Try this from Radio Shack - you could cascade 3 of them for the ICE price:
AC Line filter
(150-1111A) Specifications Faxback Doc. # 38031
Type: .. AC Line Interference Filter (grounded 3-prong AC plug and outlet)
Freq.Range Attenuation
0 ~ 1k 0 dB
1k ~ 10k 0 dB
10k ~ 70k 10 dB
70k ~ 100k 40 dB
100k ~ 10M 40 dB
Specifications are typical; individual units might vary. Specifications are
subject to change and improvement without notice."
At 02:35 PM 8/2/2005, dgsvetan@rockwellcollins.com wrote:
>Martin,
>
>There are two problems: limited market (how many potential customers exist
>for the type of filter you seek), and varied applications.
>
>Some victims of RFI can do very well with the standard available filters
>from CorCom and others, as described by N8SS in another posting. Take a
>good look at the specs on those filters; some will actually have a fair
>amount of attenuation in all or part of the HF region, others just begin
>attenuation at or near 30 MHz. Power filters with "serious" attenuation
>below 30 MHz require more core material and larger values of by-pass caps
>than those intended for 30 MHz and above applications. So, there is a
>premium to pay for parts.
>
>Those who find the "good" ones at hamfests should count themselves lucky.
>Having worked for more than a decade at a company that made power line
>filters as one of its (industrial and government) product lines, I can tell
>you that the ICE filters are a very good bargain, indeed.
>
>As for the surge supressors with filters, I can't say that any of those do
>any good as filters at my QTH. However, a ham friend of mine in the
>northwest part of Iowa took a direct lightning strike to his tower and
>antenna system last month. All of his coaxial line and AC power line surge
>supressors were destroyed, but his gear survived. So, buy them as surge
>supressors and take the "filtering" with a bit of salt. If you check out
>the specs on those power strips that include a filter, the filters are
>intended primarily for the above 30 MHz region.
>
>For these special applications, the choice is pretty much either pay the
>premium price for serious filters (unless you get lucky at a hamfest or on
>e-bay), or get good at homebrewing.
>
>73, Dale
>WA9ENA
>
>
>
>
>
> "Martin, AA6E"
> <martin.ewing@gma
> il.com> To
> Sent by: rfi@contesting.com
> rfi-bounces@conte cc
> sting.com
> Subject
> [RFI] source for RFI filter
> 08/02/2005 10:49 cordset?
> AM
>
>
> Please respond to
> "Martin, AA6E"
> <martin.ewing@gma
> il.com>
>
>
>
>
>
>
>Hello All,
>
>I am tired of making improvised AC line filters by winding power cords
>through ferrite cores for 6 or 8 turns. They work ok, but they are
>unsightly and oversized, especially if you have a 3-wire cord.
>
>This should be a commercial product, don't you think? I've searched
>and haven't found one. There are good RFI filters for IEC power
>outlets and wired-in situations (e.g.
>http://www.corcom.com/Series/IEC/EASEBS/ ), but I want one that is
>compact and integrated with a cordset, so you just plug it in series
>with your equipment's AC cord. Even simpler: a box with the std
>recessed IEC male with filter on one side and a 3-wire female outlet
>on the other. (I doubt that any of the premium "surge suppressors"
>offer EMC filtering. Does anyone know to the contrary?)
>
>Yes, a box would be easy to make, but I want ready-made. It's the
>sort of thing that would cost you $12.95 at the hardware store if it
>were produced in volume. ICE has a box for $70+, but it is bulky and
>too expensive for my application.
>
>I'm thinking mainly of RFI egress (from consumer products to my
>equipment), but this product would serve for ingress protection also.
>
>Thanks for any pointers. Yes, I asked about this last year, but
>nothing came of it.
>
>73 Martin AA6E
>--
>martin.ewing@gmail.com
>http://blog.aa6e.net
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