[Elecraft] K3 in a cw pileup - needs work

[Wes Stewart]

Yes. 

For non-portable use how about a "K3 Pro" or "K3 MK V++" that clips a few circuit traces and has a daughter board that uses two or three filter slots to house a stout IF amp, an H-mode second mixer and a PIN attenuator before the DSP?  The one remaining filter would only have to be good enough to get rid of the image.

Just thinking out loud.

--- On Sat, 2/6/10, Geoffrey Mackenzie-Kennedy <gm4esd at btinternet.com> wrote:

Hi Guy,

The problem reported has the classic characteristics of in-passband IMD 
caused by a small dynamic range (IMDDR3) IF system, rather than being 
something caused by the AGC
 sub-system. Yes changing the AGC's loop 
characteristics will alter the effect, but the root cause is still 
non-linearity in the signal path. I suspect the second mixer.

Trouble is that large IMDDR3 IF systems can consume a lot of power, and low 
power drain by the K3's receiver was a design goal I believe.

73,

Geoff
GM4ESD