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#3
June 1st 10, 05:22 PM
posted to rec.radio.amateur.antenna
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What to use for an underground transponder?
On Jun 1, 4:44*pm, "Geoffrey S. Mendelson"
wrote: Clint Alexander wrote: I want to make a simple transmitter to use as a locator beacon. But the source would be in the ground (anywhere between 3 - 10ft). The receiver would need to locate it, much like a metal detector would except it would be a small hand-held "wand" with a LCD giving the direction and signal strength. Try burying a WiFi dongle and see what you get. 2.4gHz has the advantages of being COTS (commercial off the shelf technology), easy to build directional antennas, cheap and easily adapated to digital technology. It also has the advantage of being legal in almost (if not) every country in the world. I'm not sure it will reach through 3-10 feet of dirt, but I expect that anything much above 15khz will have that problem. Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel *N3OWJ/4X1GM New word I coined 12/13/09, "Sub-Wikipedia" adj, describing knowledge or understanding, as in he has a sub-wikipedia understanding of the situation. |
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