Path: utzoo!telecom-request Date: 22 Apr 91 17:57:15 GMT From: nanook@eskimo.celestial.com (Robert Dinse) Newsgroups: comp.dcom.telecom Subject: Re: Radio Reception on Telephone Message-ID: Organization: ESKIMO NORTH (206) 367-3837 SEATTLE WA. Sender: Telecom@eecs.nwu.edu Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 299, Message 9 of 11 Lines: 22 In article , lairdkb@mentor.cc.purdue. edu (Kyler Laird) writes: > A friend of mine has a problem with radio reception on his home > telephone. The FCC told him to use a choke. That's it!? He hasn't > tried this yet, but I'd like to know what his other options are. > Also, I'd appreciate knowing the theory behind this. I am fortunate enough to live close to a 50 KW AM stations transmitter tower and it has the unfortunate side effect of turning everything into a radio receiver. A couple of .001 capacitors from each side of the line to ground seems to work adequately for getting the RF out of the phone here. But another thing that can complicate the issue, the RF would never be detected and become audio if it weren't for something non-linear playing detector. As it happens, phones generally have clipping diodes across the receiver, the purpose of which is to keep clicks from blowing your ear-drums out, but they also tend to make good RF detectors.