ARLA/CLUSTER: Do Oscar 7 ao Oscar 73 - O antigo e o novo

[João Costa > CT1FBF]

OSCAR 7 and 73 – The old and the new

A very good set of co-incident passes of both the *AO-7* and* FUNcube-1
AO-73* amateur radio satellites occurred over the UK on the morning of
Thursday, April 3

The two satellites were launched 39 years apart, AO-7 on November 15, 1974
and FUNcube-1 AO-73 on November 21, 2013.

Simultaneous downlinks from both satellites could be clearly seen and heard
on 2m, via the Southampton University Wireless Society (SUWS) WebSDR which
covers the 144, 432, 1290 and 10368 MHz bands and is available for use
world-wide.
SUWS WebSDR showing AO7 and 73

New Helical antennas designed by *Martin Ehrenfried, G8JNJ*, the
installation of pre-amplifiers by *Noel Matthews, G8GTZ*, and a new PC
build by *Phil Crump, M0DNY* have helped to dramatically improve the
overall performance, especially on the 2m and 70cm Amateur bands.

The FUNcube-1 AO-73 BPSK telemetry beacon on 145.935 MHz is now up to 20dB
above the receiver noise floor, and several stations using SSB, including
Martin, G8JNJ, could be clearly heard on the 2m downlink via the SDR during
last weekends transponder tests.

More improvements are in the pipeline, which the team hope will help to
further improve the receive sensitivity and reduce the level of interfering
signals that can be observed on 2m.

Anybody can operate the SUWS WebSDR to receive signals from Satellites, and
the team really appreciate users leaving a message in the chatbox to let
them know what has been heard.

SUWS WebSDR http://websdr.suws.org.uk/

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