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Telemetry Error Modification ------------------------------------------------------------------------ Re: FO-29 Solar Array Current Graph From: Frank Wiesenmeyer To: Mineo Wakita Date: Sat, 1 May 2010 22:35:16 -0500 Hi Mineo: I am still studying FO-29 telemetry. Seems that solar array output is notas large as last year in April. This may explain why the battery is discharging in full sun under heavy use. Thought you might like to see my data plotted. I have many of these graphs from over many years and the solar array output is down 200 mA approximately in recent weeks. More later. Let me know if this plot came through the email ok. 73 for now, Frank K9CIS Decatur, IL USA 290 km South West of Chicago
Re: New FO-29 Solar Array Current Graph From: Frank Wiesenmeyer To: Mineo Wakita Date: Wed, 19 May 2010 08:37:32 -0500 I have been analyzing more FO-29 telemetry data. I have just received some very nice data that produced a beautiful sinusoidal plot that makes it very easy to estimate the spin period. It turns out that FO-29 is rotating almost exactly at the same rate as last year. The new value is 17.15 minutes vs. 17.25 minutes a year ago. My measuring method is probably not accurate enough to resolve a .10 minute difference, hi hi. It is also very interesting that the telemetry frame rate has slowed to about 49 seconds/ frame vs. the 45 seconds/ frame of a year ago. The maximum output from the solar arrays are not the same, however, and seem to always be 200 mA less that a year ago every time I plot the data. This very well behaved data makes it easy to see the comparison. I am studying Spanish at the local Community College and it has been a lot of fun but also a lot of work. I really admire your ability to speak and read English, which would be much more difficult to learn as a 2nd language. Thank you for posting my data. No one around here seems very interested in this information and I am glad you found it interesting. FO-29 signals seem good now, but still not quite as strong as I remember them from a year ago. This is a wonderful satellite and we will surely miss it when it comes to the end of its life. I hope it lives on for many years like AO-7! Do you know if the JAMSAT people have any plans for a new satellite to follow FO-29? I am hoping for another Mode J bird in a higher orbit so we can have QSOs with our friends in Japan. AMSAT seems only interested in FM single channel repeater type satellites which are very boring to me. Thanks again for sending my data to the FO-29 command headquarters. 73 for now, Frank K9CIS PS. I do all of my computer work with an APPLE iMac G5, 1 GB Memory, 1.6 GHz Power PC processor
Re: New FO-29 Solar Graph From: Frank Wiesenmeyer To: Mineo Wakita Date: Sun, 23 May 2010 20:14:07 -0500 Here is a new graph of Solar Array Current. It is still 200 mA lower than last year, but very interesting. It is nearly constant for the entire pass.
Re: FO-29 solar current From: Frank Wiesenmeyer To: Mineo Wakita Date: Tue, 22 Jun 2010 17:29:50 -0500 Recently replaced my defective G-500A elevation rotor and I am again able to receive solid FO-29 telemetry. Attached is an interesting graph that perhaps indicates that there is a weak area in one of the solar arrays and when the sun hits that section, the current drops suddenly by about 300 mA.
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