RFI and Radio Shack Telephones

PaulKB8N at aol.com PaulKB8N at aol.com
Sun Oct 15 12:51:31 EDT 1995

November QST has an interesting article on dealing with EMI/RFI problems by
WA6ISX. In the article, Radio Shack phones scored among those being least
susceptable to EMI/RFI.  Like many of you, I have a healthy skepticism about
RS and their products, but having had a nagging telephone EMI problem for
months, I decided it would be worth a try.  I bought the phone and installed
it, turned on the transmitter into a CQ loop on a dead band, and checked the
phone.  Nothing!  Only when I pushed the drive control and detuned the
antenna slightly could I hear a barely perceptable click in the background.
 Obviously, the wife is happy.

I then took the existing problem phone apart and internally installed 2.5uH
chokes in series with both lines, bypassed with .01mmf discs.  I had been
reluctant to do this previously for fear of cracking the case when I pried
the phone apart.  (The phone was now expendable!)  This phone is now as
bullet-proof as the RS phone.

I'm sure many of you have had similar problems. I've gotten tired of winding
endless external ferrite chokes without fully solving the problem. The
internal chokes work just great, but the RS phone (model 43-585) is an easy
and effective alternative.

>From Jan Seay <jans at muskox.alaska.edu>  Sun Oct 15 17:49:34 1995
From: Jan Seay <jans at muskox.alaska.edu> (Jan Seay)
Date: Sun, 15 Oct 1995 08:49:34 -0800 (ADT)
Subject: FT890AT in CW contests
Message-ID: <Pine.HPP.3.91.951015084858.18912B-100000 at muskox.alaska.edu>

Buy the CW Filter(s). (KL7HF)

On Sun, 15 Oct 1995, Paul Staupe wrote:

> I recently downgraded my station to an FT890AT.  I'd like to put in  
> a decent effort in SS and the 160 contests, but am wondering
> whether or not it's worth plowing $$$ into a CW filter for the '890,  
> or if the money would be better spent on some sort of external
> digital filter.
> Any suggestions?
> Please reply directly & I'll summarize.
> Paul WZ0V
> pstaupe at acs.uswest.com

>From Dr. Eugene Zimmerman" <ezimmerm at DGS.dgsys.com  Sun Oct 15 18:10:39 1995
From: Dr. Eugene Zimmerman" <ezimmerm at DGS.dgsys.com (Dr. Eugene Zimmerman)
Date: Sun, 15 Oct 1995 13:10:39 -0400 (EDT)
Subject: RFI and Radio Shack Telephones
Message-ID: <Pine.SOL.3.91.951015130902.685B-100000 at DGS>


I have a Radio Shack Model 43-587 fone in the shack - it has been 
absolutely bulletproof and even works well as a telephone!  Don't know if 
it is still made (it is about 7 years old) but it sounds like it belongs 
to the same family as your 43-585.

73  Gene  W3ZZ

>From Robert Penneys <radio at UDel.Edu>  Sun Oct 15 18:56:26 1995
From: Robert Penneys <radio at UDel.Edu> (Robert Penneys)
Date: Sun, 15 Oct 1995 13:56:26 -0400
Subject: new address WN3K
Message-ID: <199510151756.NAA14267 at strauss.udel.edu>

New e-mail address


radio at udel.edu

Frankford Radio Club, N.E.R.D.S.

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