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What to use for an underground transponder?
The relationship is so close, I would suggest that the Sonde is a perfect
application for my needs. Like I said previously, I want to build my own version. So we'll assume this as the target technology leaving me with the question of what antenna would be needed to perform these operations. I suppose the oscillator is just a simple crystal or perhaps even voltage controlled (adjustable). I can use a 555 for this.... -- //Clint Alexander "UKMonitor" wrote in message ... On Jun 3, 12:53 am, "Clint Alexander" wrote: For all involved in the thread -- here's a perfect example. Sondes are locator systems used in many areas (I think) such as pipelines:http://www.rjmcompany.com/Pipe-cable...0-SuperCAT.htm These have frequencies of 512hz, 8Khz and 33Khz I'm searching for any specs now regarding crystal and antenna for both transmitter and receiver. But I'm certain that the antenna isn't 1000's of meters long If I'm reading this right -- I would want to build my own version of the technology rather than purchase theirs'. -- //Clint Alexander "Clint Alexander" wrote in message news 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. I'm not sure of the signaling to use therefore I'm not sure of the antenna required. But, it would need it to follow part 15 of the FCC rules/regulations (none hazardous and allows required interference). I am completely new at this sort of technology. I have created circuits before using L555 timer, 4046Phase Loop, etc. But I've never went farther than building simple demonstration circuits. I wondered if there was anyone on this list that may be able to shed some light on what I would need and/or how I would use them (a schematical description), or even point me to the "yellow brick road". Thanks! -- //Clint Alexander- Hide quoted text - - Show quoted text - I think we need to know a bit more about your application. I have one of these pipe / cable locators, you need to have a good idea of the route the pipework its taking and then 'sweep' the approximate area with the end of the locator. If you don't have a starting point it's very time consuming to cover a large area. The avalanche beacon permits initial detection over a much wider area which considerably speeds up a 'blind' search. What size transmitter (physical) are you able to use, Max weight, Battery duration, required detection radius, depth of burial etc. UKM |
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