🚀 go-pugleaf

A few weeks back I posted an article regarding the best type of Elec-Mag Rad
to use for measuring the distance to an moving object.  I wanted to be able
to use triangulation to figure out the exact 3D location of the transmiter.

After review of all your responses I have determined that the most effective
(and cheapest) way to produce these results is to use ultrasonics.  So, my
new questions are these:

	1)  Where can I purchase a relatively cheap and accurate ultrasonic
	    transmitter/reciever set? (Phone #, Addresses)

	2)  Can I get a Receiver(1) to receive more than one frequency at
	    once?  Say for example:
							)--TRANS #1
							)--TRANS #2
			RECV --(		        )--TRANS #3
							)--TRANS #4
							)--TRANS #5
							)--TRANS #6

	   Where each transmitter (1-6) is on it own frequency.

	3)  If I cannot receive these signals simutaneously, then can I
	    receive them in a sequence of say .25 second as such:

	
	SIGNAL			RECEIVED (HIGH)
	------		----------------------------------

	  1		__||______________________________
	  2		_____||___________________________
	  3		________||________________________
	  4		___________||_____________________
   	  5		______________||__________________
 	  6		_________________||_______________


Thanks in Advance!!!!!!

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