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?