Op 28-07-13 16:59, Tanan Rangseeprom HS1JAN schreef:
Dear Sir;
My name Mr.Tanan Rangseeprom my callsign HS1JAN. I need help and advice from
you for circuit diagram of V/U Liner transponder .I and team want to build it
for payload of JAISAT-1 amateur radio satellites of Thailand. JAISAT means is
HEART in thai language. JAISAT is Joint Academies Intelligent Satellites for
Amateur Radio of Thailand. this is project research and developmentean consists
of RAST and Amateur Radio University inThailand both instructor and students.
JAISAT-1 have payload liner transponder V/U uplink at 145.800 - 145.90 MHz and
Downlink at 435.10 - 435.20 MHz on CW/SSB to fit in CUBESAT design. but this
time I and technical team have no knowledge of the circuit diagram of liner
transponder V/U. So you can help and advice me for Electronic Circuit Diagram
of liner transponder V/U.
Best Regards
Tanan Rangseeprom HS1JAN / XU7ADN
Project Manager of JAISAT-1
member of RAST
email : [email protected]
You could contact William PE1RAH
http://www.leijenaarelectronics.nl/index.html for advice or or prebuild
transponders.
I would advice against V/U but rather go for U/V for several reasons,
1st is grondstation desensing, if you transmit on 435 and recive on 145
you won't have to deal with harmonics, 2nd is pirates in 145.800 to 146
mhz, you are less likely to pick up illigal taxi transmitters and
cordless phones on 435 mhz.
Lots of luck on the designs and flying of your sat
73 Andre PE1RDW
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