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Re: 10mtr and Galileo
by Miroslav Kasal 12 Sep '06

12 Sep '06

Hi Domenico et al., You are right. Centers of the analog pass-bands are: L1 = 1268.800 MHz L2 = 1263.300 MHz Pass-bands are +/- 75kHz around these frequencies. 73, Mirek OK2AQK Date: Mon, 11 Sep 2006 16:29:18 +0200 From: "i8cvs" <domenico.i8cvs(a)tin.it> Subject: [amsat-bb] Re: 10mtr and Galileo To: "Miroslav Kasal" <kasal(a)feec.vutbr.cz>, "AMSAT-BB" <amsat-bb(a)amsat.org> Message-ID: <003a01c6d5ae$ab684140$0201a8c0(a)tin.it> Content-Type: text/plain; charset="iso-8859-1" Hi Mirek, OK2AQK Tank you for this information and so as already published by AMSAT-DL in the following document http://www.amsat-dl.org/pic/gallery2/main.php?g2_view=core.DownloadItem&g2_i temId=6497 For the linear mode the uplink L1 will use 1268.725 to 1268.875 MHz while the Galileo Alternative L2 will use 1263.225 to 1263.375 MHz Please confirm. Best 73" de i8CVS Domenico

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Re: 10m band kibitzing
by jari.koivurinne＠mail.htk.fi 12 Sep '06

12 Sep '06

>Hi AMSATs, > >I like to give my comment on the message of N6GHZ. >As far as I know there will be a 29MHz receiver on >P3e. >Maybe things have changed but at the last designer >meeting in Marburg, where I showed my MODE-UV >prototype it was discussed. > >At that time the 29MHz receiver was a task of the >Finish group. However this group was very busy with >other parts of the satellite and 29MHz was on low >priority. Another problem was the physical space, and >it was agreed that is should join a small space in the >MODE-UV box. > >73 >William >--- Early P3E-plan had the 10m band receiver and an engineering model was made by Janne OH1LRY. I designed and made a matching diplexer to use simultaneously the L-band receiving helix as a 10m short whip antenna. I modeled the helix tuning unit with some excessive field test. However the commission dropped the 10m RX to save space and make the concept not so complex. Also there was discussion about poor link budget and maybe the L-band helix antenna have to change to other type that made the things uncertain. Besides the short L-band helix was not really good antenna on 10m ;-P So there is no 10m RX aboard. We are having hard times to fit all parts inside that satellite. Space is a bit tight and almost all components must be SMD. At least in our 05E-module size 22x34x3.3cm (8.6x13.3x1.2 inch) which contains S-band receiver, X-band transmitter, switching power supplies, Linear-IF processors, Coherent ranging processor and all control circuits. But now we have some spare parts to build a simple small satellite! -jari oh3uw ----------------------------- VIRPI - http://virpi.net -----------------------------

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L band gain
by w7lrd＠comcast.net 12 Sep '06

12 Sep '06

Hello My lesson in humility is over. I need more gain/power. If I put a 5 1/2 turn helix in front of a 36x30 primestar dish how much gain would that give me on 1.268 Ghz ? My current antenna is a directive systems DSH23-12 (12 turn helix) and is given as 14.5 dBic. 73 Bob W7LRD Seattle

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FIRST L/S ATTEMPT
by w7lrd＠comcast.net 12 Sep '06

12 Sep '06

Hello Bob will be making his first L/S attempt on AO51 this evening on orbit #11568 (not sure I have that correct). It's the orbit that goes right (South to North) up the middle of the country. I have an IC-1271A running 10 watts through 50 feet of LMR400 to a 12 turn helix. S band is a 3 foot primestar/helix feed/3731 d/c. Looking for contacts and/or reception results. I may need a larger antenna, I have a 3 foot, a 4 foot and 12TVRO dish that are "waiting" for something. This is really a kick! 73 Bob W7LRD Seattle

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First L/S QSO!!
by w7lrd＠comcast.net 12 Sep '06

12 Sep '06

I worked AK5V for my first L/S effort. Though several others did not hear me or said "you're too weak om". Clearly I have some work to do. What is the recommeded erp for AO51 L band?? My little 10W through 50 feet of coax to a 12 turn helix is just not cutting it. In planning for the next HEO I will have to make improvements. What are you L'ers using? I will be on the next pass. 73 Bob W7LRD Seattle

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Symposium Registration Reminder
by Emily Clarke 12 Sep '06

12 Sep '06

Just a reminder that if you are going to register for the Symposium it will be a good idea to do it on or before September 15th. On September 16th the price increases from $45 to $55. 73, Emily --------------------------------- N1DID formerly W0EEC - CM87tm Support Project OSCAR - http://www.projectoscar.net

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H-IIA F10 launch successful
by Mineo Wakita 12 Sep '06

12 Sep '06

H-IIA/F10 was successful in the launch at 04:35 UTC 11Sep06. http://www.jaxa.jp/missions/projects/rockets/h2a/index_e.html --------------------------------------------- Name: Mineo Wakita / JE9PEL, JAMSAT member Mail: ei7m-wkt(a)asahi-net.or.jp URL : http://www.ne.jp/asahi/hamradio/je9pel/ QTH : Yokohama Japan, GL:pm95tj Date: Sep 12, 2006 ---------------------------------------------

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Planning for the future, downconverter options.
by Vince Fiscus, KB7ADL 12 Sep '06

12 Sep '06

As Eagle won't have S band downlinks, I'd like to know if there is something simple out there that I can use in place of my AIDC 3731 downconverter to receive the higher frequencies on my 3' dish. I'd like something low cost, compact and simple like the transystems units were.

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Re: 10m band kibitzing
by William Leijenaar 12 Sep '06

12 Sep '06

Hi AMSATs, I like to give my comment on the message of N6GHZ. He wrote: "I am tried to get 10 metres looked at again by the AMSAT team but my comments have gone unanswered. I have also tried to query Peter to get an understanding why 29 MHz was dropped on P3E but no answer there either." As far as I know there will be a 29MHz receiver on P3e. Maybe things have changed but at the last designer meeting in Marburg, where I showed my MODE-UV prototype it was discussed. At that time the 29MHz receiver was a task of the Finish group. However this group was very busy with other parts of the satellite and 29MHz was on low priority. Another problem was the physical space, and it was agreed that is should join a small space in the MODE-UV box. As I had the MODE-UV transponder under my control I managed to join some PCB units together to make more space for a 29MHz receiver. Finally I even made the 29MHz receiver unit myself as I had the whole transponder here at home. The whole MODE-UV flight-mode transponder included the 29MHz receiver unit I delivered at AMSAT-DL in May 2005, as the first flight ready transponder for P3e. Unfortunatly the 29MHz I had to take out as the Finish group was choosen to design it, what I respect fully. The transponder included the 29MHz receiver can be seen on my webpage at the following link: http://www.qsl.net/pe1rah/p3e_mode-uv3/p3e_mode-uv3.html What supprizes me is that you tell me that 29MHz is not on P3e... I hope this is a mistake as I still have the receiver here at home for P3e in case the Finish group can not deliver their 29MHz rx. Unfortunatly I also didn't hear any sign from AMSAT after I delivered my MODE-UV flight-model. I mentioned many times that I will support in case of MODE-UV problems, as I do it for the world-wide AMSAT community in general... like I did with VO-52. This promise still stands... What ever will not fly on P3e and is of my design will be available for any other (long lifetime) amateur satellite project that has a good chance to fly and will support world-wide ham community. In case there is free satellite space available on an interresting OSCAR orbit (AMSAT or none-AMSAT satellite) I might sponsor a mode-uv or mode-vu linear transponder of my own design. I also hope some more 23cm uplinks will be available on satellites. I would love to test my 200W PA on a Ground Plane antenna, and see how it works on the amsats (and use this band widely so other none-ham users know ham activity is in this band (and hopefully they disapear soon) :o) Lets make some more sats like VO-52... I only need the box, solar panels and a rocket... The radio and antennas I will take care of ;o) 73 William --- __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Re: 10mtr and Galileo
by jules＠g0nzo.co.uk 12 Sep '06

12 Sep '06

Just for the record, the first Galileo satellite has already been launched: http://news.bbc.co.uk/2/hi/science/nature/4566264.stm Also there was a study made by the UK microwave group (the body representing UK amateur interests above 1GHz), which makes interesting reading. It suggests that the signals from Galileo would have little impact on terrestrial/EME 23cms opperation. Obviously the conclusions woule require a little re-interpretation, with respect to satellite based reception. But as Galileo transmissions will presumably be aimed at the earth, so that any amatuer satellite will receive signals greater than that on earth, for a minute part of it's orbit, I would think that the conclusions drawn would still be valid. It's an interesting read: http://www.microwavers.org/papers/iaru/C5-13_Galileo.pdf Jules G0NZO >Speaking of allocations being taken away, I just can't fathom the AMSAT >decision to drop L-Band up because of the "Galileo Affair." Now that's a >decision based on "crystal ball engineering" and not fact. I've even read >that if Galileo ever was launched - and that appears in the latest press to >be questionable" the US "would has threatened to shoot them down!" > >Regards...Bill - N6GHz

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