|
|
|
www.southgatearc.org
|
Improved, ultra-small, linear transponder - videoWilliam PE1RAH developed one of the transponders used on the amateur satellite HamSat (VO-52). Now he has developed a linear 435 to 145 MHz linear transponder which could be used on CubeSats and has made available on YouTube a video about it. CubeSats are tiny satellites, a cube of just 10*10*10 cm. The CubeSats launched so far have only been able to carry simple FM based single channel systems so Williams work in developing an ultra small linear transponder which could carry up to simultaneous 8 CW/SSB contacts is a major step forward. On the AMSAT Bulletin Board (AMSAT-BB) he writes: I put some new video on youtube about my tiny linear transponder. Its a slighty improved version, with better distortion behaviour and some extra features, like a low voltage switch off circuit. Some general details: Its a Mode-UV [435-145] transponder with 23dBm PEP output on 2m. It runs on 3.7Vdc, power switches off when voltage drops below 3.5Vdc. Bandwidth is 30kHz, and total weight is around 22 grams. It has an onboard beacon that is fully programmable (message, frequency and power). The RX and TX frequencies of the transponder are user programmable, and all oscillators are locked to an onboard TCXO. This improved version has also the option for an external reference oscillator input, and has a tap at 70cm input and a tap on its 1st IF. The taps are very useful to interconnect to other transponders or connection to external telemetry modems. The video can be seen here. More information will follow... 73 de PE1RAH
PE1RAH website AMSAT Bulletin Board AMSAT-BB
|
|
|||||||||||||||||
|
|
|
