[Elecraft] Audio Improvements on a K2

[Don Wilhelm]

Lou and all,
As far as I know, the REAL filter flattening mod is the one that adds the
transistor switch and the 120 pf cap.
Yes, it only works in RX when the OP1 filter is selected.  It is not
active during transmit.

Removing C180 indeed can have some flattening effect, but the amount is not
significant as far as I have experienced.

73,
Don W3FPR

----- Original Message -----
>
> It is my understanding that removing C180 IS the filter flattening mod.
The 120 pf cap that is added is only switched
> in when the OPT1 filter is selected (always for TX and when OPT1 is used
for RX).  Right?
>