ほとんど話題に上らないドイツ衛星 BeeSat について、DK3WN, Mike Rupprecht 氏
が amsat-bb に記事を投稿していたので、ここに紹介します。現在、ベルリン上空
でのみ、管制局の指示によってアクティブになっているということです。
Subject: [amsat-bb] Re: BEESAT
From: Mike Rupprecht, DK3WN
Date: Mon, 23 Aug 2010 15:30:39 +0200
BeeSat has two CMX909B modems (CML) onboard. The data formats is MOBITEX,
not AX.25 !
The CMX909B is a half-duplex Gaussian Minimum Shift Keyed (GMSK) BT = 0.3
modem data pump with on-chip packet data handling. GMSK modulation optimizes
the data throughput for a given bandwidth RF channel and the on-chip packet
data handling relieves the host uC of regular processing tasks, such as
maintaining Bit and Frame Synch, Block Formatting, CRC and FEC Error Processing,
Data Interleaving and Scrambling.
BEESat is only active on request of the ground station in Berlin.
There is no CW beacon.