[Elecraft] K3 & ADAT ADT-200A by HB9CBU

[David Woolley (E.L)]

Philip Covington wrote:

> problem of the phase noise of the LO.   Even QSD based SDRs which use
> a DDS for the LO have worse phase noise (and spurs) than the crystal
> oscillator LO in direct sampling receivers like the Perseus or QS1R.

It seems to me that high speed A/D conversion is much more difficult to 
do accurately than high speed D/A conversion, so any degradation in 
converting the LO to analogue is going to be more than compensated for 
by that in converting a wideband signal to digital.

-- 
David Woolley
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