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Old Jun 09, 2009, 12:42 AM
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Joined Aug 2004
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Question
Passive signal radiator for 2.4 Ghz?

Some people that are heavy into AM listening have these. A separate antenna collects the signal from one or more antennas that resonate at the desired frequency, and then that signal is carried to an emitter near the radio reciever. Any ideas on using something like that for systems like Futaba and Airtronics where they only have the two antennas, unlike Specktrum and JR where they seem to hold the patent on spatial considerations regarding multiple antennae and satellite receivers?
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Old Jun 09, 2009, 02:49 AM
The reviewer
XJet's Avatar
Tokoroa
Joined Mar 2004
3,827 Posts
Passive re-radiators have been used in a number of (non-model) applications over the years and they do work reasonably well when set up correctly. Many years ago I was involved in the design, manufacture and installation of some UHF PRs that worked pretty well -- but they were in a fixed position, as were the receivers they fed.

Once you mount them on something that's moving you can actually cause as many problems as you create due to the multipathing and phase-delays induced by the coupling mechanism.

What you gain on the swings you may well lose on the roundabouts.
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