[RFI] Telephone EMI Filter Sources?
EDWARDS, EDDIE J
EDWARDS, EDDIE J" <firstname.lastname@example.org
Tue, 2 Nov 1999 09:06:56 -0600
> -----Original Message-----
> From: Jim Idelson [SMTP:email@example.com]
> My neighbor and I were both VERY impressed with the ability of the Radio
> Shack Telephone Interference Filter to eliminate EMI on our phones. We
> were not, however, impressed with the $19.99 price tag for a single
> I have heard that these, or equivalent filters, are available at better
> prices elsewhere. Can anyone lead me to a good source? We will probably
> need 8-10 filters in total.
> Jim K1IR
[Ed-K0iL] Hi Jim,
I noticed your call is very close to mine on CW! Nice call.
I beleive K-Com (330-325-2110) is the manufacturer of the RS filter
(which only specs 3-30MHz coverage). At least they look identical inside &
out. The single line RF-1 sells direct in QST/CQ for 16.95, and they're
optimized for certain freq bands (like 0.5-3Mhz, 3-30MHz, 26-60MHZ, etc...).
You'd definitely save some bucks for the quantity you need. They also make
a coiled cord version and the RF-2 is the Hard Wired filtering to install
anywhere w/o modular connectors. And there's a 2-line version as well. (see
ad on pg 148 QST-Nov).
I've had mixed results using both the K-Com & RS filters. It
depends on the phone I think. A good combo seeems to be Rad Shack's $20
phone & either filter. It's cheaper than a "Bullet-Proof" phone.
Std disclaimer: I don't work for K-Com nor Rad Shack (although I did
20 yrs ago). Nor do I own any interest in either.
de ed -K0iL
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Ed Edwards Communications Engineer
Omaha Public Power District 2-Way & Paging Systems
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