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A test with various loads will be the thing, many supplies get really
noisy under load.<br><br>
At 01:21 AM 6/10/2006, you wrote:<br>
<blockquote type=cite class=cite cite="">***** High Performance Software
Defined Radio Discussion List *****<br><br>
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<font face="Arial, Helvetica" size=2>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.<br>
<br>
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:<br>
<br>
< <br>
<a href="http://www.hamsdr.com/personaldirectory.aspx?id=318" eudora="autourl">
http://www.hamsdr.com/personaldirectory.aspx?id=318</a><br>
> <br>
<br>
The result is in the RTF (WordPad) file at:<br>
<br>
< <br>
<a href="http://www.hamsdr.com/personaldirectory.aspx?id=319" eudora="autourl">
http://www.hamsdr.com/personaldirectory.aspx?id=319</a><br>
> <br>
<br>
This time, I see no effect at all turning On the Feeder Supply and
picoPSU, albeit there is no load yet on the supply!<br>
<br>
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.<br>
<br>
Whew, that makes me feel a little better, at least until morning.
Comments?<br>
<br>
<br>
Chris
– AE6VK<br>
<br>
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Cecil Bayona<br>
KD5NWA<br>
<a href="http://www.qrpradio.com/" eudora="autourl">www.qrpradio.com<br>
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</a>"Windows the worlds most successful software virus"</body>
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