[hpsdr] picoPSU Noise Test #2 - not just a pretty face?

[KD5NWA]

A test with various loads will be the thing, many 
supplies get really noisy under load.

At 01:21 AM 6/10/2006, you wrote:
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>After the formal TeamSpeak session today, I got 
>into a discussion of my picoPSU noise test 
>results with Larry (K2LT) and Duffy(?). The 
>result probably will be that I send one of the 
>supplies to Larry for him to test with his 
>spectrum analyzer, etc.; he tests such things 
>for broadcasters professionally, but the 60W 
>version only arrived Wednesday and I want to 
>savor it a bit longer. Meanwhile, he suggested an alternative test.
>
>I’m using a SoundBlaster MP3+ for my SDR-1000 
>sound card. This is only a 16-bit box, but it is 
>USB and external to my laptop. Larry suggested 
>that I put it, as a better representative of 
>Janus, near the picoPSU and see what happens. 
>So, I put my SDR-1000 back on 160m, terminated 
>the input coax with a 50ohm dummy load to remove 
>sky noise and set the MP3+ on top of the picoPSU-60-WI. See photo at:
>
><
>http://www.hamsdr.com/personaldirectory.aspx?id=318
> >
>
>The result is in the RTF (WordPad) file at:
>
><
>http://www.hamsdr.com/personaldirectory.aspx?id=319
> >
>
>This time, I see no effect at all turning On the 
>Feeder Supply and picoPSU, albeit there is no load yet on the supply!
>
>The MP3+ is a quite inexpensive box. From its 
>weight, I would say its case is strictly 
>plastic; once I get the nerve to void the 
>warranty and open it up, I will check for 
>internal shielding, but I’m betting it’s minimal at best.
>
>Whew, that makes me feel a little better, at least until morning. Comments?
>
>
>             Chris – AE6VK
>
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Cecil Bayona
KD5NWA
www.qrpradio.com

"Windows the worlds most successful software virus" 
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