> (SO2R does of course force a different strategic decision: which other band
> will you do your S&Ping on? Until someone works out the technology to S&P
> on the same band on which they're CQing. I'd bet someone is already doing
> but hasn't yet released their secret!) (I've done it in the ARRL DX
> but only while running QRP)
There is a long history of successful attempts to CQ and S&P on the same band.
I know at least one multi-multi back in the 70's had the ability to split up
20CW into two sections and let a station S&P on each. This was done with some
kind of crystal filters I believe.
If you have a couple of antennas spaced maybe 600 feet apart - with some
directivity away from each other (e.g., two beams with each one off the
side of the other) - you can easily operate on the same band with 100 watts
of power without much QRM. I have even done this with a KW when using radios
with robust front ends.
The one requirement for doing this is having some land. You can't do this on
a city lot. Another way to do it is to have a remote receiving location, which
is probably getting easier to implement everyday. However, this technology is
illegal for most contests.
Recently - I have been doing this on 160 meters, with a KW, using a RX loop with
the null pointed back at my TX antenna - with a spacing of about 800 feet. I
think it resulted in a 10 percent increase in my QSO total in the ARRL 160
contest last year.
73 Tree N6TR
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