Tom wrote:
Respectfully Dick 99% of people with test gear can't measure
more than 40dB down over the air, engineers or not. Even my
newer test gear with all sorts of digital processing and
signal storage does a poor job in making off the air
measurements unless the signal is booming in. It's actually
better to use a known good receiver than even high quality
spectrum analyzers.
Observers have to know where to look (they have to know your
VFO frequency and the tone frequency).
They also must have a quiet location and receiving antennas
comparable to other people using that area of the band.
Stuff generated at audio and processed through audio stages
and SSB filters belongs in an area with other signals
generated the same way and well away from weak signals. If
PSK was really all that good for dynamic range at moderate
bandwidth, you wouldn't see all the PSK users whining
constantly about people running more than 20 watts. The poor
typical dynamic performance is what requires everyone to
keep their signals near noise floor.
73 Tom
You may be correct Tom, however I doubt this criteria has been applied all the
other stations on
160!....the precautions that I took are more than adequate to assure a clean
signal on the frequency.
If you will note that I stated that the receiving stations were within 50 miles
of me and my signal was
quite strong as you indicated would be necessary
However the point of my post was that PSK can be made clean or dirty just as
SSB and CW and you find examples of that 160 almost every day. I work a lot of
PSK both on Mars and the Amateur bands and your statement that "all the PSK
users whining
constantly about people running more than 20 watts. " is not quite accurate.
In fact what you really see is someone not experienced enough to use receiving
filters and narrowing their bandwidth and the difference in signal strength is
a function of propagation rather than transmitting power.
And finally, the ARRL plan of putting the digital modes in the first 10 k of
the 160 band was a good move but should have specified narrow digital modes.
We certainly don't want something like A.L.E. down there... let's keep up the
dialogue and increase the quality of the digital modes... 73..Dick
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