FO-29 のバッテリー温度が高いことを懸念するメールが米国Richlandカレッジ の関係者から届きました。メールタイトルの Buzz の意味がわからない..... Subject: FO-29 CW Buzz From: Frank Wiesenmeyer To: Mineo Wakita Date: Wed, 31 Dec 2014 21:17:14 -0600 Hello Mineo: I have been concerned about the FO-29 steady high battery temperature around 35-37C since August 9, 2014. This is around the time that the spacecraft began to be in full sunlight through the entire orbit. Today I have now noticed the CW note on the beacon and other CW stations has a very noticable BUZZ much like a poorly filtered DC power supply with AC ripple. Since we have no source of AC on the spacecraft, I am thinking that some other form of AM moulation is taking place, perhaps in the switching regulator subsystem. I am hoping this symptom will disappear by itself,but due to the satellite's age and high battery temperature, I am more than a little concerned, more like worried. The battery current channel 4B has sent strange data for many months now. For example today's numbers like 46, 4A and 4D which translate to +214 mA suggests that the battery is discharging even though it is in the sunlightand the solar arrays are producing 1068 mA which is normal. I wonder if one of the 11 battery cells has shorted and the BCR (battery charge regulator) may be malfunctioning or overreacting . The Bus Voltage channel 5A alsoreads strangely low, unusual values since mid September 2014. Typical ch 5A now is 98 which translates to 14.896 Volts, just 0.168 V below the 15.064 battery voltage. Before September 18, 2014, The bus voltage channel 5A typically read F1, which when corrected to B1 translates to to 17.353V with battery voltage of 15.60V (TE channel 4C reading 91). Therefore, the Bus Voltage was normally 1.75 V HIGHER than the battery voltage. Today's Data: 74 46 8D 8C 99 75 89 82 81 86 79 22:47:22 UTC 12-31-14 6D 4A 8C 8A 98 7A 89 82 81 86 79 22:48:11 UTC 12-31-14 65 4D 8A 88 95 70 89 82 80 86 79 22:49:02 UTC 12-31-14 I hope you and your fine family are all in good health and safe from the radiation that was leaking from the Fukushima nuclear plant. Best wishes for the NEW YEAR. 73 for now, Frank K9CIS PS 10m and 15m are still very good for DX to Japan. Do you operate on these bands? -------------------------------------------------------------------------- Re: FO-29 CW Buzz From: Mineo Wakita To: Frank Wiesenmeyer Date: Thu, 1 Jan 2015 20:45:10 +0900 Hello Frank, Happy New Year. Thank you for the detailed report on the FO-29. I already analyzed using the data DK3WN has received in 16:57 UTC, 22 December 2014. Data I hihi 200288d500770000096001016f4f8c89964f7e7c838375 hihi 200288d50077000009600101644f8a8894697e7c838375 hihi 200288d5007700000960010161708987937e7e7c838375 Data II hi hi 20 02 88 d5 00 77 00 00 09 60 01 01 6f 4f 8c 89 96 4f 7e 7c 83 83 75 hi hi 20 02 88 d5 00 77 00 00 09 60 01 01 64 4f 8a 88 94 69 7e 7c 83 83 75 hi hi 20 02 88 d5 00 77 00 00 09 60 01 01 61 70 89 87 93 7e 7e 7c 83 83 75 My wrote program "fo29cwts.exe" can be analyzed either Data I and II, and "fo29cwte.exe" can be analyzed using only Data II. We will get more detailed analysis results using "fo29cwte.exe". http://www.ne.jp/asahi/hamradio/je9pel/wispinfo.htm#fo29 > PS. 10m and 15m are still very good for DX to Japan. > Do you operate on these bands? I don't have unfortunately the antenna of those band. JE9PEL, Mineo Wakita
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