PRELIMINARY SPECIFICATIONS FOR MAGNETIC DATA RECORDER SET

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001400060004-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 27, 2016
• Document Release Date: September 11, 2012
• Sequence Number: 4
• Content Type: REPORT

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PRELTMINARY SPECIFICATIONS FOR MAGNEile DATA RECORDER SET
1. SCOPE
c/S-7
1.1 Type. - This exhibit describes a compact, portable battery powered dual
channel tape recorder capable of recording data and synchronizing signals
simultaneously or capable'of recording voice signals using standard dual track
recording techniques,
1.2 Nomenclature. - Nomenclature for the Magnetic Tape Data Recorder Set and
components thereof will be furnished upon application to the procuringactivity.
2* APPLICABLE DOCUMENTS
2,1 The following specifications of the issue in effect on date of invitation
for bids, form a part of this exhibit to the extent specified herein;
'SPECIFICATIONS
Federal
TT-C-595 Colors; (For) Ready-Mixed Paints
WT-61a Tape, Recording, Magnetic Control and Reels
Recording Tape one quarter inch
Military
Mi1p-V-173 Varnish, Moisture - and Fungus-Resistant,
for the Treatment of Communications,
Electronics, and Associated Electrical
Equipment
JAN-J-641 Jacks, Telephone
MIL-E-4158 Electronic Equipment, Ground; General
Requirements for
MIL-P-15035 Plastic-Material, laminate, Thermosetting;
Sheets, Cotton-Fabric-Base, Phenolic-
Resin
(Copies of specifications required by contractors in connection with specific
procurement functions should be obtained from the procuring activity or as directed
by the contracting officer.)
3. REQUIREMENTS
3.1 Component Parts. - The Magnetic Tape Data Recorder Set shall consist of the
following items:
(a) 1 each recorder 1,v/tape and reels
? (b) 1 each microphone w/cord
(c) 1 each battery pack
(d) 1 each reproducer
DOC UV DATE ST
ORIS COMP OPI rom
ORIN CLASS
REIDCLASS
JUST --- NEXT REV ACTH:
3.2 General. - The requirements of Specification MIL-E-4158 are applicable as
requirements of this exhibit with the following additions or exceptions as identified
by the similarity of paragraph headings or subject.
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3.2.1.1 Cabling. - The cabling should be such that the subassemblies shall be
capable of separation for purposes of performing maintenance.
3.2.1.2 Protection of cables for other than radio-frequency use. - Wherever
a cable is used for carrying other than radio-frequency currents, it shall be
adequately protected from abrasion and possible shorting, especially at the
terminations.
3.2.1.3. Waterproofness. 7 The Magnetic Tape Data Recorder Set equipment cases ,
shall be reasonably waterproof (i.e., for resistance to perspiration and/or rain;
they are not expected to resist immersion in water).
3.2.1..4 Protective treatment. - When materials are used in the construction of
the Magnetic Tape Data Recorder Set which are subject to deterioration when exposed to
climatic and environmental conditions likely to occur during service usage, they
shall be protected against such deterioration in A manner that shall in no way
prevent coMplianceWith the performance requirements of this exhibit. The use of
any protective, coating which shall crack, chip, or scale with age or extremes of
climatic And environmental conditions shall be Avoided.
3.2.1.5 Gear assemblies. - Gear assemblies shall be properly aligned and meshed
and shall be operated without interference, tight spots, loose spots, or other
irregularities. Where required for accurate adjustment, gear assemblies shall be
free from backlash. Laminated thermosetting plastic gears and cams shall be type
FBI or FBM conforming to Specification MIL-P-15935 where only mechanical properties
are required, and type FBG or FBE where mechanical and electrical properties are
required.
3.2.1.6 Physical characteristics. - The recorder equipment shall be designed and
housed to allow maximum accessibility for maintenance, maximum operational ease and
minimum operator error. All units shall be made as small in physical volume as can be
reasonably obtained.
3.241.1 Service conditions (mechanical). The Magnetic Tape Data RecorderSet
shall be designed to be resistant to shock and vibration incurred in normal handling
and service, as specified in this exhibit, and to function satisfactorily when
subjected'tO the following service condition:
a. Orientation. - Inclination at any angle.
3.2.1.8 Service life. - The Magnetic Tape Data Recorder Set shall be capable of
operation for a period of one year without repairs that require more than one-half hour
of nonoperation per day for maintenance, with the exception of tube and battery replace-
ment. The operational period may start after an initial storage period not exceeding
2 years.
3.2.1.9 Encapsulation. - All non-movable parts shall be encapsulated.
3.3 Design. ? The detailed mechanical and electrical design of the equipment
shall be accomplished subject to the requirements of this exhibit. The requirements
are detailed only to the extent considered necessary to obtain the desired mechanical
and electrical performance. Any unit, item or part considered herein shall be
supplied even though that unit, item or part may not be specifically described or
called for in this exhibit. Reliability of operation with a minimum of maintenance
and adjustment is of paramount importance.
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3.4 Detailed requirements.
3.4.1 Performance. - The Recorder shall be capable of recording non-communication
type audio signals or voice frequency signals 25X1
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3.5 Details of Components. -
.3.5.1 Recorder.- The recorder shall consist of the main sub-miniature recording
assembly including the tape reels, batteries, recording amplifier and tape transport
mechanism.
3.5.1.1 14. - The recorder shall not exceed 5 3/4" x 4" x 1" in size including
batteries. Transistors and printed circuits techniques shall be employed wherever
a size and weight reduction could be obtained by the use thereof.
3.5.1.2 Weight. - The weight shall be minimized and shall not exceed 16 ounces.
,
3.5.1.3 Recording and Reproducing medium. - The recording medium shall consist
of Mylar magnetic tape.
3.5.1.4 Recording time. - The recorder shall be capable of dual track recording
with_22Anute recording time. A visual means of indicating time remaining shall be
prolillar. An automatic stop shall be provided to prevent tape breakage and/or
coming loose when end of tape supply is reached.
3.5.1.5 Speed Variation. - The magnetic tape speed shall be controlled entirely
by the speed of the driving capstan. The speed of recording medium on short and long
time recordings shall be essentially constant, with less than one per cent flutter and
wow.
3.5.1.6 Power Supply. - The recorder shall operate entirely from self-continued
,batteries. All dry batteries shall be of a type available from normal commercial
sources. The use of rechargeable dry batteries, such as the Yardney "Silver-Cell"
shall be Considered.
3.5.1.7 Power Supply. The
3.5.1.8 Frequency Response.
cycles/secolL 2db.
minimum battery life shall be from five to six hours.
- The frequency response shall be 100 to 10,000
3.5.1.9 Distortion.-- The distortion shall not exceed 15% for voice and data
signals ,or i of 1% distortion for the synchronizing signal.
,
305.1.10 Sensitivity. - The recorder with its associated microphone shall have
sufficient sensitivity to obtain an intelligible recording of a normal oonversational
voice level
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3.5.1.11 Signal to noise ratio. - The signal to noise ratio shall be at least
30 db measured as follows:
S Power recorded 1000 cps tone, at 15 per cent distortion.
N Noise power on medium previously run through the recorder with zero
recording level.
3.5.1.12 Automatic Record Volume Control. - Automatic record volume control shall
be provided capable of twenty (20) d.b. compression.
3.5.1.13 Recording_Level Control. - A recording level control (suitable potenti-
ometer) shall be provided.
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The control knob shall be indexed and designed to furnl25X1
a visual indication of. the level setting and permit the operator to perceive the
setting of the recording level by means of the tactile sense.
3.5.1.14 Noise. - The recorder shall be electrically and mechanically quiet.
There shall be no perceptible noise from the motor, either electrical or mechanical.
3.5.1.15 Erase. - No provisions are required for erasing the medium in the
recorder. Pre-erased medium shall be used. Provision for accomplishing erasure shall
be made in the reproducer.
3.5.1.16 Control Switch. - The control switch shall he a push type switch which
shall control both amplifier and motor. It shall be so designed and mounted as to
permit positive operation and control with a minimum of effort, and provide for use of '
a remote control switch*
3.5.1.17 Fungus Resistance. - The recorder.shall be constructed of fungus resis-
tantAmaterials insofar as possible. Those materials not inherently fungus proof shall
be properly treated.
3.5.1.18 Rewind. - No provisions are required for rewinding the recorded medium
in the recorder. Rewind shall be accomplished in the reproducer.
3.5.1.19 Data Signals. - The recorder shall be capable of recording data signals
with repetition rates of from 50 to 1500 pulses per second.
305.1.20 Synchronizing Signal. - A four kc sine wave shall be generated and
recorded simultaneously on track 2 with the data signals recorded on track 1 for syn-
chronizing purposes.
3.5.19 The input connector for the microphone, data signals and 4 kc sine wave
signal shall be a Microdut or Amphenol 21598 connector.
3.5.2.1 Tape Reels. - The Tape reels shall contain sufficient recording medium
to permit one half hour continuous recording.
3.5.3 Microphone. - An external miniature microphone capable of concealment
under a tie pin, lapel, etc., shall be provided. This microphone shall be connected
to the recorder by approximately four feet of appropriate cable.
3.5.3.1 The microphone shall be capable of meeting the recorder service require-
ments as specified herein.
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3.5.4 Reproducer. - A suitable desk type reproducer shall be provided to perform
the playback function, also rewind and erase; for 115 V. A. C. 50 or 60 cps. Single
phase operation.
3.5.4.1 Size. - The overall dimensions of the reproducer, exclusive of handles
and other external hardware, shall not exceed 9 inches in height by 14 inches in depth
by 14 inches in width.
3.5.4.2 Carrying handle. - A carrying handle, suitable for rough service condi-
tions and formed to comfortably fit the hand, shall be securely mounted to the cabinet.
3.5.4.3 Monitor Jack. - Jack, Telephone TT-072 in accordance with Specification
JAN-J-641, shall provide a termination for the amplifier output. The jack shall
disconnect the loudspeaker whenever the headset plug is inserted and shall connect the
headset to the amplifier output.
3.5.4.4 Cabinet. - The equipment shall be inclosed in a drip proof, portable
metal cabinet.
3.5.4.5 Controls. - The following controls shall be provided as a minimum:
a. Power "ON - OFF" switch
b. Manual volume control to adjust the output level at
the headset or speaker during playback.
3.5.4.6 Forward and reverse speeds. - The reproducer shall be capable of fast
forward and reverse speeds of approximately ten feet of magnetic tape per second.
3.5.4.7 Foot switch. - A foot switch for reversing and forward playback at nor-
mal speeds shall be included as part of the reproducer with an appropriate length of
control cable.
3.5.4.8 Amplifier. - The amplifier shall have two outputs, one output of 3.2
ohms connected directly to the loudspeaker, and one output of 600 ohms terminating in
ephe headset jack.
3.5.4a.1 Power output. - The 3.2 ohm output shall have a power output of 1
watt. The kolo ohm output shall have a power output of 0.01 watt at a level corres-
ponding to not more than 0.5 watt to the loudspeaker.
3.5.4.9 Loudspeaker. - The loudspeaker shall be an integral part of each re-
producer and shall be designed to provide a means of reproducing a recorded signal of
100 to 10,000 cps.
3.5.4010 Power cable. - A power cable of 10 feet long terminating in a male
plug on one end-1.7177.77;71e receptacle on the other end shall be provided.
3.5.4.11 Power receptacle, - A recessed male line receptacle shall be provided
on the reproducer.
3.5.4.12 Erasing. - The reproducer shall be capable of completely erasing the
recorded information on the medium.
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3.5.4.13 Speed. ? A means shall be provided in the reproducer .for synchronizing
the magnetic tape speed during playback to the prevailing speed during the recording
condition.
3.5;4.14 Playback Capability. - The reproducer shall be provided with means for
playing.back both recorded tracks simultaneously with separate amplifying circuits
for each track or it shall play back one track only as in standard dual track
recording techniques.
4. QUALITY ASSURANCE PROVISIONS
4.1 Acceptance tests. - The equipment shall be subject to acceptance tests to
determine compliance with the requirements of this exhibit. Preliminary acceptance
tests shall be conducted by the contractor at the contractor's plant and witnessed by
authorized representatives of the procuring activity. Final acceptance tests shall
be conducted by Government personnel at Rome Air Development Center, Griffiss Air
Force Base, Rome, New York.
4.2 Previous acceptance or approval. - Previous acceptance or approval of -
material. or release of any design by the procuring activity shall in no case
be
construed as a guarantee of the acceptance of the finished product.
4.3 Prior tests by contractor. - No item, part or complete equipment shall be
submitted to the Government inspector by the contractor until it has been satisfactorily
tested and inspected by the contractor and found to comply, to the best of his
knowledge and belief, with all applicable requirements.
76 4.4 Test Coordination. - The contractor's, procedures and methods of testing
and inspecting the equipment shall be submitted to the procuring activity at least
one month prior to the start of testing.
5. PREPARATION FOR DN.TVERY
5.1 General. - The packaging, packing, and marking requirements specified herein
apply only to direct purchases by, or direct shipments to, the Government, for experi-
mental or development purposes.
5.2 Packaging.and packing. - Packaging and packing for shipment shall be in
accordance with the instructions of the procuring activity.
5.3 Marking. - Each interior package (or container) shall be durably and legibly
marked to identify the contents in such a manner that the markings will'not become.
damaged when the packages are opened.
6. NOTES .
6.1. Additional copies of this exhibit will be furnished only to those Govern-
ment offices and to those bidders that have direct interest in this procurement.-
-6.2 Reference to this exhibit should be by the above title, by the exhibit
:number and contract number, or, if the contract number is not known, by the purchase
request number.
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