1、. E- 0 MIL-B-28550 (7) 55 W 7779706 0355475 T ,;3 I: 7) MIL-B-28850(ECj 5 AMENUMENT 7 15 September 1986 SUPERSEDING AMENDCIENT 6 27 January 1986 b MILITARY SPECIFICATION BLANKERS, INTERFERENCE, MX-8757/UPXD MX-8758/UPX, AND MX-8758A/UPX This amendment forms a part of Military Specification MIL-B-288
2、50(EC), dated 13 April 1979, and is approved for use by the Space and Naval Warfare Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. Page 1 TITLE: Delete “and MX-8758/UPX“ and substi tute I, MX-8758/UPX, and MX-8758A/UPXt
3、. 1.1, 1 i ne 1 : Del ete “and MX-8758/UPX and substi tute I, MX-8758/UPX, and MX-8758A/UPXt. 2.1, after “Issues of documents., add: “Unless otherwise specified,“. PAGE 2 2.1, “STANDARDS“, MILITARY“, “MIL-STD-461“: Delete title and substitute: “Electromagnetic Emission And Susceptibility Requirement
4、s For The Control Of Electromagnetic Interference“. 2.1, “STANDARDS, MILITARY“, “MIL-STD-463: Delete title and substitute: I “Definitions And System Of Units, Electromagnetic Interference, And Electromagnetic Compatibility Technology“. 2.1, “STANDARDS“, MILITARY“, after “MIL-STD-113O“, add: DOD-STD-
5、1399, Section 300 Interface Standard For Shipboard Systems, Electric Power, Alternating Current (Metric)“. 3.1, lines 1 and 2: 3.2, line 1: 3.2.1.1.lb, line 2: Delete “f5 percent“ and substitute “f8.5 percent“. PAGE 3 Delete “and the MX-8758/UPX“ and substitute II, the MX-8758/UPX, and the MX-8758A/
6、UPXIt. Delete .“twot and substitute three. 3.2.3, lines i! and 4: Delete “and the MX-8758/UPXm and substitute I, the MX-8758/UPX, and the 3.2.3 through 3.2.3.2.1: 3.2.3 and 3.2.3.2.1, added by Amendment 1 and changed by Amendment 6: Delete and substitute: “3.2.3 MX-8758A/UPX. The MX-8758A/UPX defrui
7、ter design shall employ pulse to pulse defruiting which shall be link setting selectable to be either single, dual or, 2/3 (OR) defruiting Defruiting shall be on a single channel per mode basis for single defruiting, and on a two channel per mode basis for dual or 2/3 (OR) defruiting. MX-8758A/UPXt1
8、. Renumber to 3.2.4 through 3.2.4.2.1. * AMSC N/A FSC 5840 DISTRIBUTION STATEMENT A. Approved for pub1 ic release; distribution is un1 imi ted. 1 of 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-B-28850 (7) 58 7797906 0355496 I I- 2 I . MIL
9、-B-28850(EC) AMENDMENT 7 “3.2.3.1 Modular parameters. The modular parameters shall be as specified in a and b: a. Modes: As specified in 3.2.1.1.1, except that Mode 4 video shall be defruited only b. Range: The range characteristics shall be link selectable or switch selectable to 1. if selected by
10、an internal link or switch, be passed from the unit undefruited. be either of the following: Range selection 1: When this has been selected, the defruiter kX-875bA/UPX shall defruit from mode tag to mode tag, regardless of the interlace sequence, for any repetition rate from 5 pulse repetition frequ
11、ency (PRF) to 1500 PRF. The unit shall operate with any stable or staggered PRF in this range. The unit shall output undefruited video past 350 nm I8.5 percent. 2. -Range selection 2: When this has been selected, the unit shall defruit all video which has a range less than the selected maximum range
12、. The selected maximum range shall be link selectable or internal switch selectable to be any range from 100 nm to 325 nm *5 percent in increments of 25 nm orllless. Video beyond the selected maximum range shall be undefruited output from the MX-8758A/UPX. If Mode 4 defruiting is not selected, Mode
13、4 video will 3.2.3 (new 3.2.41, line 4: After “(350 nm)“ insert “i8.5 percent“. 3.2.4: Delete. 3.2.5: Delete text and substitute: “The components of the defruiter shall conform to the requirements of MIL-STD-461, Class A4 and the interference limits specified therein. defruiter will be operated near
14、, or interconnected with, high power radar equipment from which high levels of RF energy will be radiated and conducted to the defruiter. incorporation of shielding or filtering, or both, in the equipment for proper operation. In service, the Provisions shall be made by 3.2.6a: Delete “2“ and substi
15、tute “4“. PAGE 4 3.2.9: 3.2.11, line 1: MX-8758A/UPX1. 3.2.11, line 9, after “The dimensions of the MX-8758/UPXf, add: Delete “and MX-8758/UPX and substi tute II, MX-8758/UPX, and MX-8758A/UPX1. Delete “and the MX-8758/UPX1 and substitute I, the MX-8758/UPX, and the “and PIX-8758A/UPX“. - PAGE 5 3.2
16、.12.1, line 2, after “60 Hz *IO percent“, add: “(having the characteristics of Type I power 3.2.12.1, last sentence: Delete and substitute: “The electrical requirements of DoD-STD-1349, as specified in DoD-STD-1399, Section 300) .I. Section 300 and MIL-E-16400F apply.“ * 3.2.12.3, 1 ine 5, after “MX
17、-8758/UPX“, add “and the MX-8758A/UPX1. PAGE 6 3.2.21, add as last sentence: “The MX-8758A/UPX defruiter shall have a platform mount only. II PAGE 7 3.2.24.1, line.1: Delete “Whenever practicable, and begin the sentence with “The“. PAGE 8 Add the following new paragraph 3.3.2.3 and renumber existing
18、 3.3.2.3 through 3.3.2.17 to 3.3.2.4 “3.3.2.3 MX-8758A/UPX. through 3.3.2.18: The MX-8758A/UPX defruiter shall perform pulse to pulse single, dual, or 2/3 (OR) defruiting, employing up to ten memory channels. When the defruiter set is turned on, the total memory need not be blank. The incoming video
19、 in response to the first interrogation is 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-28850 (7) 58 m 9999906 0155i.177 3 m MI L-8-28850 ( EC ) AMENDMENT 7 received from the interrogator set (or RT unit) and shall be processed (as require
20、d elsewhere in this specification), and shall be read into the appropriate modes memory channel 1. the incoming video is determined by the presence of the appropriate mode tags. shall be clocked into memory until the range specified in 3.2.3.1b has occurred, or until the maxi- mum range of the defru
21、iter is reached, (after which video shall be passed through the unit unde- fruited), or until another set of mode tags has been received. When video from the second inter- rogation of the same mode occurs, it shall be first processed and then read into the same memory channel in the same position an
22、d in the same manner as the previously stored reply video. Approxi- mately simultaneously, the-delayed video from memory channel 1 shall be read out and stored in memory channel 2 for that mode (to allow for dual defruiting and 2/3 (OR) defruiting, if selected). Mode 4 replies shall be internally se
23、lectable by link or switch to be one of the following: defruited as time decoded video (with separate input and output rear panel jacks from the .composite video jacks) or b) defruited as reply video (this assumes another unit is doing the mode tag retiming), or c) passed through the unit undefruite
24、d for either a or b. In all other respects the operation of the MX-8758A/UPX defruiter shall be identical to the operation of the MX-8758/UPX def rui ter.“. The mode of The incoming video a) 3.3.2.3f (new 3.3.2.4f1, line 2: Delete “450“ - and substitute “1500“. 3.3.2.31 (new 3.3.2.41): Add at the be
25、ginning of the sentence “For the MX-8757/UPX and the MX-8758/UPX def rui ters, I. PAGE 9 3.3.2.4.1 (new 3.3.2.5.lcj, add as last sentence: 3.3.2.4.1d (new 3.3.2.5.1d1, line 2: “The MX-8758A/UPX defruiter shall not require reset signals to operate in range selection i.“. last sentence, “The MX-8758A/
26、UPX defruiter shall operate with range selection 2 if only tagged video is available.“. Delete “3.3.2.4.1“ and substitute “3.3.2.5.1. Add as 3.3.2.5 (new 3.3.2.61, line 2: Delete 3:3.2.4.1“ and substitute 3.3.2.5.1. PAGE 10 3.3.2.8 (new 3.3.2.91, line 2: 3.3.2.8 (new 3.3.2.9), line 5: 3.3.2.9.1 (new
27、 3.3.2.10.11, line 2: After core, insert lor random access“, and line 4: Delete “3.3.2.3“ and substitute “3.3.2.4“. Delete i1450“ and substi tute “1500“. Delete “f5 percent“ and substitute “I8.5 percent“. Add as last sentence, defruiter.“. * “The defruiter shall“. capability of selecting a fixed thr
28、eshold adjust by use of a solderless link, or equivalent.“ “3.3.2.13.1 through 3.3.2.13.2“. “The range increments shall be as specified in 3.2.3.1 for the MX-8758A/UPX 3.3.2.11 (new 3.3.2.12), line 1: Delete “It is desirable for the defruiter to“ and substitute At the end of the paragraph, add “The
29、defruiter shall also have the Delete 3.3.2.12.1 through 3.3.2.12.2“ and substitute 3.3.2.12 (new 3.3.2.13), line 2: PAGE 11 * 3.3.2.12.1.1 (new 3.3.2.13.1.1): Delete and substitute: “3.3.2.13.1.1 Synchronous signals. Synchronous signals shall conform to the requirements specified in a through c: a.
30、For SIF modes, the output signal shall be full amplitude without countdown or deterioration of individual pulse characteristics for SIF reply pulses whose leading edges do not change positions relative to the last pulse (P3) of the mode identification tags or relative to the SIF mode gates by more t
31、han 0.2 ILS (including internal jitter of the defruiter) from one interrogation to the next on the same mode. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-28850 (7) 58 9399906 OL55478 5 - MIL-B-28850(EC) AMENDMENT 7 b. For Mode 4 raw video
32、, the output signal shall be full amplitude without countdown or deterioration of individual pulse characteristics for Mode 4 raw video pulses whose leading edges do not change positions relative to the P4 pulse of the Mode 4 identification tags or relative to the Mode 4 gate by more than 0.2 pis (i
33、ncluding internal jitter of the defruiter) from one Mode 4 interrogation to the next. amplitude without countdown or deterioration of individual pulse characteristics for Mode 4 TDV pulses whose leading edges do not change positions relative to the P4 pulse of the Mode 4 identification tags or relat
34、ive to the Mode 4 gate by more than 0.4 LLS (including internal jitter of defruiter) from one Mode 4 interrogation to the next. c. For Mode 4 time decoded video (TDV), the output signal shall be full For SIF modes and Mode 4 raw video, and TDV, the requirements specified in a through c shall apply i
35、n the presence or absence of fruit (nonsynchronous replies) which precede or overlap the reply codes. I * 3.3.2.12.1.2 (new 3.3.2.13.1.2): Delete and substitute: “3.3;2.13.1,2 Nonsynchronous signals. Nonsynchronous signals shall conform to the requirements of a through c: a. For SIF modes, there sha
36、ll be no output for a reply pulse whose leading edge changes position relative to the last pulse (P3) of the mode identification tags or the leading edge of the SIF mode gates by more than 0.8 ps 10.1 ps (including the internal jitter of defruiter) from one interrogation to the next on the same mode
37、. leading edge changes position relative to the P4 pulse of the Mode 4 identification tags or relative to the Mode 4 gate by more than 1.3 ps IO.1 ps (including the internal jitter of defruiter) from one Mode 4 interrogation to the next. c. For Mode 4 TDV, there shall be no output for a reply pulse
38、whose leading edge changes position relative to the P4 pulse of the Mode 4 identification tags or relative to the Mode 4 gate by more than 1.8 ps 10.1 ps (including the internal jitter of defruiter) from one Mode 4 interrogation to the next. The requirements specified in a through c shall be verifie
39、d for compliance with pulses of nominal duration (0.45 ps) .I defruiting and Mode 4 defruiting shall be exempt from 3.3.2.13.2. b. For Mode 4 raw video, there shall be no output fnr a reply pulse whose 3.3.2.12.2 (new 3.3.2.13.2): 3.3.2.13.3, added by Amendment 1: Delete and substitute: “3.3.2.13.3
40、Fruit rejection characteristics. The fruit rejection characteristics for the MX-8758A/UPX shall be given in the following formulas: Output video PRF for single defruiting = (T2/Tl)xT2/Tl)xT3 Output video PRF for dual defruiting = (T2/Tl)x(T2/Tl)x(T2/TlxT3 Output video PRF for 2/3 (OR) defruiting = (
41、2x(T2/T1) x(T2/Tl)-(T2/Tl)x(T2/T1)x(TZ/Tl)xT3 Add at the end of the paragraph “Dual defruiting and 2/3 (OR) where the fol 1 owing definitions apply: The input video is uniformly distributed noise which has been pulsewidth standardized to the memory cell size, and has a minimum pulse spacing equal to
42、 the length of the accept gate. DEAD TIME is the period of time for each pulse repetition interval (PRI) that the interrogators receiver is off, thus allowing no video to be input to the defruiter during that time. P1 = video PRF input-video PRF input x (DEAD TIME)x(PRF interrogation) T1 = number of
43、 time slots in one PRI = (PRI of the interrogation - DEAD TIME)/memory cell size T2 = number of filled time slots in one PKI = (Pl)x(number of memory cells each video input T3 = Pl/(video PRF input)x(memory cell size)x(number of memory cells each video input pul se occupies or generates)/PRF of the
44、interrogation occupies or generates) 1 The memory cell size for the MX-8758A/UPX shall be no greater than 0.51 US. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-s Ii MIL-B-28850 (7) 58 m 7977906 0355497 7 MIL-B-28850( EC) AMENDMENT 7 The MX-8758A
45、/UPX shall contain at least 65,536 bits of memory for each channel for video storage. Other amounts of memory may be acceptable subject to the approval of the procuring activity.“. TABLE I, added by Amendment 4: Delete. 3.2.2.13a (new 3.3.2.14a) line 1: Delete “3.3.2.4.1a“ and substitute “3.3.2.5.1a
46、“. 3.2.2.13b (new 3.3.2.14b) line 1: Delete 3.3.2.4.1b“ and substitute “3.3.2.51b“. 3.2.2.13 (new 3.3.2.14) line 1: Delete “3.3.2.4.1“ and substitute “3.3.2.5.1“. PAGE 12 line 5, delete “3.3.2.13“ and substitute “3.3.2.14“. 3.3.2.134 (new 3.3.2.14d): 3.3.2.139 (new 3.3.2.1491, added by Amendment 1:
47、Delete and substitute: “g. In line 1, delete “3.3.2.4.1d“ and substitute 3.3.2.5.1d“. In A separate Mode 4 video input line shall be provided for the MX-8758A/UPX defruiter in addition to its specified inputs and outputs.“. After 3.3.2.139 (new 3.3.2.1491: Add the following: “h. When defruiting Mode
48、 4 TDV, no Mode 4 raw video shall be defruited, instead, it shall be routed only to the composite video output line in both standby and defruit positions. Mode 4 TDV separate input shall be outputted to only Mode 4 separate output lines in both standby and defruit positions.“. 3.3.2.13.2.1.1 (new 3.
49、3.2.14.2.1.11, line 1: 3.3.2.13.2.1.2 (new 3.3.2.14.2.1.2) , 1 ine 2: 3.3.2.13.2.2.1e (new 3.3.2.14.2.2.1e): Delete the change made by Amendment 4. 3.3.2.13.2.2.1e (new 3.3.2.14.2.2.1e): Delete and substitute: “e. 3.3.2.13.2.2.2 (new 3.3.2.14.2,2.2), line 2: Delete “3.3.2.4.2“ and substitute “3.3.2.5.2. Delete “3.3.2.5“ and substi tute “3.3.2.6“. Duration: specified in 3.3.2.14.1)“. Same as input video pulse (undelayed video pulse) +0.0
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1