[Elecraft] KX3 "Full" SDR

[David Gilbert]

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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