[Elecraft] KX3-MIC & COMP Setting / Metering

[Ignacy]

I use a small electret mike form an old computer. Mic gain of 6  causes ALC
activity just below full scale. Reports indicated that COMP to the max (30)
produced punchy and undistorted signal.  When listening on K3, varying mic
gain from 4 to 10 caused very little difference in speech quality.

IM in KX3 strongly depends on the combination of power and voltage. See a
document in file section on yahoo KX3 site. Too much power at low voltage
can cause IMD of -20db. The effect of mic gain and compression on IMD is
much lower than that of voltage. Confirmed on P3. 

KX3 seems to be very sensitive to low voltage as far as efficiency is
concerned. For example, at 12V the radio draws 2.2A and produces 10W.  
About 38% efficiency and 16W dissipation. At 8V (NiMH under load), the radio
produces 2.5W and draws 1.8A, for 17% efficiency and 12 W dissipation.
Voltage and amp readings from KX3. 

Setting power to 5W at 12V, the radio draws 1.1A, for 38% efficiency and 8 W
dissipation. 

Not all of it is bad as many other  radios stop working < 11V. 

Ignacy, NO9E



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