NAVY MIL-M-18550-1956 METER FREQUENCY RF LM SERIES《LM系列频率特性曲线》.pdf

1、MI L-M-18550 (AER) I MAY 1956 Supersedes 17M24(Aer) Dtd 15 April 1948 MILITARY SPECIFICATION METER, FREQUENCY, RF, LM SERIES This specification has been approved by the Bureau of Aeronautics, Department of the Navy 1. SCOPE AND CLASSIFICATION 1.1 ScoDe - The equipment covered by this specification s

2、hail be a Meter, Frequency, RF, LM Series, capable of providing a simple, accurate, and reliable frequency indicating equipment of the crystal calibrated type for use in Military Service. It shall be adaptable for adjusting adjacent radio transmitters and receivers to any desired frequency in the ra

3、nge from 125 to 20,000 kc. 1.2 Classification - The Meter, Frequency, RF, LM Series shali be of four types and shall vary in different models as stated below: Type 1 (Equivalent to Model LM-13 and 17) Self Contained, Battery Operated Nomenclature Equipment Heterodyne Frequency Meter Frequency Meter

4、Mount- ing Base Calibration Book (typed) Carrying Case with Bat- tery Compartment WaterprQof Canvas Cover Type Description Navy Type-74028 Navy Type-10121 Navy Type-10111 Navy Type-10110 Max Allow. Size Max Allow. (in.) Wt Per Unit L/D I H (lb) W 8- 1/2 7 I I I Type II (Equivalent to Model LM-10 and

5、 14) A-C Operated (Power Supply not Furnished) i 8-1/8 I 8-7/16 7-7/8 i-1/2 1 Max Allow. Size Description Nomenclature Equipment Heterodyne Frequency 1 Navy Type-74028 I 8-1/2 1 8-1/8 I 8-7/16 1 Meter 1 Frequency Meter Mount- Navy Type-10121 7 7-7/8 i-1/2 ing Base . 1 Shielded Power Cable 108 1 Cali

6、bration Book (typed) 1 Waterproof Canvas Cover 11.5 0.5 0.25 9.75 4.0 Wt Per Unit 0.25 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- M- 185 5 O (Aer) Type III (Equivalent to Model LM-11, 15, and 18) A-C Operation with Rectifier Unit Wan Per

7、Equipment 1 1 1 1 1 *1 1 Quan Per Equipment 1 1 1 1 1 Nomenclature Heterodyne Frequency Meter Frequency Meter Mount- ing Base Rectifier Power Unit Rectifier Unit Mounting Base AC Input Cable Shielded Power Cable Calibration Book (typed) Type Description Navy Type-74028 Navy Type-10121 PP-l06/U Navy

8、Type-10120 Max Allow. Size W 8- 1/2 7 14 7- 7/8 8- 1/8 7- 7/8 10- 1/4 8- 7/16 72 108 (Equivalent to Model LM-12, 16, and 19) A-C Operated (Power Supply not Furnished) H 8-7/16 i-1/2 7-3/4 11/16 Max Allow, Size Description Nomenclature I I I Heterodyne Frequency I Navy Type-74028 I 8-1/2 I 8-1/8 Mete

9、r Frequency Meter Mount- ing Base Shielded Power Cable Waterproof Carrying Case Calibration Book (typed) Navy Type-10121 7 7- 7/8 Navy Type-10086 9-5/16 10-9/16 108 I I H 8- 7/16 1- 1/2 11-?/8 Max Allow, Wt Per Unit (lb) 11.5 0.5 13.6 0.5 1.5 1.93 0.25 Max Allow, Wt Per Unit 11.5 0.5 1.93 8.0 0.25 2

10、. APPLICABLE DOCUMENTS 2.1 General - The following documents of the issue in effect on the date of invitation for bids, shall form a part of this specification to the extent specified herein: 2.2 Specifications: Militar y MIL- T- 27 MIL-T-945 MIL-1-6181 Transformers and Inductors (Audio, Power, and

11、Puise) Test Equipment, For Use With Electronic Equipment; General Specification Interference Limits and Tests; Aircraft Electrical and Electronic Equipment JAN- C- 62 Capacitors, hy-Electrolytic, Polarized JAN-P- 65 8 MIL-%- 7078 Packaging and Packing of Electrical Equipment and Spare Parts (Electro

12、nic, Electrical, and Electromechanical) Cable, Power, Electrical, Copper, Shielded, Aircraft, 69O-VOlt. _ _-1- 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-M-LB550 66 m 7777706 0327745 7 m MIL-E-5400 MIL-E-4682 MIL-N-18307 Standards . MIL-M

13、-l8550(Aer) Electronic Equipment, Airborne, % General Specification for Electron Tubes, Choice and Application of Nomenclature and Nameplates for Airborne Electronic and Associated Equipment NIIL.-STD- 129 Availability of Applicable Documents: (1) When requesting specifications, standards, and drawi

14、ngs, refer to both title and num- ber. AU requests should be made via the cognizant Inspector of Naval Material or Bureau of Aeronautics Representative. (2) Copies of this specification and applicable specifications and publications may be ob- tained upon application to the Commandg Officer, Naval A

15、viation hpply Depot, Philadlphia 11, Pennsylvania. Attention: Code ODPT. Marking for Shipment and Storage 2 .,3 I 2.4 Precedence - When the requirements of the contract, this specification, or applicable suh- sidiary specification are in conflict, the following precedence shall apply. (1) Contract -

16、 The contract shall have precedence over any specification. (2) This Specification - This specification shall have precedence over all subsidiary spec- ifications. Any deviation from this specification, or from subsidiary specifications where applicable, shall be specifically approved in writing by

17、the procuring agency. (3) Referenced Specifications - Any referenced specifications shall have precedence over all applicable subsidiary specifications referenced therein. All referenced specifica- tions shall apply to the extent specified. 3. REQUIREMENTS 3.1 Parts and Materials - The equipment sha

18、li fulfill the following requirements for parts and materials: 3.1. I Selection of Parts and Materials - The fulfillment of major design objectives shall govern the selection of parts and materials. All parts and materials shall meet the requirements of Specification MIL-E-54OO;however, if the contr

19、actor can demonstrate the use of such parts and materials will not fulfill the major design objectives, then parts and materials shall be used which most nearly meet or exceed the re- quirements of Specification MIL-E-5400. 3.1.2 Approval for Nonstandard Parts and Materials - Approval for the use of

20、 nonstandard parts and materials shall be obtained as outlined in Specification MIGE5400. Requests for approval must be for- warded to the procuring agency by the contractor before parts are purchased or fabricated. the requirements of Specification MIL-T-945. 3.1.3 Workmanship - Workmanship, fabric

21、ation, and manufacturing processes shall conform to Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M- 18550(Aer) 3.1.4 Transformers, Inductors, and Capacitors - The use of open-type transformers and induc- tors will be acceptable if such units a

22、re protected by encapsulating material approved by the procuring agen- cy. The Grade 2 requirements of Specification MIL-T-27 shall apply to the open-type units only to the extent that these requirements be fulfilled by the Flexseal, Fosterite, and Permafil processes, or equivalent. Elec- trolytic c

23、apacitors may be used if they meet the requirements of Specification JAN-C-62. the requirements of Specification MIL-E-4682. 3.2 nts 3.2.1 3.1.5 Electron Tubes - Electron tubes used in the equipment shall be chosen in accordance with General - The equipment shall fulfill all applicable design and pe

24、rformance requirements of Specification MIL-T-945 unless otherwise specified. Service Conditions - The equipment shall operate satisfactorily under any of the service conditions, or reasonable combination of service conditions, as specified in MIL-T-945 except that the re- quirements specified shall

25、 apply only within the temperature range from -20“ to +51.7“ C (-4“ to +125“ F). Form Factor and Weight - The over-all dimensions of the frequency meter shall not be greater than 8-1/8 inches high, 8-1/2 inches wide, and 8-7/16 inches deep. The total weight shall not be greater than 11.5 pounds. Ope

26、rating Power - The equipment shall operate as specified herein from 115-V a-c 2.1 R-F Output - The radio frequency energy available between the output terminal and ground as intended for use in calibrating radio receivers shall be not less than 2000 UV at any radio frequency in the calibrated range.

27、 3.3.1.3.2.2 Dial Calibration Accuracy - The variable element of the heterodyne oscillator shall be con- nected to a dial assembly having not less than 5000 effective readable divisions. The spacing between adja- cent marks shall be not less than 0.05 inch, At any frequency within the range of the f

28、requency measuring equipment, one dial division shall represent not more than 2.5 kc. After adjusting the heterodyne oscillator for operation at any frequency within its range, noting settings, and then completely detuning, it shall be pos- sible to reset in one minute with an accuracy 10.02 percent

29、 in the low frequency band, and 10.01 percent inthe high frequency band, when approaching such settings from either direction. 3.3.1.3.2.3 Heterodyne Oscillator-Temperature Coefficient - The temperature coefficient of each range of the heterodyne oscillator shall not exceed 0.003 percent per degree

30、C as measured over the range -20 to +51.7“ C. 3.3.1.3.2.4 Calibration Connection Control - The .calibration data for the heterodyne oscillator shall be corrected for a temperature of +20“ C. Correction of the output of the heterodyne oscillator to agree with the calibration data and the crystal stan

31、dard shall be by means of a trimming control located on the front panel which will effect a correction in the frequency of its output, tenance of calibration over long periods of time under conditions of service use. Corrections for variations due to changes in ambient conditions within the specifie

32、d ranges shall be by means of the calibration correc- tor mentioned above. In combination with individual band trimmers which can be adjusted on the front panel by removal of cover plates the design of all circuits shall provide the utmost in frequency stability and accu- racy practicable, 3.$1.3.2.

33、5 Oscillator Design - The design of the heterodyne oscillator shall be such as to insure main- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-18550 bb m 7779906 01277Y7 b m MIL- M- 185 5 O(Aer) 3.3.1.3.2.6 RF Output Accuracy - The emitted freq

34、uency of the measuring equipment operating as a heterodyne oscillator shall be within 0.02 percent of the frequency in the range 125 to 2000 kc and within 0.01 percent of the range 2000 to 20,000 kc within the environmental conditions of MIL-T-945. Detector Output - The detector shall be arranged so

35、 that, in combipation with the audio am- plifier, the output impressed across the phones shall be a substantially linear function of input voltage when the output values lie between 2 and 60 mw. 3.3.1.3.4 Audio Amplifier Output - The audio amplifier shall provide audio outputs of at least 20 mw at 1

36、00 to 500 cycles. A filter shall be provided which begins to cut off the audio frequency above 300 cycles. The zero beat tone shall be sharp and easily detected in flight. Adjustment of the r-f attenuator control shall be allowed for the above. The output circuit shall remove d-c potentials and subs

37、tantially all radio frequency potentials from the telephones. Provision shall be made to use efficiently 600-ohm phones equipped with un- shielded cords. 3.3.1.3.3 3.3.1.3.5 Output Attenuator - A radio frequency coupling attenuator with control on the front panel, shall be provided to permit adjusti

38、ng the r-f output to all values between the output terminal and ground. Use of this control shall not prevent attaining the accuracy of measurements as required herein. It shall also serve to reduce r-f inputs. 3.3.1.3.6 Percentage of Modulation - Suitable provision shall be made to provide approxim

39、ately 500- cycle modulation of the outpu of the heterodyne oscillator for calibrating nonoscillating receivers. Suitable switching devices shall be provided to permit the use of this modulation or not as desired by operating a sin- gle control located on the front panel. About 40 percent modulation

40、shall be provided as measured in the fun- damental ranges of the radio frequency oscillator. It will be satisfactory if the audio output tube is used also as the modulator provided suitable control is provided, and all requirements of specifications are met. 3.3.1.4 Power Rewired - The power require

41、d for the operation of the frequency meter unit shall normally be as follows: Filaments: 11-15 volts; current not to exceed O. 78 amp. or 22-30 volts; current not to exceed O. 031 amp 200-260 volts; current not to exceed O. 02 amp or 260-475 volts; current not to exceed O. 031 amp Plate: 3.3.1.4.1 S

42、witching and Voltage Regulation - Internal link type switching within the unit will be per- mitted to provide for the change in voltages above. An automatic voltage regulator shall be incorporated in the unit in order to stabilize the heterodyne oscillator over the wide input voltage ranges specifie

43、d above. Limited Operation at Reduced VoltaPe - Limited operation shall be possible with voltages representing 90 percent of battery voltages as follows: Filaments: 10.8 volts; current not to exceed O. 6 amp 3.3.1.4.2 Plate: Neoative Voltaoe - The negative side of the filament supply will be grounde

44、d to the plane structure. The negative plate supply to the heterodyne oscillator shall not be conductively grounded in the equipment. 3.3.2 3.3.2.1 162 volts; current not to exceed I). 015 amp 3.3.1.4.3 Frequency Meter Mounting Base, Navy Type-10121 Form Factor and Weight - The over-all dimensions o

45、f the mounting base shall not be greater Construction - The mounting base shall consist of a rectangular aluminum frame member than 7 inches long, 3-7/8 inches wide, and 1-1/2 inches high. The weight shall not be greater than 0.5 pound , which is suitably drilled for rigid mounting and fitted with s

46、pecial mountings at each of the four corners. The -mountings are to be provided with vertically projecting shouldered and grooved metal studs, to which the 3.3.2.2 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-M-l8550(Aer) frequency meter m

47、ay be firmly secured by the operation of two snapslide tabs located at the bottom of the front pdnel. 3.3.3 Rectifier Power Unit PP-loWU- The power unit shall be designed for satisfactorily oper- ating the frequency measuring equipment furnished under this specification by means of a 115 V, 50 to 10

48、00 cycle a-c power source. This unit shall be a complete power supply and include the power unit proper, com- plete with rectifier tube, filters, etc in accordance with MIL-T-945. Form Factor - The over-all dimensions of the rectifier power unit shall not be greater than 14 inches Iong, 10-1/4 inche

49、s wide, and 7-3/4 inches high. The weight shall not be greater than 13.60 pounds, 3.3.3.2 Power Required - The maximum power drawn from the a-c power source shall not exceed 25 watts under load. 3.3.3.3 Construction - Electrically, the power supply shall be capable of furnishing all of the plate 3.3.3.1 and filament voltages necessary for satisfactory operation of the crystal frequency indicator. All components with their associated circuits and controls shall be mounted on a chas