Doc 0000021970

The provided image is primarily text-based, with a large title "THE BLACK VAULT" in a stylized font. To the left of the text is a graphic representation of a bank vault door, complete with a circular locking mechanism and various gears and levers. The text beneath the title explains that this document was obtained from "The Black Vault," an online database of declassified government documents, specifically mentioning the MKULTRA/Mind Control Collection. It further states that the collection contains over 20,000 pages declassified by the CIA and provides a URL for accessing the entire collection. There are no handwritten annotations, signatures, official stamps, forms, diagrams, tables, redactions, or visual evidence of experimental procedures visible in this image. ...~ .3"--.-r.- .--~•~ -- • ... ··~·. ......... --·-- ~.-..... -~- • o"',"J. ---·-~--.... --~-~-~··----~---- "" ..... ._..._._ ' • . ? • 5 February 1973 .. ..... ..... --·-··- -·-~ ..-.-......__ MEMOEANDUM FOR: SUBJECT: INTRODUCTION The following observations and opinions to: pe~tain a,. the concept of field effect monitoring b. the equipment delivered by the 'I • > Co suggestions for fUrther research STATEMENT OF THE TECBNIQUE A short antenna ("e.g., 18" of wire mounted vertically in the air above an insulating support) wiil take on an electrical potential which will var,y in response to the tima variation of the electrical field in .J its rtcini ty. In particular, · : · _ . . ) cause cyclic variation of the potential on the antenna J which correlates to "the Con~ aider the instantaneous potential on the antenna to be a scalar, uniform over the surface of the antenna (its length is \"ery much smaller than the wave length of the signal, e.g., 60Hz has a wa\~ length of 3100 miles). Tne amplitude of the signal is a.function of the magnitude of the \ the · {-antenna. distance, the relative humidity, the ;rthe degree of static charge of the J to mime ·just a few. The signal frequency range extends from DC to· i"ess than 100 Hertz. . .-. ....... ................. ____. .. __ ... -··-__ .................. ......_. . .... - .. -... ----·~ ~.---.-~.<-~-"-----"_.., ------·~ ~----------.., . ~ .J ............. ' :..IMITATIONS OF THE TECHNIG,TJE A m.aj or problem with using such an antenna to intercept -_ ----------~ --~is its sensitivity to extraneous signa~ soi.trces. It be usefUl to select one.out of a set vf potential sources by means wou~d of some appro~riate combination of shielding or enhanced directivity of the a:1tenna. Antenna theory suggests that directivity cannot be er:C.<=-rtced by means of antenna configuration for a~ practical purposes tecause the anten.""'la size and the opacing between elements of an antenna array will. always be vanishingly small compared with a wavelength. The wave .lenSth of 100Hz wave is: c _ 3xlo8 m/sec f - 102 sec-1 = 3000km Therefore, shielding or shaping of the field must be used to advantage if possible. Another present limitation of the technique is the lack of know- 1 ledge required fur reliable interpretation of the signals acquired. · · · ··· · · 1 informatioi'l should be reliable given an adequate signal-to-noise The document is a typed memorandum with a date of "5 February 1973". It includes headings for "MEMORANDUM FOR", "SUBJECT", "INTRODUCTION", and "STATEMENT OF THE TECHNIQUE". Several paragraphs of text are present, detailing technical concepts related to antennas and electrical fields. There are also what appear to be handwritten annotations or markings, including a bracketed number "239" circled in the bottom right corner and some less decipherable marks above and to the left of this. The document does not contain any photographs, diagrams, or official stamps like "CLASSIFIED". Therefore, shielding or shaping of the field must be used to advantage if possible. Another present limitation of the technique is the lack of know- 1 ledge required fur reliable interpretation of the signals acquired. · · · ··· · · 1 informatioi'l should be reliable given an adequate signal-to-noise 1 ratic, but waveform analysis for detection and evaluation -- -· - --_ woul.d require considerablP. additional researc~. (~his comment is made prior to receipt of the JFina~ Report.) Finally, since the antenna sits in the near field of the source, signals received will fall off as the cube the distance. If the o~ signd is tangential at 1 meLer~ the signal vill be- 18 db down at 2 meters, and 28 db down at 3 meters. Signal-to-noise ratio is critical whenever data recording is done on a machine of finite dynamic:range. (The TEAC recorder supplied has .J a dynamic range of about 35 db l THE PRCJrOTYFE EQUIPMENT t J The . . equipment received from t~ . . _ was evaluated. The unit much as expected, and was abl2 brie~ly pe~formed to provide outputs clearly showing _. . _ . -· ~ ·-______ . ·--J from I a . as distances up to about 1 meter.· ·The signal quality rapidly deteriorates with range, as expected. increasi~g The unit has a rather poor battery life, rated at three hours in the instruction manual. -2- .. , p-'t' D r The operating time could be approximately t=ipled by instal ling larger battery parks the unused spaces the case. A i~ o~ suggestion: if battery life is a serious consideration, and the unit undergoes design revisions, replace the circuitry with micro power components. Newly available operational azplifiers can run on as lov as 1.75 volt~, drawing a few hundred microwatts. The present equipment, exclusive of the recorder, requires about 1.9 watts. The tape recorder draws about 2.4 watts. The unit is rather inconvenient to operate 3ince it requir~s battery ~eplacement prior to each use, and a car?eul set-up of gain contrc·ls under conditions closely approximating those expected operational.ly, "As previously noted, the signal amplitude is quite range dependent and pro bably considerably with environmental such as the ·-·- · -v··a-=-~-·e-s- ---··---J cir~umstances Automatic gain controls or logarithmic amplifiers :;:~cb~.;::~idered in order to opt=ize u-. o<_j;h-"_!ape_~•.SOLl I ~3- This page is a typed document with no photographs, handwritten annotations, signatures, stamps, forms, diagrams, or tables. There are no visible redactions or obscured content. The page appears to be a section of a technical report discussing limitations of a technique and prototype equipment. The text is presented in paragraphs with a distinct heading, and there is a page number '-2' at the bottom. the signal amplitude is quite range dependent and pro bably considerably with environmental such as the ·-·- · -v··a-=-~-·e-s- ---··---J cir~umstances Automatic gain controls or logarithmic amplifiers :;:~cb~.;::~idered in order to opt=ize u-. o<_j;h-"_!ape_~•.SOLl I ~3- The document page appears to be a typed report with some faint markings and a small stamp in the top left corner. The stamp features a design that is not clearly discernible due to its size and the image quality. There are no photographs of people, locations, or equipment, nor any handwritten annotations or official stamps of classification. The content is solely text, discussing operating time, circuitry, and technical specifications of what seems to be some form of recording device. A small page number "-3-" is visible at the bottom center of the page. There is no visible evidence of experimental procedures or facilities.