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Re: [Paparazzi-devel] Interference w/ GPS

From: address@hidden
Subject: Re: [Paparazzi-devel] Interference w/ GPS
Date: Tue, 3 Jun 2008 21:54:23 GMT

I've never noticed any EMI emissions from a video TX but certainly the RF 
output has a tremendous effect on the GPS and everything else.  You could 
temporarily connect a high gain antenna to your TX and point it away from the 
GPS to verify that the interference is indeed from the TX itself and not the RF 

If the problem is indeed RF, make sure that your TX antennas are as far below 
the GPS ground plane as possible and try using a ground plane antenna on your 
TX (to reduce upper hemisphere transmissions) and/or increase the size of your 
GPS ground plane to reduce sensitivity on the lower hemisphere.

You may be getting ground reference interference as well that may require a 
separate, isolated power source for your video system.

Lastly, the analog video wire can emit HF noise - try coax, being careful of 
ground loops.  Other wires can be looped through ferrite rings to suppress 

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So we are using anywhere between 1 and 3 2.4 GHz video transmitters on our UAV's and have been getting a lot of interference. The problem is that the transmitter itself is leaking RF and interfering with the gps not the antenna (or at least i think so). Does anyone have any suggestions for how to stop this interference. Also does anyone know any high quality small transmitters for any frequency's that don't have as much signal leakage?

We have tried wrapping the transmitters in grounded aluminum foil with little to no success as well

Also does anyone know if you can buy a single transmitter that can broadcast on multiple channels simultaneously?

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