UHF Radio Interference with Dash Cam

Submitted: Thursday, Sep 15, 2011 at 18:34
ThreadID: 89040 Views:3504 Replies:3 FollowUps:3
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Hi guys

I have a ORION UHF100 receiving interference from a HD DVR Dash Cam on Channels 9 & 10. All other channels work fine.

At first I had the UHF radio plugged into the cigarette lighter socket, and discovered this nuisance when the DVR is powered on and recording. Today, I acquired appropriate wiring and fuses for direct connecting the radio to the +Terminal on the battery, and the -Terminal to the chassis. This made no change in the problem, and it doesn't matter if the DVR is running on its own battery or plugged into the car. It's obviously a frequency issue.

I need suggestions on how this can be resolved.
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Reply By: Member - Tezza Qld - Thursday, Sep 15, 2011 at 20:05

Thursday, Sep 15, 2011 at 20:05
Had problems with the 200 series landcruisers, when they first came out , with fitting uhf's
Problem was the aerial coax cable was run to close to the computer and thus problems were incurred when a transmission was effected.

Solution move the coax

Don't know what vehicle you have but hope this helps



Cheers Teza
AnswerID: 465124

Follow Up By: rancox265 - Friday, Sep 16, 2011 at 01:59

Friday, Sep 16, 2011 at 01:59
The coax is on the right side of the vehicle, tucked inside the door trim panels out of site; the radio receiver is at the driver's knee level on the console; the control panel is just above the Stereo unit and the DVR dash cam is located up top and just left of the rear view mirror away from the UHF and the coax.
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FollowupID: 739114

Reply By: Member - Jerry C (WA) - Thursday, Sep 15, 2011 at 20:14

Thursday, Sep 15, 2011 at 20:14
Hi rancox,

I would suggest that there is a problem with the DVR having excesive radiation levels, bearing in mind that the input sensitivy of the UHF will be in the order of 0.25 micro volts at the aerial input. If you have a manual for the DVR, does it give any specifications for nominal radiation levels to be expected or less than ?

Cheers, Jerry.
AnswerID: 465126

Follow Up By: rancox265 - Friday, Sep 16, 2011 at 02:05

Friday, Sep 16, 2011 at 02:05
Hi Jerry -

My suspicion is that you are correct. It is a "No Name" made in China dash cam I foolishly purchased off ebay! The user's manual is in 5 different languages incl. English, and instructions are pretty straight forward on setup and operation, but no specs.

It seems that I'll just have to make do for now until I get a better quality dash cam.

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FollowupID: 739115

Reply By: snoopyone - Friday, Sep 16, 2011 at 16:44

Friday, Sep 16, 2011 at 16:44
I am looking at one of these Not cheap but get good reviews

http://dod-tec.us/dod-gs600-car-camera-dvr-black-box-with-gps.html
AnswerID: 465191

Follow Up By: rancox265 - Saturday, Sep 17, 2011 at 18:03

Saturday, Sep 17, 2011 at 18:03
After extensive research they're all about the same, with the more expensive ones including GPS tracking, front and rear video recording and other features.

The one I got - I spent $90 on it from ebay, and it's just a basic HD recorder with audio. I had to go out and purchase a Nokia Phone battery for it because the seller was too stingy to include one, The audio & video quality is pretty good, has anti-shake built in and the suction cup to the windscreen is well built.

My complaint is that the frequency radiation is interfering with the FM stereo and the UHF Radio on channel 9. Is there a way to combat the issue>
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FollowupID: 739288

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