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

[Philip Covington]

On 6/9/06, Ahti Aintila <oh2rz.sdr at gmail.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> 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

Yes, please don't count these power supplies out yet.  I just would
not push them as the recommended power supply for the project.  When
we get some hardware to run, we can evaluate exactly how bad the
problem is and then make a better decision.

73 de Phil N8VB

 1149858685.0