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Antenna mouting on CF fuse

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Old 11-09-2008, 05:08 PM
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Tim Green
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Default Antenna mouting on CF fuse

The FASST documentation says to mount the receiver antennas no closer than 1/2" from any carbon. The docs also state not to fix the antenna to the fuse if it's carbon or metal. And they also state that you have to mount the metal part of the antenna on the outside of a fuse, if it's carbon or metal.

I have a carbon fiber fuselage glider (carbon fiber is on inside surface of the fuse, with fiber glass on outside surface of fuse) into which I intend to mount a FASST receiver.

In light of the above, is it ok to mount the antenna such that each of them exits on opposite sides of the fuse, with 1/4" of coax on outside as well as all of the metal of each antenna on the outside of the fuse, and with both of the antennas taped to the outsides of the fuse?

Or, because the fuse is carbon fiber, and I'm not supposed to mount the antennas closer than 1/2" to anything carbon, do I have to make sure that the metal parts of the antennas are not only on the outside of the carbon fiber fuse, but also no closer than 1/2" to the fuse?
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Old 11-12-2008, 12:06 PM
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Default RE: Antenna mouting on CF fuse

The bared wire at the end of each coax cable is the antenna. They must be outside of the carbon fuselage, and they must be at 90 degrees to each other. One can stick out the side of the fuselage and the other out the top. Or have them stick out both sides towards the top so that they make a "V" that has the legs 90 degrees apart.

The recommended spacing would usually mean pushrods, so that an antenna would not be parallel and close to a pushrod.

Basically, though, carbon fuselages will be a problem with anything on higher frequencies, such as the 2.4 GHz band. Carbon is conductive, and anything conductive can block high-frequency radio signals. For best reception, use something other than a carbon fuselage, unless getting the antennas outside can keep them well-exposed to the transmitter. Remember, radio signals at this frequency are very much line-of-sight, so if there isn't a direct visual path from the transmitter antenna to the receiver antenna, you will very likely have reception problems.
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Old 11-12-2008, 09:22 PM
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Tim Green
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Default RE: Antenna mouting on CF fuse

Seems clear enough - thanks.
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