LETTER TO (SANITIZED) FROM (SANITIZED)

Document Type: 
Collection: 
Document Number (FOIA) /ESDN (CREST): 
CIA-RDP78-03424A000500010005-2
Release Decision: 
RIPPUB
Original Classification: 
S
Document Page Count: 
4
Document Creation Date: 
December 22, 2016
Document Release Date: 
April 10, 2012
Sequence Number: 
5
Case Number: 
Publication Date: 
February 4, 1957
Content Type: 
LETTER
File: 
AttachmentSize
PDF icon CIA-RDP78-03424A000500010005-2.pdf180.43 KB
Body: 
Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2 25X1 "01IT01" CONFIDENTIAL ILLEGIB ?a. lob 404M MW VS St 25X1 ui DO$ _REV DATE 1 see RYY OR1G COMP ,'m OPI TYPE ORIG CLASS -S-- PAGES REV CLASS JUST .22 NEXT REV AUTNI HR 16.1 aeler* CONFIDENTIAL Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2 Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2 CONFIDENTIAL s 1 I7 NDENTIAL i 25X1 25X1 Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2 Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2 0 t 174 Hours 120 Hours 112 Hoar s 8 Hours 19 Hours 132 Hours 138 Hours TOTAL 703 Hours II. Trips and Conferences: None. III. Work Done Lfuring Period: During this report period, work has been continued in the following areas. 1) Variable Reluctance Modulators Now core materials, obtained from the Subsection, have shown the feasibility of extending the operating range of these devices to approximately 25 Mc/sec. Present work is directed towards the location of unbalance causing an unsymmetrical modulation pattern of the balanced modulator configuration. Such unbalanced conditions can be cancelled for one carrier frequency by adjustment of the operating point of a driver transistor, but this correction does not hold over a wide frequency range. With a well balanced care, however, it should be possible to vary the carrier frequency over a wide range without affecting the modulation pattern. 2) Mode Amplifiers An investigation of various types of diode amplifier output stages was conducted during the present reporting period. A "push-pall" type circuit arranement was demonstrated to be both feasible and practical. A six stage, direct coupled audio amplifier was constructed having an input signal level of 5 millivolts at a 20, 000 ohm impedance level with approximately 2 volts 0 Personnel: Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2 Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2 0 0 output across a ISO ohm. toad resistance. A low level A-M modulator employing storage diodes was developed which has an advantage over conventional diode modulators in that the storage of carriers is utilised to produce audio power gala. The feasibility of utilising a single tranxistor oscillator as the clock power supply was demonstrated in conjunction with this A-M modulator circuit. Activity in the diode amplifier field will be continued in an attempt to develop additional circuits having practical application in radio systems. 3) Remote Tuning L"evice (me of the major troubles experienced with these devices during previous experimentation was what appeared to be contact bounce of the actuating switch. A closer study of the effect shows that apparently much of the trouble experienced is due to ringing of the quantiser core. Attempts to eliminate this by redesigning the quantiser core and windings have been made and the results of these changes are presently under investigation. If these changes show the desired results, it will improve the repeatability of irequsacy settings considerably. In that case the nest study phase will be on the improvement of the linearity of the frequency vs. number of set pulses characteristic. 9 4) Photo-Electronic Circuits Measurements have been taken to explore the possibility of using fast photo-conductors. The general results were not promising - the sensitivity of the C was too low in all cases. The PC elements used were Lead Sulphide "Getron" and' l ktson" cells and large area p-e photo-junctions (solar cells). Work has been done an the development of basic logical elements for computer circuits. This work has been directed towards obtaining the optimum speed with the available materials. Some of these circuits will be combined to form more complex logic sets, such as half- adders and shift registers. If time permits, an analysis will be shade of the symmetrical bistable stage with a view to obtaining design data necessary for obtaining maxiinuxn speed of operation. 0 IV. Plans for Next Month. During the said report period, work will be continued as indicated in the foregoing paragraphs. In addition, the present series of measurement being made on "Magnistors" used as electrical tuning elements will be continued. Their frequency stability as a function of temperature is being determined. Two approaches have recently bean taken :n the magneto-resistive field. One has been towards the development of a contact plating technique for slabs of Declassified in Part - Sanitized Copy Approved for Release 2012/04/10: CIA-RDP78-03424A000500010005-2