Re: K3 in a cw pileup - needs work
Posted by
n7ws on
Feb 06, 2010; 6:37pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4526382.html
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 <
[hidden email]> 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
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