For reception SV4CG made a converter using the long persistence P7 c.r.t. With this set-up Costas had his first SSTV contact on 40 metres with SV1AB on February 28th 1971. After that he had many contacts on 7 and 14 MHz as can be seen from the extract from his log. (The special commemorative prefix of SZ0 was used by all SV stations during 1971). 6. Costas Georgiou SV1OE. (E.M.E.) Up to the end of 1988 the only Greek amateur who had positively authenticated Moonbounce contacts was Costas Georgiou SV1OE. His very first contact was made in 1982 when he contacted VE7BQH in Canada on 2 metres. In the ensuing four years Costas managed to work four more stations: K1WHS, SM4GVF, W5UN and KB8RQ. In 1982 Costas had been trying for three years, without success, to hear his own signal via Moonbounce. The reason for his failure was that he was unaware of a very basic fact. "I was completely ignorant of the Doppler shift effect," Costas told me. "The frequency of received signals varies according to the position of the moon. If it is to the East of your own location the signals return 500 to 1,000 Hz below the original transmitted frequency. For years I had been sending long dashes slowly and waiting to hear my signals return on the same spot, which they never did. This happens for one instant only, when the Moon is at 180 degrees azimuth, exactly due south. When it moves to the west of south the returning frequency is correspondingly higher. Using a 50Hz audio filter (which is essential for Moonbounce) it is very easy to miss the weak signals. Soon after I found out my ridiculous mistake I began to hear my signals, naturally with a delay of one or two seconds because of the enormous distance involved--770,000 kilometres, 385,000 there and 385,000 back. Costas continued: "My next problem was finding the moon. I had no computer at the time and no Keplerian elements. I mounted a small video camera in the centre of four 16-element Yagi antennas and rotated the elevation and azimuth motors until I could see the moon in the centre of the monitor in the shack. Of course when the sky was overcast I was out of business. Much later when I obtained a little Sinclair ZX80 computer life became easier. "When I made my first contact I was simultaneously in QSO with SV1AB and SV1IO on 1,296 MHz who could hear what was going on. I remember SV1AB got very excited and began shouting 'I can hear him, I can hear him!' The QSO was with VE7BQH. Later Lionel sent me a very valuable present, valuable not for its cost but for the fact that it was something quite unobtainable in Greece at that time--a very low-noise preamplifier for 2 metres.