
                              =========
                              SpaceNews
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                         MONDAY MARCH 22, 1993


SpaceNews originates at KD2BD in Wall Township, New Jersey, USA.  It
is published every week and is made available for unlimited distribution.


* STS-55 SAREX LAUNCH! *
========================
With only a few days before launch, the SAREX team is preparing for what
promises to be the first of several SAREX flights planned for 1993.

The STS-55 Space Shuttle Columbia mission is currently scheduled to be
launched into a 28.5 degree orbit on Sunday March 21 at 14:52 UTC.
A 2.5 hour launch window is planned.  The STS-55 mission, designated SL-D2
(Spacelab Deutsche-2), represents the second in a series of dedicated
flights for Germany.  The primary goals of the mission are to perform
studies in materials and life science research.  A 9 day flight is planned.

The seven person crew on STS-55 includes ham radio operators Steve Nagel,
N5RAW, Jerry Ross, N5SCW, Charlie Precourt, KB5YSQ, Hans Schlegel, DG1KIH
and Ulrich Walter, DG1KIM.  SAREX operations planned on this flight includes
2-meter voice and packet.  The primary voice callsign will be N5RAW.
The packet radio callsign is W5RRR-1.

The 2-meter FM voice and packet downlinks for the SAREX station are on
145.550 MHz.

Uplinks are:        Voice                                Packet

Europe                144.80 MHz                        144.49 MHz
                144.75 MHz
                144.70 MHz

Rest of World        144.99 MHz                        144.49 MHz
                144.97 MHz
                144.95 MHz
                144.93 MHz
                144.91 MHz

Note: The crew will not favor any specific voice uplink frequency, so your
ability to communicate with SAREX will be the "luck of the draw."

For all operations, Earth stations should listen to the downlink frequency
and transmit only when the Shuttle is in range and the astronauts are on the
air.  Listen for any instructions from the astronauts as to specific uplink
frequencies in use during the current pass.  Also, listen to the uplink
frequencies before transmitting to avoid interference to other users.

In addition to the U.S. SAREX ham gear in the Shuttle mid-deck, an
additional ham radio station will be flown in the German spacelab module.
This station, designated SAFEX (for Spacelab Amateurfunk-Experiment),
includes a 2-meter FM downlink and a 70-cm FM uplink capability.  A dual
band (2-meter/70-cm) external antenna, mounted on the German spacelab
module, will be used for SAFEX contacts.  Payload Specialists Schlegel and
Walter expect to make a few scheduled contacts with European schools with
this equipment.

The externally mounted SAFEX antenna gives the SAREX team an opportunity to
compare the performance of the U.S. SAREX window mounted antenna to an
externally mounted antenna.  A special A/B antenna test is planned on
orbits 61 and 62 using the normal SAREX downlink frequency, 145.550 MHz.
During orbit 61 the crew will transmit using the SAREX window antenna and
on orbit 62 the crew will use the SAFEX external antenna.  Individuals in
the Southeastern U.S. are welcome to help participate in this test by taking
signal strength readings of the received signal for both orbit passes.
If the shuttle is well above your horizon (>10 degrees) for both passes,
see page 42 of the February, 1993 QST to learn more details.

The following represents the prelaunch Keplerian Element Set as generated
by Gil Carman, WA5NOM.

STS-55
1 00055U          93080.67000478  .00120200  00000-0  36300-3 0    49
2 00055  28.4697 233.5969 0003812 314.2100  45.8202 15.90487610    24

Satellite: STS-55
Catalog number: 00055
Epoch time:      93080.67000478 =====> (21 MAR 93   16:04:48.41 UTC)
Element set:     JSC-004
Inclination:       28.4697 deg
RA of node:       233.5969 deg          Space Shuttle Flight STS-55
Eccentricity:     .0003812             Prelaunch Keplerian Elements
Arg of perigee:   314.2100 deg         Launch:  21 MAR 93  14:52 UTC
Mean anomaly:      45.8202 deg
Mean motion:   15.90487610 rev/day              G. L. Carman
Decay rate:     1.2020e-03 rev/day*2     NASA  Johnson Space Center
Epoch rev:               2

[Submitted by Frank H. Bauer, KA3HDO, AMSAT V.P. for Manned Space Programs]


* OSCAR DOUBLE-HOP TEST *
=========================
Double-hop Test 28 March
using RS14/AO21 Mode B to RS10 Mode A

At approximately 2150 UTC on 28 March, a transatlantic double-hop
opportunity will exist for stations in the northeastern part of North
America, transmitting via RS14/AO21 Mode B and listening on RS-10 Mode A.
The RS3A command station will have RS14/AO21 in Mode B, Transponder 2, from
1700 to 2400 on that day.

A group of UK stations organized by G0NKA and G4CUO will transmit to North
America beginning at 2150 UTC, as indicated below.  North American stations
wishing to try should transmit before 2150, using an uplink between 435.100
and 435.110 MHz, LSB or CW.  Try to pick an uplink frequency not being used
by other stations.

North American stations please report your results (UK stations heard/worked
plus particulars) via packet to W2RS @ WA2SNA.NJ.USA.NA or via Internet to
w2rs@amsat.org.  UK stations please report results to G0NKA @ GB7DTX.GBR.EU.

Here is some additional information prepared by G0NKA:

CHECKLIST:

Set shack clock to GMT accurate to within 1 second.
Set uplink frequency for RS14 to a spot between 435.100 and 435.110, LSB
or CW.  To remain fixed throughout.

If all OK then GO. Slottime = 0 min 05 sec. (21:49:51 to 21:49:56)

TCA between RS10 and RS14 occurs at 21:49:51

              DATE       AOS       LOS      LAT    LON    DURATION
 RS-10/11  03/28/1993  21:40:29  21:49:56  41.4n  042.1w  00:09:27  SOUTHWRD
    RS-14  03/28/1993  21:49:51  22:05:01  35.8n  036.4w  00:15:10  NORTHWRD

    SEPARATION = 921kms Approx.

U/Link = 435.105 MHz
X/Link = 145.880 MHz +/- Doppler
D/Link =  29.374 MHz +/- Doppler

On this last pass it will not be possible to work both satellites at TCAsat.
However it looks possible for USA stations to TX prior to 21:49:51 using
RS-14, and to be RXed in UK from RS-10.  Then from 21:49:51 reverse the
procedure.  Also the TCA given above is not the true TCAsat, because at
True TCAsat only one satellite in in range of the UK.

We suggest US stations TX " CQ DOHOP de  xxxxx " pre  21:50 GMT, we listen.
           UK stations TX " CQ DOHOP de  xxxxx " post 21:50 GMT, you listen.

Reports in both directions to include RST + RX freq AT TIME, via packet
if possible for speed, to G0NKA @ GB7DTX.GBR.EU.

                   CW                                  SSB

Callsigns UK = G4CUO, G4ZHG, G3CAG      G6HMS, G7MUB, G4CUO, G4ZHG, G3CAG

     TX Freq.    Station    Mode          TX Freq.    Station    Mode
    ===========  ========   =====        ===========  ========   =====
    435.108 MHz   G7MUB     LSB          435.103 MHz   G4CUO      CW
    435.105 MHz   G6HMS     LSB          435.102 MHz   G4ZHG      CW
                                         435.101 MHz   G3CAG      CW
                                         435.100 MHz   G3IOR      CW

If we receive signals from US then we will vary our return to include where
possible the callsigns of stations heard, ie. " Wxxxx Kxxxx Dohop de Gxxxx ".

[Info via Ray Soifer, W2RS]


* FEEDBACK/INPUT WELCOMED *
===========================
Mail to SpaceNews should be directed to the editor (John, KD2BD) via any
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MAIL     : John A. Magliacane, KD2BD
           Department of Engineering and Technology
           Advanced Technology Center
           Brookdale Community College
           Lincroft, New Jersey  07738
           U.S.A.


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