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- Path: sparky!uunet!wupost!usc!sol.ctr.columbia.edu!ucselx!newshub.sdsu.edu!larc.sdsu.edu!user
- From: babb@sciences.sdsu.edu (J. Babb)
- Newsgroups: sci.electronics
- Subject: Re: Ultrasonic Trans/Recv
- Followup-To: sci.electronics
- Date: 6 Jan 1993 00:45:44 GMT
- Organization: SDSU - LARC
- Lines: 28
- Distribution: world
- Message-ID: <babb-050193163733@larc.sdsu.edu>
- References: <1icacgINNn10@uwm.edu>
- NNTP-Posting-Host: larc.sdsu.edu
-
- In article <1icacgINNn10@uwm.edu>, albrecht@csd4.csd.uwm.edu wrote:
- > 1) Where can I purchase a relatively cheap and accurate ultrasonic
- > transmitter/reciever set? (Phone #, Addresses)
-
- I don't know about a set but National Semi used to make an ultrasonic
- ranging chip set: Xmtr & Rcvr in same package LM 1812 I believe. Was
- outlined in their Linear databook a few years back.
-
- > 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?
- Freq was dependent on resonant freq of transducer, 40 Khz for atmospheric
- type, 200 Khz for hydrophone type (used for 'spinning neon bulb' type fish
- detector).
-
- > 3) If I cannot receive these signals simutaneously, then can I
- > receive them in a sequence of say .25 second as such:
-
- I believe there was a trigger or gating circuit of some type.
-
- Jeff.
-