MILITARY SPECIFICATION TELEPRINTER, ELECTROGRAPHIC AN/GHM-2(XD-2)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001200090018-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 10
• Document Creation Date: December 22, 2016
• Document Release Date: February 22, 2012
• Sequence Number: 18
• Publication Date: November 22, 1957
• Content Type: MISC

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1VI
22 November 1957
MILITARY SPECI FICATION
TELEPRINTER, ELECTROGRAPHIC AN/GMH-2(XD-2)
;1. SCOPE
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1. 1 Scope -This spec}fication covers a service test model of a high speed,
. electrographic teleprinter capable of serially printing text from 55 alpha-numeric
weather symbol and punctuation characters at asynchronous speeds from 60 to 2, 000
words per minute (wpm). ~,-,:' ~,
2. APPLICABLE DOCUMENTS
2. 1 The.followiilg clocuinents, of the issue in effect on the date of invitation
for bids, form a part of this specification.
SPECIFICATIONS
Military
MIL-E-4158
MIL-E-4970
MIL - D - 5028 "
MIL-P- 17555
Military
Electronic Equipment, Ground;. General
Ii,equirements For
Environmental Testing, Ground Support
Equiprr~ent; General Specifications For
Drawings and Data Lists; Preparation Of
Manuf:zcturers' (For Production Aeronautical
and Associated Equipment)
Preparations .For Delivery of Electronic
Equipment; Miscellaneous Electrical Equip-
ment (Except Rotating Electrical Equipment)
and Associated Repair Parts
MIL -STD - 129 Marking For Shipment and Storage
MIL -STD - 130 Identification Marking of U. S. Military
Property
3. REQUIREMENTS y
3.1 This specification makes provision for first article testing.
3. 2 General specification. -The requirements of MIL-E-4158 apply as
requirements of this specification where practical (3. 3.2. 3). Where the two
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MIL-T-9770 (USAF)
specifications conflict, this specification shall govern. Special attention shall be
given to the interference suppression requirements of MIL-E-4158.
3.3 Design
3. 3. 1 Operation. -The teleprinter shall accept 5 binary digit (bit) serial
teletype code from one of three standard teletype circuits (3. 4. 2, 1) and convert
to 6 bit parallel code. This parallel code shall be decoded to energize 1 of the
55 alpha-numeric weather symbol, or punctuation character lines (3. 4. 2. 2). A
high speed electronic character switch shall determine the sequential operation
of 72 printing heads so that the printing heads shall operate serially, thereby
printing across the page. The printing head shall deposit electrostatic charges
on white plastic coated paper to form the .received character. The paper shall
move through the powdered ink and the ink shall be fixed by a heated roller.
3. 3. 2 Capability for future modifications.
3. 3..2.1 The teleprinter shall be constructed of plug-in units so that, at some
future date, modifications can be made to the unit so that it shall be capable of the
following:
a. Accepting 6 or 8 bit serial oz~ parallel code
b. Operating at any one of the following speeds:
(1)
60 wpm
(5)
750 wpm
(2)
75 wpm
(6)
1000 wpm
(3)
100 wpm
(7)
1250 wpm
(4)
250 wpm
(8)
2000 wpm
3, 3. 2. 2 The unit shall be capable of i7~odification for 50 cps, plus or minus
3 cps operation.
3. 3. 2. 3 Design for production, - I t is anticipated that the production ver-
sion of the teleprinter will meet the requirements of MIL-E-4158, It is the en-
gineering goal of the specification that the service test model specified herein will
permit the production design to be derived from the service test configuration with
a minimum of modification.
3. 3. 3 Electrographic technique. -The electrographic technique for applying
and fixing the ink to the white plastic coated paper shall consist of the following:
a. The printing heads shall deposit electrostatic charges on the paper.
b. The paper shall pass through powc}ered inlc.
c. The print shall be fixed by a heated roller.
d. No other process, and no intermediate process shall be permitted.
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3. 3.4 Solid state devices. -Where practical, solid state circuitry shall be
used. .
3. 3. 5 Electronic switching devices. - No internal mechanical switches, in-
cluding the character switch, shall be permitted. All internal switching units shall
be electronic devices.
3. 3. 6 Distortion. -Using the code specified in 3. 4. 2, the circuit shall meet
the requirements of 3. 3. 1 when the received signals contain as much as 40?fo marking
or spacing bias and as much as 35 percent marking or spacing end distortion.
3.
3. 7
Physical characteristics.
3.
3. 7. 1
The unit shall be a console model, no higher than 37 1 / 2 inches.
3.
3. 8
Operating temperature characteristics.
3. 3. 8. 1 The temperature of the external surfaces of the unit shall not
exceed 125oF'.
3.4 Characteristics of the service test model.
3.4. 1 Power input
a. 105 volts to 125 volts
b. 57 cps to 63 cps
3. 4. 2 Code input
3. 4.2. 1 The input code shall be either 7. 42 or 8 baud, 5 bit serial teletype
code .from one of the following circuits:
a. Standard 20 milliampere teletype circuit at 100 wpm.
b. Standard 60 milliampere teletype circuit at x;.0,4 wpm. ,
c. Bell Dataphone at one of the following speeds:
(1) 750 wpm
(2) 1000 wpm
(3) 2000 wpm i
NOTE: The output of the Bell Dataphone from an impedance of 2200 ohms iS as
follows:
(,1) Mark: 0 volts, plus or minus 2 volts
(2) Space: ~ ~ minus 12 volts, plus or minus 2 volts
3
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MIL-T-9770 (USAF)
3. 4. 2, 2 The 55 characters which the teleprinter shall receive are the
following;
f,. The plus sign and the minus sign
3, 4, 3 Carriage return and line feed, -The teleprinter shall obey the
carriage return signal and the line feed signal when received as a part of the
message (4, 3, 2),
a, The letters A through Z
b. The numbers 0 through 9
c. T~%e-g.~t' - . ~ c~-..~zi~bnls ,~ ,
d. The 4=sk3~=cc~ndltol~syrnb.o.J,s
e. The period, the colon, the apostrophe, the space, and the slant mark.
3. 4, 4 Type and print, -The teleprinter shall be capable of the following
,type and print characteristics:
a. 72 characters per line
b, 5 lines per inch
c. Print shall approximate 10 point type
d. Concealing no more than the first 3 inches of copy in the inker
e. Printing clearly and legibly '
_f, Copy shall be reproducible by the ozalid process or a similar process
g, Handling of copy shall not result in smudging i
h, The inl~ supply shall be great enough to print one full roll of paper
3, 4, 5 Indicators, -The following e:~ternal indicator lights shall be visible
to the operator:
a. Power-on
b. Broken paper or end of paper roll
c. Incoming signal
3.4. 6 Controls, -The teleprinter shall have the following external controls,
easily accessible to the operator:
a. On-off circuit breaker
b. Paper advance button -
3.4. 7 Fuses and interlocks
3.4, 7. 1 The following circuits shall be fused:
a. Heated roller
b, Drive motor
c. Circulation blower
d, Power supplies
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3. 4, 7a 2 An interlock, which will stop the teleprinter if the paper breaks
or the end of roll is reached, shall be provided for the paper roll,
3e 4, 8 Paper
a. At least a 500 foot roll shall be mounted within the unit for ixrsmediate
b. The teleprinter shall be capable of storing at least one spare paper
roll internally,
c, To simplify reloading of paper rolls, the teleprinter shall have the
following features:
( 1) The last 20 feet of paper shall have a green band no less
than 1 / 4 inch wide running along one edge of the paper.
(2) An interlock (3, 4, 7, 2) shall stop the unit when the end of
of the paper roll is reached,
(3) The new roll shall be threaded through the machine and
the operator will attach the beginning of the new roll to.
the end of the used roll and advance the paper (3. 4. 6b).
( 4) No auxiliary paper splicing equipment shall be required
d. The paper drive shall not utilize a sprocl.~et,
e, When actuating the paper advance button (3, 4, 6b), the minimum
paper advance speed shall be 2 inches per second,
3, 5 Environmental conditionsm -The only environmental conditions
that apply are the following:
3. 5, 1 Equipment, nonoperating, -When packaged for overseas shipment
in accordance vrith MIL-P-17555, the equipment shall comply with the operational
requirements of 3. 3, 1 after being subjected to any of the following nonoperatirig
conditions successively or in combinations likely to be encountered during storage
and transit:
ao Temperature, -Continuous exposure in the range of minus 65oF to
plus 160oFo Exposure at the' high temperature will not exceed 4 hours and at the
low temperature will not exceed 24 hourso
b0 Relative humidity, -Relative humidity up to 97 percent for an
indefinite period of time and exposure at 100 percent relative humidity for 4 hours.
The dew point shall not exceed 80?71? o
3. 5, 2 Equipment, operating, - After a warm-up period of_1 hour, the
equipment shall operate in such a way that it will meet or exceed' the minimum
requirements of this specification while being subjected to any of the following
conditions successively or in combinations likely to be encountered during world-
wide operations:
5
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MIL-T-9770 (USAF)
a o Te o perature: Anyo ambient temperatures in the range of plus 32oF to
plus 125 F (0 C to plus 51.7 C),
b, Relative humidity: Relative humidity up to 97 percent for an indefinite
period of time and exposure at 100 percent relative humidity for 4 hours. The dew
point shall not exceed 80oF.
co Low pressure: 22, 58 inches of mercury.
3. 6 Interchangeability, -All parts having the same manufacturer's
part number shall be functionally and dimensionally interchangeable. The drawing
number requirements of MIL-D-5028 shall govern changes in the manufacturer's
part numbers,
3. 7 Identification of product, -Equipment, assemblies, and parts shall
be marked for identification in accordance with MIL-STD-130,
3. 8 Workmanship, -All components shall be constructed in a thoroughly
workmanlike mannerm Particular attention shall be given to freedom from
blemishes and defects; accuracy of dimensions, markings, and freedom of parts
from burrs and sharp edgesa Metal shall form clean, smooth, and unstrained
bends and turns where such shaping is necessary,
30 9 Government loaned property. -When provided for in the contract or
purchase order, the Government will loan a suitable signal source to the contractor,
upon his request (6. 2, 2),
4e QUALITY ASSURANCE Pl~.OVISIONS
4, 1 Classification of tests. -The inspection and testing of the teleprinter
shall be classified as follows:
a.
Acceptance tests (4, 2)
b.
First article tests (4, 5)
40
2
Acceptance tests, -Acceptance tests shall consist of:
ao
Individual tests (4m 2, 1)
4.
2.
1
Individual tests, -Each teleprinter shall be subjected to the following
tests as described under 4. 4, Test methods, of this specification:
a. Examination of product (40 4, 1)
b. Functional tests (4e 4a 2)
4. 3 Test Conditions
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4, 3, 1 Atmospheric conditions, -Unless otllerwise specified, all tests re-
quired by this specification shall be made at an atmospheric pressure of 28 to 32
inches of n;ercury and at a temperature of 25oC, plus or minus lOoC, and a
relative humidity of 30 percent or less,
4, 3, 2 Paper advance at high speed, -For all tests using speeds greater
than 100 wpm, the paper advance shall be accomplished by utilizing a line feed
sibnal and multiple carriage return signals,
4, 4, 1 Examination of product, -Each teleprinter shall be inspected to
determine compliance with this specification with respect to material dimensions,
marking and worklr;anship,
a, Each teleprinter shall be operated for not less than 5 minutes at a code
speed of not less than 1, 000 wpn;, and for not less than 1 hour at a code speed of
not less than 60 wpm, 4
b, The controls of 3, 4., 6 shall be actuated to insure satisfactory operation.
c, The paper interlock (3, 4, 7, 2) shall be manually actuated to insure satis-
factory operation,
d, The indicators of 3, 4, 5 sh~L11 be actuated to insure satisfactory operation.
4, 4, 3 Environmental tests
4, 4, 3, 1 The teleprinter shall be tested for compliance with the requirement
listed below using the following procedure specified in N1IL-E-4970.
Requirement Title of Test Procedure
in MIL-E-4970
Low Pressure Test (3, 5, 2c)
Low pressure test Class A
(Delete portion at 3.44 illches
of mercury)
4, 4, 3. 2 N~easurements and observations shall be made to prove compliance
with 3, 5, 1a, 3, 5, lb, 3, 5, 2a and 3, 5, 2b,
4, 4, 3, 3 The unit shall be operated at the various combinations of con-
ditions specified in 3, 4, and shall meet the requirements of 3. 3. 1.
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NII:1~-'.1.'-0770 (USna~ )
4, 4, ~, 4 I'hc: teleprinter, when operating for the tests of 4. 4. 3, shall
operate at a code speed of not less than 1000 wpm,
4, 4. 4 ll.igl~~ speed tests
4. 4, 4. 1 `1'he tel.cpr?inter? shall be operated by the input code of 3. 4. 2 at
a spccd of not less than 1, 000 wpm for a total of not less than 24 hours.
? 4, 9, 4, 2 Sirrcc tl~,e tests of 4, 4, 3 require the equipment to be operating,
tl~rc durations of the printinl; time in the tests of 4, 4, 3 may be considered a part
of the 2~k hour hi{;~h sl~ecd tests,
4, !l, 4:, 3 n:fter a 30 minute warm-up period, the teleprinter shall be
oper::ttec by the input code of 3, 4, 2 at a speed of not less than 2, 000 wpm for
clot less than 10 r7tirrutcs,
4, 4, 5 Bias and end distortion, - At a code speed of 100 wpm, the unit
shall be actu:a.ted by the code of 3, 4. 2 containing;
:.L, Ids much ::ts 40 percent rn:a.rking~ or spacing' bias.
b, ns niuclt as 35 pc.r?cent rr~a:rlci.ng or spacinb end distortion.
4, 4, 5, 1 Not less than one full page of print shall be required for the test
of 4. 4, 5,
4, 4. G Life test. - [\t a site designated by the procuring activity, a tele-
printer slr:zll be inst:zlleca on :.z GU n~illian~perc, standard teletype line, with a
code spccd o:f 100 wpu~, '1'1re cqu.ipnicnt shall be operated continuously by the
Goverruttc~tt for no .tcss tlt:zn ~~2 d::lys, During the testin period, the teleprinter
shall ope:ratc a.s desc~?ibed in 3. 3..1. 'Total "off" tin~~e shall not exceed 24 hours
per month,
~l, 5. 1 First article test sample. - -The first article test sample shall con-
sist of one model rcp.resentative of the service test model. It shall be tested at a
laboratory designated by the procuring activity or, when so stated in the contract,
iit the contr.ictor's plant tinder the supervision of the procuring activity.
4. ~. 2 First article tests, -First article tests shall consist of all tests
described under 4, =1, '1 est methods.
:5, I'F~EPAR~TIONS FOR DELIVERY
5, 1 Preservation, packaging, and packing, -Preservation, packaging,
and paclciiig shall be as specified in AlIIL-P-17555.
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5. 2 Marking for shipment. -Interior packages and e;;terior shipping con-
tainers shall be marked in accordance with MIL-STD-12,9, The shipment marking
nomenclature shall be as follows: Teleprinter, Electrographic AN/Gl~'IH-2( XD-2).
6. 1 Use. -The Teleprinter, Electrographic AN/GMH-2(XD-2) covered by
this specification is intended to print at speeds up to 2, 000 viords per minute. It
shall be capable of serially printing text from 55 alpha-numeric and weather
characters. An electrographic printing technique is used, no moving carriages
are employed, and the unit is essentially noiseless when operating,
6.2.1 Ordering data, -Procurement documents should specify the following:
6.2 Title, number, and date of specification,
6. 2. 2 The type of signal source to be provided to the contractor upon his
request (3. 9).
6. 2. 3 Level of preservation, packaging, and packing desired.
6.3 First article sample. - It is expected that the contract or purchase
order will specify that one set will be required as a first article sample and that
this sample will be subjected to the first article tests to determine compliance with
the requirements of this specification, ~.Che invitation for bids and the contract
should specify the point of inspection for these tests,
NOTICE: When government drawings, specifications, or other data are used for
any purpose other than in connection witl-i a definitely related Government procure-
ment operation, the United States Government thereby incurs no responsibility nor
any obligation whatsoever; and the fact that the Government may have formulated,
furnished, or in any way supplied the said dr~awing~s, specifications, or other data
is not to be regarded by implication or otherwise as in any manner licensing the
holder or any other person or corporation, or conveying any rights or permission
to manufacture, use, or sell any patented invention that may in any way be related
JLM /cot
CRZDP
PREP1~lRING ACTIVITY
AFCRC
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3. 3, 8, 1 ADD: The temperature of the external surfaces of the unit shall not exceed
125 F or 30 F above arr;bient, whichever is higher.
3, 5, 1 ADD: the equipment shall, after being unpacked for at least
one hour, comply with
3. 50 1 (a) CHANGE: 1G0 F to 150 F<
4. 4a 2 (a) ADD: Not more than , 0025% error will be allowed in the printed copy.
Errors are defined as those printed characters which do not conform to the in-
coming data, and those characters which are not legible.
4, 4, 4, 1 ADD: The 24 hour period need not be continuous; however, no maintenance,
other than normal additions of supplies, will be allowed during the course of the'
test, Not more than .0025% error, as defined under 4. 4.2 (a), will be allowed in
the printed copy,
4, 4, 4, 3 ADD: Not more .than .0025% error, as defined under 4.4. 2 (a), will be
allowed in the printed copya _
4, 4, 5, 1 ADD: A page is defined as (50) lines of single-spaced copy.
4, 4, 6 CHANGE LAST LINE TO READ: Total down time for malfunction of the
machine shall not exceed (24) hours in and calendar month. Paper and ink loading
time shall be included in the (42) day period, and not as part of the (24) hour down
time, Not more than , 0025% error, as defined under 4, 4. 2 (a), will be allowed
in the printed copya
G, 1 CHANGE LAST SENTENCE TO READ: An electrographic printing technique
is used, no rr;oving carriabes are employed, and the unit will not produce objection-
able noise when used in an office space,
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