RDF900 / Rangelink interference

Hi I am using Rangelink  (433mhz) and  a RDF900 (915mhz) on my quadcopter and every time I use them together my Horyzonhd camera servo twitches. I have the camera set up so I can control the pitch but it is not hooked up to the camera gimbal pins on the APM 2.6 so it's all manual with a separate channel. 

If I don't connect the RDF900 to the ground-station then everything acts as normal and vise versa, if I have it connected to the ground-station but have my transmitter off I get no camera twitch so it's obviously some kind of interference between the two.

I'm just wondering if it is a wiring problem or its as simple as getting some kind of filter for one of the two?

Here is a video of exactly what it looks like.

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