[RFI] Line filters for VHF?

[N1BUG]

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 at 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
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-- 
Paul Kelley, N1BUG
RFI Committee chair,
Piscataquis Amateur Radio Club
http://www.k1pq.org