Wayne wrote:
"In a prototype, we provided the time delay by recording the RTTY signal
on a tape and playing it back soon afterwards on a different tape head."

That is a technique used to add echo to a recording without a long audio
chamber or worse yet springs stretched between transducers.

Best regards, Richard Harrison, KB5WZI

In article ,
"Henry Kolesnik" wrote:

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



my icom 2820h does diversity, thou i really understand that in
a 'fm' uhf/vhf rig

I was sorta surprized that the flex radio has diversity, i mean
why not , but what i really wonder is if you had two nicely
spaced antennas aside from obvious a/b switching of the
antennas which you could do w/a coax switch i wonder how it would
or if it would be able to reduce noise both a) local and b) not
local




very interesting



as far as commercial, I work at a phone company we have a
cellular division and most all of our sites have very
complicated diversity systems built in , as most of the problems
we have are typically caused by multipath

on the same front data modems such as for example the (sierra)
airlink raven X evdo modem has a 2nd antenna port for rx
diversity ant the GSM models typically don't have it least not
that i ever saw

so diversity isn't dead but it's a best kept secreate sorta

ML wrote:
"So diversity isn`t dead----."

Either diversity or alternate routing is essential for high reliability
when using terrestrial microwave.

Best regards, Richard Harrison, KB5WZI