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Old 11-21-2007, 05:59 PM   #61
GooseF22
Old Grey Beard Fighter Pilot
 
Join Date: Jan 2007
Location: Ft Wayne, IN
Age: 50
Posts: 571
Default Re: Futaba Fasst vs Spektrum radio link

In general terms, video signals are very dirty...meaning alot of side lobes, and the orientation of the ground plane under the antenna is critical. We use old circuit board for the ground plane.

The "hole" on a pole antenna, not only is directly above the antenna, but also directly below it, so we tried to place the ground plane so it shields the receiver. Still there are alot of trons floating around. And the Video 2.4 systems do not incorporate collision avoidance for the most part, as well as being broad instead of narrow bandwidth.

Thats a long way of saying, that the guy next to you running a 2.4 video could affect you, but his plane would have to be close to your plane, not his receiver. But.....the video systems use alot of power, so there are alot of variables.

In general I would suggest if someone is using a 2.4 downlink, keep your distance from his plane. If the video system was turned on first, so the DX could avoid it, it worked...

in the same scenario, the FASST system didn't fare as well, but that failure was on the same plane, and I don't know which system was turned on first, or what channel the video was on, but the plane was a loss.

With that in mind, a 900 mhz video is best OR a 900 mhz radio link.....

If its any consolation for 72, orienting the ground plane and separating the transmitter from the receiver has to be done for all the setups no matter on 72, 900, or 2.4 or the noise threshold can overwhelm the gain control of the receiver.

Last edited by GooseF22; 11-21-2007 at 06:06 PM.
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