● (No.505) AO-07 分析結果 (2006年11月16日) ------------------------------------------ Suject: AO-07 healthy CW From: Mineo Wakita, JE9PEL/1 Date: 2006年11月14日 18時58分13秒 本日(11/14) 夜18時30分頃、久しぶり(10ケ月ぶり)に、AO-07 の シャン とした CW (145.972MHz) 信号を聞きました。ノイズの向こうに、はっきりと聞こえます。 デコードも可能です。 http://www.ne.jp/asahi/hamradio/je9pel/61114a07.wav (80秒) このポストに対し、外国局が分析した多くの解析結果を受け取りました。 外国には耳の達者な局がたくさんいるものですね。 ---------------------------------------------------------------------- Subject: [amsat-bb:95510] Re: AO-07 healthy CW From: "Garie Halstead K8KFJ" Date: 1:09, 15 Nov 2006 --- Mineo Wakita wrote: > I heard today CW (145.972MHz) from AO-07. > http://www.ne.jp/asahi/hamradio/je9pel/61114a07.wav > 80 seconds HI HI 180 180 180 180 252 252 252 252 324 324 324 324 496 496 496 496 568 568 568 568 696 696 696 696 HI HI //Gary -K8KFJ- ---------------------------------------------------------------------- Subject: [amsat-bb:95513] Re: AO-07 healthy CW From: "Martin Gillen" Date: 7:54, 15 Nov 2006 I plugged that data into the AO-7 telemetry calculator and got: CH CHANNEL NAME Value == ============ ===== 1A Total Solar Array Cur 2360 ma. 1B +X Solar Panel Cur 370 ma. 1C -X Solar Panel Cur 370 ma. 1D +Y Solar Panel Cur 370 ma. 2A -Y Solar Panel Cur 930 ma. 2B RF Pwr. Out 70/2 1.8432 watts 2C 24 Hr. Clock Time 811.2 minutes 2D Batt Chg/Dischc Cur. 80 ma. 3A Battery Voltage 8.8 volts 3B Half-Batt Voltage 2.4 volts 3C Bat. Chg. Reg. #1 3.6 volts 3D Battery Temperature 60.28 C 4A Baseplate Temp. -46.28 C 4B PA Temp 2/10 Rptr -46.28 C 4C +X Facet Temp. -46.28 C 4D +Z Facet Temp. -46.28 C 5A PA Temp. 70/2 Rptr -4.84 C 5B PA Emit. Cur. 2/10 793.56 ma. 5C Modul. Temp. 70/2 -4.84 C 5D Instr. Sw. Reg. 66.76 ma. Input Cur. 6A RF Pwr Out 2/10 5907.69230769231 mw. 6B RF Pwr Out 435 956.6 mw. 6C RF Pwr Out 2304 377.856 mw. 6D Midrange Telemetry 0.96 V Typ.(0.50 +- 0.01) Calibration ---------------------------------------------------------------------- Subject: [amsat-bb:95520] Re: AO-07 healthy CW From: "Sil - ZL2CIA" Date: 18:02, 15 Nov 2006 Hi, Firstly, thanks to Mineo Wakita (JE9PEL), Gary Halstead (K8KFJ) and Martin Gillen (VA3SIE) for the reception, copying, and decoding the data from AO-07. I remember some of the discussion posted here, when AO-07 started working again. The consensus seemed to be that the satellite had failed 25 years previously because too many of the NiCd cells in the battery had become short circuited (as NiCd do with time). This had caused the battery voltage to fall to a level too low to operate the transponder. Time,(and perhaps corrosion caused by the battery chemicals) had eventually created an open circuit and the satellite was now operating directly from the solar panels. Certainly, it goes very dead once it is in darkness which rather supports this idea. However, channel 2D of the telemetry shows a Battery Charge/Discharge current of 80 ma. Since this is positive, I assume that it represents a "charge" current. I see too that the "half battery voltage" is 2.4 volts, while the full battery voltage is 8.8 volts. So the dead battery is behaving like a 110 ohm resistive load and consuming 0.704 watts. This doubtless explains why the battery is at a toasty 60 C and most of the rest of the satellite is at -46 C. Also freezing is the 10m PA (channel 4B). This is not surprising since it was "off" when JE9PEL recorded the CW. Yet this PA is drawing almost 0.8 amps of emitter current and producing nearly 6 watts of RF. It's consumming 7 watts (8.8V * 0.8A)making the PA about 86% efficient). Does this mean that the telementry is unreliable (fair enough, it a very old satellite)? The 2m PA (channel 5A) is a whole bunch warmer at -5 C. This makes sense since the 2m transmitter was the one sending the data (or perhaps it's installed next to the battery!) I presume that the 2m beacon signal is simply injected into the 2m PA. Is this correct? The battery voltages (and half battery voltages) give some indication of where the remaining short circuit cells might be (in case anybody wants to go up and fix them - actually, I will do that if someone can give me a lift). I wondered about this in a sort of hypothetical way. I'm curious for its own sake (and clearly have too much time on my hands). I tried to find some details of the satellites design via google, but didn't (I'm sure others will succeed in this). I also looked in my own humble Ham library for details of the design, but didn't find any. I guess that the satellite battery consisted of cells in series and batteries in parallel, or perhaps of cells in parallel then in series to make a battery. Does anybody know exactly? Can anybody point me in the right direction? Sil - ZL2CIA ---------------------------------------------------------------------- Subject: [amsat-bb:95523] Re: AO-07 healthy CW From: "i8cvs" Date: 21:55, 15 Nov 2006 ----- Original Message ----- From: "Sil - ZL2CIA" Sent: Wednesday, November 15, 2006 9:01 AM Subject: Re: AO-07 healthy CW > Hi, > > I guess that the satellite battery consisted of cells in series and > batteries in parallel, or perhaps of cells in parallel then in series to > make a battery. Does anybody know exactly? Can anybody point me in the > right direction? > > Sil - ZL2CIA Hi Sil, ZL2CIA Unfortunately Larry Kayser VA2LK the expert of the OSCAR-7 batteries passed away 5 october 2004 I believe that actually the right people to supply you with the informations about the batteries and BCR are Jan King W3GEY and Dick Daniels W4PUJ However you can get many useful informations about the batteries of OSCAR-7 reading a lot of letters from Larry Kayser wich are available in the Amsat-BB Archives from june 2001 Best 73" de i8CVS Domenico
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