[Elecraft] K3 IMD Rob Sherwood talk

[Craig D. Smith]

I was in attendance at Rob Sherwood's talk last night also.  It was quite
good and very informative.  It was not videotaped.  Would have been tough to
format it for U-tube, as was 2 hours with lots of audience interaction.

Having succeeded at least partially in getting more meaningful CW receive
measurements accepted (Close-in 2 KHz dynamic range), Rob's next focus
indeed seems to be reducing transmitted IMD from today's (more likely
tomorrow's) rigs.  This will be a design issue rather than a measurement
issue.  The class A rigs are definitely superior (by 10 to 20 db if I
remember his data correctly) in this regard, but of course there are the
very consequential power dissipation and efficiency issues which may
discourage their use by most operators.  Question is, can better transmit
IMD performance be achieved with careful design of class AB amplifiers?

Rob said that he had not yet measured the transmit IMD of the K3 but plans
to do so in the next week or two.  Should be interesting.

        73
                   ... Craig  AC0DS