Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site terak.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!mhuxn!houxm!ihnp4!zehntel!hplabs!hao!noao!terak!doug From: doug@terak.UUCP (Doug Pardee) Newsgroups: net.analog,net.audio Subject: Re: Frequency Shifter with no practical application makes funny noises! Message-ID: <209@terak.UUCP> Date: Mon, 3-Dec-84 19:11:06 EST Article-I.D.: terak.209 Posted: Mon Dec 3 19:11:06 1984 Date-Received: Thu, 6-Dec-84 05:45:07 EST References: <49@vax2.fluke.UUCP> Distribution: net Organization: Terak Corporation, Scottsdale, AZ, USA Lines: 24 Xref: watmath net.analog:100 net.audio:3645 > Hey...remember that article in EDN of October, 1982 about the audio > frequency shifter? I built one. > > Now, if somebody could just tell me what I can use this thing for... Sell it to local ham radio operators who operate Single Side-band (SSB) using transceivers without Receiver Incremental Tuning. Somewhere over 99% (no joshing) of all SSB operators mis-tune when listening, always in such a manner that the received voice sounds higher-pitched than it really is, usually by 50-100 Hz or so. When two hams are communicating and neither has RIT, there is inevitably a waltz whereby ham B tunes in ham A's voice a bit high-pitched, then when ham B is talking ham A tunes him in a bit high-pitched, etc. and they slowly walk up the band. (With a transceiver without RIT, changing the received frequency also changes the transmitted frequency). With the shifter, a ham can transmit his voice shifted high enough that the other ham will tune properly. Or even better, the other ham will tune so that HIS voice sounds higher-pitched to the ham with the shifter! Of course, a more direct but less interesting approach would be to simply use the shifter as if it was an RIT, shifting the incoming voice up to the desired pitch. Doug Pardee -- Terak Corp. -- !{hao,ihnp4,decvax}!noao!terak!doug