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

LVB Tracker 1 Nova fix
by Howard Long 28 May '08

28 May '08

Folks A few weeks ago my attention was drawn to a compatibility problem with Nova and the LVB Tracker 1. I believe that I have found the fault, but it is not clear why it has taken so long for this problem to occur, especially as Nova has been my tracking program of choce for many years! It may only affect more recent versione of Nova. I have adjusted the LVB Tecker's Baud Rate Generator slightly to be much closer to 9600bps. I must have made an error in my calculations all those years ago, so it was only operating at 9259bps. I have adjusted the BRG by one to make 9616bps and things seem to be much better now. Technically, we were only 3.5% out anyway which normally would be OK (ISTR that 5% timing error is the limit). Anyway, new 0.9 binaries and source here: http://www.g6lvb.com/Articles/LVBTrack.hex http://www.g6lvb.com/Articles/LVBTrack.c 73, Howard G6LVB

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IT
by Ronald A. Stunden 28 May '08

28 May '08

Seems to me there was a patch for 1.5 etc for the map operation with Win XP but I can't find it . Anyone know where to find it?? Thanks Ron

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Re: RS-30 telemetry
by Trevor 27 May '08

27 May '08

--- On Tue, 27/5/08, Trevor <m5aka(a)yahoo.co.uk> wrote: > I'm just hoping that between 435.215 and 435.315 is the > output of a Mode J linear transponder - fingers crossed. Alas that may be wishfull thinking. Just been reading the Journal of OAO "ISS" No.3, February, 2008 at http://www.iss-reshetnev.ru/images/File/magazin/2008/m3-screen.pdf and from there it looks like a 145-435 MHz Store-and-Forward system. 73 Trevor M5AKA __________________________________________________________ Sent from Yahoo! Mail. A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html

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Re: LVB Tracker 1 Nova fix
by Howard Long 27 May '08

27 May '08

Folks Here's a note I've sent privately to some individuals about the 0.9 update, but I guess due to the response it's wise to spread it more widely. Firstly, if you're not having any problems then I don't see a need to update the firmware. The version you have (probably 0.7 or 0.8) has been stable for many years now and the small change I made for 0.9 is most probably unnecessary unless you are encountering problems. I've been using Nova for quite some time (many years) and it was only recently I've been aware of any problem. Because of the nature of the fault (it's intermittent), it's taken a while to find it. Regarding a firmware upgrade, I would only recommend upgrading the firmware from the serial 'MAX232' port, and only using a 'proper' serial port (not a USB one). I do know that in the early days of the project I did manage to program the unit via an emulated USB COM port, but latterly I found it unreliable and slow if it worked at all. You could try upgrading through the USB port, but please bear in mind that if it fails part way through the flash upgrade you'll need to try again until it's successful: once the flash upgrade has started, it's already blown away the last code. A failure in programming won't bust the chip itself, but of course it'll be frustrating if you need to find a machine with a serial port on it. 73, Howard GJ6LVB

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2.4GHz RTX
by Andy Brian 27 May '08

27 May '08

Hello all, I need for my study project to find the RTX for cubesat, which works on 2.4-2.5GHz FM. Maybe any modules avaible for buy from internet or any useful information about IC with integrated RX or TX which can I use for my project will be great. Thanks for help BR Andy

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Re: ISS digi active?
by Alan P. Biddle 27 May '08

27 May '08

Many thanks. Will pass that along, as it should reduce the anxiety level. ;) Alan WA4SCA

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newbie question Icom 910H & LEO antennas
by Jim Danehy 27 May '08

27 May '08

Although licensed for 55 years + , I am just now an SWL on the birds. I did Oscar 6 in ~ 1975. Having worked and confirmed all of the DXCC countries and just recently retired, the birds have my interest. I have plenty of 1/2 inch and 7/8 inch hardline and connectors as well as a Kenpro G 500 elevation rotor. I have an Elecraft K2 with their transverter and a Microwave Module with satellite capability for 435. Just need some antennas. I am also thinking of getting a more modern rig and the Icom 910 caught my eye. A friend of mine has a Yaseu 736 which he will sell me with 2 and 440 modules. No price discussed yet but I thought $700 would be my top. As an alternative I thought about the Icom 910H. The only concern was a comment I read on EHam that it was not user friendly on the FM birds being more friendly to the JA birds. Is the 910 capable of doing AO 51 OK or is it a pain ? Often information can be misleading. This is my first post here on the BB. If there is any bird operator close to Cincinnati, Ohio , I would love to visit your station. I do have the old style Mirage bricks for 2 and 432 too. I thought of Egg beaters from M Square but now leaning more toward the 10 foot long circular yagis for 2 and 432. Any info or comments would be greatly appreciated. Hope to QSO many of you soon. 73 Jim W9VNE

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Re: RS-30 telemetry
by Trevor 27 May '08

27 May '08

--- On Tue, 27/5/08, David <vk5dg(a)aapt.net.au> wrote: > Heard RS-30 transmit CW during the whole pass. Below is > the telemetry > received. Sounded ok. I also wonder if there is more to > this satellite than > the builders are letting on. I'm just hoping that between 435.215 and 435.315 is the output of a Mode J linear transponder - fingers crossed. BTW I see brief details of the Amateur payload were posted on the web back in January: http://www.rian.ru/technology/cosmos/20080122/97519139.html 73 Trevor M5AKA __________________________________________________________ Sent from Yahoo! Mail. A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html

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Re: RS-30
by G0MRF＠aol.com 27 May '08

27 May '08

Latest element set appears to be: RS-30 1 32955U 08025C 08147.83789275 .00000010 00000-0 00000+0 0 78 2 32955 082.5009 136.8546 0019472 301.5302 058.3868 12.43253228 404 435.312 ish

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RS-30
by Arlon Nelson 27 May '08

27 May '08

Would someone be so kind as to send me the frequencies and latest keps for RS-30 Thanks 73, Nels, WØTUP Minot, North Dakota anelson(a)min.midco.net - w0tup(a)arrl.net http://min.midco.net/ws Ward County - Grid Locator DN98if SKCC 31 - Flying Pigs 590 - QRPp-I #760 ARRL - FISTS #8610 - CC #1310 - FISTS WAS #143 FISTS PLATINUM #365 - FISTS SILVER #367 ARRL SSTV WAS #33 - IVCA MIXED BAND SSTV #1 40 MTR CW WAS - DXCC # 39623 *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Two antennas met on a tower, fell in love and got married. The ceremony wasn't much, but the reception was excellent. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

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