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CX2SA > SAT 24.04.05 18:47l 48 Lines 1904 Bytes #999 (0) @ AMSAT
BID : ANS-114.03
Read: GUEST
Subj: FM OPS on Linear Transponder
Path: DB0FHN<DB0RGB<DB0AAB<DB0PV<DB0MRW<DB0WUE<DK0WUE<7M3TJZ<EA5AKC<CX2SA
Sent: 050424/1639Z @:CX2SA.LAV.URY.SA #:40551 [Minas] FBB7.00e $:ANS-114.03
From: CX2SA@CX2SA.LAV.URY.SA
To : SAT@AMSAT
AMSAT News Service Bulletin 114.03
From AMSAT HQ SILVER SPRING, MD.
April 24, 2005
To All RADIO AMATEURS
BID: $ANS-114.03
FM operation on a linear transponder not good practice
The possibility of FM operation through the linear transponders on board
the soon-to-be-launched VUSAT was announced recently by AMSAT-India. The
Advisory Panel to the IARU Satellite Advisor, Hans van de Groenendaal,
ZS6AKV, considered this during its regular Echolink consultative meeting
last weekend. The group pointed out that FM is an inefficient use of
spectrum and power and recommended strongly that FM should not be used
on linear transponders. In many countries with large amateur
communities, FM on a linear transponder is a totally unacceptable mode
of operation and discouraged at all times.
The IARU Satellite Advisor and the Panel have suggested to AMSAT India
not to publish FM as a user option for the linear transponder, and to
discourage the use of FM through these transponders, especially in
countries with large amateur populations.
The IARU Satellite Advisor and his panel meet on Echolink on a regular
basis to review requests for frequency coordination. The main objective
is to advise satellite builders on spectrum use in order to achieve
harmonious use of the limited spectrum and to avoid or minimize
interference.
“We have carefully chosen our meeting time to enable team members in the
US, Europe and Australia to talk to each other at a reasonable time of
the dayö, ZS6AKV said. It is quite a challenge, when it is midday in the
USA it is late evening in Europe and Africa and very early the next
morning in Australia.
Over the past few years the team has developed a number of guideline
papers for satellite builders and operators. For more information visit
www.iaru.org/satellite
[ANS thanks Hans, ZS6AKV for the above information]
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