Subject: SATELLITE LISTENING
LISTENING TO A SATELLITE BY Glen 4S7GV
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There are many satellites orbiting the earth and one could listen to a few
should you know the frequency on which it is transmitting and the time it
will pass over our area. Some " passes " that are almost overhead could be
picked up for over twenty minutes. My antenna is the " Slim Jim " but if
you have a Beam antenna you can figure out the direction from which it is
approaching. If the Day time Pass is North/South, the evening pass will be
South/North. If you have a Tracking Type Beam with Azimuth and Elevation
Control the Signal will be strong and you can hear it for a very short
period from below the horizon.
The Satellites I listen to are the RS 12/13 and AO21, on the frequencies
listed below. Should you have access to a computer and if you know the
Keplarian elements for the particular satellites you can get a printout for
a couple of weeks. As I do not have access to one, I use the addition and
subtraction method i.e. if you know the orbital period you keep adding it
to the time you heard it coming over the horizon and continue for 13 such
orbits. Make sure when doing so you have not made a mistake on a digit e.g.
you picked it up at 0800 and the orbital period is 1 hour 45 minutes,
therefore the next pass will be at 0945 etc. You may hear two passes at the
most each time it appears. If it is a real overhead pass you may pick 3
passes which is rather rare.
RS 12/13 : Beacon on 29407 Up Passband 21,200 - 21250 (transmit)
Robot on 29451 Down Link 29,400 - 500 (listen)
VHF BEACON 145.820 MHZ
In one orbit it moves 26.241421. It takes 104 minutes per orbit or
1 hour 44.96568 minutes (on the brain developing guide 1 hour 45
minutes is good enough). Calculate daily and log the time accurately
so you can get the next day's pass. In one minute it moves
3.99999968
AO21 : Thanks to 4S7AVR (Noel) for introducing me to this satellite. He
spoke to me via it over a year ago and today April 7, 1994 he made a
contact with 9K2WA and they both wished me as I had no Up-link.
AO21 beacon on 145.820 Transpond on 145.987 FM
As I do not have a CW facility, I listen to it on FM Mode and it goes "kuch
kuch kuchach kach kach kach". With your Rubber Flex Antenna you can listen
to it in bed.
Its orbital period is approximately 1 hour 44 minutes 45 seconds. Per day
it does 13.74519804 orbits. Listen to 145.987 and you will hear Stations
on FM.
4S7AVR (Noel) broke in a while ago to say another FM Satellite AO27 has
just been launched but no parameters. I shall do it the hard way and pick
it up. If Noel lets me have the break down, I shall then have " THREE GOOD
FRIENDS SAYING CHEERIO " each time it passes Maharagama.
Continue to... MSG Sri-Lanka News 94/APR 4 / 5
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