Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: Notesfiles $Revision: 1.6.2.17 $; site trsvax.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!inuxc!pur-ee!uiucdcs!trsvax!levy From: levy@trsvax.UUCP Newsgroups: net.aviation Subject: Re: IFF/SIF Modes Message-ID: <59200006@trsvax.UUCP> Date: Tue, 11-Dec-84 10:34:00 EST Article-I.D.: trsvax.59200006 Posted: Tue Dec 11 10:34:00 1984 Date-Received: Sat, 15-Dec-84 02:24:41 EST References: <1200006@uokvax.UUCP> Lines: 9 Nf-ID: #R:uokvax:1200006:trsvax:59200006:000:204 Nf-From: trsvax!levy Dec 11 09:34:00 1984 (from trsvax!levy) Mode 3 can be used with or without altitude encoding. Mode 1, I believe, is left over from an earlier system and only allows a two-digit squawk code. Mode 2 is used by the military.