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What to use for an underground transponder?
Lower frequencies mean longer antenna. :-( Typo/Brain-fart -- I meant "higher" frequency I think you need to do some more research. Its easier not to re-invent the wheel. I certainly do not wish to reinvent the wheel, but, I would like to carve and sand my own wheel, though -- for commercial reasons. I'm looking for the most lowest level of development that one could start with given a humble work environment. -- //Clint Alexander "Baron" wrote in message ... Clint Alexander Inscribed thus: Consider just how big the antenna might have to be at those frequencies. 300,000,000 divided by F in Hz = length in meters. Using your 5Khz (300,000,000/5000) = 60,000 meters ! That's true. Okay -- I obviously would need a lower frequency Lower frequencies mean longer antenna. :-( Also since 5Khz is in the audio range of frequencies you might be better off with a coil based microphone. to penetrate ground; what would be a workable solution? I think you need to do some more research. Its easier not to re-invent the wheel. What if I took 10ft of antennae and just coiled it so it didn't take up so much space? If you take any antenna and reduce its physical size you will also reduce the amount of energy that it can radiate for any given input. I forget the rule of thumb, but it goes something like inverse square. Half the radiation quarter of the distance. Thanks for all the info! -- Best Regards: Baron. |
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