I think it is time to change the subject line (and I did). The original
question was about increased IMD with lower power supply voltages.
It has now morphed into the relative IMD at different power levels with
higher (normal) power supply voltages.
Whatever the actual IMD of the K3/K3S at any power level, the
information I have heard from contesters and DXers is that the Elecraft
gear is has lower IMD than most other transceivers. We have heard
testimony to that repeatedly from Field Day setups and DXpeditions where
there are multiple transceivers operating in close proximity to other
stations. When station A cannot hear anything interfering when station
B transmits, that is a good thing. Elecraft gear can do that while many
other manufacturer's transceivers cannot say the same thing.
What we do know is that higher power supply voltages provide better IMD
figures, and since the Elecraft gear is rated for up to 15 volts, we
will achieve better IMD performance if the power supply is cranked up to
provide a voltage just a bit below 15 volts.
73,
Don W3FPR
On 12/30/2015 6:52 PM, Fred Jensen wrote:
Ummm ... I don't think that was what was suggested at all. I read the
post to be an observation of a *relative* condition. All amplifiers
[at least that I've ever encountered] exhibit increasing distortion
near their rated power limits. I've always assumed that's why
distortion numbers are almost always accompanied by the power when the
measurements were taken.
My K3/100 is a K3/10 below about 15 watts ... the 100 W amplifier
switches out of the circuit. I think all that the post was trying to
point out is that, from 100 W downward, the distortion will decrease
*until* the KPA3 cuts out. At that point, the LP amplifier/exciter is
near it's max power, and it's distortion will probably be higher than
the values from the KPA3 operating just above that power. In any
case, absolute distortion from a K3/<anything> is still among the
lowest in the marketplace.
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