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Digital Sat. status on Feb.22



Firstly, the correction of Time Zone in "Digital Sat. status on Feb.21".

> AO-10  Feb.21  2001
>
>      (error)            (correct)
>    JST    UTC    --->  JST    UTC  
>    03:00  12:00  --->  12:00  03:00
>    04:05  13:05  --->  13:05  04:05
>    05:04  14:04  --->  14:04  05:04
>    05:35  14:35  --->  14:35  05:35


Digital Sat. status on Feb.22:

   KO-23 ... 435.175MHz  9600bps FSK : Only carrier
   KO-25 ... 436.500MHz  9600bps FSK : Not heard
   AO-40 ...2401.323MHz   400bps PSK : S2 Beacon
   TiungSat. 437.325MHz 38400bps FSK : Operational (Download only)


I tried to access TiungSat-1 38k4 for the first time.
I felt that the uplink was difficult to request transmitter
every 50 seconds with WiSP because of QRM in Japan.

Equipment :   TS790 + TRX4S + TNC31S (SYMEK)
           or TS790 +  IFD  + TNC31S (SYMEK)


Amsat-News report on TiungSat-1 as follows.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
TIUNGSAT-1
Uplink               145.850  or 145.925 MHz 9600 baud FSK
Downlink             437.325 MHz
Broadcast callsign   MYSAT3-11
BBS callsign         MYSAT3-12
Launched: September 26, 2000 aboard a converted Soviet ballistic
missile from the Baikonur Cosmodrome.
Status: Operational at 38k4 baud FSK

Chris, G7UPN, tells ANS that recently TiungSat-1 has been operating
at a data rate of 38k4. Data recovery at 38k4 is reported to be 
extremely good with efficiencies near 100%. The output power is at 
8-watts "which should provide a very good downlink," said Chris, 
adding "the downside is that with the high power transmitter operating,
the power budget is negative so we can't support continuous operation."

According to G7UPN, TiungSat-1 now requires the Amateur Radio station
to switch the downlink 'on' when the satellite comes into range. 
The way this works is for the ground station software to send a request
to the spacecraft to switch the downlink on. The spacecraft receives
this request and checks the battery voltage to see if it can support
the operation, and if it can it will activate the downlink.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

See the following URL to switch on TiungSat-1 registry with WiSP32.
 http://www.ne.jp/asahi/hamradio/je9pel/uo36inf2.htm


And I observed AO-40 S2 beacon frequency went down 11kHz by doppler
during 3 minutes before LOS.

AO-40  Feb.22  2001

   UTC       MHz(USB)  RS  MA
   03:52:20  2401.330  44  252
   03:52:50  2401.328  44  252
   03:53:20  2401.326  45  252
   03:53:50  2401.324  45  252
   03:54:20  2401.322  46  252
   03:54:50  2401.320  46  252
   03:55:20  2401.319  57  252
   LOS

Equipment : 29el.Loop + Pre.Amp + Down Converter + TS790
           (Maki Ele.) (GR-2400)  (Drake 2880)    (KENWOOD)

----------------------------------------------
Name : JE9PEL/Mineo Wakita, JAMSAT member
Mail : je9pel@jamsat.or.jp
URL  : http://www.ne.jp/asahi/hamradio/je9pel/
QTH  : Yokohama Japan, GL:PM95TJ
Date : Feb 22, 2001
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