[Elecraft] K3 vs. HPSDR Mercury receiver

[Dave G4AON]

The explanation from the article is as follows:

"When noise pulses/spikes pass through a crystal
filter, the phase response of the filter
changes, depending on the noise frequency.
However, when noise pulses/spikes pass
through an ADC with a linear response, the
phase response stays the same, because the
ADC treats them in a linear manner."

While the K3 is "SDR", it also includes crystal roofing filters which 
the Mercury does not. My Perseus SDR (which also operates with a high 
speed ADC for direct decoding - no crystals or mixers) does deal with 
noisy signals better than my K3.

Next generation transceivers will not use crystal filters and mixers, 
they are already appearing and the performance is outstanding.

73 Dave, G4AON
K3/100 #80
-----------------------------------------
 >/ SDR where the authors compare a K3 with a HPSDR Mercury receiver and
/>/ explain why the SDR sounds better than the K3 (noise through a crystal
/>/ filter causing phase changes).
/
The K3 is also an SDR!

-- 
David Woolley