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Post by murph on May 16, 2006 16:37:22 GMT -5
???Ive been looking into building a ULF transmitter/receiver or CAVE RADIO but can not any one who has don it i read a spotlight in the nss news and someone had used one to help locate a second entrance / through trip Ive seance moved and cannot find that issue .does anyone know where i could get some wiring diagrams or have a contact that might be helpful??? thanks Donald murphynss48087
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Post by Sharon Faulkner on May 16, 2006 16:49:17 GMT -5
Hi Donald and welcome to the forum  Check with Doug Strait (should be in the Members Manual under Georgia). He helped locate a second entrance to Sewanee Plunge Cave using some such electronic system three or four years ago. |
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L Roebuck
Technical Support
Caving
^V^ Just a caver
Posts: 2,023
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Post by L Roebuck on May 16, 2006 16:49:51 GMT -5
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NZcaver
Beginner
U.S. Caver
Posts: 140
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Post by NZcaver on May 16, 2006 20:54:35 GMT -5
Brian Pease in Connecticut is probably the most prominant/active person in the US when it comes to developing cave radio direction finding equipment. He has a website at radiolocation.tripod.com/ which includes various designs (beware of pop-up windows).  |
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L Roebuck
Technical Support
Caving
^V^ Just a caver
Posts: 2,023
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Post by L Roebuck on Nov 10, 2006 9:08:57 GMT -5
Perhaps this was the beginning steps to underground communications?
In 1963, He Crafted an Audio Lifeline Engineer Used an RCA Mic, Extension Cords and Ingenuity to Help Save Trapped Coal Miners by James Careless For two weeks in August 1963, the world listened as rescuers tried to free three coal miners trapped 300 feet underground in Sheppton , Pa. Two of the miners would be saved after a two-week underground ordeal; a third was never found. What most listeners didn’t know, and few people now recall, is that the audio lifeline that detected the miners was created by 19-year-old radio engineer Phil Margush, who crafted it out of spliced extension cords, an RCA “salt shaker” microphone and a Voice of Music 7-inch reel-to-reel tape recorder used as a monitor. Full Story and Photo's |
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