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TMSAT-1 Update

> TMSAT-1 commissioning has largely been completed and the satellite is in
> good shape.  We are presently concentrating on testing and calibration of
> the multispectral imaging system, and a number of very good image sets
> have been downloaded.  These image sets are approximagely 3.3MB and are
> therefore taking some time to download at 9k6 and some passes have
> therefore used the 38k4 downlink.
> Shortly after launch an amonaly was observed with the downlink transmitter
> that caused us to take a cautious attitude to operations.  The downlink
> power periodically drops from the nominal 1.8W down to approximately 0.9W
> with a corresponding increase in reverse voltage.  We are presently not
> certain as to the cause of this and tests are continuing to try to find
> the problem.  For this reason we are presently only operating the
> transmitter over the command stations in Bangkok, Thailand and Surrey,
> England, and this will probably continue for another few weeks.
> During this period I will endeavour to post good image sets to the web
> page -:
> http://www.ee.surrey.ac.uk/EE/CSER/UOSAT/amateur/tmsat/index.html
In the next day or so I will upload an image of the San Fransisco bay area
which was the first multispectral image downloaded.  The quality of this
image is comparable to LandSat!

> In a few weeks we expect to start to operate the transmitter for extended
> periods, and this will allow amateur operators in other locations to
> receive data from TMSAT.  At this time it is also expected that we will
> open the BBS for general use by amateurs.  This will allow any licensed
> amateur with the correct equipment to upload and download data from the
> satellite in a similar fashion to other digital satellites such as UO-22
> and KO-23.  Due to the large size and high quality of the images on TMSAT,
> it is hoped that the majority of activity on the satellite will
> concentrate on downloading of images, while general messaging and file
> transmission can remain on UO-22 and KO-23 etc.
> TMSAT downlink is on 436.925 and is presently transmitting at 9600 baud
> FSK.
Chris Jackson G7UPN / ZL2TPO


Chris Jackson
Groundstation and Operations Manager
Surrey Satellite Technology Ltd
University of Surrey
Guildford, Surrey GU2 5HX,  UK 
Ph: +44 1483 259-141
Fax: +44 1483 259-503
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