1、MIL-T-AS13A SA 7777706 01730Li3 9 MIL-T-85138( AS) iI 19 September 1979 MIL ITARY SPEC1 FICATION TRANSMITTER, PULSE-CODE MODULATION (FOR SECURE TELEMETRY APPLICATIONS) This specification is approved for use by Naval Air Systems Com- mand, Department of the Navy, and is available for use by all Depar
2、tments and Agencies of the Department of Defense. 1. SCOPE. 1.1 Scope. Th s specificat requi rement s for a pul se-code transmitter, referred to here 2. APPLICABLE DOCUMENTS. on defines the performance and test modulation (PCM) airborne telemetry n as the transmitter. 2.1 Issues of documents. The fo
3、llowing documents of the issue in effect on date of invitation for bids or request for proposal form a part of this specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-T-18303 Test Procedures; Preproduction Acceptance, and Life, for Aircraft Electronic Equipment, Format for. Be
4、neficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commanding Officer, Naval Air Engineering Center, Engineering Specifications and Standards Department (ESSD) Code 93, Lakehurst, New Jersey 08733, b
5、y using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. I I FSC 5821 0- - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL -STD-462 Sampling Procedures and Tables
6、for I ns pec t i on by Attribut es. Quality Assurance Terms and Definitions. Marking for Shipment and Storage. Identification Marking of US Mi 1 itary Property. Standards and Speci fications, Order of Precedence for the Sel ection of. Standard General Requi rements for El ect ronic Equi pent. Electr
7、omagnetic Interference Characteri stics, Requi rements for Equi pment. Electromagnetic Interference Characteristics, Measurement of. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-85338 58 9797906 0373845 2 M MIL-T-85 138( AS) MIL-STD-810 Envi
8、ronmental Test Methods. MIL -STD-1472 MIL-STD-1695 Human Engineering Design Criteria for Military Systems, Equipnent and Facilities. Environments, Working, Minimum Standards for. (Copies of specifications, standards , and pub1 ications required by contractors in connection with specific procurement
9、functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless other- wise indicatd, the issue in effect on date of invitation for bids or re
10、quest for proposal shall apply. FEDERAL CATALOGING HANDBOOK H4 Federal Supply Code for Manufac- turers, Unites States and Canada. (Application for copies s.hould be addressed to the Superintendent of Documents, Government Printing Office, Washington, DC 20402.) Inter-range Instrumentation Group (IRI
11、G) Range Commanders Council (Code Ident 29669) Document 106 Tel emetry Standards. Document 118 Test Methods for Telemetry Systems and Subsystems. (Application for copies should be addressed to the Secretariat, Range Commanders Council , White Sands Missile Range, NM 88002.) . 3. REQU IREMENTS. 3.1 I
12、tem definition. The itern described herein is a miniature telemetry transmitter operating in the L-band (1435-1535 megahertz (MHz) or S-band (2200-2300 MHz) microwave frequencies al located for such use. The transmitter operates on the normal aircraft or missile 28-volt direct current (Vdc) power su
13、pply. Since the 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 MIL -T-85 1 38 ( AS) transmitter is normal ly used on unmanned test equipment which includes missiles, bombs, and pilotless aircraft used as targets, the transmitter is normally dest
14、royed in use. Input to the transmitter wi 11 be nonreturn-to-zero (NRZ) PCM data, at rates from 10,000 to 2,000,000 bits per second. 3.2 C haracteri sti cs. 3.2.1 Performance requirements. The transmitter, while mounted on a heat sink which simulates the subassembly mounting plate (see figure 1), sh
15、all meet the performance requirements specified herein with or without modulation by PCM signals in accordance with IRIG Document 106. 3.2.1.1 Input voltage and current. The transmitter shall operate over the voltage range of 22 and 34 Vdc. Unless otherwise specified in the contract or purchase orde
16、r (see 6.2.1), maximum current consumption shall be 0.800 ampere (A) at all temperatures. 3.2.1.2 Signal input impedance. Signal input impedance shall be 75 ohms shunted by 50 picofarad maximum capacitance. 3.2.1.3 Overvoltage and power reversal. The transmitter shall not be damaged by an input volt
17、age of +40 Vdc or a power polarity reversal for 3 minutes. 3.2.1.5 On-off lead. An external lead shall be provided that will cause the transmitter to operate only when the lead is con- nected to power ground. 3.2.1.6 Operating frequency. Operation shall be within the ultra high frequency telemetry b
18、ands from 2,200 to 2,300 MHz or 1,435 to 1,535 MHz. Unless otherwise specified in the contract or purchase order (see 6.2 .l) , center frequency to1 erance chal 1 be kO.003 percent of the specified frequency with or without modula- tion. The operating frequency range will be specified in the contrac
19、t or purchase order (see 6.2 .i) . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2.1.7 Frequency deviation range. Unless otherwise specified in the contract or purchase order, the transmitter shall be capa- ble of a peak-to-peak deviation of 11 M
20、Hz (see 6.2.1). 3.2.1.8 Input characteri stics. 3.2.1.8.1 Modulation frequency response. The modulation frequency response shall be within +2 decibels (dB) of the response at 10 kilohertz (kHz), for deviations to and including the maximum deviation, at frequencies from zero to 1 MHz, and within 13 d
21、B from 1 MHz to 1.5 MHz. 3.2.1.8.2 Deviation sensitivity. Unless otherwise specified in the contract or purchase order (see 6.2.1), deviation sensitivity from zero to 1 MHz shall be between 325 and 375 kHz per Vdc. A positive voltage shall cause an increase in frequency. shall not exceed 1.5 kHz roo
22、t-mean-square (RMS) when tested with a receiver with 500 kHz intermediate frequency (IF) bandwidth and 200 kHz output filters, where RMS frequency is one standard deviation from center frequency in gaussian noise. The receiver functions as a frequency-to-voltage converter. If desired, the receiver m
23、ay be assembled using a stable oscillator, double- bal anced mi xer and frequency demodul ator. Receiver 1 oca1 osc i 1 - lator frequency instabil ity produces measurement system IFM. 3.2.1.10 Signal-induced incidental amp1 itude modulation (IAM). IAM shall not cause a peak-to-peak voltage excursion
24、 exceeding 3 percent of the carrier average voltage for any modulating frequency at any deviation up to and including maximum. 3.2.1.9 Incidental frequency modulation (IFM) . IFM (see 6.3.1) 3-2.1.11 Output power. Unless otherwise specified in the contract or purchase order (see 6.2,1), the transmit
25、ter power output, with a 24 Vdc input, shall be 2 W minimum into a 50-ohm resi stive 1 oad at any combination of electrical and envi ronmental conditions. Power output shall be 1.5 W minimum at 22 Vdc under the same conditions. 3.2.1.12 Output impedance. During operation, transmitter output impedanc
26、e shall be 50 ohms with a return loss not exceeding 10 dB. 3.2.1.13 Output load mismatch. When operating into an open or short circuit, the transmitter shall not be damaged nor its 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-85 138( AS) o
27、peration impaired except for reduced power out put. Thi s mismatch applies to all load phase angles. Power so reflected shall be dissipated in an isolating device integral to the transmitter. 3.2.1.14 Electromagnetic interference (EMI). The generation of EM1 by the transmitter and the vulnerability
28、of the transmitter to EM1 shall be within the limits of MIL-STD-461, equipnent Class IB, except as specified below (see 3.3.2). 3.2.1.14.1 Antenna terminal conducted emission. All spurious and harmonica1 ly-related outputs over the frequency range of 150 kHz to 10 gigahertz (GHz), measured in the tr
29、ansmission line between the transmitter output and load, shall be at least 60 dB down in power from the carrier power level when tested in accord- ance with MIL-STD-462, Test Method CE06, and with voltage standing-wave ratios up to and including 1.5:l at all phase 3.2.1.14.2 Electric field radiated
30、emission. Radiated emissions over the frequency range of 14 kHz to 10 GHz shall be within the limits of MIL-STD-461, Test Method RE02, except that narrowband emission over the range of 500 kHz to 10 GHz may exceed the limits of MIL-STD-461, figure 21, by no more than 35 dB. peak-to-peak output frequ
31、ency deviation versus input modul ati ng voltage shall be linear within 2 percent of bandwidth for 41.0 MHz deviation. Linearity chal 1 be measured from the best straight 1 ine as determined by the least squares method. 3.2.1.16 Tilt. The tilt (the amount of rise or droop from horizontal lwercent 1
32、eve1 measured in percent per microsecond (us) evidenced by the output response, shall not exceed 0.1 percent per us at either test frequency specified in 4.5.14. 3.2.1.17 Power-supply induced frequency modulation. Power- supply induced frequency modulation shall be no greater than the limit specifie
33、d in the contract or purchase order (see 6.2.1). supply induced amplitude modulation shall be no greater than the limit specified in the contract or purchase order (see 6.2.1). 3.2.1.15 Deviation linearity. The characteristic curve of 3.2.1.18 Power-supply induced amplitude modulation. Power- 6 Prov
34、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2.1.19 Isolated power ground. When specified in the contract or purchase order (see 6.2.1), the transmitter shall be provided with a power supply ground isolated from the case and radio- frequency ground
35、by a resistance of greater than 1 megohm (case and radio-frequency ground may be common to each other). Isolation breakdown voltage shall be greater than 50 volts (V) in either polarity. 3.2.1.20 Differential modulation input. When specified in the contract or purchase order (see 6.2.1), the transmi
36、tter shall be provided with a differential modulation input such that common- mode signals are suppressed by a minimum of 60 dB up to 500 Hertz (Hz), and a minimum of 40 dB from 500 Hz to 10 kHz. The negative modulation input lead shall be connected to the shield of the modulation input connector, a
37、nd the modulation input shall have a common-mode withstanding voltage of +lo V. 3.2.1.21 Spike. The transmitter shall not be damaged by a power-line, over-voltage spike of amplitude up to 60 V (including normal power supply voltage) and duration up to 100 milliseconds (ms) 3.2.2 Physical characteri
38、stics. 3.2.2.1 Conformance to documents. Unless otherwise specified in the contract or purchase order (see 6.2.1), the transmitter shall conform to figure 2, and shall meet all of the requirements of this specification and the documents referenced to the extent specified herein. avai 1 able on the t
39、ransmitter. 3.2.2.2 External adjustments. No external adjustments shall be 3.2.2.3 1 pound. 3.2.2.4 mai ntai ned Weight. The transmitter shall weigh no more than Basepl ate flatness. Baseplate flatness shall be within 0.010 inch overall. 3.2.3 Reliability. 3.2.3.1 Shelf life. The transmitter shall b
40、e designed to meet the performance requirements specified herein after a storage period of up to 5 years. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M IL - T-85 138 ( AS 1 3.2.3.2 Life. The transmitter shall have a total operating life of 200
41、hours minimum continuous or intermittent duty without necessity for any repair, replacement, or adjustment. 3.2.4 Maintainability. Units made to this specification are not required to be fi el d-mai ntai nab1 e. 3.2.5 Environmental conditions. The transmitter shall meet all requirements specified he
42、rein before, during, and after exposure to the following environmental conditions or any natural combinations thereof. equivalent to 110,000 feet altitude at a temperature of -4OOC. -54OC. to -4OOC. 3.2.5.1 Temperature-al ti tude. Reduced barometric pressure 3.2.5.2 Storage temperature. Temperatures
43、 ranging from t85 to 3.2.5.3 Operating temperatures. Temperatures ranging from t85 3.2.5.4 Temperature shock. Transitions within 5 minutes from temperature stabilization .at +85 and -40C to an environment stabilized at the opposite temperature extreme. 3.2.5.5 Humidity. Atmosphere containing 85 perc
44、ent or greater relative humidity, at temperatures from 728 to +71“C. 3.2.5.6 Vibration. Levels of sinusoidal vibration up to and including 15 gravity units (g), or 0.06 inch double amplitude , over a frequency spectrum from 50 to on as specified in figure 3 in three 100 g acceleration sawtooth pul s
45、es all axes and in any direction. 3.2.5.8 Burn-in and screening. Each transmitter shall be subjected to a minimum of 6 cycles of burn-in and screening as shown in figure 4. excursion, whichever is les 2,000 Hz, and random vibrat mutual ly perpendicul ar axes 3.2.5.7 Shock. Levels of with a durationo
46、f 6 ms, in 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3 Design and construction. 3.3.1 Materials. All materials used in the construction of the transmitter shall be in accordance with MIL-STD-454, Require- ment 3, Flammable Materials; Requir
47、ement 4, Fungus-Inert Mater- ial s; Requi rement 15, Ferrous Al 1 oys, Corrosion Resi stance; and Requirement 16 , Di ssimi 1 ar Metal s. 3.3.2 Electromagnetic radiation. Unless this requirement is waived in writing by the contracting officer (see 6.2.11, a representative transmitter shall be tested
48、 to MIL-STD-461 for electromagnetic emissions. Tests required are procedures CEO1, CE02, CE03, CE04, CE05, CE06, RE02, and RE03. Testing of elec- tromagnetic suscepti bi 1 i ty is not requi red. When specified in the contract or purchase order, the results of these tests shall be provided wi th each
49、 preproduction 1 ot ( see 6.2.2 1. 3.3.3 Identification and marking. The transmitter shall be identified and marked in accordance with MIL-STD-130 and figure 2. Markings shall include, but shall not be limited to, the following: (a) The number and revision of this specification, MIL-T-85138( AS). (b) NAVAIR code identification number, 30003. (c) Manufacturers name and symbol or code identifica- tion from Federal Cat
