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           CHARACTERISTICS of OSCAR-11 (U-O-11) (UoSAT-2)
   This gravity gradient stabilized satellite was designed and built by the
University of Surrey AMSAT Group and launched from the USA into a  circular
700 Km high Quasi-Polar 98 minute period orbit.
     OSCAR-11  has  no  transponders,  but  transmits  valuable  scientific
telemetry including 'WOD' (Whole Orbit Data)  of  many  of  it's  channels.
These include numerous temperatures, magnetometer readings,  radiation  and
micro-meteorite impact data. It also transmits regular bulletins of general
amateur radio and space interest.  It  has  played  a  useful  function  in
providing tracking data and  Doppler  positioning  to  numerous  scientific
expeditions inluding the joint Canadian  Russian  trans-polar  ski-trek.  A
voice encoder also provides spoken telemetry and uplinked messages.
   The transmissions are easily received  using  a  simple  crossed  dipole
(turnstile)  or  a  small  preferably  circularly  polarized  Yagi  to  any
conventional 2m FM receiver without modification.  A  CCD  Camera  provides
earth pictures
   Demodulators and computer  Programs  are  available  from  AMSAT-UK  for
directly translating the telemetry, WOD, pictures, bulletins etc.  directly
from the audio socket  of  the  receiver  or  via  taped  recordings  to  a
computer.
          FREQUENCIES for UoSAT-OSCAR-11
        Beacon         145.826 MHz (AFSK/FM)
        Beacon         435.025 MHz (AFSK/FM)
        Beacon         2401.500 MHz (AFSK/FM)
  QTH for AMSAT-UK:    Ron Broadbent, G3AAJ,
                       Secretary AMSAT-UK,
                       94 Herongate Road,
                       Wanstead Park,
                       London
                       E12 5EQ
                       United Kingdom.
  Reports of OSCAR-11 and it's educational use deployment are welcomed by:
                       UoSAT Spacecraft Laboratory,
                       School of Electronic and Electrical Engineering,
                       University of Surrey,
                       Guildford,
                       Surrey,
                       GU12 5XH
                       United Kingdom.
                                          Pat Gowen, G3IOR @ GB7VLS
21578.SAT
   Characteristics of SARA NASA Cat.No. 21578
   SARA is an acronym of 'Satellite Amateur de  Radio-Astronomie'  (Amateur
Radio Astronomy Satellite), a very small 19  Kg  satellite  constructed  by
radio amateur engineers of ESIEESPACE near  Paris.  SARA  was  launched  by
ARIANE with OSCAR-22 from ESA in Kourou into a solar-synchronous 100 minute
period orbit that passes over earth locations between 1000 and 1400 UTC and
again between 2200 and 0200 UTC local time. SARA's callsign is  transmitted
in ASCII in the first line as FX0SAT, as is the full QTH of ESIEESPACE.
   SARA's function is the study of eight channels of  radio  emissions  of
the planet Jupiter between 2 and 15 MHz,  which  are  unable  to  penetrate
earth's ionosphere. It transmits the data as 300 bauds digital  temetry  on
145.955 MHz FM +/- 5 KHz deviation,  which  is  receivable  on  any  2m  FM
receiver, preferably with a pre-amplifier and good cross polarized azimuth-
elevation trained Yagi, as the signal is not very strong.
   A 500 Hz sub-carrier contains the battery voltage  information,  defined
by V (in Volts) = 0.0148 x F, where F is the tone frequency received. A 220
Hz sub-carrier gives the structure temperature by T (in Deg.C) = 0.714 x (F
- 164.2) where F is the tone frequency received. The 50 Hz bandwidth  audio
filter circuit below from Hilburn and Johnson's  Manual  of  Active  Filter
Design will function between the receiver  audio  output  and  a  frequency
meter with R2 set at 2K for 210 HZ and at 350 Ohms for 500 Hz
                          ! !  C1 .03uF
                   ,------! !-------------------------,
                   !      ! !                         !
                   !                     R3           !
                   !                    330K          !
                   !          ,--------/\/\/\/--------o
                   !   C2     !                       !
                   !  .03uF   !         o +V          !
                   !   ! !    ! 2 ,\    !             !
 IN o--/\/\/\/-----o---! !----o---!- \  ! 7           !
      R1  16K      !   ! !        !    \!             !
                   !              !      \            !
                   \              ! 741    >----------o----> OUT
                   / R2           !       /  6
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