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

[Henry Vredegoor]

A quick reply....

And forgot to send a copy to the list too....

73's 

Henry.


> -----Original Message-----
> From: Henry Vredegoor [mailto:henry_vredegoor at hotmail.com] 
> Sent: maandag 11 juni 2007 2:44
> To: 'Al'
> Subject: RE: [hpsdr] Analog Vs. Switching power supply for 
> OZY Janus...
> 
> 
> Hi Al, All,
> 
> Did you also do a comparison WITH the audio cables connected 
> and a 50 Ohm termination at the antenna input?
> Would like to hear/see the results.
> 
> 73's,
> 
> Henry.
> 
> 
> > -----Original Message-----
> > From: hpsdr-bounces at hpsdr.org 
> > [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of Al
> > Sent: maandag 11 juni 2007 1:19
> > To: hpsdr at hpsdr.org
> > Subject: [hpsdr] Analog Vs. Switching power supply for OZY Janus...
> > 
> > 
> > ***** High Performance Software Defined Radio Discussion List *****
> > 
> > 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
> > 
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>