Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!netsys!vector!telecom-gateway From: denber.wbst@xerox.com Newsgroups: comp.dcom.telecom Subject: Re: Praise the Lord and Pass the RF Filters Message-ID: Date: 26 Jun 89 21:14:00 GMT Sender: news@vector.Dallas.TX.US Lines: 32 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 215, message 2 of 8 "But an FM station? Not so fast. FM transmitters maintain a constant amplitude, so if you "detect" them with a simple rectifier, you won't get anything but perhaps a steady DC voltage. " Uh, this wouldn't perhaps be slope detection, would it? Although the amplitude of the signal is constant, if you tune your AM radio right to the edge of the FM signal, you can pick up the change in amplitude caused by the frequency deviation at that point as the carrier is modulated. I've heard FM transmitters on AM radios. It isn't pretty, but it works. "if you don't have an FM radio, you can *still* listen to us: just turn on your television set and tune it as far above Channel 6 as you can..." The channel 6 sound carrier is at 87.75 MHz., or right at the bottom edge of the commercial FM band in the U.S., so this isn't too surprising (back in the days when you could still "tune" a TV set). Oddly enough, we get the Voice of the Lord at home on our phones too, from a nearby 10 KW AM station. They have a great ploy when you call them - "Well, our telephones are right *next* to the antenna, and *we* don't have any problems." There's only one theing more annoying than RFI - that's "music on hold". Yech! Listening to music over the phone is like listening to, to, well, music over the phone. And someone else's choice of music at that. Like maybe I don't *like* the E-Z listening version of "Stairway to Heaven". Maybe I'm *already* listening to something else on the radio. Give me a break. - Michel KB2BQ