Of course, 400W should be the average power of the amplifier, not the peak
power.
Splitting the power unevenly between the messages (in favor of the callers on a difficult path) may improve the peak to average
power ratio.
73 Alex VE3NEA
On 2017-08-20 16:15, Joe Taylor wrote:
Hi Rich, Ned, Alex, and all,
On 8/20/2017 2:15 PM, Alex, VE3NEA wrote:
Hi Ned,
Your picture of the future FT8 pileups of the top-ten DXpeditions is very
realistic but very scary. ...
... A 400 W linear amplifier will easily transmit 10 x 40W signals if it is linear enough.
Surely this is wrong.
If everything is linear, instantaneous voltage (not power) is additive. If a single constant-envelope signal has (voltage)
amplitude V and power P at some point in the transmitter, the addition of 10 similar signals carrying different messages can (at
some instants) be as high as 10V. The peak envelope power will then be 100P.
The transmitted waveform would no longer have anything like a constant envelope. Your 400 W linear would be OK for 10 x 4 W
signals, but not for 10 x 40 W.
A rate of 1000 QSO per hour, or more, may be possible, which will beat all
other Ham modes.
A scary idea, indeed!
-- Joe, K1JT
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