February 2007 - AMSAT-BB - mailman.amsat.org

Re: EME signals ? with WSJT
by Mineo Wakita 26 Feb '07

26 Feb '07

This JT65B sound was not EME signals or Satellite telemetry. Sorry.

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Eagle and AO40
by jim＠beeson.cc 26 Feb '07

26 Feb '07

I am curious at the thoughts of current satellite users. As I read the AMSAT Journal and see the progress of the Eagle Project, it reminds me of a few years ago when another "do it all" satellite was being planned - AO40. Amateurs are pumping thousands of dollars and time into this project. I remember I followed AO40 with great excitement, not to mention spending a few grand upgrading my station to be ready for this "super bird". And after all the things that went wrong after the launch, I thought - never again. So my question is basic: why spend all this money and wait years for something that might end up another catastrophe? Why do we have to try and design a bird that does it all? We all know the more complex the bird the more room for failure. Why not just pop out another AO13 - or similar? I can't tell you how many hours of fun I had with RS10/11. And with the way things are in amateur radio now, who knows if there will be anybody even interested in this by the time Echo finally is useable. Just a thought. I would like to hear yours now please. Jim Beeson WA5QAP

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RSGB HF Convention
by Simon Brown (HB9DRV) 26 Feb '07

26 Feb '07

The 2007 RSGB HF Convention provides the opportunity to spread the satellite word. http://www.rsgb.org/hfc/ I am putting a tentative talk together which covers a ground station on 2m/70cms using a TS-2000 and my own software. I am not aware of any proposed talks on the innards of a satellite or AMSAT in general. For my talk I am planning on having a station available for demonstration during the convention: * TS-2000 * Computer * AlfaSPID * 2m / 70cms crossed yagis. * Ace operator. Simon Brown, HB9DRV

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Re: AMSAT Journal
by Bob Witte K0NR 26 Feb '07

26 Feb '07

Jeff Davis, KE9V Wrote: One example, "Why Can't I Hear AO-51?" by Mark Spencer, WA8SME is a short but definitive treatise on the subject and it really gets to the heart of that same old question asked here many times and in many ways. You want opinions, toss your question out on the -BB and you'll get plenty. You want answers. join AMSAT and get the Journal. "Bravo" and "Kudos" to Ed Long, Bill Hook and all those whose hard work on the Journal is so obviously visible in the end product. Thanks, 73 -------------------- This is a must read article for folks working the FM LEOs. It provides some important technical reality around working the sats with an HT. Hint: it is all about hearing the bird. Nice job, Mark. 73, Bob K0NR

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Re: Anybody need an ARR MMLXXXVDG schematic/manual?
by TOFFY 26 Feb '07

26 Feb '07

Hi Alan,WA4SCA I need the docs. Please send to me. I have plan to build it. 73s de Toff HS0NNU >Hi, > >In cleaning out some old files, I came across the docs for the older ARR >GasFet mast mounted preamps. It is good for the 50, 144, 220, and 440 MHz >versions. Before I toss them, I wondered if by any chance anybody needs, or >want one? I can scan as many as needed. > > >Alan >WA4SCA ____________________________________________________________________________________ Need a quick answer? Get one in minutes from people who know. Ask your question on www.Answers.yahoo.com

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Re: Can D-Star work on VO-52?
by Trevor 26 Feb '07

26 Feb '07

> From: "joseph Murray" <k0vty(a)juno.com> > I continue to ask one question about digital voice on HF. > When will Hams see a digital voice system that will be able > to Handle a 20 meter pile up. > So far , the answers have been negative. Quite right Joe, it's why I don't think any of the existing Digital Voice systems will be the one that hams use in 10 years time. The processing power of DSP's continues to increase each year and I'm sure we'll eventually see a viable narrow band Amateur Digital Voice Mode. 73 Trevor M5AKA ___________________________________________________________ Yahoo! Messenger - with free PC-PC calling and photo sharing. http://uk.messenger.yahoo.com

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Re: Ham HT and SkyCommand
by Bob Bruninga 26 Feb '07

26 Feb '07

>Can you use the TS-2000 in satellite mode and use >it for satellite contacts? When I first posted, I had that in the back of my mind, but quickly realized that it can't work that way, of course, because both VHF and UHF are used in the command link, so there is nothing left to operate the VHF/UHF satellite links. Bob Wb4aPR

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Re: Ham HT
by John Mock KD6PAG 26 Feb '07

26 Feb '07

At this point, unless one is going to use a separate radio for transmit and receive, the only new HT i can recommend is the Kenwood TH-D7A[G]. Right now, it's the only rig which can still operate in full-duplex. Full-duplex operation is essential in mode J-FM or you are likely to either cause QRM or waste valuable satellite transponder time. To test a radio for full duplex operation, make sure you bring headphones when you test a radio. Listen to a weather service station on one band (with headphones) and transmit briefly on 446.0 MHz (or other suitable UHF channel). If the weather service broadcast is uninterrupted while you transmit, then you have a radio suitable for mode J-FM. This should be helpful in evaluating a used HT. If you're going to use two radios, then the TH-F6A is a decent choice. I found it to be adequately sensitive if i gave it a good antenna, and with an unmodified downconverter, i used it as the receive side to work AO-40. With an antenna similar in gain to an Arrow satellite antenna, i've also heard FO-29, AO-7 and VO-52 well enough to work people given a suitable up-link radio. -- KD6PAG (Networking Old-Timer, Satellite QRPer)

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Can D-Star work on VO-52?
by Patrick Green 26 Feb '07

26 Feb '07

Hi All, I'm wondering if the GMSK modulation scheme in D-Star can be inverted and whether the Icom 91AD dualband HT can work full duplex for satellite work. D-Star uses a 6.25kc channel which is way better than the 15kc needed for standard FM but not as friendly as SSB and CW. Let me know. I haven't purchased this equipment but it's worth at least a debate. 73 de Pat --- KA9SCF.

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new satellite
by nader omer 26 Feb '07

26 Feb '07

hello all i found this link to a new satellite with amateur frequency http://www.bluesat.unsw.edu.au/?setMain=http://www.bluesat.unsw.edu.au/cont… any more information ? --------------------------------- Don't pick lemons. See all the new 2007 cars at Yahoo! Autos.

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