[Elecraft] K2/100 & AGC pumping

[Larry Lavery]

My K2/100 (#2897) works fine except for minor AGC pumping on CW and SSB. =
The AGC pumping can be stopped when:
1- the AGC is turned off
2- The amplifier is physically removed from the K2 but electrically =
connected.
3- The amplifier is mounted to the K2 but electrically disconnected.

My theory is that the amplifier's MCU is generating noise that is =
getting into the receiver. Has anyone experienced this or know of a fix?

background...
The K2/100 includes the KAF2, KSB2 and KNB2 options. It also has the 2nd =
XFIL mod.

The K2/100 was built with the KAF2 and KSB2 options and no AGC pumping =
was evident. The problem started after the KNB2 and 2nd XFIL mod were =
installed. Also, the sidetone was moved to 650Hz and the CW filters were =
re-centered around 650 Hz using Spectrogram.

tnx..
Larry, WW2J


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