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Re: OSCAR 7 Telemetry decoding info



Martin,
    You're a wealth of information.  When I heard AO-7 was possibly back, I 
grabbed my copy of the Sat Experimenters Handbook.  The detailed 
information only went back as far as Oscar 8,  but the summery information 
of Oscars launched covered all the sats with beacon frequencies and 
modes.  The historical section of the book had many photos of AO-7 being 
constructed, and mounted on the launcher.  I wonder if the payload AO-7 
went up with is still working, HA.  If Amsat ever decides to have a 'VP of 
Information Services', you get my vote.  73

KB7ADL




At 01:27 PM 6/23/02 -0400, "Davidoff, Martin" <MDAVIDOFF@ccbcmd.edu> wrote:
>Re: AMSAT OSCAR 7 telemetry
>
>Thanks Pat (G3IOR)!
>
>AMSAT BB Readers may be interested in the decoding equations which follow.
>   [Please post any updates or corrections]
>
>Also,
>    IF
>         1.  Speculation that long term chemical changes in one
>             or more battery cells have led to increased cell
>             resistance enabling the spacecraft to operate while
>             in sunlight are correct and
>         2.  Reports indicating that beacons, telemetry systems,
>             and possibly transponders are operating
>    THEN
>         The prognosis for long term spacecraft operation are excellent.
>
>         If any of the old command stations are reading this I suggest
>that they step in and test the command system!
>
>         Finally, the orbit is very circular and very stable but some
>good orbital elements would help.
>
>
>
>CHNL    Parameter                       Measurement Range
>Calibration Equation
>----    -----------------               -----------------
>--------------------
>
>1A      Total Solar Array Current  0 to 3000 ma         I = 29.5 N  (ma)
>1B      +X Solar Panel Current  0 to 2000 ma            I = 1970 - 20N  (ma)
>1C      -X Solar Panel Current  0 to 2000 ma            I = 1970 - 20N  (ma)
>1D      +Y Solar Panel Current  0 to 2000 ma            I = 1970 - 20N  (ma)
>
>2A      -Y Solar Panel Current  0 to 2000 ma            I = 1970 - 20N  (ma)
>2B      RF Power Out 70cm/2m    0 to 8 watts            P = 8(1 - 0.01N)^2
>(watts)
>2C      24 Hour Clock Time      0 to 1440 min.          t = 15.16N  (min)
>2D      Battery Charge/Discharge  -2000 to 2000 ma      I = 40(N - 50)  (ma)
>
>3A      Battery Voltage         6.4 to 16.4 V           V = 0.1N + 6.4
>(volts)
>3B      Half-Battery Voltage    0 to 10 V                       V = 0.10N
>(volts)
>3C      Bat. Chg. Reg. #1               0 to 15 V                       V =
>0.15N  (volts)
>3D      Battery Temperature     -30 to +50 deg. C               T = 95.8 -
>1.48N  (deg. C)
>
>4A      Baseplate Temperature   -30 to +50 deg. C               T = 95.8 -
>1.48N  (deg. C)
>4B      PA Temp. 2m/10m         -30 to +50 deg. C               T = 95.8 -
>1.48N  (deg. C)
>4C      +X Facet Temp.          -30 to +50 deg. C               T = 95.8 -
>1.48N  (deg. C)
>4D      +Z Facet Temp.          -30 to +50 deg. C               T = 95.8 -
>1.48N  (deg. C)
>
>5A      PA Temp. 70cm/2m                -30 to +50 deg. C               T =
>95.8 - 1.48N  (deg. C)
>5B      PA Emit. Current 2m/10m 0 to 1167 ma            I = 11.67N  (ma)
>5C      Module Temp. 70cm/2m    -30 to +50 deg. C               T = 95.8 -
>1.48N  (deg. C)
>5D      Instrument Sw. Regulator
>         Input Current           0 to 93 ma                      I = 11 +
>0.82N  (ma)
>
>6A      RF Power Out 2m/10m     0 to 10,000 mw          P = (N^2)/1.56  (mw)
>6B      RF Power Out 70 cm      0 to 1,000 mw           P = 0.1(N^2) + 35
>(mw)
>6C      RF Power Out 13 cm      0 to 100 mw                     P =
>0.041(N^2)  (mw)
>6D      Midrange Telemetry Calib.  0.500 V                      V =
>0.01N(0.50 +/- 0.01)  (V)
>
>
>de K2ubc (Martin Davidoff)
>
>----
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