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November 6th 08, 03:26 PM
posted to rec.radio.amateur.antenna
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HF Diversity reception ?
Henry Kolesnik wrote:
Space diversity is what they call it for microwave systems and they also use frequency diversity. I've not heard of polarity diversity used on commercial HF systems but I have used it quite a bit myself with a horizontal dipole and a 18AVT. The military and FEMA use a computer control systems to automagically establish links on various bands for a round tables, and switching to the best link whenever required. I can't recall the acronym but I hams have a PC based system. I've seen it in use at a swapmeet using Sunair transceivers. Does the Elecraft have a built in tone decoder? Hank wd5jfr "Dale Parfitt" wrote in message ... "Henry Kolesnik" wrote in message ... I know that Hallicrafters made a dual diversity set up and RCA used three AR-88s in a trioka, selecting the best signal with a tone decoder that switched in the best and let the other/s idle or squelched. I've heard that Collins used the R 390 (51J or 51S?) , and Hammarlund the Super Pros ( only 600s or others?). It seems like three antennas spaced about 1000 feet apart on an equilateral triangle was a 100% solution. Did the Brits use it a Bletchley? But I don't see anything these days and have to wonder if diversity reception was made obsolete by SSB or the news & financial services using wire for TTY. I also know that Telstar was the final nail. Was the primary use for RTTY or was it used to voice well as CW? Anyone have some real personal experience to offer? Thanks Hank WD5JFR I don't own one- but believe the Elecraft K3 can do diversity but woud require the 2nd RX option. There's space diversity (which you allude to) but also polarity diversity. Dale W4OP http://www.elecraft.com/ |
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