OPERATIONAL CHARACTERISTICS FOR A SPECIAL PURPOSE DF SET (SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A001400010002-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 9
• Document Creation Date: December 23, 2016
• Document Release Date: April 7, 2014
• Sequence Number: 2
• Publication Date: September 9, 1952
• Content Type: MISC

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Declassified in Part - Sanitized Copy Approved for Release 2014/04/07. CIA-RDP78-03535A001400010002-2
S7Ctirit.lci I nformatiroti
OPERATIONAL CHARACTERISTICS
FORA
SPECIAL PURPOSE DF SET
Approved by :
DOC U ',A EN TN?.
NO CHANGE IN CLASS.
D DECLASSiFIED
CLASS. CHANGED TO: TS
NEXT REVIEW DATE:
S 6)10te>fik'
DATE.--.-REViVAIES: _01 Cifls-.6
52-2083-102
copy of
Chairman, Research, Development,
and Production Review Board
tztiity Information'
9 September 1952
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/07: CIA-RDP78-03535A001400010002-2
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OPERATIONAL CHARACTERISTICS
FORA
SPECIAL PURPOSE DF SE1
1. GENERAL INFORMATION
1.1. OBJECTIVE
The objective of this development program is to fulfill
a requirement for a portable, compact, concealable
Radio Direction Finder.
1.2. PROPOSED SERVICE EMPLOYMENT
This equipment shall normally be concealed upon the
operator's person and will be operated under these
conditions. Short-range detection and location of the
source of radio signals shall be possible.
1.2.1. Walk-In
This equipment shall be suitable for walk-in operations.
1.2.2. Drop-In
This equipment shall be adaptable for drop-in operations.
1.2.3. Stay-Behind
This equipment shall be adaptable to stay-behind opera-
tions.
1.3. FUNCTIONAL REQUIREMENTS
This equipment shall be used for close-range, covert,
detection and location of radio transmitter activity.
1.4. BACKGROUND,
Portable, clandestinely-operated, DF equipment of this
type does not presently exist.
(77-777
Cecur4 armafroff
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SeCUrity2inibrmztiong.
2.
2.1.
.SPECIAL PURPOSE DF SET
OPERATIONAL CHARACTERISTICS
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(CONTINUED)
FREQUENCY COVERAGE
The tuning range of this equipment shall be from 2 mc.
to 16 mc.
2.2.
EMISSION DESIGNATION
The equipment will be suitable for the detection of AN,
CW, and MCW emission.
2.3.
RANGE AND SENSITIVITY
Ordinarily, the range of this equipment will be approxi?
mately one mile. However, this range figure could be
increased many times, depending on the power of the
transmitter being monitored. The space sensitivity will
be between 50 and 100 microvolts per meter.
2.4.
OPERATION
The normal operating position of the subject equipment
will be on a belt strapped around the waist of the
operator and will allow operation of the controls in
this position.
2.5.
CALIBRATION ACCURACY
The calibration accuracy shall be maintained within 1/2
of 1 per cent.
2.6.
INTERFERENCE ELIMINATION
Image rejection shall be 20 db. or better. IF rejection
shall be 30 db. or better. Spurious responses shall be
down 35 db or better.
2.7.
STABILITY
Instability due to any cause after warm?up shall not
exceed 300 cycles per second.
2.8.
RESOLUTION AND DISCRIMINATION
The band width shall not be greater than 3 kc at 10 db.
down or 5 kc at 30 db. down.
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2014/04/07
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CIA-RDP78-03535A001400010002-2
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SPECIAL PURPOSE DF SET
(CONTINUED)
2.9.
FIDELITY
The fidelity shall be
reception.
sufficient
for intelligible voice
2.10.
SPECIAL FEATURES
If possible, a bandswitch shall be provided for complete
frequency coverage in three bands. Otherwise, separate
plug-in coils shall be used.
3. PHYSICAL CHARACTERISTICS
3.1. WEIGHT
Weight shall be no more than 2.5 pounds exclusive of
batteries.
3.2. SIZE
The size shall not exceed 60 cubic inches.
3.3. ANTICIPATED POWER SUPPLY REQUIREMENTS
If feasible, mercury cells shall be used; otherwise,
standard dry cells shall be used.
3.4. REQUIREMENTS FOR OPERATION, TRANSPORTATION, PACKAGING,
AND STORAGE CONDITIONS
3.4.1. Climatic Requirements
3.4.1.1. Temperature Extremes
3.4.1.1.1. Storage
The equipment shall be capable of being stored at
temperatures of minus 25 to plus 60 degrees Centigrade.
3.4.1.1.2. Operation
The equipment shall operate at temperatures that will
exist under the operator's clothing at ambient tempera-
tures of minus 25 to plus 50 degrees Centigrade.
SEPirj
Security Information
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Security Information
SPECIAL PURPOSE DF SET
(CONTINUED)
3.4.1.2. Humidity Extremes
The equipment shall be capable of operating under condi-
tions of 100 per cent relative humidity.
3.4.1.3. Atmospheric Pressures and Precipitation
The equipment shall be capable of operating at altitudes
up to and including 10,000 feet. The equipment shall
also be capable of operation with only the protection
afforded by the operator's clothing.
3.4.1.4. Dust and Spray '
The equipment shall be capable of operation with the
protection normally afforded by the operator's clothing.
Severity of the dust or spray condition is limited by
the ability of the operator to withstand such conditions.
3.4.1.5. Immersion
The equipment shall not be immersion-proof.
Tropicalization
Protection against fungus growth shall be provided.
Vibration and Shock
The equipment shall be sufficiently rugged to withstand
the vibration and shock that will be experienced by the
equipment when strapped to the leg of a running person.
3.4.4. Packaging and Packing, for Domestic and Overseas Shipment
3.4.4.1. Domestic
Packaging for domestic shipment shall be of the type in
general commercial use for the subject equipment. It
shall provide maximum protection from normal hazards of
handling and transportation and shall be of the type to
insure acceptance at and safe delivery to the designated
point by common or other carriers at the lowest applicable
rate.
SECRET
Security Information
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Cecurity
In;ormalW
SPECIAL PURPOSE DF SET
(CONTINUED)
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3.4.4.2.
Overseas
For overseas shipment these units shall be well-
cushioned, sealed in vapor-proof barrier bags, and
packed in water-resistant cartons before crating.
3.4.5.
Packaging and Packing for Special Operations
This shall be done by the consumer.
3.5.
SPECIAL FEATURES
There are several special features which characterize
this equipment:
3?5?1?
The unit must be shaped to "fit yt the body.
3.5.2.
The earphone unit will be of the standard hearing-aid
type.
3.5.3.
If possible, the directional antenna shall be built
into the receiver unit. ,Otherwise, the antenna shall
be external to the receiver case and concealable on
the operator.
EQUIPMENT OPERATION AND MAINTENANCE CHARACTERISTICS
4.1.
DUTY CYCLE AND WARM-UP
4.1.1.
Duty Cycle
The equipment shall be
Capable of continuous operation
for 6 to 8 hours on one set of batteries.
4.1.2.
Warm-E2
The maximum allowable time for warm-up shall not exceed
30 seconds.
4.2.
DEGREE OF COMPLEXITY OF OPERATION
The operation of this equipment shall be no more complex
than the tuning of a simple short-wave receiver.
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2014/04/07
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: CIA-RDP78-03535A001400010002-2
SPECIAL PURPOSE DF SET
(CONTINUED)
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4.3.
MAINTENANCE AND REPAIR
4.3.1.
Alignment and Calibration
calibrated prior to
The units should be aligned and
issuance so as to safeguard against shipping damage.
4.3.2.
Preventive Maintenance
No preventive maintenance
program is planned for this
equipment. Normal precautionary measures, such as
removing batteries prior to storage, etc., shall be
necessary.
4.3.3.
Periodic Overhaul
There will be no definite
equipment.
overhaul periods for this
4.3.4.
Spare Parts Lists
Spare parts lists shall
base station maintenance.
be supplied for both field and
4.3.5.
Personnel Safety Requirements
Special safety precaution's shall
not be necessary..
4.3.6.
Test Equipment Required
For base station maintenance, standard
radio test equip-
ment will be required. For field station maintenance,
no test equipment is required.
4.3.7.
Operational and Maintenance Instructions
4.3.7.1.
Name-Plate Instructions
All controls will be identified as to their function and
direction of operation.
4.3.7.2.
Instruction Manuals
Instruction manuals shall be supplied.
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SPECIAL PURPOSE DF SET
(CONTINUED)
5. COMPATIBILITY WITH EXISTING OR PLANNED EQUIPMENT
The equipment shall be compatible with existing or planned
direction finding equipment operating within the frequency
range of 2 mc. to 16 mc.
6. QUANTITY OF UNITS TO BE PRODUCED
7. AVAILABILITY FOR OVERSEAS SHIPMENT
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/07: CIA-RDP78-03535A001400010002-2
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