<The biggest stations run (at least) two radios on each band, one "running"
(calling CQ) and the other in S&P mode (tuning up and down the band for
<multiplers).
<http://k9yc.com/Multi-Station.pdf provides an overview of all of the
mechanisms that can couple RF between stations.
<73, Jim K9YC ## I read the pdf. Mark is referring to FULL
DUPLEX...with TX and RX, simultaneously..on the SAME freq.Per your PDF,
that would require 2 x yagis, several hundred feet apart, with booms
parallel to each other. That only would work In 2 x directions. Ditto
with perhaps 2 x dipoles end to end...and several Hundred feet apart.BP
filters, stubs etc, dont enter into the equation. What about all
the other directions ?? ## what if a single vertical is used on... say
160/80/40m ...and a 2nd vertical / dipole for RX?? I find the
concept of full duplex on <5 acres, really hard to believe. The signal
intensity on ground wave for verts is intense. ## when I was a
commercial radio op back In 1974, the TX + RX ants were 10 miles
apart, hence full duplex on 400-500 khz cw. ## Buddy of mine was
75m mobile...coming over to my home. I just about did In the
front end of his poor Icom.I shut it all down, asap, when he was
1400 feet down the street. ## older ham, across the street from my
folks home, back In the 70s, would know asap when I was on the
air. Hiswatt meters, rf ammeters, you name it, would dance up +
down...with all his gear shut off. Jim VE7RF
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