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John Hackman
If you can obtain a line-of-sight path between two sites, the 10 GHz
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gunnplexers provide a very nice method of bi-directional linking. They are by their nature capable of full-duplex operation. Add two receivers (30 MHz is reported to work - just crystal up both receivers to the same frequency) to serve as the receiver IF/detector strips. Obtain an AFC voltage from ONE of the receivers and run it back to the voltage regulator of its associated Gunn diode so as to AFC lock that site to the other site [do not AFC both setups - they'll end up chasing each other out of the band]. The Gunn diodes are modulated by providing audio drive to their voltage regulators. Voila! A reasonably simple bi-directional full duplex link. The two transmitters will be synched to each other, separated by the frequency selected as the IF. Now for the customary disclaimer ... this works in theory, and in somebody else's practice - I've never had my hands on two Gunnplexers to try it out, but various publications have reported it to work. With the ready availability of low-band Motorola and GE crystal-controlled mobiles, this should be simple to implement. ......John WB4VVA -----Original Message-----
From: Kevin Mitchell <sparc@...> To: repeater-builder@... <repeater-builder@...>; Repeaters@... <Repeaters@...>; RLC@... <RLC@...> Date: Wednesday, March 24, 1999 5:57 PM Subject: [Repeater-builder] 10GHZ Link From: Kevin Mitchell <sparc@...> |
