Path: utzoo!attcan!uunet!know!cs.utexas.edu!news-server.csri.toronto.edu!utgpu!cunews!bnrgate!bwdls58!hwt From: hwt@bwdlh490.bnr.ca (Henry Troup) Newsgroups: sci.electronics Subject: Re: Hetro dining? Message-ID: <4393@bwdls58.UUCP> Date: 19 Sep 90 18:26:43 GMT References: <17660105@hpfcdj.HP.COM> <33896@cup.portal.com> Sender: news@bwdls58.UUCP Reply-To: hwt@bwdlh490.bnr.ca (Henry Troup) Distribution: na Organization: Bell-Northern Research, Ltd. Lines: 20 In article <33896@cup.portal.com> ISW@cup.portal.com (Isaac S Wingfield) writes: >Apropos of "superhetrodyne", there were also two other techniques >mentioned in old ads: hetrodyne (just a non-trademarked version of >"superhetrodyne"?) and "neutrodyne". Does anybody know what topology >that one is? I am not an Olde Pharte (tm) either - but I play one at the office :-) "neutrodyne" is an other term for "direct conversion" - you run the local oscillator at the carrier frequency, needing no detector. It's not as good as superhetrodyne, for two major reasons: - oscillator drift can kill the reception - only one neutrodyne receiver per 200 metre radius, becuase they swamp the broadcast signal otherwise. I built a regenerative receiver once... -- Henry Troup - BNR owns but does not share my opinions | No humor available today uunet!bnrgate!hwt%bwdlh490 HWT@BNR.CA +1 613-765-2337 | try again tomorrow.