[Elecraft] TX Noise Data

[Jim Brown]

On 7/28/2014 5:45 AM, N4OI - Ken wrote:
> Perhaps this is discussed somewhere in the thread, but I am surprised by the
> lack of Flex SDRs in the mix.  I would have thought at least a few would be
> there for PR, if no other reason.

PR?  What's that?

The K3 and KX3 are both SDRs with knobs. I'm guessing that you mean SDRs 
without knobs.

My interest is primarily contesting, the subject was radios for 
contesting, and rigs like the Flex products have made little headway in 
the contesting community.  I know of only two guys contesting with Flex 
radios . One is K6TU, and the other is K6XN, who bought K6TU's older SDR 
that is new model replaced. No, I don't remember which models were 
involved.

However, several guys asked, so I've added all three SDRs that ARRL has 
tested to the plots.  I've also corrected a labeling error on one of the 
plots, added a plot of phase noise for a 500 Hz bandwidth, and added 
some text.  It's all still at k9yc.com/TXNoise.pdf  I suspect that these 
plots will make it clear why contesters aren't thrilled with these radios.

By all means, before you consider one of the Flex radios, be sure to 
study this work by Leif Asbrink, SM5BSZ.

http://sm5bsz.com/dynrange/dubus313.pdf

73, Jim K9YC