[Elecraft] K3 Transmit IMD (Mic adj for alc)

wrmoore wrmoore47 at comcast.net
Wed Aug 6 16:21:30 EDT 2008



In light of the Sherwood presentation referenced in the thread about K3
audio, I haven't seen much comment on the spectrum analyzer plot of the K3
transmit IMD.  Is this still an artifact of the (now fixed) firmware error
mentioned by Eric earlier in this thread?

> The K3 firmware used for the original QST review did
> not turn off the
> K3's RF speech compressor clipper even when the
> compressor was set to
> zero for their TX IMD two tone test. This resulted
> in a significant
> increase in measured TX IMD when using an external 2
> tone source. We
> corrected this in a firmware update last month.

Or is this a currently existing situation with the K3?  I'm so from an
expert on these things that I hesitate to even ask, but it sounds like
Sherwood is saying the K3 is a "bad neighbor" in transmit IMD, and it looks
like it from the plots he provides.  

73,
Randy, KS4L
K2 #337
K3 on order :-)
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