Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucselx!petunia!news
From: jdudeck@polyslo.CalPoly.EDU (John R. Dudeck)
Newsgroups: comp.sys.laptops
Subject: Re: T1000SE Radio Interference
Keywords: Toshiba modems
Message-ID: <26990ca5.6962@petunia.CalPoly.EDU>
Date: 9 Jul 90 23:00:53 GMT
References: <22870@megaron.cs.arizona.edu>
Organization: Cal Poly State Univ,CSC Dept,San Luis Obispo,CA 93407
Lines: 26



In an article schatz@cs.arizona.edu (Bruce Schatz) wrote:
>I have a T1000SE laptop with the built-in 2400 baud modem sold directly
>by Toshiba.  Often when dialing, I find I can hear radio music in addition
>to the dialing tones.  This radio interference stops after the modem CONNECTS
>but then causes considerable noise on the line (random characters appearing
>on the screen though not interpreted).  I live in a house and the immediate
>neighbors are not likely to be playing a radio.  Has anyone else experienced
>this difficulty and if so are there known solutions?   Thanks.

Are you located near an am radio transmitter?  The music you hear is being
picked up by the phone line acting as an antenna.  This sometimes can happen
at a long distance, though usually within a mile or so of the tranmitter.
(KFI in L.A. can sometimes be heard on telephones 40 miles away!).

I don't know what can be done about this.  It partly depends on whether
the detection of the rf signals converting them into audio is occurring
within the modem or elsewhere in the phone line.  I have never heard of
a commercially available rfi filter for phone lines, but this is the sort
of thing that ham radio operators fiddle around with all the time.

-- 
John Dudeck                                 "I always ask them, How well do
jdudeck@Polyslo.CalPoly.Edu                            you want it tested?"
ESL: 62013975 Tel: 805-545-9549                               -- D. Stearns