[hpsdr] Analog Vs. Switching power supply for OZY Janus...

[Al]

I have been running Ozy/Janus with the SDR-1000 and noted the discussion 
of spurious signals when connected to a PC supply..   I would like to 
offer that all PC supplies are not created equal. I recently completed a 
comparison test of PC supply vs. analog bench supply and see no 
significant difference in the resulting noise floor, number of spikes or 
their amplitude.
 Test Conditions.
      Janus modified with 1K gain reduction resistors installed ( per 
KX2O suggestion). Sample rate = 192 Khz.  All analog cables disconnected 
from Janus.  Parallel control cable connected to SDR-1000. USB cable 
connected to computer.
PC Supply was a CODEGEN 200X1 (300 watts).
Bench supply was a Heathkit IP2718.
   
Screen shots available on request..

AL, K0VM