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![]() "Bart Bailey" wrote in message ... In Message-ID:lkQdg.27874$QP4.7530@fed1read12 posted on Fri, 26 May 2006 21:12:01 -0700, Sal M. Onella wrote: The training aids for the EMI Awareness course I used to teach at San Diego Naval Station (command = FTSCPAC, if you know that outfit) included a funky little plywood ship, within which were two milliwatt-level HF "transmitters" and a receiver. Was that what was called the model pond, has a chocolate chip looking tower arcing out over it, very unusual sight from the road? I had a friend Charles Roy WS6F (now SK) that used to work there. No, but I know what you're talking about. (The demo I did for class was a desktop affair -- kept in a suitcase between classes) You're probably referring to the model range(s) at Naval Ocean Systems Center (NOSC) on Point Loma. NOSC was consolidated, I think, into Space and Naval Warfare Systems Center, San Diego. For those not familiar with this process, they used brass ship models, both existing and proposed, built to 1/48 scale. They were on a lead (Pb) "sea" at least 100 feet across. At the center of the "sea" was a turntable, on which the model could present any aspect to the tower you refer to. The tower supported a log periodic antenna which could be raised along a curved arc from the horizon up to the zenith, overhead the model. Picture about halfway down the page at http://www.spawar.navy.mil/sti/publi...d/1940/photos/ The model ship was fitted with scale antennas, complete with coax that ran down through the turntable and into the control room. For any given antenna and location on the model, the engineers could get a three-dimension Antenna Radiation Pattern at scale for a good idea of how it would work in the real world. ... and I understand it was quite reliable. 96 MHz scale was 2 MHz real-world, and so on. I think the LPA did all the transmitting, but I'm not positive. I got a guided tour of the range once in the 1980's when I was in their building for an unrelated conference. (It was more interesting than parts of the conference, but that's another story.) I wonder, do they still model antennas this way? A few of the brass models were regularly on display, visible from the road about ten feet behind the fence, for many years. It has been five years since I did any work on Point Loma and I don't know if any models are still in public view. 73, John |
#2
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![]() "Sal M. Onella" wrote in message news:F5aeg.27941$QP4.12044@fed1read12... "Bart Bailey" wrote in message ... In Message-ID:lkQdg.27874$QP4.7530@fed1read12 posted on Fri, 26 May 2006 21:12:01 -0700, Sal M. Onella wrote: ... they used brass ship models, Ahhh! the days before Roy and his "modeling software" when we used "modeling hardware" (:-) When ships were made of wood and men were made of steel. [[you could tell by the 'rust' stains on their skivvies]] sorry, still a little old salt left in the veins... It's amazing what you can do when money is no object... 73, Steve, K9DCI |
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