November 6th 08, 04:26 PM
posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Jun 2008
Posts: 1,183
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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
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"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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