ARLA/CLUSTER: Tecnica para trabalhar satelites em SSB.

[João Costa > CT1FBF]

Working the SSB satellites

The linear transponder amateur radio satellites such as VO-52 are
great fun to work but the technique required is different to that used
for the FM satellites

Simon 2E0HTS has produced this video showing how to make contacts through VO-52.

Using a home-made 10 element 435 & IO Loop for 145MHz, with a Yaesu
FT-847, Simon – 2E0HTS, adjusts his (uplink) transmitted signal to
correct the Doppler of the received (downlink) frequency whilst
talking to fellow Ham operators around Europe. Thanks to the stations
worked via the VO-52 satellite which were SP9FPP, PD0HF & SP6DCO.

Video: http://youtu.be/8GM_zZd7aZE

Most linear satellites use what are known as ‘Inverting Transponders’
to reduce the Doppler shift. You transmit lower sideband (LSB) on the
uplink and it appears as upper sideband (USB) on the downlink.

When working through linear transponders use as little power as
possible, this will help extend the lifetime of the satellite
batteries. As a guide ensure your downlink signal is no stronger than
the satellite beacon.

The band plan for linear satellite downlinks is similar to what you’d
expect on the HF bands with CW operation in the lower part of the
downlink and SSB in the rest. Current satellite status can be seen at
http://oscar.dcarr.org/

John Heath G7HIA wrote about operating through VO-52 in his article
‘Getting started on amateur radio satellites’ which was published by
the Radio Society of Great Britain in the March 2007 edition of
RadCom. Download the article via
http://www.uk.amsat.org/2011/05/09/getting-started-on-amateur-radio-satellites/

David A Palmer, KB5WIA, has written an article “Twins! A
Backpack-Portable Full Duplex Satellite Station with Dual FT-817ND’s”
that can be seen at
http://kb5wia.blogspot.com/2010/10/satellite-portable-station.html

AMSAT-UK http://www.uk.amsat.org/