1、MIL-T-28957A (W) 3 December 197.0 SUPERSEDIZX; MIL-T-28957 (MC) 6 August 1970 MILITARY SPECIFICATION TELETYPEWRITER SET: AN/TGC-29(V) - Paper, Teletypewriter, Roll, - Paper, Teletypewriter, Roll, for Spirit Process Duplication. - Tape, Teletypewriter, Perforator, - Ribbons, Teletypewriter. Provided
2、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDS MILITARY MIL-Sl?D-l08 - Definitions of and Basic Requirements for Enclosures for Electric and Electronic Equipment. MIL-STD-167 - Mechanical Vibratins of Shipboard Equipment . MIL-STD-188 - Military Co
3、mmunications System Technical Standards. MIL-STD-661 - Electromagnetic Interference Characteristics Requirements for Equipment. MIL-STD-462 - Electromagnetic Interference Characteristics Measurement pf. MIL-STD-463 - Definition and System of Unies, Electromagnetic Interference Techno,ogy. MIL-STD-81
4、0 - Environmental Test Methods. (Copies of specifications and standards required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 3. REQUIREMENTS *3.1 First article . Unless otherwise specified (
5、see 6.2), the contractor shall furnish two first articles for testing under the direction and supervision of the cognizant Government inspector to determine conformance to-this specification. First article is defined as a teletypewriter set which will be identical to the production units which the c
6、ontractor will subsequently produce in fulfillment ofthe contract. Approval of the first articles by the activity concerned shall not relieve the contractor of the responsibility to supply teletypewriter sets conforming to this specification. Examination and testing shall be as specified herein. Any
7、 changes or deviations of khe*.production units from the first articles shall be subject to the approval of the contracting officer. The Eirst articles may be included in the final, shipment as part of the total quantity to be supplied under the contract, provided they have been completely refurbish
8、ed. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-28957A 58 m 797970b 0156239 B W 3.2 Parts and materials. In the selection of parts and materials, fulfillment of major design objectives shall be the prime consideration. In all cases, general
9、 matercial requirements as to nonflammability, fungus resistance, and nontoxicity as required by MIL-E-16400 must be met. In doing so, the following factors shall govern: 3.2.1 Electronic components. Parts and materials listed in MIL-E-16400 shall be given first consideration, When use of parts or m
10、aterials in accordance with MIL-E-16400 will not fulfill the design objective because of size, weight, performance, or other reasons, the use of other materials may take precedence, with the approval of the contracting officer. 3.2.2 Mechanical components. MIL-E-16400 shall be complied with, wheneve
11、r possible, without sacrifice of the design objectives of size, weight, performance, reliability and ease of maintenance. Where mechanical parts whose function is to rotate, oscillate or cam against others are employed, and best choice of materials comprises materials other than those listed in MIL-
12、E-16400, use of those materials may take precedence, with the approval of the contracting officer, provided that maximum life is achieved by use of lubricating agents, protective paints or sprays or other methods. 3.2.3 Moisture and funqus treatment. The teletypewriter set shall be fungusproofed by
13、selection of parts and materials which are nonnutrient for fungus or by treatment of the parts and materials prior to their use in the teletypewriter set so that overall spraying of the teletypewriter set is not necessary. JC3.3 Desiqn and construction. The teletyp,ewriter set described herein is a
14、man-transportable, self-contained message preparation unit capable of originating, trans- mitting or receiving teletype messages between two or more points. The equipment shall be complete, except for transmission media (such as wires or frequency-shift keying units) and primary power source. The fo
15、llowing components are integral parts of the teletypewriter set: (a) TT-548/TGC-29 (V) # Teleprinter (b) TT-541/TC-29 (V) I Reperforator, Teletypewriter 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-28957A (Mc) (c) TT-542BGC-29 (V) , Keyboa
16、rd-Transmitter, Teletypewriter (d) TT-543/TGC-29 (VI , Distributor-Transmitter, Teletypewriter (e) CH-47 2/UG, Chassis, Reperforator, Teletypewriter (E) CH-471/UG, Chassis, Teleprinter (9) CW-932/TGC-29 (V) , Cover, Reperforator, (h) CWU933/TC-29 (V) , Cover, Teleprinter (5) Teletypewriter CY-6274/T
17、GC-29 (V) 8 Case, Teletypewriter (Tactical) or CYn6275/TC-29 (v) 8 Case, Teletypewriter (Non-Tactical) (j ) PDm83/U, Motor, Alternating Current (400 Hz) or PD-82/U8 Motor, Alternating Current (60 Hi) (k) C-7737/TC29 (v) 8 Control, Electronics -Teletypewriter The teletypewriter set shall be capable o
18、f operation on 115 alternating current volts (Vac) either 60 or 400 hertz (Hz),single phase power simply by changing two motors. set shall transmit and receive 70 unit, five level, serial Baudot code, and shall be capable of operation over radio or wire channels. Circuits shall be either two half du
19、plex (simplex) or one full duplex, or each individual component may be brought out separately through an options connector. All connections shall be made throgh the connectors or binding posts at the rear of the teletypewriter set. The teletypewriter set shall operate on-line in signal lines ranging
20、 . 1.I. . . in value of 2.5 milliamperes !( and 60 mA in external current modes as specified in 3.3.4. shall be capable of keying external line currents of 80 micro-amperes (UA) at 2 direct-current volts (Vdc). The distributor-transmitter shall be capable of receiving a stepping control pulse from a
21、n external source (dry contacts). The battery for this pulse shall be furnished either from the teletypewriter set or an external source. At least four teletypewriter sets, prc-29 (VI # shall be capable of The The keyboard and distributor-transmitter Provided by IHSNot for ResaleNo reproduction or n
22、etworking permitted without license from IHS-,-,-MIL-T-28957A 5 799990b OL5b2YL b M MIL-T-28947A (MC) operating on the same signal line with one teletypewriter set, AN/TGC-29(V) 8 supplying the line battery. The tele- typewriter set shall be capable of operating in the external modes as specified-in
23、 Table I. 16 are tlmirror-imagesii of options 1 througl 8, and may be provided by means of a reversing switch or other method. Changing from one mode to another shall be accomplished by an operator in a matter of minutes without the use of tools other than those supplied as part of the teletypewrite
24、r set. data. 50 and 75 bauds by use of speed gears included as part of the basic equipment. options are to be assigned for differentiation between illocalil and l1remoter1 signal line battery supplies. Circuit wiring instructions shall contain information as to whether the two signal line battery su
25、pply switches are to be set for the ltlocallt or liremoteil positions. Table I - On-line modes OpEions 9 through Each teletypewriter set shall contain option patching Operational speeds shall be variable between 45. 458 To simplify option patching data, no OPTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
26、16 LINE 1 B8 c8 D B8 c A B C D c8 B8 c8 B, c B8 c8 B8 D LINE 2 D c8 B8 c8 D B8 B8 A, c8 B8 A, B8 c8 A B C A= Page Printer, B= Printing Reperforator, C= Keyboard, D= Distributor-Transmitter. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3,l Auxi
27、liary modes. To provide for operation under conditions not falling into any of the options listed in Table I, the page printer, printing reperforator, keyboard, distributor-transmitter, and each of the two internal signal line power supplies shall be brought out to separate pins in one or more of th
28、e service connectors. *3.3.2 Internal operation. The options in Table I apply to llexternalll operation only. The teletypewriter set shall also provide for flinternall operation, which is to be accomplished by positioning one switch for each of the four major components listed in Table I regardless
29、of the llexternalll option patched for that particular unit. ltInternallfi operation shall be conducted at low level signals not to exceed 5 mA. for the crypto I!sendt1 and llreceive“ lines. The crypto clutch pulse may be connected to the standard clutch pulse pins, provided that It floating“ (nongr
30、ounded) shielding is provided. 3.3.3 Crypt0 lines. Separate connectors shall be used *3.3.4 External current modes. External current modes shall be as follows: (a) Position 1. Operation in circuits where the ilmarkll current is nominally 20 mA 23 percent and the “spacef current is between O and 0.5
31、mA. Transition rom llmarkll to llspaceJ shall occur between 12 mA minimum and 8 mA maximum. IlSpaceIl to l1markl1 transition shall occur between 8 mA minimum and 12 mA maximum. All testing shall be performed in a 20-mA steady llmarkl loop. (b) Position 2. Operation in circuits where the ltmarklf cur
32、rent is nominally 60 mA 23 percent and the I1spacelt current is between O and 0.5 mA. Transition from llmarkll to flspacelf shall occur between 32.mA maximum and 28 mA minimum. l1Spacet1 to flmarkll transition shall occur between 28 mA maximum and 32 mA minimum. All testing shall be performed in a 6
33、0-mA steady glmarklt loop. (c) Position 3. Operation in circuits where l1rnarklt current may be anywhere between 2.5 and 10 mA, and “spaceIt current will be between O and 0.5 mA. Accordingly, trans- tions in either direction shall take place between 0.5 and 2,5 mA, and all testing shall be performed
34、 in a 2.5-mA steady flmarklf Loop. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-28957A 58 m 9999906 0356243 T W MIL-T-28957A (MC) (d) Position 4. Operation in circuits where Ilmark“ current may be anywhere between 20 and 80 mA, and Ilspace“
35、leakage current may vary from O to a high leakage condition of 12 mA. Transition from llmarktl to llspacell shall occur at 19 mA maximum and 13 mA minimum. “Space“ to lrmarkll transition shall occur between 13 mA maximum and 19 mA minimum. All testing shall be performed in a 20-mA steady timarklf lo
36、op. 3.3.5 Cases. The teletypewriter set shall be mounted in a rugged, watertight, transit case, CY-6274/TGC-29 (V) , Case, Teletypewriter (Tactical) or CY-6275/TGC-29 (V) , Case, Teletypewriter (Non-Tactical) as specified in the contract or order (see 6.2) . The case shall be designed to fasten toge
37、ther (front-half and rear-half) to form a watertight unit. The rear half shall contain two chassis on individual roller slides, so that the two chassis may be pulled out one at a time for replacement of-pape? rolls and ribbons, changing speed, and maintenance. Postive acting locks for the chassis sl
38、ides shall be provided, which may be released, to permit slide extension, chassis removal and installation without the use of tools. Removal of all or part of the front cover to pull out the chassis is permissible, providing the front cover may be removed without the use of tools. The case shall be
39、provided with appropriate carrying handles mounted above the center of gravity. The case shall be constructed so that positioning of the keyboard and insertion of the service cables and chad box shall be all that is required to place the teletypewriter set in operation. The keyboard shall be capable
40、 of being positioned in a send or stowed position, or removed completely without the use of tools. Internal construction shall provide for flow of heating and cooling air. All major components shall be mounted so as to permit quick removal for repair or replacement. Termination of the high and low l
41、evel signal, radio control and earth grounding lines shall be by means of binding posts mounted on the rear terminal apron. The rear terminal apron shall have a watertight cover. Parallel inputs for these binding posts shall be by means of pins in one or more quick disconnect type connectors. Crypto
42、 signal lines shall terminate in separate connectors for the “send“ and tlreceiveli lines. The crypto clutch pulse may be connected to the standard clutch pulse pins. The bottom of the case shall be provided with metal inserts capable of accepting a 1/4 inch by 20 machine screw. Mounting shall norma
43、lly be 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-made by inserting the screw through a shelf and into the inserts. Shock isolators may be utilized if desired, or bumpers o? rubber, plastic or other suitable material may be provided. In the tr
44、ansit condition, with all ports closed, and with the front-half secured to the rear-half of the case, the teletypewriter shall be watertight in accordance with MIL-STD-108. of the rear terminal apron port is permissible to make any electrical connections to the equipment. Stowage space shall be prov
45、ided for the three service cables, three sets of spare fuses, spare lamps, wrench, five feed roll pins and ten sprocket teeth for the platen of the teleprinter, chad box, and any special tools furnished as part o? the teletypewriter set. It shall be possible to separate the front-half from the rear-
46、half Of the case and remove the material stowed therein without the use of tools. Removal 3.3. 1 Case, Teletypewriter (Tactical) CY-6274/TC-29 (V) . Provisions shall be made to convert the front-half of the case to an operator seat by means of legs which shall fold into the front-half of the case fo
47、r stowage. Height shall be adjustable between 15 and 22 inches. The seat thus formed shall support without delormation a seated man weighing 250 pounds, Additionally, provisions shall be made to convert: the rear-half of the case to a console by means of legs. These legs shall fold and stow into rec
48、esses on the outside of the case, and shall be affixed to the rearuhalf of the case without the use of tools, other than those self-contained. With the legs locked in the operating position, the top center row of keys on the keyboard shall bp between 20 and 30 inches from dhe ground, and the entire
49、rear-half of the case shall then be capable of supporting 75 pounds, in addition to the weight of the teleprinter set. *3.3.5.2 Case, Teletypewriter (Non-Tactical) CY-62751TGC-29 (V) . The nontactical case shall be similar to the tactical case, except that the folding legs (and attaching hardware) and rear access door shall be eliminated. The case shall be furnished with one matching connector for each connector used in.lieu o
