# OSCAR 7 Telemetry decoding info

• Subject: [amsat-bb] OSCAR 7 Telemetry decoding info
• From: "Davidoff, Martin" <MDAVIDOFF@xxxxxxxxxx>
• Date: Sun, 23 Jun 2002 13:27:03 -0400

```Re: AMSAT OSCAR 7 telemetry

Thanks Pat (G3IOR)!

AMSAT BB Readers may be interested in the decoding equations which follow.

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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