My CB is ticking me off. Hard wired it to the battery since every time I plugged in my cell phone, laptop, sirius radio, inverter etc etc. The thing would start howling, now I have a new problem. Purchased a small 12v bunk fan recently. It feeds and amplifies the fan motor noise directly to the CB. GRRRRRRRRRRR
I have tried a couple different noise filters, and nothing even tries to block the noise entering the cb. Did I mention I even twisted the power leads to to the CB for shielding? What else can I try?
Mmmmmm kaaaay now what ^%#$%$ CB
Discussion in 'CB Radio Forum' started by Kansas, Sep 6, 2010.
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If it does go away, you need to locate the source(s). It can be creeping in via the Antenna, coax or both. My current setup will pick up RFI from other vehichle electrical systems passing buy...
To find the source, re-connect the coax and remove the antenna and check it. If it's still as loud as it was, it's probably the coax (poor shielding), if it lessens but is still present, it's probably a combination of antenna and coax.
You may be able to reduce the interference with an RFI Choke (google it).
If removing the coax doesn't improve the interference than you've probably got a ground loop somewhere. Hooking your radio directly to the batter is typically the best solution, but doesn't always eliminate the problem. Your battery connects to your frame where other items are also grounded, increasing the potential for ground loops. Trying different grounding locations for the radio may help. Keep the power directly to the battery and look for the absolute shortest distance from the radio to a good metal source and see if it helps... not garunteed but things to explore. -
its a grounding issue. you need to run flat braid ground straps on everything. Cab, frame, doors, everything. this will help immensely with interference.
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Start with grounding the antenna and then the radio itself.
Then work your way back to the battery box,
door to cab
cab to frame
frame to battery box
battery to battery box
Fresh charged drill motor and a handful of terminal connectors,12 ga wire and
about a dozen 5/16 self tapping screws
Use a round terminal connector and some 12ga wire,go from the radio mount screw across to your A pillar(behind the plastic there is steel)
example:
If you have a grab handle use a connector thats big enough for the bolt,use duct tape to hold the connector while you reinstall the plastic cover and handle.
There is only so much you can do,these new style trucks and their multiple ECM's
are always going to cause RF feedback. -
Will get to work on this sometime in the next few days and report what if I find.
This is on my Volvo, I think they have about the crappiest antenna mount locations on any truck in history. Currently using a perch mount that bolts up via the mirror mount. I suspect the antenna may not be getting half the ground it needs.
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