英國布里斯托大學 學生發送氣球，將近繞地球一圈

以下為原文
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UK Student Balloon Crosses Pacific

On Thursday, March 17 the UBSEDS14 balloon, launched by University of
Bristol
students, had successfully crossed the Pacific and was above Arizona, having
traveled over 24,500 km since launch.  By March 19 the balloon had
crossed the
United States and was headed out across the Atlantic Ocean.

The University of Bristol Students for the Exploration and Development
of Space
(UBSEDS) launched their balloon on Monday, March 8. Powered by a single AA
Lithium Energiser Battery (LR91) the balloon has been transmitting about
5dBm of
Contestia 16/1000 on 434.600 MHz USB at 4 minute intervals as well as APRS
during its flight at an altitude of about 11,000m.

The balloon uses the error-correcting Contestia 16/1000 mode on 434.6MHz
USB.

The transmission power on this band was measured to be +5dBm on a
similar board,
which is well below the +10dBm limit for ISM band operation. Each packet was
preceded by 10 seconds of 1Hz pips for manual alignment and a RSID tone for
automatic alignment with suitable software (dl-fldigi for example). For many
countries the balloon transmits APRS packets on local frequencies. In
particular
this is 144.8MHz in Europe, 144.66MHz in Japan and 144.39MHz in North
America.

The balloon has a diameter of 1.5m and the payload weighs just 21.3 grams.
Despite the weight constraints the team have managed to employ sophisticated
Geofencing technology to prevent the balloon transmitting when over certain
countries and also to select different APRS frequencies depending on the
territory being overflown.

UBSEDS14 information is available at
http://www.bristol-seds.co.uk/hab/flight/2016/03/07/ubseds14.html

UBSEDS14 balloon launch
http://www.southgatearc.org/news/2016/march/ubseds14_balloon_launches_today.htm

One of the students involved in the project is Richard Meadows M0SBU. He
took
the amateur radio courses run by the Chelmsford Amateur Radio Society
(CARS) at
Danbury in Essex. Further information on the courses is available from
the CARS
Training Manager
Email: training2016 at g0mwt.org.uk
Web: http://g0mwt.org.uk/training

[ANS thanks AMSAT-UK for the above information]


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