[RFI] UPS interference/Recommendation Request

Martin, AA6E martin.ewing at gmail.com
Sat Apr 29 08:00:50 EDT 2006

I am using a Belkin 1200 VA unit with no issues, 80 - 10 M, and a smaller
APC unit upstairs that is also OK.  On the other hand, I used to have an
older, smaller APC that was terrible.

In my limited sample, it seems that newer and more expensive units behave
better.  But be prepared for trouble with any UPS - or any switch-mode
consumer appliance.

Somebody ought to test some of these products (quantitatively, in the lab)
for ham use!  Part 15 & FCC are pretty weak protection.  It should be pretty
easy, compared with the ham equipment tests at ARRL.  A new mission?

73 Martin AA6E

On 4/28/06, Donald Chester <k4kyv at hotmail.com> wrote:
> Mine is an APC unit.  It generates a broad buzzsaw-sounding signal just
> below the 2.5 mHz WWV, but doesn't bother 160 or 75, or even WWV.
> On the other hand, my cable modem trashes the entire HF spectrum above
> about
>   about 7.5 mHz.  If I wanted to work 10m. I would have to pull the plug
> on
> it.   The interference is more intense as you tune higher in frequency.
> Don k4kyv
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martin.ewing at gmail.com - AA6E at arrl.net
President, Yale University Amateur Radio Club - W1YU

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