Chubusat Message Exchange Service?
All:
Does anyone know the details on how Chubusat's Message Exchange Service works?
It appears the satellite will receive messages on the 1200 baud VHF uplink while the 9600 baud UHF down link will be used to send (possibly broadcast) said messages. According to the website, ground stations need to "send an inquiry message" to read messages.
That said, if this is a full-duplex system, one would obviously need a pair of modems to run both 1200 and 9600 baud i.e., something like a pair of UZ7HO sound modems.
Any thoughts?
Tony -K2MO
Message Exchange Service Information ChubuSat-3 provides the message exchange service. After the on-orbit checkout of the satellite (about one month after the launch), you can use the service, sending your message with amateur VHF (145.84MHz FSK 1200bps) then your message is written to the on-board memory. Anyone can read your message with amateur UHF (437.425MHz GMSK 9600bps) by sending inquiry message. The uplink/downlink format is available here.
<URL>
https://www.frontier.phys.nagoya-u.ac.jp/chubusat/Amateur_MSG_REPLY_format.p df
Mark Lunday, WD4ELG Greensboro, NC FM06be wd4elg@arrl.net http://wd4elg.blogspot.com
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Tony