1、*- MIL-R-28848 (2) 58 77777Ob 0445b47 4 - HIL-R-28848(EC) AMENDMENT 2 16 December 1985 SUPERSEDING AMENDMENT 1 30 April 1981 I MILITARY SPECIFICATION RADIO SET AN/URC-94( V) This amendment forms a part of Mi 1 itary Specif cat ion MIL-R-28848(EC), dated 30 November 1978, and is approved for use with
2、in the Space and Naval Warfare Systems Command, Department of the tiavy, and is available for use by all Departments and Agencies of the Department of Defense. PAGE 2 * 2.1 “STANDARDS“, “MILITARY“, after “MIL-STD-109“, add: “ M I L - S TD - 1 2 9 Marking For Shipment And Storage“. * 2.1 “STANDARDS“,
3、 “MILITARY“, “MIL-STD-461“, title: Delete and substitute: Electromagnet it Emission And Susceptibility Requirements For The Control Of Electromagnetic Interference“. * 2.1 81STANDARDSt4, “MILITARY“, after “MIL-STD-810“, add: DoD-STO-1399, Interface Standard For Shipboard Systems, Electric Power, Sec
4、tion 300 Alternating Current (Metric) COD-STD-1686 Electrostatic Discharge Control Program For Protection Of Electrical And Electronic Parts, Assemblies And Equipment (Excluding Electr cal ly In it i ated Explos ive Dev ices) (Metric)“ . * 2.1 “PUBLICATIONS“, “National Security Agency“, delete “CSES
5、D-32 TSEC KY-58“. PAGE 3 * 3.4, line 2: Delete I, CSESD-32,“. 3.4.1.1: Delete. 3.4.2.2, line 2: Delete “0.5“ and substitute “1.0“. 3.4.2.2, 1 ine 3: Delete “1.0“ and substitute “3.0“. PAGE 4 * After “3.4.3.1“, add the following new paragraphs: “3.4.3.2 Electrostatic discharge (ESD). When the contrac
6、t requires design or redesign, electrostat ic p-n accordance with the Design protect ion paragraph of DoD-STD-1686. 3.4.3.3 ESD marking. 3.4.3.4 Assembl es. Assembl es shall be marked in accordance with DoD-STD-1686. 3.4.3.5 Equipment enclosures. Equipment enclosures shall be marked in accordance wi
7、th 3.4.3.6 Nonstandard parts. Electrostatic discharge sensitive (ESDS) nonstandard parts shall DoD-STD- 1686. be marked with the sensitive electronic device symbol specified in MIL-STD-129.“. 1 of 5 AWCC N/A FSC 5820 DISTRIBUTIDN STATEMENT A. Approved for pub1 ic release; distribution is un1 imited.
8、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-R -28848( EC) AMENDMENT 2 * 3.4.4: Delete and substitute: The requirements of the Safety criteria paragraph of MIL-E-16400 shall be incorporated in the design of the equipment to preclude personne
9、l from accidentally coming into contact with hazardous electrical potentials.“. * 3.4.5: Delete and substitute: “3.4.4 Safety. “3.4.5 Electromagnetic compatibility (EMC). The equipment shall be self-compatible and shall conform to the requirements of MIL-STD-461 for Class A3 and A4 equipments. MIL-H
10、DBK-241 may be used for guidance in electromagnetic interference (EMI) design of power supplies.“. 3.5.1.1, line 2: Delete “20.32 cm (8.0 in)“ and substitute “22.86 cm (9.0 in)“. PAGE 5 * 3.5.3.1.1: Delete and substitute: 3.5.3.1.1 AC power source. 115/230 volts AC 110 percent single-phase 47 to 63
11、hertz (Hz), including 60-Hz, Type I, shipboard power, as specified in UoD-STD-1399, Section 300. ment shall comply with the user equipment requirements and constraints of DoD-STD-1399 when using Type I power.“. * 3.5.3.7.1: Delete title and substitute: “HF coupler primary power“. The equip- PAGE 6 3
12、.5.4.2, 1 ine i: Between “enclosure“ and “shall“, insert “for the RT-i23O(V)-l/UKC-94(V)“. PAGE 8 TABLE II: In the Indicator column, after “Power meter“, add “(with a red lens)“. PAGE 11 3.5.6.3.3.1, 1 ne 2: Delete “350“ and substitute “300“. PAGE 12 3.6.2.3, lines 1 and 2: Delete “exposed equipment
13、.# and substitute “equipment utilized in a PAGE 15 sheltered area.“. , 3.6.5.10.2: Delete the text and substitute “During normal operation, the coupler shall provide Minimum Detrimental Effect on a receiver signal from the antenna to the 50-ohm coaxial cable from the associated receiver/transmitter,
14、 due to the untuned state of the matching network, over a signal that would be present if no coupler were used.“. 3.8.1, lines 4 and 5: Delete “of the associated RT-123O(V)/URC-94(V)“ and substitute “for the amplifier/control unit. A muting circuit to disable the speaker of a second amplifier/contro
15、l unit sh al 1 be prov I ded. I. PAGE 16 3.9.1, lines 1 and 2: Delete “20.32 cm (8.0 in)“ and “11.43 cm (4.5 in)“ and substitute “22.52 cm (9.25 in)“ and “13.33 cm (5.25 in)“, respectively. * 3.12, (added by AMENDMENT 1): Delete and substitute: l3.12 Workmanship screen. All equipments produced in ac
16、cordance with this specification 2 shall withstand a defect detection vibration screen of random vibration at 0.029 /Hz I3 dB from 80 Hz to 350 Hz and the temperature cycling specified in 4.9.2.“ 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-
17、R-28848 (2) 58 7777706 0445651 2 MIL-R-28848( EC) AMENDMENT 2 PAGE 17 TABLE IV, in the “Inspect ion or test“ and “Requirement paragraph“ columns: TABLE IV, on the line with “Workmanship“: TABLE IV, on the lines with “Temperature ranges“ and “Vibration“: Delete “X“ in the “E“ Delete “Equipment condit
18、ioning“ and “3.4.1.1“ and substitute “Workmanship screen“ and “3.12“, respectively. Add “X“ in the “FA“ and “P columns. co 1 umn . PAGE 22 * 4.9.2, 4.9.2.1, 4.9.2.2, 4.9.2.3, and 4.9.2.4 (added by AMENDMENT 1): Delete and substitute: Vibrat ion and temperature cycl ing shall be performed on each equ
19、ipment. performed at the module, drawer, or end item level. tors shall be exposed to vibration. The workmanship screen shall be the first inspection per- formed under production inspection. The vibration shall be random, or subject to procuring activity approval, pseudo-random or complex waveform vi
20、bration, for an accumulated time of 10 minutes in the axis deemed most susceptible to vibration excitation. All items shall be hard-mounted (with- out shock isolators) and subjected to the vibration conditions of FIGURE 2. Input vibration levels shall be measured at the mounting points of the item u
21、nder vibration. If variations are found at these points, the level used for control purposes shall be the average of the levels at the mounting points. Control equipment having a bandwidth no greater than 10 Hz for vibration frequencies up to 500 Hz and 100 Hz for vibration frequencies above 500 Hz
22、shall be used for the control and analysis of the acceleration spectral density (ASD). The instantaneous acceleration peaks may be limited to three times the rms acceleration level. during vibration and appropriate input signals applied to observe any abnormal conditions of the output functional cha
23、racteristics. the vlbration resumed. “4.9.2 Workmanship screen. Vlbration shall be performed prior to temperature cycling. The vibration may be All the hardware including cables and connec- “4.9.2.1 Random vibration. The item shall be energized All failures occurring during screening shall be correc
24、ted and AS D 0.02 - FflEUENCY (Hr) FIGURE 2. Random vibration curve. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M IL -R -28848 ( EC ) AMENDMENT 2 “4.9.2.2 Temperature cyclin . Each unit shall be subjected to 10 cycles of the temperature curve
25、shown in IGURE 3 . The temPerature rate of change shall be not less than 5C per minute. Unit power shall be turned on and off at the indicated times. The unit shall be positioned for maximum exposure to the changing temperature. Where performance measurements are called for, a minimal functional ope
26、rating test shall be performed. The dwell time shall be maintained until the largest electrical or electronic part in the unit reaches 80 percent of the chamber temperature. When failures occur, the unit shall be reworked and the cycling continued for a cumulative total of 10 cycles. O 2! Dwell +71
27、C -IT Performance Power off -r- / power Off _- - _- - - - Performance measurements time FIGURE 3. One cycle of temperature curve (not to scale)“. * Add the following new paragraph: “4.9.2.3 E uipment configuration. Individual equipments (as specified in 3.3) need not be tested in a syst:m configurat
28、ion provided provision is made to fully exercise all active elec- trical and electromechanical elements. The antenna and H-189/U handset may be excluded from the test, I , 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-28q8 (2) 58 W 779770b
29、0445653 b W MIL-R-28848( EC) AMENDMENT 2 PAGE 24 “4.9.3, after the last sentence: Add “The resulting data shall serve as baseline for tests to be conducted as specified in 4.4.3.“. The margins of this amendment are marked with an asterisk to indicate where changes (additions, modifications, correcti
30、ons, delet ions) from the previous amendment were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors. are cautioned to evaluate the requirements of this document based on the entire content irr
31、espective of the marginal notations and relationship to the last previous amendment. Prepar i ng act i v i ty: NAVY - EC (Project No. 5820-N815(EC) *U.S GOVERNMENT PRINTING OFFICE 1988 - 805-038l41340 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
