[amsat-bb] Re: A0 40 replacement
Hi AMSATs, Commercial satellites were very expensive... but we hams find a way to get our own satellite, for much cheaper price. Launches are very expensive now... but maybe there is a way we can do it cheaper ourselves (or with help from rocketeers) ? (Ofcourse not aiming for AO40 size... maybe starting with pico-sat first.. and use rocket body as antenna to save on that...). Just some idea 73 de PE1RAH, William ___ Sent via AMSAT-BB@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
[amsat-bb] Re: V/U Linear Transponder
Dear Tanan, I am sorry when I didn't noticed your email before. The choice between FM transponder or linear transponder depends on the purpose of the satellite. FM transponders can only adress one station at a time (the one with the biggest uplink power will win), and can only do FM, which is available to all hams, which makes it even more crowded on this one channel. On the other hand it is easy to make (one chip solution). Linear transponders use some more DC power, but can address multiple stations, in multiple modes (CW, SSB, FM, BPSK, etc), it also leaves room for new (experimental) modes (as long as it fits in the bandpass). The disadvantage is the more difficult RF circuitry, which needs quiet some RF knowlegde and RF experience. To overcome these disadvantages I put my experiences in the developed of the small linear transponder LE005-R2. It can save development time and development cost on (satellite) projects a lot. Kind regards, William Leijenaar PE1RAH www.leijenaarelectronics.nl From: Tanan Rangseeprom HS1JAN hs1...@tamsat.org To: amsat-bb@amsat.org; leijenaarelectron...@yahoo.com; PE1RDW s...@pe1rdw.demon.nl; g0...@aol.com Cc: thid...@gmail.com; hs5...@hotmail.com; chawa...@station.in.th; hs2...@gmail.com Sent: Tuesday, July 30, 2013 6:04 PM Subject: Re: [amsat-bb] V/U Linear Transponder Dear All Thanks respond for help to me 1.Thailand has regular to forbid for transmitt UHF band but can receive the signal for amateur radio satellites only. we need to used VHF band same like transponder of Japanes (FO-29) , AmSat AO-51 , Saudiarabia SO-50 and other satellites. for interference from China Thailand and other countries on VHF is normal. 2.Ok, I do not have knowledge 100 khz bandwidth is too much for the over power. please advice me for 30 khz uplink 145.90-145.92 MHz VHF / 435.10 - 435.12 MHz UHF of liner transponder. 3.We have to design FM repeater use to modify HX1 / RX2A RADIOMETRIX VHF / UHF transmitter module we have change x-tal to 145.90 MHz / 13.59 MHz and used MC3361 with x-tal 10.245 MHz and CML IC FX465 CTCSS Encode/Decode build test it to be successful. We and technical team of TAMSAT group would like to help and advice for circuit diagram of V/U transponder same like transponder of Japanes (FO-29) and other satellites. We had mail to Mr.William Leijenaar PE1RAH but do not have respond feedback. Mrs Thida of 100watts ham radio magazine of thailand sugges me to know Mr.William.because she meet him on Tokyo ham fair 2009. On this time we and technical team of TAMSAT group need help very urgent. we need advice of circuit diagram or datasheet IC for build V/U Liner transponder for payload 1U cubesat of JAISAT satellite project. best regards Tanan Rangseeprom HS1JAN Project Manager of JAISAT-1 member of RAST email : hs1...@tamsat.org - Original Message - From: g0...@aol.com To: hs1...@tamsat.org Sent: Monday, July 29, 2013 5:24 PM Subject: Re: [amsat-bb] V/U Linear Transponder Dear Tanan. Thanks for the mail via AMSAT.org My name is David Bowman G0MRF and I'm a member of the team building FUNcube, due for launch this November. I can help with transponder design, but there are some points which you need to consider. 1) The use of V band for the uplink will be a poor choice for your location. The interference from China and other countries on 145MHz will mean the transponder will not be usable. Using U band for the uplink is a much better choice. 2) The 100kHz bandwidth is too much for the typical power available from a CubeSat. If you get your RF team to do a link budget analysis, you will see the cubesat power budget will not support 100kHz of bandwidth. Ususally 30kHz is as much as you can do with a 1U cube. 3) You may want to consider a FM 'repeater' as there is now only 1 in orbit, while there are several linear transponder satellites ready to be launched. The FM design will allow you to run a very efficient power amplifier (70%) and power can be saved over oceans and areas of low population by using a 67Hz access tone (CML FX465) I can assist with design but would need to know if you are planning a 1U 2U or 3U design. William PE is good, but will probably just offer to sell you a transponder. Regards David G0MRF some old info is available at www.g0mrf.com/transponder.htm The attached powerpoint has some pictures of the UV transponder and other boards in FUNcube from AMSAT-UK ___ Sent via AMSAT-BB@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
[amsat-bb] Re: PA5RWE passed away
Hi AMSATs, I met Chris only a few times, but he was always very devoted to the ham hobby. We shared the interrest in amateur satellites, and he made records of the satellite downlink from his shack in The Netherlands while Dirk (ON1DLL) and me were travelling around Europe and making satellite contacts. You will not be forgotten. My condolences to his family and friends, William Leijenaar, PE1RAH ___ Sent via AMSAT-BB@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
[amsat-bb] Need some ears to listen for VO-52, Northern EU, Canada, USA...
Hi AMSATs, I received the news that VO-52 will be switched on in a couple of hours from now, at 13:50UTC, (03-March-2012) Unfortunately the satellite will not pass over central Europe, and I am not able to check the status the first two orbits. I am looking for hams in Russia, Northern Europe, Canada, USA, or others that can listen for VO-52 right after it is turned on. ! ! ! Please don't use high uplink powers !!! (We don't want it to rise temperature very fast just after cold switch on) ! ! ! Please listen for the CW beacon at 145.860, which is a good reference. (Audio records and reports are very welcome at ISRO and myself) 73 de PE1RAH, William Leijenaar --- ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Need some ears to listen for VO-52, Northern EU, Canada, USA...
Hi AMSATs, There was a slip on my fingers. The date should be 13-March-2012. (Thanks to 9A2EY, Zeljko who noticed my mistake) 73 de PE1RAH, William Leijenaar Hi AMSATs, I received the news that VO-52 will be switched on in a couple of hours from now, at 13:50UTC, (03-March-2012) Unfortunately the satellite will not pass over central Europe, and I am not able to check the status the first two orbits. I am looking for hams in Russia, Northern Europe, Canada, USA, or others that can listen for VO-52 right after it is turned on. ! ! ! Please don't use high uplink powers !!! (We don't want it to rise temperature very fast just after cold switch on) ! ! ! Please listen for the CW beacon at 145.860, which is a good reference. (Audio records and reports are very welcome at ISRO and myself) 73 de PE1RAH, William Leijenaar --- ___ Sent via AMSAT-BB@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
[amsat-bb] Quadrifilar Helix antenna question
Hi AMSAT's, Because I can not set up my rotor/elevation system at the new QTH, I try to get some omni antenna's to be active on the OSCAR's. I made a 2m version and 70cm version from some calculation website (www.jcoppens.com) on the internet. Unfortunately both were too low resonant in frequency. Cutting the lengths shorter, (to get a higher resonance frequency) didn't work well, as I got too short elements at a certain time and the mechanical construction didn't allow more shorter elements. So I started all over again, this time taking the well known Rothamel antenna book as example. There is an GPS example which I re-calculated to a 70cm version and combined it with an infinite balun that is also described one page further. For the elements (one element as infinite balun) I used Aircell-7 coaxial cable. When I measured this antenna it surprisingly had also a too low resonance frequency, some 60MHz lower then the expected 435MHz... Another thing I noticed is that the return loss is around 10dB best case for this kind of helix antenna (that's at 375MHz resonance). It gets better when I touch the elements, but that should not be the way it should work... Does anyone has experience with quadrifilar helix antenna's on 2m and 70cm for TX ? When using the infinite balun principle, should it be a number of 1/4 wavelength ? or should it fit the antenna element length ? Because the quadrifilar element length (=infinite balun length) was shorter than 3/4 lambda length. Due to this fact I actually expected a higher resonance frequency, but it went out the opposite way. FYI: The supporting of the elements is all done with PVC tubes, to avoid any metal influence. Kind regards, 73 de PE1RAH, William Leijenaar --- ___ Sent via AMSAT-BB@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
[amsat-bb] OSCAR or not OSCAR ?
Hello AMSATs, As we all know OSCAR is the abbreviatie of Orbiting Satellite Carrying Amateur Radio. To my opinion the function of OSCAR satellites is to facilitate communication between amateur radio stations using amateur radio frequencies and/or do experiments on those radio frequencies. Can someone tell me how it is possible that many of the newer small satellites get a license to use ham radio satellite frequencies for only broadcasting data ? Many of these satellite missions are even not ham related, and those satellites only have a broadcast (downlink) radio onboard. Is this nowadays seen as amateur radio communication ? The word Education I read in many of the university CubeSat projects. Doing experiments on ham radio frequencies is like education, and I fully support this even when it is only available as a downlink at a CubeSat. When it comes to the education of building a satellite, with no ham related experiments, and where the amateur frequencies and the amateur community is used to collect only none ham payload data, I don't see this as a ham satellite. Then a 433MHz remote control toy-car should also be named a ham radio. We just ask one of those ISS astronauts to throw this toy-car out of the space station and we have another amateur satellite :o) I just wonder where is the border between an OSCAR and a satellite that uses ham radio frequencies for downloading its (none ham) payload data ? 73 de PE1RAH, William Leijenaar ___ Sent via AMSAT-BB@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
[amsat-bb] Re: OSCAR or not OSCAR ?
Hi Stefan, So the answer on my question if my 433MHz toy car, when I put it into space, can get an OSCAR number is YES! According to the AMSAT website you mentioned of course... :-P - My question was not specific if these satellites can or can't get an OSCAR number. My intention was more if they should be scheduled as a ham-sat (and with that using ham frequencies). I would recommend you to read the following IARU website! http://www.iaru.org/satellite/prospective.html (especially section VI. OPERATIONAL GUIDELINES) It says the following: Organisations building satellites should compare their mission plans to the requirements of the amateur-satellite service. Then, they should determine if it is possible to comply with the requirements of the amateur-satellite service or if licensing and operation should be in some other radio service which is more consistent with the nature and requirements of the mission. A. The purposes of an amateur satellite should be: (1) To provide communication resources for the general amateur radio community and/or (2) To conduct technical investigations in all respects consistent with the Radio Regulations. [See RR S1.56 and RR S1.57.] I have great doubts with many off those CubeSats, if they comply to number (1) The only communication resources they provide is for themselves by a cheap downlink system, by using hams to receive data for them. This is not for the general amateur radio community as mentioned in number (1)... The option they have is to go to some other radio service which is more consistent with the nature and requirements of the mission. 73 de PE1RAH, William Would recommend reading the info on AMSAT's website! http://www.amsat.org/amsat/amsat-na/oscar.html Stefan, VE4NSA ___ Sent via AMSAT-BB@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
[amsat-bb] Re: There's no usable satellites
Hi Andras, I totaly agree with your point. To turn the rudder a little bit more into ham radio dx direction I designed several years ago a small CubeSat sized linear transponder. (Just google LE005-R2 and you will find it). The idea was to make it off the shelve available for the Cubes, as it is quiet complex to design for students. Surprisingly the interrest from these Cube groups was/is very very low. (Most requests are from privat hams ! for using it on a mountains or balloon). CubeSat groups seem to prefer FM, AX25, and not to much difficult ssb stuff they can not use and test themselves. Most of these small sats are under the name off education, but in the background a huge business sector is available (just google Cubesat shop and enjoy). Because of this I believe the AMSATs none-profit status is a huge disadvantage, and it is very hard to get a HEO into orbit. AMSAT should have kept the RF payload (of a big satellite), and give away some spaces to universities, sharing the ham radio payload. Now the spaces are given away as separate small boxes (cubesats) that all have similar RF systems (FM and 1k2/9k6 AX25). Why not assemble the cubes all together as one big satellite, where AMSAT provides the common digital download payload + some extra linear transponder ??? In this way there is more space for university experiments, and the RF is done by people who have many experience in amateurs satellite radios. But best of all is that we have our own payload added. (Some less frequencies then AO40 but possibly in a MEO/HEO). Just an idea, 73 de PE1RAH, William Leijenaar Gentlemen, I have spent too much money on an FT-847! I had better to buy a well equipped HF transceiver instead! There is practically no usable satellites -except for AO-7 and VO-52. The problem is that you can find always the same stations on them. F2IL is in my log about 300 times... Spending money on FM satellites were made according to long term plans of IARU, ARRL and AMSAT which had been a dream of handling emergency traffic using hand-held equipment and antenna -as far as I know. Satellite activity is seriously declining! gl de ha6nn Andras ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Russian geostationary satellite locator - with AO-7, AO-27 and FO-29
Hi Thomas, Somewhere in the year 2001 I have also been busy with this oscarlator system. It is very interresting and works quiet well, when you have some experience in using it. It looks outdated, but for ham radio it is good enough, and the most advantage is that is does not use power, cables or fragile parts/software. On my older website there are still some maps and graphs available, which might be usefull to other hams. Please check the link: http://www.qsl.net/pe1rah/oscarlator.htm 73 de PE1RAH, William Leijenaar ___ Sent via AMSAT-BB@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
[amsat-bb] Re: KickSat - a personal spacecraft of your own in space
Hi Steve, I don't agree that the more people that get a taste of satellites, the better. AMSAT will then turn from quality into quantity, with a high risk that it will get out of control (RF wise and launch space wise) with so many small sat projects. Now everything is scattered into small satellites (mostly CubeSat) and the big satellites that can unite the international AMSAT community are pushed backwards into the big crowd. Every real AMSAT ham still knows about the AO10, AO13, AO40, FO20/29... even after they stopped working. I wonder how many will remember all those Cubes... I would more like to see that people get interrested in the technology and try to get there ham license because of interrest in technology. Nowadays a license is not really needed, just a dongle and software and you can say you are working on satellites. Nice for students to get a taste from the small cookies, but not to have a big meal when you get more hungry, as there is not many big food available (big satellites). I really support the idea to help newcommers, but in my opinion it is getting out of balance... (I believe due to the commercial and publicity value of those Cubes...) 73 de PE1RAH William Leijenaar William, I have wondered about this, too. I have come to think of these as seeds. Seeds that plant the idea of satellites in the heads of people and make them want larger, better (heo) systems. They won't last that long, so the idea of RF pollution isn't really there. And, if the sat sub-band can have a section devoted to these cube sats such that they aren't everywhere, even better. The more people that get a taste of satellites, the better. --STeve Andre' wb8wsf en72 ___ Sent via AMSAT-BB@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
[amsat-bb] Re: KickSat - a personal spacecraft of your own in space
Hi AMSATs, I really wonder if this ever can and will be launched. AMSAT started with eperimental communication systems on the early oscars, and grown into highly complex satellites like AO-40, which was a real achievement for ham radio amateurs. However recent years there is a big trend on CubeSats, of which most are bleep-sats as they only send digital data (as cheap downlink ?). Luckily not all CubeSats are like that :o) At least these CubeSats are under some kind of control, and don't survive very long or can be switched off to minimize RF polution. When I see the idea of 100 chipsats that will all send digital RF signals I wonder where amateur satellite hobby will go into. I see these ChipSats more like RF polution and I believe you can better put your money and effort in designing a real communication satellite. I wonder what is the mission of these 100 chips ? (commercial ? publicity ?) Is there any technology thing we learn from this ? 73 de PE1RAH William Leijenaar ___ Sent via AMSAT-BB@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
[amsat-bb] Questions about use of PC104 connector for CubeSat boards
Hello AMSATs, Work and home situation kept me away from having any ham time. But recently I had some time to continue with upgrading my LE005 transponder design with a PC104 connector (or is it PCI-104 ?), and some other features ;-) The PC104 is a good choice for having a standarized inter connection system on CubeSat projects. However, I seen some deviation in the placement standard of this PC104 connector. From the following website I read: http://www.cubesatkit.com/content/electronics/bus.html The CubeSat Kit Bus utilizes the same physical connectors as the industry-proven PC/104 bus, but in an alternate physical location so as to avoid unintentional damage to PC/104 or CubeSat Kit modules. With my focus on: ...in an alternate physical location... I would like to know what this possition is, and if this is now the golden standard in CubeSat world ? My next worry will be the pin configurations. Is there any standard for CubeSat boards ? Next I would like to know how modules are controlled by the data bus. Is it like separate pins for PTT, TX, RX etc... Or with more smart communication with lines like: address bus, data bus, Clock, Interrupt lines etc. (similar to old ISA PC cards) Or maybe with I2C. I keep it to these questions for now... Next questions will follow out of the answers hihi... 73 de PE1RAH William Leijenaar --- ___ Sent via amsat...@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
[amsat-bb] Balloon mission from Austrian hams
Hi AMSATs, Last weekend I was in Austria for holidays, and on the Saterday there was a high altitude balloon experiment done by Austrian hams which included a known transponder to me ;-) My location was near Landeck, some 350km west of the balloon experiment and down in the valley, which made it impossible for me to work the transponder (from my mobile ham station). From the website I understand that the balloon experiment was successfull, but I read some remarks that the transponder unfortunately was not used very much. Most propably because the event was not widely known amoung the hams. What I understand, is that there will be another balloon mission on Saterday (26-June) during the well known Ham Radio event in Friedrichshafen. I will not be at the Ham Radio, but I like to pass on the news to other hams who will be there and have a chance to listen/work the transponder or the balloon APRS. The balloon information can be found at the website of OEVSV: http://www.oevsv.at/opencms/modules/news/20100621_ballon_passepartout_5_nachlese_2010_graz.html?uri=/index.html 73 de PE1RAH, William Leijenaar www.leijenaarelectronics.nl ___ Sent via amsat...@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
[amsat-bb] QubeSat structure question
Dear AMSATs, I have a question concerning CubeSats structures. I am looking for a way to have a total space of a 1U (10cm x 10cm x 10cm) CubeSat, of which 0.5U (10cm x 10cm x 5cm) is used for electronics and battery and the other 0.5U will be used for light weight deployable solar panels. Has this been done before ? Any ideas ? 73 de William Leijenaar PE1RAH ___ Sent via amsat...@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
[amsat-bb] Message from Shanghai Expo 2010
Hello AMSATs, I am sending my greetings to all of you from Shanghai, where I participate at the Ham Radio Expo. It was a great experience to get in contact with the Chinese hams and to promote my linear transponder and also explain more about amateur satellites (which is still not very known to most hams here). I have given a presentation on the first and also on the second day. Twice, as there was a great interrest among the hams to get some more information about the satellite topic :o) I am sure there will be some more hams interrested in amateur satellites at this side of the globe... Unfortunatly I didn't see to many foreign hams, but I was lucky to meet Masato Shibayama, JA7JZS of the Japanese Amateur Satellite Association. We had a nice talk about satellites, and exchanged some new ideas. I also met one Dutch HAM, PA0RWH, which was also nice so far away from home :o) For the ICOM fans I also checked for the new IC-9100 but it was not presented at this ham expo. The only thing the ICOM people could tell me is that it might be available at the next year expo, which is quiet some time to go... Many 73 from Shanghai, William Leijenaar, PE1RAH ___ Sent via amsat...@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
[amsat-bb] Shanghai Ham Radio Expo
Hi AMSATs, Next weekend (3,4,5 April) I will be at the Shanghai Ham Expo, where I will show my transponder design and I will also promote amateurs satellites to the people. Most of the people on this AMSAT-BB will not travel all the way to China to see this expo, but for the people who have the chance to go to the Shanghai Expo it would be nice to meet them. I will be there with two (none-ham) friends that will join and help me. Maybe there will be some amateur satellite hams that will visit the expo and maybe would like to join me ? (I don't mind nationality, as ham radio is like one big world-wide family) 73 de William Leijenaar, PE1RAH www.leijenaarelectronics.nl ___ Sent via amsat...@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
[amsat-bb] China Ham Radio-Shanghai 2010
Hi AMSATs, I wonder if there is any satellite organisation or satellite (cubesat)group with a booth at the China Ham Radio in Shanghai (3-5 April) ? My plan is to be there to present my small linear transponder design like I did at the Tokyo Ham Fair. However, the booths are quiet big (3m x 3m / 10ft x 10ft) to present my small linear transponder. I can not take to many hardware with me on the plane. Maybe there are more people interrested to have a small booth space at the China Ham 2010. Because of that I am looking for people who like to share the booth with me to promote ham radio projects, preferable related to amateur satellite projects. Info about the China Ham 2010 can be found here: http://www.chinahamexpo.com/indexEn.asp With kind regards, William Leijenaar, PE1RAH www.leijenaarelectronics.nl --- Send instant messages to your online friends http://uk.messenger.yahoo.com ___ Sent via amsat...@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
[amsat-bb] China Ham Radio-Shanghai 2010
Hi AMSATs, I wonder if there is any satellite organisation or satellite (cubesat)group with a booth at the China Ham Radio in Shanghai (3-5 April) ? My plan is to be there to present my small linear transponder design like I did at the Tokyo Ham Fair. However, the booths are quiet big (3m x 3m / 10ft x 10ft) to present my small linear transponder. I can not take to many hardware with me on the plane. Maybe there are more people interrested to have a small booth space at the China Ham 2010. Because of that I am looking for people who like to share the booth with me to promote ham radio projects, preferable related to amateur satellite projects. Info about the China Ham 2010 can be found here: http://www.chinahamexpo.com/indexEn.asp With kind regards, William Leijenaar, PE1RAH www.leijenaarelectronics.nl --- Send instant messages to your online friends http://uk.messenger.yahoo.com ___ Sent via amsat...@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
[amsat-bb] Re: LEO/cube sat for sale 8000$
Hi AMSATs, I just read the message about the tube-sats. I was having a look to their options, but when I understand well in the structure there is already a radio integrated ? What is the area that can be used for electronics ? The weight is max. 250 grams, which is no problem to handle one off my LE005-R2 linear transponders (weights only 30 grams). Check it on: www.leijenaarelectronics.nl When there is enough space in the tube-sat to fit my transponder, this is very interresting. Just fill the existing space with Li-ion batts and there you go... Anyone already have experience with these tube-sats ? 73, de PE1RAH William Leijenaar --- Send instant messages to your online friends http://uk.messenger.yahoo.com ___ Sent via amsat...@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
[amsat-bb] Question about vacuum and power module for linear transponder
Hi AMSATs, After many work on my transponder design I decided to put some work in extending my lab. One of the things I liked to have is a vacuum test chamber, to test electronics under vacuum conditions. I have looked around and I see all kind of classes of vacuum pumps, and their equal increasing price. My question is how deep the vacuum has to be to be able to do a valide test on (space) electronics working under space vacuum conditions ? I also would like to know if anyone has experience in SSB mode with the new power modules types from Mitsubishi. Like the RA60H1317M, which can give 60W power on 2m with only 50mW input power. I am looking for some PA behind my LE005-R2 transponder design, to get a small sized high-power linear transponder. The transponder gives 200mW PEP, so the 50mW is no problem at all.I just wonder how linear these Mitsubishi modules are, when using in linear mode. In the datasheet it says that they 'may älso be used for linear mouldation, which doesn't give many guarenty. Any experience with these modules in linear (SSB) mode are welcome. 73 de PE1RAH, William Leijenaar For my small mode-uv transponder design, please check: www.leijenaarelectronics.nl --- Send instant messages to your online friends http://uk.messenger.yahoo.com ___ Sent via amsat...@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
[amsat-bb] Congratulations to CAMSAT
My congratulations to the CAMSAT people with the XW-1 satellite. Now we have another interresting satellite to the list of OSCARs. I can not work the satellite for the moment, but when my station is active again I sure will make some qso's. Still my congratulations to the people who worked on this satellite. 73 de PE1RAH, William Leijenaar --- Send instant messages to your online friends http://uk.messenger.yahoo.com ___ Sent via amsat...@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
[amsat-bb] Stand alone real time tracker
Hi AMSATs, For some longer time I have been looking for a way to get a stand-alone real-time satellite tracking system, without the use of a dual-core, GHz speed power consuming computer :o) To my suprise I didn't found much, only one design called trakbox which can be found E.g at the following tapr website: http://www.tapr.org/kits_trakbox.html Unfortunatly it is not available anymore, and the mean reason I guess is the outdated components. I found out that the design originates from JAMSAT. Maybe someone has data (schematic, PCB layout, source code) of this design ? I wonder with todays highly integrated microcontrollers if there is some modern kind of real-time-tracker available ? I am looking for a system that works just seconds after switching on the power supply and not something that first has to boat 15min and needs a mouse to work. 73, PE1RAH William Leijenaar www.leijenaarelectronics.nl --- Send instant messages to your online friends http://uk.messenger.yahoo.com ___ Sent via amsat...@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
[amsat-bb] Small Mode-UV Linear Transponder Website
Hi AMSATs, For the interrested people, I made some website with more technical information of my small linear transponder design. It can be found at: www.leijenaarelectronics.nl 73 de PE1RAH William Leijenaar --- ___ Sent via amsat...@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
[amsat-bb] Re: All Satellites
Hello AMSATs, I agree that APRS can have a higher power transmittter, because of its small amount of time to get the data broadcasted. However the workability with the HT and whipe antenna is only an advantage for the downlink. For the uplink there will be no advantage. Personally I believe that making a satellite easier accessable will also decrease its functional efficiency. This is especially the case for satellites with limited user access, like single channel FM satellites. This also includes APRS. The same issue is valide for a geostationary satellite, with the addition that a geostationary satellite would be overloaded in short time by more and more stronger stations as fixed antennas can be used. Only the uplink power level would be the parameter of competition. Resulting in a privat chat satellite for only few (high power) users. Satellites for emergency communication sounds very interresting, and personally I believe it can give a great advantage when doing it well. The question is only what will work well in an emergency situation. It will depend on the needs and the availability of equipment in the effected area. I believe that digital communication will be of limited use as you need also a computer, modem, keyboard, screen, software etc besides your radio. Only one thing missing and you will not be heared. I don't say it is impossible, but to make the system work the ground stations need to be made more easier somehow. Maybe HT APRS in combination with voice to text conversion (and opposite) would be an idea ? Besides the technical difficulty there is also the (human) organising factor. I heared some ideas about an easy to access geostationary satellite with high power downlink. That would be great, but without any communication control it would be like the FM LEOs where everyone talks at the same time and nobody is able to get there message through. It might be solved with a central control centre on a safe place (maybe by the Amateur Radio Emergency Service ?) that has control over the satellite radio and uses it as a remote radio ear in space. In this way it is also possible to use one frequency simplex system. Just some ideas, 73 de PE1RAH, William Leijenaar --- ___ Sent via amsat...@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
[amsat-bb] Help with Renesas uController board
Hi AMSATs, After using the MSP430 types in my latest transponder designs I am now playing with some Renesas uController board, which I bought in Japan. It is more to get a feeling of these controlers for possible future projects. I don't know if it is only me, but it always costs me days work to get my first program run on a new controler, because the software doesn't want to upload my few bits program into this chip... The same now with my renesas H8/300H HD64F3062BF testboard. It works well with the demo program, which has a .MOT file that I can upload via the USB connection. When I make my own code, I can not get it to make the .MOT file, so nothing to upload. Any Renesas guru that might know how I can get it to convert to a .MOT file ? My kind regards, William Leijenaar, PE1RAH --- ___ Sent via amsat...@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
[amsat-bb] Re: Improving satellite reporting
Hi AMSATs, The tinny transponder design is finished and tested. I can make copies when there is interrest. My visit to Ham Fair in Tokyo was for me a kind of milestone to finish the design and make it public to the people. (I like to design something well done, before make it available to others, this avoids modifications and extra work later). It is not easy to make the LE005-R2 transponder design without having the right tools. This is also the reason why I cannot sell it like a kit for people to solder at home. The design is made at a profesional level (as development engineer I am dealing with it dayly) and can be made with use of a pick and place machine and reflow soldered for large quantities in a factory when needed. This is only profitable at large quantities. For small quantities its cheaper and faster to do it with my small reflow system. The quality is guarenteed as I can do manual inspection and full testing myself. The next step is doing space environment tests, but that takes some more time and money. In case you have a working thermal vaccuum chamber in your garage, let me know ;o) The LE005-R2 is designed for space environment but not officially tested yet. However, the design is well suited for applications like terresterial transponders. 73, with kind regards, William Leijenaar, PE1RAH --- - Original Message - From: Bruce Robertson ve9...@gmail.com To: AMSAT-BB amsat-bb@amsat.org Sent: Thursday, September 03, 2009 8:04 AM Subject: [amsat-bb] Improving satellite reporting [snip] (Similarly, I hope that William's extraordinary vision in building his transponder board might, after broad testing and examination, be validated by it becoming an 'AMSAT' off-the-shelf product. With William's approval, let's appeal for the bucks to have a team of people replicate these, test them, and set them up as temporary terrestrial repeaters around the world. We'd much more easily convince a cubesat team to include one of these if we could say one was running uninterrupted in Toronto for a year, or if we could have them do a QSO through one in a live demo!) 73, Bruce VE9QRP Hey, if William will make the boards available, I'll start building one tomorrow!!! 73, George, KA3HSW ___ Sent via amsat...@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
[amsat-bb] PE1RAH pictures from Ham Fair Tokyo
Hi AMSATs, Please check the website of Alan, GM1SXX who has made a picture gallery for me of the pictures made at the Ham Fair in Tokyo. http://www.pe1rah.observations.biz/index.htm More pictures will follow, so check it up again, after some time. I have also seen the new ICOM 9100 at the ICOM booth on the Ham Fair here in Tokyo. The rig looks very nice, but when I asked some technical details they said that they still working on it and that it is not finished yet. The IC9100 on the booth was not RF operational (maybe reason why no mic was connected on it). It still has a nice look, and it would be a great rig to have in the future shack. My thanks to Alan, GM1SXX for making the picture gallery 73 de JA/PE1RAH, William Leijenaar in Tokyo. --- ___ Sent via amsat...@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
[amsat-bb] My visit to Ham Fair Tokyo and joining JAMSAT booth
Hello (J)AMSATs, Today was the last day of Tokyo Ham Fair, which was another great day like it was yesterday. I was at the JAMSAT booth where I showed my small transponder design to the HAM people, which gave a lot off interest from all kinds of people. Possibilities for future satellite have been created and people have been made interrested in doing satellite communication. I had also the opertunity to meet a lot of people using the VO-52 satellite, on which is my transponder. It is a great joy to see the satellite activities here on the other side of the globe (seen from my home in The Netherlands). I noticed that a lot of CW is used here. Some people are doing city junting, which means they have their car build like a satellite station (incl. rotor and elevation) and hop between satellite passes from one city to another, and try to make QSOs from as many cities as possible. The car stations are real nice contructions, and of great ham spirit. Very nice to see... There was also a list with number of contacts made for each satellite pass by one ham. The highest number was on VO-52 with 42 QSO's for one pass (over Japan), 36 in CW and 6 in SSB. Its really amazing, and it must have been done with very high time efficiency, and a very fast CW wrist hihi... It was a great time at the JAMSAT booth, and we had a nice after party with lot of JAMSAT members, and with delicious Japanese food. My thanks for the great hospitality from the JAMSAT people, and thanks for the nice talks we had about satellites. 73 de JA/PE1RAH William Leijenaar in Tokyo (till 28 August) --- ___ Sent via amsat...@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
[amsat-bb] Cubesat Linear Transponder at Tokyo Ham Fair
Hi AMSATs, Last weeks I have been working on a testboard for the very small linear transponder system that I have designed. I plan to be at the JARL Ham Fair in Tokyo, Japan on 22nd and 23rd August, where I will present my thiny linear transponder to the ham people. I will be in Japan from 15th August till 27th of August. When some University Cubesat group in Japan is interrested in my transponder design I can give demonstration and presentation. Only serious parties please. Please see some older movies about my transponder design on youtube: http://www.youtube.com/user/pe1rah 73, and maybe see you on Ham Fair Tokyo, William Leijenaar, PE1RAH --- _ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ ___ Sent via amsat...@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
[amsat-bb] Re: VU2MKP Silent Key
Hello AMSATs, I just wanted to write some message on AMSAT-BB, and then I read the sad message about silent key of Robert VU2MKP. It is a great lost for the HAM world. I made several contacts with Robert via the old bird AO-10, which was a great joy. Later when I was in Bangalore, India, I got the chance to meet him in person. I was very amazed to see how he uses his radios, and laptop computer with a small stick in his mouth. He did have lots of positive energy, even when he lost lots of his body functions. A great man and ham with real ham spirit. My condolences to his family, May his soul rest in peace, William Leijenaar PE1RAH --- ___ Sent via amsat...@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
[amsat-bb] Anyone has demo version of Cubesat structure ?
Hi AMSATs, I am looking for some Cubesat structure that I can use for demonstration of my Ultra Small Lineat Transponder design. It should not be an expensive flight-model version. Its only for showing the idea how my transponder can be mount into a cubesat body. I can try to make some structure myself, but that takes lots of work and I need to get the precize sizes somehow. Maybe someone has ever made a Cubesat demo version ? My kind regards, William Leijenaar PE1RAH --- ___ Sent via amsat...@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
