[amsat-bb] Re: AO-7 70cm beacon

[David Giles]

Hello again,

Another pass (2009-02-28 2225 UTC) and the 70cm beacon was on again. 
This time I used fldigi and worked out it was sending RTTY at 45 baud. 
Using a 85Hz shift gave strings of digits that made the pattern 
-xxyyy-xxyyy-xxyyy where xx is the channel number (it incremented from 
00 to 59) and yyy is the value.
Going through the data table from the December 1974 AMSAT newsletter 
(Thanks again Phil Karn) gives:

Channel	Values		OK	My reckoning from the table
00		366	Y	PA temp	70/2	transponder off
01	918	917	Y	+X current 	-14.1mA
02	871	892	Y	+Y current	27.9mA
03	637	753	Y	-X current	334mA
04	870	744	Y	-Y current	354mA
05	010	105	Y	+Z axis sensor	84deg
06		911	Y	+X current	-14.1mA	same as 01
07	881	906	Y	+Y current	-2.6mA		
08	00000	00000	N	All x8 channels are not working
09	906	779	Y	-Y current	279mA
10	000	000	Y	-Z axis sensor	90deg
11	769	770	Y	Battery volts	14.1v
12	337	338	N	Half battery volts 3.53v
13	711	715	Y	Regulated volts 24.31v
14	602	602	Y	10v Reg volts	9.38v
15	937	937	Y	9v reg volts	9.37v
16	416	421	Y	Ch reg1 volts 	6.51v
17	393	395	Y	Ch reg2 volts	6.06v
18	10000	10000	N	see 08
19	149	149	N	2304 beacon pwr
20	484	484	Y	Ch. Disc current	60.3mA
21	913	912	Y	+X current	-3mA
22	894	902	Y	+Y current	6mA
23			N	
24	845	728	Y	-Y current	389mA
25	010	094	Y	+Z sensor	84.6deg
26	889	888	Y	+X current	47.2mA
27	878	883	Y	+Y current	40mA
28	20000	20000	N	see 08
29	867	750	Y	-Y current	341mA
30	000	000	Y	-Z sensor	90deg
31	000	000	Maybe	10m RF output	0W
32	000	000	Y	2m RF out	0W
33	467	472	Y	70cm beacon out	258mW
34	000	000	N	Total solar array current
35	238	238	N	Battery temp	formula truncated
36	238	247	N	Baseplate temp	formula truncated
37	258	273	Y	+X facet temp	53.2deg
38	30000	30000	N	see 08
39	259	258	N	2304 beacon temp
40	501	501	Y	Midrange telemetry cal	5.01v
41	915	915	Y	+X current	 -9.8mA
42	911	912	Y	+Y current	-15.6mA
43	684			-X current	482mA
44			N
45	020		Y	+Z sensor	88.9deg
46	294		Y	+X current	1350mA
47	916	916	Y	+Y current	-24.3mA
48	40000	40000	N	see 08
49			N
50	000		Y	-Z sensor	90deg
51	767		Y	Battery volts	14.12v
52	331		N	Half battery volts	3.48v
53	009		N	AGC level 70/2 transponder
54	000		N	Tx osc 70/2	transponder off
55	000		N	Rx Osc 70/2	transponder off
56	000		N	Mod out 70/2	transponder off
57
58	50000		N	see 08
59	855	855	Y	Conv. Osc 70/2	9.50v
Missing numbers were corrupted. The values were from two frames.  The 
second value is the preferred value used in the calculations.	

Comments:
Judging from parameter 40, the calibration is still ok.  Any parameter 
in the x8 series is not working.  The temperatures are out of range.
I don't know about the Zaxis sensors.  Is -Z in shadow?

AO-7 still continues to surprise.

73 de David VK5DG