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www.southgatearc.org
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New videos of a Cubesat linear transponderWilliam Leijenaar, PE1RAH, has posted videos of his new Cubesat 435/145 MHz linear transponder on YouTube William PE1RAH was responsible for one of the 435/145 transponders used on the Amateur Satellite VUSAT (VO-52) and last year he developed a 300mW PEP linear CW/SSB transponder that would run from a 3.6 volt battery and was small enough to fit into a Cubesat . In a posting to the AMSAT Bulletin Board (AMSAT-BB) he writes: Everything has been prepared for the Ham Fair in Tokyo, so I got some time to make some new video demonstrations of my tiny transponder. On the AMSAT-BB I see some interresting articles about launch options, will see what the future brings. I am looking for something smaller than 1U cubesat, I wonder if that can be done. In the following video I show my transponder design in a CubeSat model that I made from transparent plastic glass. The transponder only takes a small amount of volume, and might fit in most CubeSat experiment satellites. Another option is to put one in a half CubeSat-structure. I don't know if there are also quarter Cube structures ?? Maybe it can reduce costs. Or have 4 in space for the price of 1U Cube... Because the transponder and its connections are very small I made a Demoboard for easy testing and using. In my second video I give a demonstration of this Demoboard, on which the transponder can be placed and connected. The Demoboard has an onboard 3.7V regulator which allows input voltages from 5V up to 15Vdc, which can be done in the way of a small supply adapter. The RF connections are all SMA, for easy testing and use. In case of terresterial use where weight is no problem (E.g on top of mountain) the Demoboard can be used as well. On the SMA 2m output a linear power amplifier can be connected to boost up the RF power. The 200mW output of the transponder is enough to drive e.g the 2m all mode Mitsubishi M57713 power module, giving you almost 20W RF power. The Demoboard I will demonstrate at the Ham Fair in Tokyo. Enjoy ham radio, Hope to meet you at the Ham Fair in Tokyo,
73 de PE1RAH, William Leijenaar
PE1RAH website: http://www.qsl.net/pe1rah/ CubeSat-sized linear transponder developed AMSAT Bulletin Board AMSAT-BB
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