In WVARA, we have very good success running several bands on the
same antenna at the same time using triplexers. We set up our
triband yagis parallel to each other so they are in each other's
low-gain area. We have been able to operate CW, SSB, and digital
on the same band at the same time.
The other things besides well-spaced antenna towers and the
triplexer that make this operation possible are using radios
with very good receivers and transmitters, currently only
Elecraft and Flex are used, and operating QRP. Since we have
scored in the top ten for the last 10 or so years, this is a
successful formula.
73 Bill AE6JV
On 10/10/19 at 4:44 PM, donw...@embarqmail.com (Don Wilhelm) wrote:
Bandpass filters at each station will help a lot, but they do
not have infinite out of band rejection.
There is still a huge benefit with single band antennas. My club uses both.
Last Field Day (3F operation) one station got on the air with a
multiband vertical, and all other operators jumped on that
operator to shut him down quickly! The multi-band antenna
radiated harmonics of the radio. Even though the transmitter
met the -43 dB harmonic required by the FCC, the proximity of
the multiband antenna to other antennas caused problems (that
station was not using a bandpass filter).
So for Field Day multi-station operation, single band antennas,
bandpass filters and transmitters with low phase noise are
important. We were not able to orient the antennas end to end
due to space considerations at the EOC site, so we had to
compromise on that, which makes the other factors very important.
I need to point out that as an experiment, a 2nd station used
an antenna on 20 meters separated from the main 20 meters, and
we were able to operate one on CW (K3) at the same time as the
other station (Icom) used digital and SSB modes. We had some
mutual interference, but it was minimal. The K3 did not
interfere much with the Icom due to the K3's low phase noise,
but the Icom did raise the background noise level on the K3.
-----------------------------------------------------------------------
Bill Frantz | gets() remains as a monument | Periwinkle
(408)356-8506 | to C's continuing support of | 16345
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www.pwpconsult.com | buffer overruns. | Los Gatos,
CA 95032
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