COMMUNICATIONS ZONE INDICATOR AN/GPQ-3

Document Type: 
Collection: 
Document Number (FOIA) /ESDN (CREST): 
CIA-RDP78-03535A001800010015-4
Release Decision: 
RIPPUB
Original Classification: 
S
Document Page Count: 
2
Document Creation Date: 
December 27, 2016
Document Release Date: 
September 13, 2012
Sequence Number: 
15
Case Number: 
Publication Date: 
July 31, 1952
Content Type: 
MISC
File: 
AttachmentSize
PDF icon CIA-RDP78-03535A001800010015-4.pdf197.8 KB
Body: 
Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A001800010015-4 aLurtc. , _ - , , ROUTINenAMIIRECIIMb SHEET . .,-,-?- . _.? - ? INSTRUCTIONS: Officer designations should be used in the "TO" column. Under each comment a line should be drawn across sheet and each comment numbered to correspond with the number in the "TO" column. Each officer should initial (check mark insufficient) before further routing. This Routing and Record Sheet should be returned to Registry. FROM: 8 y- 42 , NO. DATE TO ROOM NO. DATE OFFICER'S COMMENTS RECD FWD'D 1. 0 ...- ----- / 1 4 4 ?4".?"42 6.fri."...r."_./Loc.....e 9*-40- cr-,_____ . , . ? 4,....INITIALS 3. ....4 4. ? - - ' , , i ? --imirif~r11/0X q.'" 6. 7.----- i - ? ? ? 4, 1 ? ,Pff P- di "Nommiiii. 4 IP t IF 4 , SA il l Illitlihalip,r.- IA 8. 9. I/ arl weel I FA PI IP r. . " ?1?11. - - 10. II / , Ar....t.de, 11111111,6111111P1b6,. i r 1511,4 11. 12. 1--A02.- ? 573_ p 2. ifjj 0.4.4, 13. . 14. 15. FORM NO. 51-10 FEB 1950 SECRET Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A001800010015-4 16-61155-1 U. S. GOVERNMENT PRINTING OFFICE 4. Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A001800010015-4 ? ger erence Di for Scturity Informatioff ?a Inte DOCUMENTN0. NO CHANGE IN CLASS DECLASSIFiED ebLASS. CHANGED TO: TS S C NEXT REVIEV7 DAT"'? ALITH: 0-2 41:2 REVI FWFR ? 0371&9 ions Zone Indica to of 3 June 1952 from. Asistant Director,for Scientific a 14 The Communications Zone Indicator ystem,its generally ed, has been known to this office throughout the phases of develop. work leading to the equipment. An engineer fromthis office visited the Raytheon Plant on 16 May 1951 to inspect the development progress of this project at the invitation of the United States Air Force, 2* This inspection trip gave an opp unity to obscure the developmental t in actual use. From this observation t was apparent that the does just about what has been claimed for it. With this equipment it le to determine within reasonable limits the skip distance or a given radio signal travels without being reflected to the earth and it is further possible to determine this information at a given requency at any given. time. With thin information at hand, it is possible to choose a frequency that will be suitable for the time and distance in- volved. 3. This equipment requires for its operation an antenna that has high directivity in the horizontal plane so that spaniel recolation of the re- turned signal may be made. If a large portion of the radio fretency spectrum met be tested for suitability for transmiseim* then it is also necessary that maw antennas of this type be erected or else that the antenna be non. frequency sensitive. If the nonefrequency scnait..ve type is chosen, then the antenna becomes toe large to rotate. 0' ? 4. To date, no application has been found for this equipment in cone junction, with communication activities or this Agency. It is understood that the USAF will test this equipment for application to rapid frequency determination, and the results of their tests shall be followed with interest, 5. The chief applieation for this equipment would appear to be in conjunction with ionospheric sounding work that is being conducted by the National Bureau of Standards. 6. Your continued interest and cooperation in keeping this advised In matters of common concern is both appreciated and welcom Vim/ JUL 31.19t_ vo, ? ostivEL Coordination 25X1 5332 25X1 cc: 00-0 S' MET - ? =4- crone dev/p Se cunty thformaftn, Declassified in Part - Sanitized Copy Approved for Release 2012/09/13: CIA-RDP78-03535A001800010015-4