[hpsdr] picoPSU Noise Test #2a - Looking good!

[KD5NWA]

Can anyone get those files? In my case it's downloading the web page.

At 12:18 AM 6/12/2006, you wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>I've done several things for this test.
>
>1) I've opened the MP3+ box and verified that it has no internal
>shielding at all.
>
>2) I've put a 2ohm load on the 5V rail to give the PSU something to do.
>
>3) I've followed Ahti's suggestions:
>
>         a) Preamp at "High" [I wouldn't have thought that would matter
>much for audio card pickup, but can't hurt, I guess.]
>         b) Moved the MP3+ as far away from all power supplies as cable
>lengths would allow for the reference measurement.
>         c) Placed the open MP3+ on top of the loaded picoPSU for the
>noise measurement.
>
>
>A picture of the noise measurement set up is at:
><
>http://www.hamsdr.com/personaldirectory.aspx?id=325
> >
>
>The results are in the RTF (WordPad) file at:
><
>http://www.hamsdr.com/personaldirectory.aspx?id=327
> >
>
>This is looking _much_ more promising, at least until someone tells me
>how I'm fooling myself. I don't see any change at all.
>
>
>         Chris - AE6VK
>
>
>-----Original Message-----
>From: Ahti Aintila [mailto:oh2rz.sdr at gmail.com]
>Sent: Saturday, June 10, 2006 2:20 AM
>To: Christopher T. Day
>Cc: hpsdr at hpsdr.org
>Subject: Re: [hpsdr] picoPSU Noise Test #2 - not just a pretty face?
>
>Chris,
>
>Could you still do the following test:
>1. Use Preamp gain "High" instead of "Low" and antenna connector
>terminated 50 ohm.
>2. Place Sound Blaster MP3+ far away from picoPSU and any power cables
>and check the noise level.
>3. Move SB MP3+ on top of picoPSU.
>4. Any difference in noise levels?
>
>73, Ahti OH2RZ
>
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Cecil Bayona
KD5NWA
www.qrpradio.com

"Windows the worlds most successful software virus" 


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