ARLA/CLUSTER: Interferencia de FM no segmento RESERVADO ao Serviço de Amador por Satelite desde Espanha ou Portugal.

[João Gonçalves Costa]

FM interference to Linear Transponder Satellites

To an FM operator, 145.8-146.0 MHz may seem to be empty, it is not! These frequencies are used by weak signal SSB/CW satellite transponders and even a few watts of FM can cause severe interference.

Some FM operators are unaware that if they use these frequencies their local chat across town will be heard thousands of km away and, in doing so, will block the satellite.

Alexandru Csete OZ9AEC made this recording on Saturday, May 5, 2012 using the AMSAT-UK FUNcube Dongle and Gqrx SDR. It shows very strong FM transmissions on the FO-29 linear transponder which could be from Spain or Portugal. The topic appears to be chocolate. Alexandru says - If you know who these people are, be sure to send them a QSL card!

The use of FM on an SSB/CW linear transponder satellite reduces the lifetime of both the batteries and the transponder itself.

Watch FM Interference on FO-29 amateur radio satellite
http://www.youtube.com/embed/X1hIfKSIyOI?rel=0

Alex OZ9AEC has previously reported interference on the HO-68 linear transponder, see
http://www.oz9aec.net/index.php/communications/401-interference-on-ho68-linear-transponder

How to work the SSB amateur radio satellites
http://www.uk.amsat.org/2712

AMSAT-UK FUNcube Yahoo Group
http://groups.yahoo.com/group/FUNcube




-------------- próxima parte ----------
Um anexo em HTML foi limpo...
URL: http://radio-amador.net/pipermail/cluster/attachments/20120509/6b0e0452/attachment.html