Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!umn-d-ub!cs.umn.edu!ux.acs!keith
From: keith@ux.acs.umn.edu (Keith MaloneyHuss)
Newsgroups: sci.electronics
Subject: radio interference while recording from phone line
Message-ID: <1067@ux.acs.umn.edu>
Date: 5 Feb 90 22:02:05 GMT
Reply-To: keith@ux.acs.umn.edu (Keith MaloneyHuss)
Distribution: usa
Organization: University of Minnesota, Academic Computing Services
Lines: 12

A while back, someone described a circuit that activated a recorder
or other device when a phone was "off hook".  Sorry, I can't remember
who posted this, but my question is:
When recording from the line using this circuit, I get a recording of
a local radio station on top of the conversation being recorded.  Is there
any way to remove this radio interference?  Basically, the recording tap
goes through two 0.01 uF caps and two resistors from line to microphone
input.  The phone line is not shielded, but I never hear the radio
interference on the phone itself.

Thanks
--keith