[RFI] New switching wallwarts - RFI potential?

[Martin Ewing]

Interesting about LF EMC, but no info on the new switching supplies.

I have done no serious tests, but so far have not seen any issues with
the new generation mini-switching wall-warts -- and they are really
proliferating around here.

73 Martin AA6E

On Tue, Jan 12, 2010 at 10:53 AM, Tim Duffy K3LR <k3lr at k3lr.com> wrote:
> Hi Pete!
>
> Here is a great paper on wallwarts.
>
> http://www.kongsfjord.no/dl/Antennas/Low%20Noise%20Active%20Antennas%20AC-DC
> %20Power%20Supplies%20II.pdf
>
>
> 73,
> Tim K3LR
>
> -----Original Message-----
> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
> Behalf Of Pete Smith N4ZR
> Sent: Tuesday, January 12, 2010 9:36 AM
> To: RFI List
> Subject: [RFI] New switching wallwarts - RFI potential?
>
> Recently, I have begun receiving a new type of wall-wart with various
> pieces of consumer equipment and, most recently, with my QS1R SDR.  Ones
> I've seen have generally been for 5 volts at 1 amp, are much lighter
> than the old ones, and I even got one that said Switching Adapter on the
> side.
>
> It also claimed, of course, to be FCC approved and UL listed, but no CE.
>
> These adapters are very attractive - in addition to the high current
> rating they are narrow, so that 6 of them would fit on a 6-hole surge
> suppressor, even without wall-wart-spaced outlets.  but I'm a little
> concerned - I don't think I'm hearing mine, but my shack is a long way
> from my antennas.
>
> Has anyone had occasion to test these critters?
>
> --
> 73, Pete N4ZR
> Visit the Contesting Compendium at http://wiki.contesting.com
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>
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-- 
Dr. Martin S. Ewing, AA6E
Member IEEE, URSI, AAS, ARRL
Branford, Connecticut