© Brooke Clarke 2015 - 2021

  Dukane SeaCom NA1 Underwater Acoustic Beacon
  Radatron Protector Model 8502 Ultrasonic Burglar Alarm
  Wire Bonder
   Piezo Disks
   Polaroid Sonar One Step Camera
   Audio Spotlight
    Marten Repeller


I think "Ultrasonic" dates back to 1923, prior to that such terms as "ultra-sonorous" (1917 patent 1471547) and "superaudible frequencies" (1943 patent 2420676) were also used so searching older literature for ultrasonic may not get the hits that are there under different names. 

Ultrasonic sound (Wiki: Ultrasound) has a frequency that's above human hearing.  Started this page after getting a couple of the Dukane SeaCom NA1 Underwater Accustic Beacons.
Bats (Wiki)use ultrasonic SONAR (Wiki) signals to locate very small insects while they are flying.


Dukane SeaCom NA1 Underwater Acoustic Beacon

This beacon (Fig 1)  is not the Underwater Locator Beacon (Wiki: ULB) used on aircraft Flight Data Recorders (Wiki) or Cockpit Voice Recorders (Wiki) since this NA1 unit does not have a water activated switch. i.e. the NA1 is on whenever the 9V battery is installed.  It is part of the Dukane N30A5B Underwater Beacon Locator (Fig 2) set that includes Receiver model N15A235B.

These are for divers to place to make something they want to return to without leaving a visible bouy at the surface.

These are powered by the common 9V battery.  The plastic bottom of the battery compartment has a tapered slot that gives the battery terminals access.  If the negative battery terminal is toward the wide end of the slot and the positive battery terminal toward the narrow end of the slot the battery will install properly and when pressed down you will feel the contact springs, but if installed in the reverse direction the battery will not go down enough to allow the cover to be installed and when pressed will not move.

I'm guessing this is a pulsed beacon, just like the ones used on the aircraft black boxes since that mode of operation greatly extendes the battery life.

I tried using the CSE Batdetector and heard nothing on both of my NA1 beacons.

Sonobuoys were developed during W.W.II to find enemy submarines.  One of the first, if not the first, U.S. sonobuoy is the CRT-1.  This was also used as the basis of the Project Mogul balloons, one of which crashed at Roswell NM.

Ultrasonic Cleaner

World Precision Instruments Inc. Model PUC-Y with Connoisseurs Delicate Jewelry Cleaner

Modes of operation are Off, medium Pulsed and High constant.

The jewelry cleaner has a basket inside the container, so you just put the jewelry in the basket and put water in the cleaner to couple the ultrasound to the cleaner.
Note:  If jewelry in put directly in the metal bowl it might destroy the stones because the jewelry would be hitting the metal bowl, so a few layers of cloth or a basket &Etc. is needed to seperate keep what's being cleaned from touching the metal.

Do not know what the two clamps held, didn't come with the cleaner.

World Precision
              Instruments Inc. Model PUC-Y with Connoisseurs Delicate
              Jewelry Cleaner

These are made in a number of sizes, larger ones for industrial cleaning applications and this one I have for cleaning jewlerey.

Radatron Protector Model 8502 Ultrasonic Burglar Alarm

I was hoping that this was a microwave Doppler unit, but it's ultrasonic.  As received both ultrasonic sensor cans were loose inside the unit.  They were supposed to be in holes in the wood front panel, so would not have worked.  I was able to get them back into the holes using a screwdriver prior to unfolding the top.  For more Radatron products see Radar Warning Receivers - Radatron.

Ultrasonic Gold Wire Bonder

When I was designing Radar Warning Receiver microwave modules where we built the circuit using raw diode chips (not in packages) some of the wire bonding machines used an ultrasonics to shake the bonding tip to put energy into the bond.  In order to fuse the pure gold wire with the pure gold mound on the diode top contact it takes a combination of energy (heat plus ultrasonic) and pressure to get the metal to fuse.

Piezo Disks

There was a magazine article about using a piezo disk to listen to the 32768 Hz oscillator in modern digital watches and thus be able to adjust the watch to be more accurate.

Tweeter Speakers

These have been suggested as a way to hear things like bats.

Polaroid Sonar One Step Camera

The range finder mechanism uses ultrasonic sound and so might be a way to get a sensitive ultrasonic microphone.

Holosonics Audio Spotlight

Wiki: Sound from ultrasoundSafe use: "Exposure to more intense ultrasound over 140 dB[citation needed] near the audible range (20–40 kHz) can lead to a syndrome involving manifestations of nausea, headache, tinnitus, pain, dizziness and fatigue...".  This sounds like Havana Syndrome (Wiki) to me. NYT comment 2021 May 13.

A narrow beam of ultrasonic sound at about 65 kHz is modulated with an audio signal.  Only people within the narrow beam can hear the audio. Used in stores where if you're standing in the right spot (marked with a decal on the floor) you hear the pitch, but nearby people do not hear anything.  Also used in magic acts where the "mind reader" is the only one in the beam.

4823908 Directional loudspeaker system, "A parametric loudspeaker utilizes nonlinearity of air relative to ultrasonic waves for producing an audio frequency having super directivity"
6778672 Audio reception control arrangement and method for a vehicle,
7391872 Parametric audio system, Frank Joseph Pompei, App: 1999-04-27, -
8027488 Parametric audio system,  F. Joseph Pompei, MIT, 2005-07-13 -
YouTube - Naval Post Graduate School -

Marten Repeller

eBay title: "12V Car Vehicle UltraSonic Under Hood Mice Rat Pest Repellent Mouse Repeller US", under $20 delivered.
Draws about 6 mA in standby.  At switch on audio tone and three blinks of the LED, then growling noise for a couple of seconds then nothing.

Using the CSE Bat detector  I can hear a sequence of very weak tones that sound reminiscent of electronic music.  These only happen every now and then, maybe once a minute or two.  During the tones the current is about 35 mA and when there are no tones the current is about 5 mA.  This seems more like playing music for rodents than something to scare them.


Fig 1 NA1 Underwater Accoustic Beacon
Dukane SeaCom NA1 Underwater Accoustic
Fig 2 Dukane N30A5B Beacon Receiver
Dukane N30A5B Beacon Receiver

Fig 1 Radatron Protector Model 8502 Ultrasonic Burglar Alarm
Radatron Protector Model 8502 Ultrasonic
                      Burglar Alarm
Fig 2 Radatron Protector Model 8502 Ultrasonic Burglar Alarm
Radatron Protector Model 8502 Ultrasonic
                      Burglar Alarm

Fig 3 Radatron Protector Model 8502 Ultrasonic Burglar Alarm
Radatron Protector Model 8502 Ultrasonic
                      Burglar Alarm
Fig 4 Radatron Protector Model 8502 Ultrasonic Burglar Alarm
Radatron Protector Model 8502 Ultrasonic
                      Burglar Alarm

Fig 5  Marten (mouse?) Repeller.
Runs on 12 VDC <= 20 mA.
UltraSonic Repeller
Fig 6 Looks like a uC driving a LED and the speaker.
There's provision for a second function/speaker/device).
The lower left pin on the DC regulator IC shows 5.0 Volts.
UltraSonic Repeller


Underwater ultrasound

Some of these patents look a lot like the transducer on the CRT-1 sonobuoy that dates to W.W.II.
2803807 Audible Underwater Signal, F.E. Butler, Navy, Aug 20, 1957, - for use on practice torpedo, triggered by the exploder to make a very loud noise.

3587038 Ultrasonic homing beacon and communication equipment for underwater swimmers, Frank Massa Jr, Dynamics Corp America, Jun 22, 1971 - 367/118, 367/120, 367/910 
Method of and apparatus for detecting and locating sound, &c. Elias E Ries, (Jun 20, 1912) Jul 26, 1921, 367/120, 342/350
                Stereo underwater microphones & steres headphones

3005183 Underwater transmitter Fred M Mayes, (Jan 10, 1951) Oct 17, 1961, 367/137, 181/125, 367/142, 114/20.1, 102/395, 367/166 
2460316 Echo ranging and listening gear, Horace M Trent, Thomas F Jones, (Jul 31, 1944), Feb 1, 1949, 367/107, 367/137, 340/566, 367/901
                 Battery operated device capable of use for the location of submarines by direct audio listening: super audio listening or by echo ranging.

3079583 Sonar calibrator Herbert R Beitscher, George A Coates, Royal H Akin, Sec of Navy, Feb 26, 1963, 367/13, 455/84, 331/59, 73/1.82, 331/69, 367/910, 455/78 - small cylindrical battery powered transistor based 20 kHz barium titanate transducer is placed in contact with the sonar transducer and can check Rx or Tx functinality.
Fish finder, Rollind  & John Holloway Electronics World, Mar 3, 1964, 367/94, 367/910, 181/125, 367/104, 367/173, 43/17.1 -
                 Decsector for sound & ultrasound

Piezoelectric voice range transducer, Sims Claude C, May 16, 1967, 367/157 -    stack of ferroelectric elements
Ultrasonic homing beacon and communication equipment for underwater swimmers, Frank Massa Jr, Dynamics Corp America, Jan 13, 1970, 367/120, 367/910 - a 40 to 80 kHz range directional receiver for use by an underwater diver to locate a beacon.
2935728 Underwater object locator, Adolph R Morgan, Rca Corp, (Feb 15, 1946), May 3, 1960, 367/101, 367/910, 367/107, 367/116
                probably classified during W.W.II.  Uses an FM modulated (not pulsed) ultrasonic signal in the 500 kHz to 1 MHz range.
3005183 (see above)
3079583 (see above)
3123798 (see above)
3262094 Discontinuous hollow cylindrical transducer, Camp Leon W, Jul 19, 1966, 367/156, 367/151 - magnetostrction transducer
2311079 Transducer, Parr Jr Josephus O, (Mar 28, 1940) Feb 16, 1943, 367/182, 336/30 - broader bandwidth & more efficient
2468837 Magnetostrictive transducer, Peck Jr Robert L, Bell Telephone Labor Inc, (Aug 2, 1945) May 3, 1949, 367/168, 366/127
2631271 Tubular hydrophone, A.L. Thuras, Sec of Navy, Mar 10, 1953, 367/168 - a device for generating or receiving sound signals at sonic or ultrasonic frequencies, and more particulary to an underwater transdecer of the tublar magnetostrictive type having a toroidal-would coil for converting compressional wave energy into electrical energy or vice versa.
2521136 Hydrophone, A.L. Thuras, Sec of Navy, (Apr 28, 1949) Sep 5, 1950, 310/26, 381/190, 367/168, 381/163
2005741 Magneto-strictive sound generator, Hayes Harvey C, (Dec 15, 1932) Jun 25,1935, 367/178, 318/118, 181/157, 367/168, 381/190, 310/26 

2398117 Magnetostrictive oscillator, Elias Claesson Per Harry, Fabian Rost Helge, (May 3, 1941) Apr 9, 1946 - 367/151, 381/190, 310/26, 367/156
            2438926 Magnetostrictive supersonic transducer, Mott Edward E, Bell Telephone Labor Inc, (Aug 18, 1944) Apr 6, 1948 - 367/168, 381/190, 335/215, 310/26
2834000 Sound detecting device, Wiggins Alpha M, Electro Voice, (Dec 9, 1953) May 6, 1958, 367/155, 367/173 - barium titanate & aluminum stack
2891232 Hydrophone for directional listening buoy, Heinrich O Benecke, (Jun 28, 1955) Jun 16, 1959, 367/151, 367/153, 343/844
3021504 Apparatus for controlling the effective compressibility of a liquid, William J Toulis, Feb 13, 1962, 367/150, 181/402, 367/151 - shaping underwater beam  to 60 kHz.
3160769 Magnetostrictive transducer, Abbott Frank R, Dec 8, 1964, 310/26, 367/168, 367/156, 318/118, 367/160 -


Sonobuoys - CRT-1


2447333 Ultra-audible sound reception, Harvey C Hayes, Navy, App: 1931-12-30 (SECRET) Pub: 1948-08-17, 367/141; 73/649; 310/335; 73/645; 310/326; 340/566 -



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