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OSCAR 7 Telemetry decoding info



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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