Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site watcgl.UUCP Path: utzoo!watmath!watnot!watcgl!dmmartindale From: dmmartindale@watcgl.UUCP (Dave Martindale) Newsgroups: net.ham-radio,net.aviation Subject: Re: SALYUT_7 SWLING Message-ID: <2384@watcgl.UUCP> Date: Tue, 20-Aug-85 18:48:27 EDT Article-I.D.: watcgl.2384 Posted: Tue Aug 20 18:48:27 1985 Date-Received: Sat, 24-Aug-85 00:25:51 EDT References: <3596@decwrl.UUCP> <163@bunny.UUCP> Reply-To: dmmartindale@watcgl.UUCP (Dave Martindale) Organization: U of Waterloo, Ontario Lines: 32 Xref: watmath net.ham-radio:3070 net.aviation:1895 In article <163@bunny.UUCP> epm0@bunny.UUCP (Erik Mintz) writes: >> >> The follow is the Keplerian Element Set an previously know >> frequencies use by SLYUT_7. >> [.....] >> >> less likely but possible >> 121.500 mhz >> 121.625 mhz >> 142.417 mhz >> 142.600 mhz >Several of these frequencies are in the aircraft band. > >121.5 is the civilian aircraft emergency frequency. I thought this was >by international convention. I would be very surprised to find anyone >transmitting routine messages on it. I certainly have never heard any. > >In fact, I thought that the whole band between 118 MHz and 135 MHz was >alloted to aircraft operations. Can anyone correct me on this? Perhaps the 121.5 access is receive-only? Or perhaps it does transmit on 121.5 when it is being used for search-and-rescue work? As I understand it, the SARSAT program operates by having a satellite pick up transmissions on 121.5 and rebroadcast them to a ground station (I don't know if any frequency change is involved) where, from the known position of the satellite and the Doppler shift of the received signal, the ground location of the transmitter is calculated. Anyone have a better understanding of it?