January 2008 - AMSAT-BB - mailman.amsat.org

CQ Magazine Dec '07
by Clint Bradford 19 Jan '08

19 Jan '08

Can someone tell me if there's an article by Wayne Yoshida on "Working the Sats with Low Power" article in this issue? I'm getting inquiries via email... Clint Bradford, K6LCS / KAF3359 909-241-7666

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Re: AO-51 update
by John Marranca, Jr 19 Jan '08

19 Jan '08

1.12 watts?! Wow...so that's why it's been so loud as of late. Those of us that DON'T use preamps (soon to change) have an easier time now. 73 de KB2HSH -- _______________________________ John Marranca, Jr PBX Technician/Shop Steward CWA Local 1122 BN Systems, Inc Orchard Park, NY (716)972-2006

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AO-51 update
by Gould Smith 19 Jan '08

19 Jan '08

I turned the SQRX receiver back on yesterday and after looking at the telemetry last night, set the freq and FM mode for L Band. Updated the text message this morning. L/U Digi is on. TXA V/U repeater 1.12 W TXB L/U BB 500 mW Satellite structure temp 28.5 - 32 degrees C Battery 1 temp 31 - 33 degrees C BCR Voltage Regulator 42 - 45 degrees C 73, Gould AO-51 Command Station

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Satellite in eclipse
by PDC 19 Jan '08

19 Jan '08

At great risk of being thwapped with a clue bat, I'm going to ask this newbie sort of question that may seem stupid but it has me stumped. I read/hear about satellites being in eclipse for too long and running out of battery/shutting down/whatever. Now, since most of the LEO satellites are in orbits of 100 minutes +/-, I don't understand how they could be in eclipse for more than ~50 minutes. So the question is... For the satellites that have this eclipse issue, is it that their batteries are essentially expired and can't power the satellite for ~50 minutes (that makes sense to me) based on the charge they get from having the solar panels exposed for ~50 minutes, or is there some mechanism that is totally non-obvious to me that allows a LEO satellite to be in the dark for periods of time much longer than half of each orbit thereby creating a situation where the batteries have to power it in the dark for a very long period of time relative to the orbital period? If it's the former, well, that's obvious enough I guess. If it's the latter, could someone draw me a picture or point me to a URL that explains how that is possible? Thanks. Darin VE3OIJ

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AO-51 L/U digi ON?
by Mineo Wakita 19 Jan '08

19 Jan '08

Today, Jan.19, I could digipeat via AO-51 APRS although a message "L-Band uplink PBBS NOT On". JE9PEL>APRS,PACB-1* [01/19/08 19:41:27] <UI R>: =3523.05N/13936.61E- Yokohama Japan {UIV32} JE9PEL>APRS,PACB-1* [01/19/08 19:41:43] <UI R>: =3523.05N/13936.61E- Yokohama Japan {UIV32} JE9PEL>APRS,PACB-1* [01/19/08 19:42:30] <UI R>: =3523.05N/13936.61E- Yokohama Japan {UIV32} PACB-1>AMSATN-1 [01/19/08 19:42:36] <UI>: >17 Jan 2008 ... AO-51 in no eclipse period... Command team testing at any time...FM Repeater ON ... L-Band uplink PBBS NOT On ... 73 WA4SXM de JE9PEL, Mineo Wakita

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Re: echo
by Jim Shorney 19 Jan '08

19 Jan '08

On Sat, 19 Jan 2008 00:39:59 -0600 (CST), Jim Shorney wrote: >06:25-06:35 UTC, 7.047 MHz Ooops, that should be 7.407 MHz... 73 -Jim -- Ham Radio NU0C TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/

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Re: echo
by James 19 Jan '08

19 Jan '08

5:10 - 5:25 UTC 6.7925 CW The HAARP transmitter s5 - s7 Echo s0 to s5 Kenwood TS-440s G5RV Antenna @ 30ft Lavonia, Georgia Grid EM84km 73! James KB7TBT www.kb7tbt.com

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"The Oscar 0 Experiment"
by John Marranca, Jr 19 Jan '08

19 Jan '08

Can hear the transmitted and the reflected tones here in FN02 with my Center-Fed Zepp hooked to my FT-817ND. This is so cool...I'm glad I'm recording it! 73 DE KB2HSH -- _______________________________ John Marranca, Jr PBX Technician/Shop Steward CWA Local 1122 BN Systems, Inc Orchard Park, NY (716)972-2006

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Re: Lunar Short Wave echo experiment looking for Listen er reports
by Keith N4ZQ 19 Jan '08

19 Jan '08

Your absolutely correct Dave. I missed the fact that the U.S. Naval Observatory page was giving me local time instead of UTC that I was thinking. Damn, now I better get the coffee pot ready. Looks like it will be a late night. To keep this post in line with satellites, if this experiment proves successful does it mean it's possible we could have a bird circling the moon with say a mode K transponder ? :-)) Thanks for the correction Dave... Keith -- Dave Taylor <dave.w8aas(a)verizon.net> wrote: I think you are confusing time zones. Here in Maryland, the moon sets Saturday morning at 4:54am EST, and the experiment is midnight to 2am. For me, the moon will be between 50 and 28 degrees elevation during the experiment. -- Dave, W8AAS On Jan 18, 2008, at 9:16 AM, Keith N4ZQ wrote: > If I'm reading the chart correctly at > > http://aa.usno.navy.mil/data/docs/RS_OneDay.php > > it looks like this event doesn't start till after Moon Set on the > east coast of the states.. Oh well, looks like I won't have to > give up any sleep.. ;-) > > Keith > > > -- Ernie Howard <w8eh.Ernie(a)gmail.com> wrote: > > > They have a web page that confirms the 19/20th UTC. > > http://www.haarp.alaska.edu/haarp/mbann.html > > HAARP-LWA Experiment Schedule > Date From To Transmitted Frequency > (UTC) UTC Hr:Min) (MHz) > 19 January 2008 05:00 06:00 6.7925 > 06:00 07:00 7.4075 > > 20 January 2008 06:30 07:30 6.7925 > 07:30 08:30 7.4075 > > Ernie > W8EH > > > Trevor wrote: >> Some real DX signals to listen out for on 6.7925 MHz and 7.4075 MHz. >> Note one part of the text says Jan 18/19th but when times are >> specified the >> 19th and 20th are given. Could there be a typo here ? anyone know ? >> >> ARR report >> http://www.arrl.org/?artid=7958 >> >> 73 Trevor M5AKA >> --------------- > _____________________________________________________________ Click for free info on paralegal training and make up to $150K/ year. http://thirdpartyoffers.netzero.net/TGL2221/fc/Ioyw6i4t4B8pA7mKHPJCnkE7RGx6…

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echo
by Patrick McGrane 18 Jan '08

18 Jan '08

greetings from patrick n2oeq Managed to hear echo on the regular diamond 500 vertical on 100 feet of 9913 for a few minutes during mid-pass. Apparently the additional downlink power made a bit of a difference. Maybe lesser equipped stations could give the satellite a try. Happy weekend, 73, patrick

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