Urgent teletype Portland to Seattle re VOR and marker beacon receivers as tracking devices
Document date 29 November 1971
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Id: Cooper-Part-70:323-324
Subject: Cooper Files: Cooper-Part-70:323-324 Document: Urgent teletype Portland to Seattle re VOR and marker beacon receivers as tracking devices Id: Cooper-Part-70:323-324 Page: https://cooper.theunsolved.net/documents/Cooper-Part-70%3A323-324 What is wrong (title, date, type, which pages belong together, copies)? What does the scan show?
A person reads every report. Corrections are made by hand, to the data — titles, dates, names, which pages belong together — never to the scans, and they can take a while to appear.
FBI 164-81, Vault Part 70 pp. 323–324 (DB Cooper-30175–30176), Teletype, dated 29 Nov 1971, serial SE 164-81-323 (as read from the transcript) — cooper.theunsolved.net/documents/Cooper-Part-70%3A323-324
2.6" x 3.2" x 10.7 WEIGHT: 2.7 LBS SUB TRANSMITTERS
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NR 004 PD PLAIN 5:26 URGENT 11-29271 LJQ TO: SEATTLE (164-81) FROM: PORTLAND (164-41) P 2P
UNSUB; NORTHWEST AIRLINES FLIGHT THREE ZERO FIVE, NOVEMBER TWENTYFOUR, SEVENTYONE. CAA - HIGHJACKING; EXTORTION. OO: SEATTLE.
RE SEATTLE TELETYPE TO PORTLAND, NOVEMBER TWENTYNINE, SEVENTY- ONE; AND PORTLAND TELEPHONE CALL TO SEATTLE, SAME DATE.
[REDACTED] WAS CONTACTED AND ADVISED A VOR RECEIVING DEVICE WOULD BE TOO BULKY TO BE CARRIED ABOARD THE FLIGHT UNSEEN, AND DUE TO THE TECHNICAL EFFORT OF THE DEVICE, IT WOULD PROBABLY REQUIRE A GOOD DEAL OF TRAINING IN ORDER TO OPERATE IT. HE ADVISED THE SMALLEST MODEL OF THE VOR RECEIVING DEVICE IS TWO POINT SIX INCHES BY THREE POINT TWO INCHES BY TEN POINT SEVEN IN LENGTH, WEIGHING TWO POINT SEVEN POUNDS. SUCH A RECEIVER WOULD REQUIRE A TWELVE VOLT BATTERY TO OPERATE PROPERLY, AND HORIZONTAL - POLARIZED ANTENNA APPROXIMATELY THREE FEET IN LENGTH WH[guess: ICH] WOULD EITHER HAVE TO BE EXTENDED FROM THE AIRPLANE OR ATTACHED TO THE WINDOW IN A VERTICAL POSIT[guess: ION]. END PAGE ONE
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Sub. N.
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SEARCHED......INDEXED...... SERIALIZED......FILED...... NOV 29 1971
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164-81- 323 DB Cooper-30175
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b6 b7C
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[guess: a 5 A] [illegible] [illegible] Su[illegible]
PD 164-41 PWGE TWO
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[REDACTED] ADVISED THE MOST LIKELY DEVICE TO BE USED IN SUCH A MANNER, AND DUE TO THE FLIGHT OF THE AIRCRAFT, WOULD BE THE MARKER BEACON RECEIVER, WHICH ACCORDING TO [REDACTED], COULD BE MADE BY ANY PERSON WPTH THE SLIGHTEST KNOWLEDGE OF COMMUNICATION OR RADIO EQUIPMENT. SUCH A DEVICE COULD BE THE SIZE OF A PACKAGE OF CIGARETTES OR FOR A MORE EXACTING DEVICE, COULD BE ANY SIZE.
[REDACTED] ADVISED THATHTHE BEACON RECEIVER WOULD WORK ON A NINE VOLT TRANSISTOR BATTERY AND SERIES WITH A NORMWL FLASHLIGHT BATTERY. SUCH A DEVICE CAN BE PURCHASED FROM ANY OF THE AVIATION COMPANIES FOR APPROXIMATELY TWO HUNDRED SEVENTYFIVE DOLLARS, WHICH [REDACTED] ADVISED IS THE MINIMUM PRICE. ACCORDING TO [REDACTED], THE MARKER BEACON RECEIVER WILL NOT INTERFER WITH ANY OF THE AIRCRAFT INSTRU- MENTS, NOR CAN IT BE DETECTED WHILE IN USE.
[REDACTED] ADVISED THE DISTRIBUTORS OF SUCH A DEVPCE IS NARCO AVIONICS, WHICH HAS DISTRIBUTORS THROUGHOUT THE COUNTRY, INCLUDING FIVE IN OREGON AND FIVE IN WASHINGTON.
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BASED UPON THE ABOVE INFORMATION AND PORTLAND TELEPHONE CALL TO SEATTLE, IT IS SUGGESTED SEATTLE DIVISION REEVALUATE LEADS SET OUT IN REFERENCED COMMUNICATIOM.
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CORR PAGE ONE THRID LINE FOURTH FOXX WORD SHLD READ [REDACTED] AND ELEVENTH LINE LAST WORD SHLD READ POLARIZED
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DB Cooper-30176
Serials: PD 164-41, SE 164-81, SE 164-81-323
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