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#2
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In article ,
"William W. Plummer" wrote: Could it be an old OMEGA system. That was decommissioned only about 5 years ago. As I understand it, this was the original radio navigation system for airplanes know as "Highways in the Skies". It was low frequency. The pilot would listen to the selected frequency and hear a steady tone if he was right on the highway, or di-dah ("A") if on one side or dah-dit ("N") on the other. I think you're talking about the old 4-course airways. OMEGA was a hyperbolic radio navigation system (in some ways similar to LORAN). It was used by both aircraft and ships for trans-oceanic navigation, with a fix accuracy of about 4 nm (you can do better with a sextant). There were only 8 transmitters in the world (and the one in the US is still in use for other purposes), so it seems unlikely that much surplus equipment would be available. Transmission was in the 10 kHz band. http://webhome.idirect.com/~jproc/hyperbolic/omega.html |
#3
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OK, Roy. Here's another far out guess.
Back in the late '40s I remember chiropractors using a "diathermy" machine. I believe this would use RF energy to induce heat in the patient's muscles. We got a TV set in 1948 and started getting lots of interference which was subsequently traced to the diathermy machine in town about 1 half mile away. I never saw it, but I understand it was impressive and would have been admired by Frankenstein. http://www.medtronic.com/activa/phys...my_safety.html |
#4
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![]() "Roy Smith" wrote in message ... In article , "William W. Plummer" wrote: ... That was decommissioned only about 5 years ago. As I understand it, this was the original radio navigation system for airplanes know as "Highways in the Skies". It was low frequency. The pilot would listen to the selected frequency and hear a steady tone if he was right on the highway, or di-dah ("A") if on one side or dah-dit ("N") on the other. I think you're talking about the old 4-course airways. ... http://www.airwaysmuseum.com/Lorenz%20SYR%2044.htm .... technically "4-course radio range"...and they were decommissioned as soon as VORs and ADF receivers became prevalent. In Canada that was the early-to-mid 1960's, with the possible exception of some isolated relic. Anything is possible, but I don't think the OP picture is one of those. Interesting to note, that even then (and how accurately could a course have been followed???).... even then pilots were encouraged to fly right-of-course to avoid meeting someone else "on course": http://www.navfltsm.addr.com/ndb-nav-history.htm |
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