Vic K2VCO wrote :-
>This is apparently a problem with most or all
modern transceivers. On
our annual field day my club operates a CW and an
SSB station. We use
switched bandpass filters on both rigs and do our
best to site
antennas to reduce coupling. When both stations are
on the same band,
closing the PTT in the SSB station causes a loud
hiss at the CW
station. Interference from the SSB operator's actual
speech is quite
weak or nonexistent compared to the wideband hiss.
This year I heard
this from at least three different radios from all the
major Japanese
manufacturers. -- 73, Vic, K2VCO>
At our Multi-One/Multi-Two contest station, we
experienced a similar problem with the transceivers
available - the broadband hiss between CW
elements caused such severe interstation
interference on any band that it was impossible to
operate as a Multi. Stub and bandpass filters made
no difference.
The transceivers included IC-746Pro, IC-781 and
TS-2000 - antennas >300' apart.
My two K2s had not been considered because the
other members of the team refused to believe such a
small radio could be any good in contest conditions.
We now use the 781 as the 'run' radio, and a K2 plus
amp for the 'mult' radio - no interference (except right
on harmonics - very narrow) at 500w each.
We thought the 746Pro and TS-2000 had developed
faults - now I'm not so sure.
73,
Ken ZL1AIH (ZM1A, Auckland Contest Club)
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