[hpsdr] picoPSU Noise Test - well, I still think they're cute.

[Ahti Aintila]

Chris,

Your 5-turn magnetic pick-up loop doesn't necessarily tell the whole
truth. It may be worse or hopefully better.

Actually, we are not so much interested in the near field internal
magnetic noise. That is not usually going very far and can be
protected by metal shield.  More serious are the conducted
differential and common mode noise voltages and currents that may
propagate along the cables and wires anywhere and even radiate like
any other electromagnetic transmission.

You will need good measurement setup to find the truth. However, the
EMC /RFI standards are usually interested only in frequencies above
150 kHz. We use our sound cards at frequencies below that where the
noise levels are not controlled by the standards.

Good luck and 73,
Ahti OH2RZ




On 09/06/06, Eric Ellison <ecellison at comcast.net> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
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> Chris
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> Really hate to give up that 12 V DC option. I wonder if putting a case
> around this one would work? Sorry if this wraps, editor!
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> http://www.mini-box.com/s.nl;jsessionid=ac112b801f438efd9b1affb841e1b825e2f726b949f4.e3eTaxiPc3mTe38MchaRch8Ne6fznA5Pp7ftolbGmkTy?sc=8&category=13&it=A&id=300
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> Thanks
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> Eric
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> ________________________________
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> From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of
> Christopher T. Day
> Sent: Friday, June 09, 2006 1:18 AM
> To: hpsdr at hpsdr.org
> Subject: [hpsdr] picoPSU Noise Test - well, I still think they're cute.
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> Not so good.
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> <
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> http://www.hamsdr.com/personaldirectory.aspx?id=316
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> The above is a picture of the test setup. I used 5 turns of #20 magnet wire
> left over from the PA-100 Filter Module, attached them to 6' of RG-58U coax
> through a bannan plug-to-BNC adapter, and draped the coil over the
> picoPSU-60-WI. The other end of the coax went directly into my SDR-1000.
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> <
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> http://www.hamsdr.com/personaldirectory.aspx?id=317
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> {If this is too big to download, I'll break it up.}
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> The above is the test result at 160m. Noise floor goes up 30db. Nuts. I
> could do more, but is there any point?
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>             Chris – AE6VK
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> P.S. – Any other ideas?
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