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Antenna deployment - impact on receiver range

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Old 01-19-2005, 05:24 AM
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aeajr
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Default Antenna deployment - impact on receiver range

Antenna shape and range

As I understand it, the antenna on a 72 mhz receiver should be approx one meter, or about 39 inches long. And I imagine the best reception profile would be to have that antenna deployed straight out.

Can anyone tell me the impact of maintaining the length of the wire but modifying the shape of the deployment?

For example, if I deploy it in a zig zag line for 15 inches to bury it inside a styrofoam model, how would that impact range? I am not cutting it short. Will this shape reduce the range significantly? So I need to take a 40" antenna and embed it in 16" of foam

What is the likely impact on range? Am I better off using some other shape? How much range am I likely to lose compared to leaving it hanging straight? 5%? 20% 50%?

This is a technical question about antenna shape and could be applied to any receiver antenna and has nothing to do with the brand or model of receiver.

Thanks to all the technical wizards out there who might be able to provide some insights.
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Old 01-19-2005, 10:38 AM
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LesUyeda
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Default RE: Antenna deployment - impact on receiver range

The technique that I have been using is to wrap the excess antenna around a soda straw so that it just about uses the full length of the straw, then put that inside the fuselage. Mine are not styrofoam, but builtup, and I have had no problems with range.

Les
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Old 01-19-2005, 02:03 PM
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Default RE: Antenna deployment - impact on receiver range

Tuning plays a very small part with reciever antennas, tuning is critical with transmiter antennas. The biggest factor with receive antennas is capture area. Too much won't hurt you at all, too little will decrease your range. I use the same technique as LesUyeda in my pylon racers and have never had a problem.
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Old 01-19-2005, 05:07 PM
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Default RE: Antenna deployment - impact on receiver range

I am not a technical wizard but I fly a Diamond Dust that has the antenna instaled in a plastic tube which makes a loop that is probably about 12 inches in diameter inside the wing, I have never had a problem with range checks or flying.
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Old 01-19-2005, 06:01 PM
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Default RE: Antenna deployment - impact on receiver range

Here is a detailed descripstion to the technique used by the pylon folks alluded to by Les and Nitrowoman:

http://www.darrolcady.com/Racing_Inf...ch/Antenna.htm
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Old 01-19-2005, 08:47 PM
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Default RE: Antenna deployment - impact on receiver range

Thanks for the input guys! Appreciated
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