On 7/1/2010 4:50 PM, CSM(r) Gary Huber wrote:
Even if you have a clean, low distortion signal, while using an amplifier,
you need to keep the output to 50W or so to avoid causing AGC compression in
the receivers of the other stations in the PSK-31 sub-band.
AH YES .... OK. I see I need to consider the other
end of the exchange. I thought you were trying to say
something more in your previous post ! Sorry if
I did not get it the first time.
Don't forget
that in PSK-31, many stations are simultaneously using a single 2500 Hz SSB
bandwidth with a recommended output of 30W. When there are QRO signals in
the waterfall, the receiver AGC typically causes the weaker signals to be
less likely to be decoded as their audio will be reduced.....
OK... that makes sense. Once again, there is more to
it than just having a clean signal out.
Few DX-peditions want to offer PSK-31
contacts for the very reason that many operators will not abide by the
self-imposed low power necessary to share a PSK-31 sub-band.
I am just now setting up my station to do digital modes, so
this is quite timely advice. I think I will order the ARRL
book on digital modes... clearly there is way more to this
than the local rabble let on - who say all need is a sound card,
a cable, and some free software like HRD...
I did not pay much attention to this when studying for the
license exam because I did not think I would ever get into
digital modes. But, just as with learning CW, I am now
attracted to the digital modes in order to be a
fully informed operator.
THANKS ============= K8JHR =======================
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