Re: SETI


David Woolley (david@djwhome.demon.co.uk)
Thu, 24 Jun 1999 08:14:09 +0100 (BST)


> First, I was wondering, could a loop of wire be fed directly into a LNA Yes. > so I wouldn't have to buy an expensive receiver? Second if that would No. I don't know if it is still in print, or available from libraries, but you should try and obtain a copy of Foundations of Wireless and Electronics, by M G Scroggie, to get a better understanding of what is inside the box of a receiver. You should probably also get the ARRL's book on transistor circuits for radio amateurs, which describes issues like noise and intemodulation products, but you may find it too heavy reading. > work, how big should the loop be for best reception at a given frequency? For a simple loop, quite small, because you won't gain much by making it bigger - in any case why would you think a loop would be better than a dipole; the fashion for loops in amateur radio is on the short waves, where it is not always possible to construct a resonant dipole. Such loops are very frequency sensitive, whereas a desirable characteristic for a SETI antenna is a lack of freqency sensitivity. I don't know if Dr Cohen has closed loop versions of his fractal designs, which could fill an area. > Third could two dishes pointed at different areas in the sky be used and > sent to the computer where anything they have in common gets eliminated > from the signal analysis and the computer just analyze the remaining > signals of both dishes individually? It would be expensive compared with moving the one dish "off axis".



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