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Our astronmer friend is cleaning house in preperation to moving
to NZ. She loaned me a couple of older books. "The Handbook of Solar Flare Monitoring and propagation forcasting" , by Carl M Cherman is fascinating. One antenna is too interesting to ignore. The MLA-2/B loop anenna is deigned to be used from 3~25MHz for both RX and TX operations. It is based on "an impedence transfomer from a 50 Ohm transmission line to the nominal 377 ohm resistance of free space." The publishd pattern is very interesting. A quick net search didn't bring anything up. It was made by Antenna Research Associates of Beltsville MD. I have visited their web site and sent a Email. I was just wondering if anyone in the group had run into this odd antenna. It is reported to have "the performance of a half wave antenna with a device no larger then 54 inches". If accurate this could be a usefull antenna. Another oldie but goodie is J.A. Ratcliff's "Sun Earth and Radio". The Copyright date is 1970 but the information is still of interest to anyone who uses HF radio. I had heard of this book and tried to locate one for a longtime. Terry |
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