The article itself is far less relevant to this discussion than the data
included in it. There has been lots of complaining in various contest
forums regarding the insidious wideband trash caused by rigs with bad
phase noise, and if you think that 30 to 50 db difference is not
noticeable at HF you either don't live in a very quite area (I do) or
you don't do much contesting where several hundred other stations are
operating at the same time on the same band.
Besides, what do you think happens during events like Field Day, or when
the ham three miles away is putting out that kind of trash??
I stand by my statement ... if everyone used FLEX SDR rigs (you do know
that noise power is additive, right?) we'd all have a major problem.
Dave AB7E
On 12/31/2013 11:57 AM, Bruce Beford wrote:
Many people seem to be either forgetting, or missing the point of Leif's
article (referenced below). The entire thrust was in the context of using an
HF transceiver as an IF rig with VHF/UHF/SHF transverters. Band noise on
those higher freqs is low enough that transmitted phase noise can be an
issue. This is especially true when running high power.
His summation was that the Flex-1500 is marketed as being perfect for
driving microwave transverters. His article outlines why this may not be
true. The FLEX SDR radios are not as objectionable on the HF bands, where
atmospheric and other noise dominates.
Bruce, N1RX
Based upon the published test results I've seen, if
everyone used FLEX SDR rigs nobody would enjoy SDR rigs ... or any
other rigs for that matter. Check out
http://www.sm5bsz.com/dynrange/dubus313.pdf for the details.
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