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
<div>-------- Original message --------</div><div>From: N1BUG <paul@n1bug.com>
</div><div>Date:05/20/2015 2:04 PM (GMT-06:00) </div><div>To:
RFI@contesting.com </div><div>Subject: [RFI] Line filters for VHF? </div><div>
</div>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
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