June 2014 - AMSAT-BB - mailman.amsat.org

Interest FN55 or FN64?
by Daniel "Nick" Kucij 06 Jun '14

06 Jun '14

I will be in Bangor, Maine on the morning of Sat., June 7th. I expect to be able to drive a half hour north to activate FN55, if there is interest in that grid. I would be on the SO-50 pass around 1610 UTC with a pair of HTs and my trusty Arrow antenna. I can also activate FN64 on SO-50 sometime during next week if it is needed. Let me know if you need either of these grids. 73, Nick, KB1RVT

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(no subject)
by Jim White 06 Jun '14

06 Jun '14

I'd appreciate any info on who repairs Landwehr preamps (VHF and UHF). Resurrecting mine from 1990 and they are both dead. They have what I recall to be the classic symptom of a blown GasFET, when you apply power you get about 30dB of loss. Jim WD0E jim(a)coloradosatellite.com

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Best Preamp for ATV 439.25 MHz
by Farrell Winder 05 Jun '14

05 Jun '14

Has anyone done research and found the best in shack preamp for Amateur Television on 439.250 MHz? Any performance data and source of supply would be appreciated. Thanks, Farrell Winder, W8ZCF

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Got Grids
by wa4hfn＠comcast.net 05 Jun '14

05 Jun '14

Congrats to Dave W0DHB Got Grids award #9 gud job Dave WA4HFN Damon em55 www.starcommgroup.org

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Got Grids Rules
by wa4hfn＠comcast.net 05 Jun '14

05 Jun '14

To get the Got Grids award all 10 contacts must be on the SSB or CW birds No FM http://www.starcommgroup.org/gotgrids.html Thanks Damon

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GOT Grids
by wa4hfn＠comcast.net 05 Jun '14

05 Jun '14

To get the Got Grids award all 10 contacts must be on the SSB or CW birds No FM http://www.starcommgroup.org/gotgrids.html Thanks Damon

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Got Grids
by wa4hfn＠comcast.net 05 Jun '14

05 Jun '14

Congrats to Frank K4FEG Got Grids award #7 Also to Jeff NX9B Got Grids award # 8 Thanks to Ron N8RO for posting his trip in advance, it has given several others the chance to complete this award WA4HFN em55 Damon www.starcommgroup.org

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Obtaining G/T of the satellite Ground Station.
by Rupesh Lad 05 Jun '14

05 Jun '14

Dear all, We have a functional Ground station setup at QTH location MK68WM. We have a 2 Unit array of circularly polarized Yagi antenna mounted on antenna rotor system for tracking satellites operating in UHF band. Instrumentation available with us is Signal generators, Signal Analyzers, Vector Network analyzer, Spectrum Analyzer. The ground station setup includes antenna,Low noise amplifier, followed by 15m LMR 400 coax carrying signals to Kenwood TS2000 and RF switches to protect LNA during transmission. We wish to obtain G/T ratio of our system. Could you please throw some light on how to proceed? -- Regards, Rupesh Lad

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AO-7 mode change
by Glenn Miller - AA5PK 04 Jun '14

04 Jun '14

I was listening to AO-7 in Mode B as it rose at 2153Z. At 2158Z, AO-7 suddenly switched from Mode B to Mode A. At the time of the switch, there were two stations using excessive power (badly FMing) on the bird. Not sure if that was a coincidence or not. Called CQ on Mode A in both CW and SSB with no response. 73 Glenn AA5PK

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Re: [amsat-bb] satpc32 E/A-Fehler 105. error
by Thomas Doyle 04 Jun '14

04 Jun '14

Bob, I can tell you from years of experience with writing tracking programs for Windows and iOS that one of the biggest problems is decay. Strange things happen to math routines when the altitude of the satellite drops below the surface of the earth. One solution is filtering out these decayed sats from the list. The tracking program is the easy part the hard part is dealing with "bad" tle data. The old saying in the computer biz - "garbage in, garbage" out. Less you think this stuff is trivial take a look at this fine work by G3RUH. http://www.amsat.org/amsat/articles/g3ruh/111.html Maintaining lists of satellites and web pages is very time consuming. Some quit because it is a PITA. Fortunately there are some truly dedicated souls who do not give in to the lame PITA excuse. Dr. T.S. Kelso <TS.Kelso(a)celestrak.com> is one. He maintains the most reliable set of sat tle data I know of. http://www.celestrak.com/ Another is Erich Eichmann who puts in countless hours of his time maintaining and improving SatPC32. We all owe a great deal to these two pillars of the hobby. I suggest using the Celestrak data sets exclusively. There will be the occasional sat that has decayed that may cause a problem but that is the nature of the hobby. All the sat tracking programs are complex - the only thing more complex than trying to figure out a sat tracking program is trying to figure out two of them. I am sure others have a different opinion but IMHO stick with SatPC32. 73 W9KE Tom Doyle On Tue, Jun 3, 2014 at 10:53 PM, Bob- W7LRD <w7lrd(a)comcast.net> wrote: > I can not get it to run (satpc-32). Someone said it is because of a > inactive satellite in the list. Which one?? It will just keep happening. > Also I am looking for a backup sat program as satpc32 is unreliable. > Recommendations?? > 73 Bob W7LRD > _______________________________________________ > Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > -- Sent from my computer. tom ...

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