[Elecraft] Another P3 Observation

[Lyle Johnson]

  There has been some discussion on the reflector of late bout Tx mic 
equalization.

If you have a P3, you can set the span to +/- 50 kHz or less and easily 
see the results of such Tx equalization on other stations.

You'll often see two disinct patterns of SSB signals:

1) Those that look "sloped" in the spectrum.  On 20 meters, for example, 
many signals look like they peak 10 or more dB on the low low side near 
the carrier.  These are typically transmitters with no low cut in the Tx 
equalization.

2) Those that appear nearly flat-topped in spectrum (not to be confused 
with over-driving a transmitter amplifier stage).  These operators have 
equalized their systems to reduce the low frequency dominance of their 
audio.  The more equally filled spectrum makes pretty good use of the 
peak power capabilities of the transmitter.

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If you tune into these signals and listen to them, you will usually find 
that the "flat spectrum" speech has more dominance but still has good 
fidelity.

You can learn a lot with the P3 :-)

73,

Lyle KK7P