[Elecraft] K3 AGC Mod Test This Weekend

[Dennis]

This weekend I will be participating in the Stew Perry 160M contest, as 
will many of you.
For the contest, I've arranged to do some testing of the IMD Mod as put 
forth by N6KR in
a recent email.  I will have two K3s available, one with the IMD mod 
(2uf in parallel with the
.1uf already on the pcb) and one without the mod.  The audio from each 
will be run to
a sound card and one radio will be on the left channel, and the other 
radio on the right channel,
so it will be easy to compare the two audio streams.

K3s will be setup as follows:
Same MCU and DSP firmware
AGC parameters:
DCY  Soft
HLD   .30
PLS   Nor
SLP   000
THR   008
F       120
S       020
AGC as selected using front panel push button will be "slow".
All RxEq will be flat, ie. 0
Preamp Off
Att- haven't decided on this yet, but both radios will be the same.
Crystal Filter- 400Hz
Bandwidth setting- 400Hz
Headphone audio from an SO2R Box will be routed to the sound card for 
recording.
     The program I use to record the audio will give me 1-hour wav files.
RF gain adjusted to same number on both radios via N1MM Cat command
Main Antenna will go through K3(1) Ant 1 jack
K3(1) Ant Out will go to K3(2) Ant 1 Jack
K3(2) will have power reduced to zero and in TEST mode
K3(2) will also be put into transmit mode, but not keyed, when K3(1) is 
transmitting
     by using N1MM Cat commands {CAT2ASC TX;} CQ SP W1UE W1UE {CAT2ASC RX;}

By putting K3(2) into Tx mode when keying K3(1), I'm figuring the front 
ends on both radios
will not be damaged.  The antenna in use will be a 160M 4-square, so I'm 
confident there
will be plenty of signal for both rigs.  If there is a better way to do 
this, I'm listening.

So that I don't have to listen to 14 hours of audio to find some "mush", 
I will also be
keeping a log of the times when I do hear it.  I'm particularly 
interested to see if I can
actually hear the difference in audio from this reduction in IMD.

Comments as to my setup, and suggestions on other things that I may want 
to standardize,
are appreciated.

Dennis W1UE