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amsat247
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amsat247.txt
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1988-09-06
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Posted: Sat Sep 3, 1988 8:33 PM GMT Msg: IGII-3721-2779
From: VRIP
To: IS
Subj: ANS.247
SB ALL @ AMSAT $ANS-247.01
AMSAT Weekend News Summary
HR AMSAT NEWS SERVICE BULLETIN 247.01 FROM WA2LQQ
WARWICK, NY September 03, 1988
TO ALL RADIO AMATEURS BT
AMSAT OSCAR 13 operations continue on track. The current schedule should
remain in effect until September 21. After that, a new schedule will be
installed which will reflect the spacecraft attitude change which commences
September 19. The reorientation should take only a few orbits to complete.
This will be the first seasonally-related attitude change for AO-13.
On Friday, September 9, a special Mode L test will be performed to analyze the
effects of radar noise on the Mode L receiver. As previously noted, Mode L
receiver AGC levels have been up to -14 dB when the antenna is earth-pointing
(at apogee) even when there are no audible signals in the passband. The AGC
level falls to 0 dB (no gain reduction) when the receiving antenna is
off-pointing from earth and looking towards space. This is the case near
perigee.
On September 9, Mode L will be in operation throughout the entire orbit to
allow measurements to be taken. The Mode L transponder should NOT be used.
Reports from stations equipped with good 70 cm receiving systems and a
spectrum analyzer are invited. They should check the entire passband to
gather more information on the source of the noise according to DB2OS.
Telemetry reports on Mode L AGC levels, especially from Pacific basin
stations, are very much needed. Telemetry reports of the Mode L AGC and
transmitter power should be forwarded to WA3WBU as previously described or may
be relayed via AMSAT net stations.
No further progress on RUDAK has been reported but testing continues in hopes
of finding a way around the current impasse.
The AMSAT-NA microsat project took a big step forward in late August when
accurate models of the generic satellite passed a rigorous series of shake and
vibration tests. The tests subjected the microsat bus to vibration levels
much higher than AO-13 was subjected to. The tests were performed at Utah
State University in Logan and, according to W3GEY, were passed with flying
colors. Acceleration levels over 14 Gs in the vibration test and over 44 Gs in
the shock test caused no problems for the rugged microsat bus, W3GEY said.
The AMSAT satellite news nets debuted on Friday, September 2 on Modes B and L.
The Space Education Net will debut on AO-13 on Saturday, September 3. W8GQW
says AMSAT nets will appear on AO-13 regularly; weekly if satellite windows
allow. Watch these bulletins for times and dates. Downlink frequencies will
be 145.960 and 435.888 MHz for Modes B and L, respectively. Mode J users will
be accommodated on a downlink of 435.988 MHz. The SEN will use frequencies of
145.960 and 435.900 MHz according to K9PVW.
WA5ZIB says the first AO-13 ZRO-Test trial run will be September 24.
VK5AGR says AO-13 telemetry equations will be included in the telemetry stream
beginning September 5. The equations will be sent a few at a time over a
period of weeks.
NASA prediction bulletin 16 for AO-13 has finally got the correct ephemeris
for the satellite...almost. The orbit number should be 148 instead of 149
says G3RUH. G3RUH was recently qualified as an AO-13 command station, the
first from the UK.
Distribution of AMSAT bulletins via packet radio on AO-13 will begin on a
trial basis shortly. Initially FSK will be used. Later PSK will be added.
Finally, FSK will be phased out. The operating schedule will be announced
shortly.
AO-13 Mode S tests are expected to commence soon.
AO-10 is out of service for an indeterminate period due to poor sun angles.
The AMSAT satellite frequency guides are being mailed to all donors. If you
are eligible to receive one, you should have yours by September 15.
First Day Club certificate requests continue to arrive. All certificates will
be mailed out by September 30.
AMSAT has re-instituted its traditional orbit sponsor program for support of
operations by satellite users. AMSAT HQ has the details: 301-589-6062.
/EX
SB ALL @ AMSAT $ANS-247.02
AO-13 and FO-12 Ops Sked
HR AMSAT NEWS SERVICE BULLETIN 247.02 FROM WA2LQQ
WARWICK, NY September 03, 1988
TO ALL RADIO AMATEURS BT
Here is the AO-13 operating schedule currently in use. This schedule will
remain in effect until September 21 when a new schedule will be implemented.
Deviations from this schedule may occur to facilitate important engineering
tests.
*** S P E C I A L T E S T S September 9. Do not use the satellite! ***
Revised Operating Schedule: V3.1 19Aug88
+---------------------------------------------------------------+
| Mode | From | Thru | Remarks | Duration |
| |(Inclus)| (Inclus)| | MA Minutes|
|========|========|=========|====================================
| Off | MA 241 | MA 002 | Solar eclipse window | 18 48.3 |
| Mode B | MA 003 | MA 099 | | 97 260.2 |
| Mode L | MA 100 | MA 150 | Mode JL optional | 51 136.8 |
| Mode B | MA 151 | MA 240 | | 90 241.4 |
|--------+--------+---------+----------------------+------------+
| Mode S | | | Soon | |
| RUDAK | | | Testing; ops pending | |
+--------------------------------------------------+------------|
The omni antennas are enabled from MA 224 thru 032. According to G3RUH,
AO-13's attitude as of 20 August was BLON=182.8 and BLAT=-0.7. James says the
rate of change of the Bahn Coordinates due to natural movements of the orbit
is BLON +0.0 deg/day and BLAT -0.1 deg/day. On or about 19 September, the
attitude will be changed to BLON=210 and BLAT=+5 to respond to seasonal sun
angle changes says DB2OS.
Here is the FO-12 operating schedule for September as provided by JARL.
Mode Beginning
Date Time
JA 03Sep 0758
D 05 0201
JA 07 0623
D 08 0529
JA 10 0543
D 12 0150
JD* 14 0000
JD 14 0610
DI 15 0516
JD 17 0124
DI 18 0435
JD 21 0355
DI 22 0301
JD 24 0314
DI 25 0220
JA 27 0234
D 28 0140
*On September 14 from 0000 to 0204, telemetry acquisition will be done every 2
seconds and the mailbox function will be disabled. A QSL card will be sent to
those submitting telemetry data. Send to JARL HQ, 1-14-2 Sugamo, Toshimo-ku,
Tokyo 170, Japan.
JD = Digital mode
JA = Analog mode
D = All systems off
DI = Systems off except CPU and memory
The transponders will be off at other times. The actual operating schedule may
change due to unexpected situations such as variations in available power.
Mode JA Beacon: 435.795 MHz. Mode JD Beacon: 435.910 MHz.
/EX