October 2012 - AMSAT-BB - mailman.amsat.org

Job openings working for me
by Robert McGwier 19 Oct '12

19 Oct '12

http://listings.jobs.vt.edu/applicants/Central?quickFind=196236 -- Bob McGwier Owner and Technical Director, Allied Communication, LLC Facebook: N4HYBob ARS: N4HY

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FitSat Visual
by Kevin Deane 19 Oct '12

19 Oct '12

Has anyone seen the LED's flashing Morse Code? Web>>>>http://www.fit.ac.jp/~tanaka/fitsat.shtml Report>>>>http://www.fit.ac.jp/~tanaka/fitsat.shtml Not sure my keps are right... Thanks for any help. Kevin KF7MYK

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LEO to HEO
by Joshua 19 Oct '12

19 Oct '12

Morning folks, I'm a relatively new ham and started following amsat only a few months so forgive something of a novice question. The biggest trouble I see the community hitching a ride to a high orbit although low orbits seem to be easy to get. So my question is this, who says we can't launch a sat in LEO and design it to move itself up to a higher orbit? I mean if NASA can build probes capable of reaching mars, it stands to reason we can build a bird to move only a few thousand miles. Thanks, Joshua Abraham, KJ4VYR

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Amsat Journal?
by ryan woods 18 Oct '12

18 Oct '12

What is going on with the journal I have not received one in a long time..... I always enjoyed reading it..... I know im still okay on my dues are up to date because I joined this year after moving out of my parents house. Sent from Yahoo! Mail on Android

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Re: OH2AUE P3E transponder demo video
by i8cvs 18 Oct '12

18 Oct '12

Hi Robert, WB5MZO I don't believe that the linear transponder built and sold by PE1RAH for a price of 1800 Euro is a flight space ready device because normally it need to be tested at minimum into a vacum chamber at low and high temperature and also vibration test and so on to be qualified for a flight space launch. 73" de i8CVS Domenico > ----- Original Message ----- > From: R Oler > To: domenico.i8cvs(a)tin.it > Sent: Thursday, October 18, 2012 8:10 PM > Subject: RE: [amsat-bb] Re: OH2AUE P3E transponder demo video > > > Is the cost you mentioned for a flight space ready device? Robert > WB5MZO > > > > From: domenico.i8cvs(a)tin.it > > To: gordonjcp(a)gjcp.net; amsat-bb(a)amsat.org > > Date: Thu, 18 Oct 2012 17:28:20 +0200 > > Subject: [amsat-bb] Re: OH2AUE P3E transponder demo video > > > > ----- Original Message ----- > > From: "Gordon JC Pearce" <gordonjcp(a)gjcp.net> > > To: <amsat-bb(a)amsat.org> > > Sent: Thursday, October 18, 2012 8:47 AM > > Subject: [amsat-bb] Re: OH2AUE P3E transponder demo video > > > > > What I am referring to is linear transponders. They're heavy and > > > consume a lot of power. We need to either devise a new way of doing > > > that, that doesn't involve heavy inefficient linear amplifiers, or > > > stick to something like FM or GMSK where a little lightweight PA > > >that doesn't dissipate most of the input power as heat will do the > > >job. > > > > > > It depends what you're trying to achieve. I'll respond to Domenico's > > > comments here, too. > > > > > > Gordon JC Pearce MM0YEQ > > > > > Hi Gordon, MM0YEQ > > > > Linear transponder can be built not heavy not to consume a lot > > of power and not too costly. > > > > Read please the following advise of William PE1RAH to my friend > > Roberto IW5BSF for a linear transponder designed for Ham radio > > frequencies to be integrated in CubeSat projects, balloon missions > > or terresterial repeaters. > > > > http://www.leijenaarelectronics.nl/leijenaar_electronics_009.htm > > > > Dear Roberto, > > > > The transponder I sell as a complete (pre-made) package in which the > > programmer and software all is included. > > > > It is made of very small SMD parts, 0402 size, that can only be > > soldered with profesional reflow oven (which I use). > > > > The whole package includes: > > > > Transponder on profesionally milled evaluation board (fully tested) , > > power supply, programmer included all cables, example source code, > > and manuals. > > > > The transponder will be delivered with a testing report. > > > > I can deliver it for the price of 1800 Euro (excluded shipping cost). > > > > The transponder will be operational in a matter of minutes (the time > > to connect antenna cables and power supply). > > Manufacturing time is about 2 weeks, because of testing time to > > guarenty the quality. > > > > Datasheet and information you can find on my website: > > > > www.leijenaarelectronics.nl > > > > Thank you for your interrest and kind regards, > > > > William Leijenaar, PE1RAH > > Leijenaar Electronics > > Bergmanshofweg 2 > > 5926 RH Venlo > > The Netherlands > > ---

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shoe box sats
by Nick Pugh 18 Oct '12

18 Oct '12

>Hi Gus, 8P6SM >I agree with you ! >Unfortunately there is now a huge trend to build more and more of these shoe boxes (CubSat) to fly around earth. >I would not call them satellites, As a member of a cubesat team let me put in my $.02 1. At the University of Louisiana help the transition of students to engineers. 2. We fulfill the mandate of the FCC by training the next generation of engineers 3. We license about 10 students every year and expose ham radio to 20 more students 4. When these students go through the program they can build something and learn by doing In closing I believe the amateur community is well served by the shoe box designers. If we want amateur payloads we should do 1. Have off the shelf radios in their form factor that are very cheap 2. Be ready to mentors most school lack radio resources 3. Team up with schools that are developing propulsion systems ( our ride to HEO) Thanks nick ars k5qxj EM30xa 30.1 n 90.1 w cell 337 2582527 office 337 593 8700

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Re: Amsat Journal?
by ryan woods 18 Oct '12

18 Oct '12

Ok thank you Gould can't wait to start getting them again! Sent from Yahoo! Mail on Android

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Re: OH2AUE P3E transponder demo video
by i8cvs 18 Oct '12

18 Oct '12

Hi Robert, WB5MZO I don't believe that the linear transponder built and sold by PE1RAH for a price of 1800 Euro is a flight space ready device because normally it need to be tested at minimum into a vacum chamber at low and high temperature and also vibration test and so on to be qualified for a flight space launch. 73" de i8CVS Domenico ----- Original Message ----- From: R Oler To: domenico.i8cvs(a)tin.it Sent: Thursday, October 18, 2012 8:10 PM Subject: RE: [amsat-bb] Re: OH2AUE P3E transponder demo video Is the cost you mentioned for a flight space ready device? Robert WB5MZO > From: domenico.i8cvs(a)tin.it > To: gordonjcp(a)gjcp.net; amsat-bb(a)amsat.org > Date: Thu, 18 Oct 2012 17:28:20 +0200 > Subject: [amsat-bb] Re: OH2AUE P3E transponder demo video > > ----- Original Message ----- > From: "Gordon JC Pearce" <gordonjcp(a)gjcp.net> > To: <amsat-bb(a)amsat.org> > Sent: Thursday, October 18, 2012 8:47 AM > Subject: [amsat-bb] Re: OH2AUE P3E transponder demo video > > > What I am referring to is linear transponders. They're heavy and > > consume a lot of power. We need to either devise a new way of doing > > that, that doesn't involve heavy inefficient linear amplifiers, or stick > > to something like FM or GMSK where a little lightweight PA that doesn't > > dissipate most of the input power as heat will do the job. > > > > It depends what you're trying to achieve. I'll respond to Domenico's > > comments here, too. > > > > Gordon JC Pearce MM0YEQ > > > Hi Gordon, MM0YEQ > > Linear transponder can be built not heavy not to consume a lot > of power and not too costly. > > Read please the following advise of William PE1RAH to my friend > Roberto IW5BSF for a linear transponder designed for Ham radio > frequencies to be integrated in CubeSat projects, balloon missions > or terresterial repeaters. > > http://www.leijenaarelectronics.nl/leijenaar_electronics_009.htm > > Dear Roberto, > > The transponder I sell as a complete (pre-made) package in which the > programmer and software all is included. > > It is made of very small SMD parts, 0402 size, that can only be soldered > with profesional reflow oven (which I use). > > The whole package includes: > > Transponder on profesionally milled evaluation board (fully tested) , > power supply, programmer included all cables, example source code, > and manuals. > > The transponder will be delivered with a testing report. > > I can deliver it for the price of 1800 Euro (excluded shipping cost). > > The transponder will be operational in a matter of minutes (the time to > connect antenna cables and power supply). > Manufacturing time is about 2 weeks, because of testing time to guarenty > the quality. > > Datasheet and information you can find on my website: > > www.leijenaarelectronics.nl > > Thank you for your interrest and kind regards, > > William Leijenaar, PE1RAH > Leijenaar Electronics > Bergmanshofweg 2 > 5926 RH Venlo > The Netherlands > --- > > _______________________________________________ > 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

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Re: AMSAT-BB Digest, Vol 7, Issue 346
by Tom Gentry 18 Oct '12

18 Oct '12

Rubbish! I built my own antennae from wood and welding rod, cut my own phasing lines and built a computer from scraps to run the tracker software. I did have an AZ-EL motor set from the 80s but it had to have the controller rebuilt and the case crack repaired. My old radio FT726 doesn't have computer control so I am building a softrock SDR station with transverters for 2m and 70cm and my goal is to have it track and adjust for doppler while I make contacts whilst I am busy during a 7-10 min LEO pass. So far I have learned about Yagi antenna design, transmission line theory and practice, Smith charts (impedance and admittance), software defined radio theory, full duplex SDR radios and multi-user transponders, so if that's what you call throwing technology at the problem then color me guilty and PO.d at your comment. 73, Tom K5VOU On 10/18/2012 10:00 AM, amsat-bb-request(a)amsat.org wrote: > Message: 2 > Date: Wed, 17 Oct 2012 22:38:36 +0100 > From: Gordon JC Pearce<gordonjcp(a)gjcp.net> > To:[email protected] > Subject: [amsat-bb] Re: OH2AUE P3E transponder demo video > Message-ID:<507F255C.9030008(a)gjcp.net> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed <snip> In any case, the challenge has changed. I don't see any real challenge in the "hard sats", because the "hard sat" brigade all seem to use massive aerial arrays, with computer-controlled steering and tuning. I don't see what's "hard" about it - it's just throwing technology and no real skill at the problem. Once you've figured out the mysteries of the crappy proprietary software that people use to steer the aerials and tune the rig, it's point-and-shoot. The FM sats can be worked with something as simple as a dual-band handie and a homebrew crossband pair of Yagis - and a great deal of operator skill. No, the challenge today is this - are you ready? The challenge is: Get something flying, for less than the GDP of a small nation. There, I've said it. It's down to money. You know what else I'm going to say? There is almost certainly never going to be another amateur HEO satellite. There, I've said *that*, too. Want to know why? Because we're a tightfisted bunch and no-one is going to fly us for very nearly free. The HEO crowd have some amazing technology, but it's going to cost a fortune - a very large fortune - to fly these Death Star-sized satellites *at all*, never mind into HEO. The future is small satellites, where we will have to cram as much radio into a tiny cubesat payload as we can. Even then it's going to be expensive, so we're going to need to look at countries that are developing their space programme to get launches - and that's going to be India, Pakistan, Iran if they get their shit together, maybe Israel if we can get them interested in anything other than "observation" satellites and probably one or two others. Maybe some wealthyish African countries will get in on it, like the DRC or Kenya. We're going to have to try coming up with clever satellites, rather than flying a bent-pipe box the size of a fridge. No-one is going to want to lift that, without us paying full price. > -- Gordon JC Pearce MM0YEQ

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Re: OH2AUE P3E transponder demo video
by John Becker 18 Oct '12

18 Oct '12

At 02:13 PM 10/15/2012, you wrote: >"C" band stuff! I thought "S" band was difficult...I want hard sats not easy sats! > >73 Bob W7LRD Me too. Enough with the UHF up and VHF down or vice versa. John, W0JAB

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