<div dir="ltr"><h1>OSCAR 7 and 73 – The old and the new</h1><p> A very good set of co-incident passes of both the <strong>AO-7</strong> and<strong> FUNcube-1 AO-73</strong> amateur radio satellites occurred over the UK on the morning of Thursday, April 3 <br>
<br> The two satellites were launched 39 years apart, AO-7 on November 15, 1974 and FUNcube-1 AO-73 on November 21, 2013.<br><br> 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.</p>
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<td> <div align="center"><font color="#999999" size="1">SUWS WebSDR showing AO7 and 73</font></div></td></tr></tbody></table><p> New Helical antennas designed by <strong>Martin Ehrenfried, G8JNJ</strong>, the installation of pre-amplifiers by <strong>Noel Matthews, G8GTZ</strong>, and a new PC build by <strong>Phil Crump, M0DNY</strong> have helped to dramatically improve the overall performance, especially on the 2m and 70cm Amateur bands.<br>
<br> 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.<br>
<br> 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.<br><br> 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.<br>
<br> SUWS WebSDR <a href="http://websdr.suws.org.uk/" target="_blank">http://websdr.suws.org.uk/</a><br><br> AMSAT-UK <a href="http://amsat-uk.org/" target="_blank">http://amsat-uk.org/</a></p>
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