[TenTec] TX Noise

[Duane Calvin]

Strictly speaking, if we're going to categorize, are they fully SDR's or
hybrids which contain SDR elements?  For example, are they dual conversion
superhet's with the 3rd conversion being to baseband SDR?  Just wondering
how we should classify all the various levels of SDR transceivers since
measurement techniques (or results) might differ based on the design. 

	73, Duane

Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com  




-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Jim Brown
Sent: Monday, July 28, 2014 6:27 PM
To: Discussion of Ten-Tec Equipment
Subject: [TenTec] TX Noise

Several guys asked about why no SDRs were included, not realizing that 
the K3  and KX3 are SDRs with knobs. To address their interest, I've 
added the other three SDR transceivers 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
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