Thanks Gary.
I have a supply of Corcom and similar filters and they work great at
HF. They seem to do little to nothing at VHF. Thanks to the link you
provided I did find they have one model that is designed for VHF.
However since it costs several hundred dollars I could replace the
computer more economically (admittedly a crap shoot because the new
one could be just as bad).
73,
Paul
On 05/20/2015 03:36 PM, Gary K9GS wrote:
Hi Paul
I've always had good luck quieting switching supply AC line RFI
using the CorCom type filters. Always HF but there are different
models available.
You may even be able to find one that solders directly into the
power supply PCB.
Something like this:
www.te.com/usa-en/products/emi-filters/power-line-filters/intersection/high-performance-power-line-filters.html
73
Gary K9GS
-------- Original message --------
From: N1BUG
Date:05/20/2015 2:04 PM (GMT-06:00)
To: RFI@contesting.com
Subject: [RFI] Line filters for VHF?
I have been wondering about this for a while. AC line filters for HF
are everywhere. Most are characterized up to 30 MHz. Are there some
that work well at 147 MHz? I got tired of digging through data
sheets as they all seemed to be for HF.
At the moment I'm trying to stop RFI from a computer. When "sniffed"
with a detector the case seems quiet but the AC power cord certainly
is not. The first three Fair-Rite 0443164251 snap on cores helped
but adding more after that didn't. The line cord and associated
wiring in the building is still radiating noise.
Thanks,
--
Paul Kelley, N1BUG
RFI Committee chair,
Piscataquis Amateur Radio Club
http://www.k1pq.org
_______________________________________________
RFI mailing list
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http://lists.contesting.com/mailman/listinfo/rfi
--
Paul Kelley, N1BUG
RFI Committee chair,
Piscataquis Amateur Radio Club
http://www.k1pq.org
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RFI mailing list
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