LETTER TO/FROM (DELETED) RE DOG TRAINING WITH ATTACHED REPORT DISCUSSING ULTRASONIC SIGNAL SYSTEM

• Document Type: SPECIALCOLLECTION
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): 00173978
• Release Decision: RIPPUB
• Original Classification: U
• Document Page Count: 4
• Document Creation Date: January 21, 2025
• Document Release Date: January 15, 1983
• Publication Date: September 29, 1966

September 29, 1966
en&
Dear
Attached are a few thoughts related to items we discussed during
. _ . .
my recent visit. Thanks to you and . II feel that the visit was
_ .
extremely fruitful and trust that it will be possible to periodically .
duplicate the experience.
By now you may have heard is due back this week.
However, I have included some miscellaneous systems specs and
costs for the ultrasonic signal device.
I'm afraid I mislead lregarding a competing dog training
kit. It turned out to be only a book containing instructions for making
a home-made skinner box out of cardboard and mailing tubes.
Thank you again for the demonstrations, tours, and discussions
which Iprovided.
SinnQrely,
�
�
1. Ultrasonic Signal System
Several commercially available sphericon "tweeters" advertise
a response up to 30-40 Kc. The literature which we have seen suggests
that these claims need to be supplemented by efficiency and power
ratings at frequencies above 15 Kc. An inexpensive speaker which
you might try is:
Lafayette 21R5715 Sphericon Tweeter @ $14.40
(Lafayette Radio Electronics, 111 Jericho Turnpike, Syosset,
L.I., New York).
We
could test these speakers and provide you with�approximate power
levels radiated at various. frequencies and input power, select an
appropriate amplifier and ocsillators, and ship the system to you
,vithin a period of about 2 weeks. Coit for two variable frequency
generators, 30 watt amplifier, speaker, and testing would amount to
$325.00.
2. Field Detector for Ultrasound
The sphericon.speakers can be used as rather crude and cheap
microphones and could provide a simple technique for determining if
moderate to large amounts of ultrasonic energy are being radiated in
the field. You could filter the output of one of the above speakers,
amplify, and display the signal voltage on a meter. The microphone
would have to be positioned close to the speaker.
If we were to supply the signal system we could also provide a
self-contained detector system for an additional $:115.00.
Because of the many transmission problems associated with
ultrasonic energy in the presence of wind or thermal gradients it
-2-
would be advantageous to consider an r. f. command system and signal
generation at the platform. To evaluate the training problems associated
with the generation of signals at the beast yau could assemble a low cost
model plane R. C. system which gates ultrasonic signal oscillators to
an electrostatic transducer. It is possible that the transducer could
be eliminated if sufficient ultrasonic energy is radiated directly from
the oscillator components, in which case the R. C. would have to switch
the oscillators on and off. Weight should be less than 4 oz. using off-
the-shelf inexpensive gear. )could assemble such a system
and evaluate the circuit component radiation if desired.
3.
lean be ordered from:
�
It might be simpler and less expensive to effect recall by merely
1
4.
iRelease
R. F. command receiver/actuator packages can be constructed which
weigh less than \ To prevent undesired release
�ft.
-3-
by chance interference a logic circuit would be desirable, but this could
consist of
For training
purposes a low cost model R. C. unit can be used. A test unit can be
purchased directly from a model supply house (such as those described
in the advertisement left with you.) If the available model units prove
too heavy or unsuitable for your application could assemble
_
a low cost receiver/actuator pkg.
tailored to your training situation.
.land is