dna@dsd.UUCP (04/08/84)
Posted: Fri Mar 30, 1984 11:17 AM PST Msg: RGIE-1753-5069
From: MSWEETING
To: AMSAT
Subj: Uo-11 status
** UOSAT-2 Status Report ** Jodrell Bank 1725 30th March
I have spent the last few days up here at Jodrell Bank
Radio Telescope on the 85 foot antenna with a crossed-dipole
feed on 145 MHz listening for anything emanating from UOSAT-2,
both within a narrow 2.5 kHz bandwidth and +- 100 kHz
wideband. The receiver & antenna system have been checked
using UOSAT-1, the sun and Cassiopia and appear to be
performing well. We have got probably the best UOSAT-1 data we
are ever likely to see! The UOSAT-1 signal was peaking +75 dB
above the minimum discernable signal level here, so I feel
that we should be able to hear something if UOSAT-2 is
radiating anything on the nominal frequency. The wideband
signal performance is about 20 to 30 dB worse.
We also tracked OSCAR-10 and received good signal from out
at 42,000 km with the 145.810 MHz beacon peaking at +55 dB
above noise - the passband noise was also detectable at some
10 - 15 dB above the rx noise. Some good ssb signals were also
copied.
We have tracked UOSAT-2 last Thursday evening & Friday
morning passes without anything detected at all that can be
relied on - there were two bursts of carrier on the noise
level, each of about 10 seconds duration, but these could not
be identified positively and were most probably from other
amateur activities.
We shall continue with further tests on tonight's pass
(Friday) and, unless antthing interesting is heard, shall then
head home to Surrey and have a council of war. We do have
access to this facility until Thursday next week.
Roger & Neville have remained at Surrey to carry out
command functions whilst the listening tests are carried out
at Jodrell.
Well, now to think of the next theory!
Martin, G3YJO
Posted: Fri Mar 30, 1984 12:11 PM PST Msg: LGIE-1753-5783
From: PKARN
To: amsat
Subj: UO-11 Set #16
Whatever they're tracking is certainly consistent; AOS predicts between sets
15 and 16 are 110 milliseconds apart, and the straight-line distance
between the two predicted positions varies between 1 and 2 km.
Phil
Satellite: oscar-11
Catalog number: 14781
Epoch time: 84080.20398124
Tue Mar 20 04:53:43.979 1984 UTC
Element set: 16
Inclination: 98.2503 deg
RA of node: 142.6310 deg
Eccentricity: 0.0013623
Arg of perigee: 201.0828 deg
Mean anomaly: 158.9799 deg
Mean motion: 14.61823559 rev/day
Decay rate: 2.3e-06 rev/day^2
Epoch rev: 270
Semi major axis: 7062.509 km
Anom period: 98.507100 min
Apogee: 696.695 km
Perigee: 677.453 km
Beacon: 145.8250 mhz