1、.- MIL-C-22672B 58 7777706 Oi511i21i O W- M I LI Ci 22 672 8 (WP) 21 OCTOBER 1964 MILITARY s U P E RSD I N G M I L-C-2 2 67 2 A (W EP) 15 MARCH 1963 SPECIFICAT ION CODER-RECEIVER-TRANEBITTER KY0533 (*)/Asa “This Specification has been approved by the Bureau of Naval Weapons, Department of the Navy.“
2、 1. SCOPE SCO e -This specification covers the requirements of the Coder-Receiver-TxwBmit er KP-533 (+t)/ASQ. When used as a part of Integrated Eiectronic Centrals AN/ASQ-S Aircraft, Installation of Zlectronic Equipment, Aircraft, Geneml Specification for Testing , 3nvir onmental, A irc ra f t .lec
3、tr oni c Tquipment Interference Control Requirenents, Aircraft Equipme nt Xeter, Time Totalizing . Electronic and 3lectrical Squiyrent and Associated Repair Parts, Prepamtion for Delivery of Test Procedures; Preproduction and Inspct.j.on, For Aircraft Electronic Equiprent, Formt for Nomenclature arr
4、l Nameplates for Aeronautical Electronic and Associat ed 3quiprnent Integrated Electronics Centrals AM/AS 7 0.2 usec 0.05 to 0.1 usec 0.8 5 O.lusec 0.05 to 0.2 usec 8 j: 0.2 usec 0,.05 to 0.1 usec 0.8 + O.lusec 0.05 to 0.2 usec 21 7 0.2 usec 0.05 to 0.1 mec 0.8 2 O.lusec O.% to 0.2 usec 3/A C 4 WSe
5、Note 0.05 to 0.1 mec 0.5 2 O.lusec 0.05 to 0.2 usec Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-22672B 58 77777Ob OLSLi130 b MIEC-22672B (WP ) #+Note: Four pulses referenced from the first pulse in multiples of two microseconds. the referen
6、ced position. The four pulses may be followed by as inany as 33 additional piilses, spaced as close as 2.0 usec. Each pulse should be located within 2 0.1 usec from 3.3.2.2 be 1030 + 0.2 mc. Interrogation Frequency -_ The interrogation frequency wiil - 3.3.3 Receiver Characteristics 3.3.3.1 Receives
7、 Frequency 3 The receiver shall be adjusted by the supplier such that the center of the receiver bandpass (between polnks 6 dh down) is i030 + 0.5 mc. 3.3.3 m1.1 Beceiver Frequency Drift - -Under all specified seGice conditions the frequency drift shall not exceed - +- 1.5 MC. - ,303 03.2 MiiiSmun T
8、riggering Level (MTL) - Minimumtriggering level is a term applied to the minimum amplitude of the input FG interrogsbion pulses which just cause full firing of the transmitter. ing level measured at the receiver antenna receptacle under,standard test conditions at any frequency to which the receiver
9、 is tuned shall be at least -77 dbm when the interrogation signal is supplied by a 50 ohm signal generator. The minimum triggering level shall not decrease to less than -74 dbm under any reasonable combination of service conditions as specified in Specification MIL-E-5400 for Class 11 equipment. The
10、 mine 3.3.3.6 3.3.3.7 Rejection of Undesired Signals 3.3.3.7.1 I-F Rejection - RF input signals at the I-F amplifier frequency having amplitudes up to 60 db above that of the desired signal shall in no way degrade the specified performance of the equipment. 3.3.3.7.2 ImaEe Rejectdon - FU? input sign
11、als at the receiver image frequency having an anplitude up to 60 db greater than that of the desired signal shall in no way degrade the specified performance of the equipmat. 3.3-307.3 RF Rejection -With the receiver tuned to 1030 mcs. per second, the response to c-w signals, as measured by the volt
12、age at the detector output, shall be at least 30 db belm the response at the desired frequency at all frequencies lower than 1010 and higher than i050 megacycles per second with the exception of the image frequencies which shall be at least 60 db below the response at the desired frequency. 3e3.3.7.
13、h Anti-Jamming Characteristics - The equipment shall operate under ail service conditions in the presence of CW, AMCW, random-spaced milses and reguarly-spced pulses of any spacing including radar interference as follows : (i) If the interrogating signal to which the equ5.pment should reply is betwe
14、en 10 and 50 db above the minimum triggering level, and any interfering signal 10 db dawn fromtheinterrogating signal shall not reduce the number of valid replies by more than 5$. -6- .- . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-22b72B
15、58 M 9777906 0151LI32 T MIL-C-22672 (WP ) For test purposes, the AMC!#J jamming signal may be sirmilated using a signal generator which can be modu- lated 3% by a 1000 cps sine wave; random spaced pulses shall not exceed a total of 1000 pps; remarly spaced pulses shall not exceed 400 pps. Mode 4 Syn
16、c Jamming - Hode 4 operation Will require the use of anti-interference interrogation (AII) type signals. Recognition of this type of interrogation for sync repetition interference reduction will- be accomplished in the receiver-transmitter. nition shall be accomplished by sensing the lack of any pui
17、se in the Mode h interrogation for intervals of a minimum of 4 usec (4.5 2 0.5 usec). An inter- rogation containing such gaps with neither an AI nor information pulse shall cause the generation of a Mode 4 computer reset trigger. cause temination of the Modes 1, 2, 3/11 and C, suppres- sion within 2
18、 usec after its receipt. This recop Also, this trigger shall If the interfering signal consists of randomly spaced pulses only arid the interrogating signal is a Mode 1, 2, 3/A or C interrogation that is 10 db above the interfering sipl, the equipment shall reply to at least 90 per cent of the inter
19、rogations where the randomly spaced pulses are not recognized as normal or side lobe interrogations. 3.3.3.7.5 Input frotection - The equipment shall not be damaged by the application of an R-F signal of any frequency of any amplitude up to 1/2 volt an of any type of modulation applied and measured
20、at the antenna termjnal of the Re ce iver-T ransn-dtter . 3.3.3.7.6 Pulse Width Discrimination Nodes 1, 2, 3/A and C - Received signals between minim triggering level and 6 dti above this.leve1 whose duration is less than 0.3 usec, shall not cause the transponder to initiate reply or suppression act
21、ion. approx5mately a normal interrogation pulse pair condition, any pulse or pair , of pulses each of a duration greater than 1.5 usec shall not cause the trans- ponder to initiate reply or suppression action. Gith the exception of pulses with amplitude variations 303.3 a707 Pulse width Discriminati
22、on Ike 4 - Received signals between minimum triEgering level and 6 dh above this level whose duration is less than 0.2 mec shal not cause the transponder to initiate reply or suppression action. Automatic Overload Control (AOC) - The AOC shall operate to 3.3.3.8 =duce the triggering level to an exte
23、nt which ll prevent the transmitter duty cycle from being exceeded. of operation. When operating within a 0.01 duty factor, the triggering level shall not be reduced by more than 3 db above NTL. factor exceeding 0.012, the triggering level shall be reduced at least 30 db above ETL. The AOC action sh
24、all be equally effective in all modes When operating at a duty -. i; 7 c -9- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-22672B 58 7977706 0353433 3 3.3.3.8.1 Reply Rate Limiting - This control shall limit the number of generated reply trai
25、ns in Modes 1, 2, 3/A, and C ahout regard to the inmiber of pulses in each reply, or whether replies are normal, I/p or Emergency. Trigger-level reduction shall be graduai to prevent weaker interrogations from denying transponder semice to stronger interrogations as a msult of overinterrogation. Wax
26、imum reply rate shall not exceed 120% of the rate at which reduction first begins if the inberrogation signal is increased to 50 db above minimum . triggering level, Hax5mum reply rate shall be adjustable from 500 to 3000 per second. 3.3.3.8.2 Mode 4 Rate Limiter - See paragraph 3.3.ll.k. 3.3.3.9 Su
27、ppression Characteristics 3.3 3 9 -1 Recovery Time, Internal Suppression - The sensitivity of the equipment when operating in Modes 1, 2, 3/A, or C shaU be reduced to at least 69 db below the nNoniialn minimum triggering level for 30 microseconds after the first transmitted pulse and shall reniain a
28、t least 30 db below the !lNodll triggering level for $0 microseconds after tb firsttrans- mitta? pulse, returning to within 3 db of “Nonnaln minimum triggering level within a period of 75 to 125 microsecmds after the last reply pulse transmitted. The sensitivity of the equipment when set to transmit
29、 Ehergency replies shall be reduced at least 69 db belaw the nNomalf* minimum triggering level for 100 microsecoiads and shall return fo wtthin 3 db of the normal triggering level within a periai of 100 to 125 microseconds after the last reply pulse transmitted. Action of the internal circuit that p
30、roduces this desensitized period shall prcduce no interference or adverse effect on the functioning of the external suppression circuit described in 3.3.3.9.3. Recovery time chan be measured frcan the leading edge of the puise of the first reply to the leading edge of the first pulse of the second r
31、eply at the 50% amplitude points of the piilse concerned. 3.3-3.9.2 Suppression Dilrlng Mode 4 Interrogation - Decoding of Modes 1, 2, 3/A, and C, shall be suppressed when the first b pulses OP a Mode -_ - 4 interrogation are received. continue for at least 75 but nab more than 125 microseconds afte
32、r the second pulse, unless this suppression period is tenimted by a disparity puise (3.3.12.4). The first 2 puises of a Mode 4 interrogation shall also be recognized as a legitimte ISIS control signal, and processed as required under 3.3.5. Suppression due to a Mode 4 interrogation shall -10- Provid
33、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-22b72B 58 M 7979706 0151434 3 W MIL-C-2 2 762B (14“ ) 3.3.3.9.2.1 Suppression During Transmission of Mode 4 Replies - Suppression shall continue for 35 f 10 microseconds after Suppression From Merna1 Eq
34、uipmnt - The equipment shall Decoding of Modes 1, 2, 3/11 and C shall be suppressed during transmission of Mode 4 replies. the last transmitted pulse. provide for suppression from external sources having suppression puise character-. istics specified below. One input connector (which may be part of
35、a main chassis connector) shall be provided for this suppression. 3.3.3.9.3 (1) Amplitude 15 to 70 volts (2) Polarity Positive (3) Duration (measured 1.5 to 250 microseconds (4) Input resistance 2200 ohms shunted by 500 picofarads. Damage to the equipment shall not result from an “open“ or “short“ o
36、f the input jack. at 15 volts amplitude) (5) Rise Time Equal to or greater than 10 volts per microsecond. (6) Decay Time (frm Not greater than 10 microseconds 15 to 3 volts) 3.3.3.9.3.1 Operation - Upon application to the receiver-transinitter of a suppression puise having the above characteristics,
37、 decoding of Modes 1, 2, 3/A, C and 4 shall be suppressed for an interval starting nor more than 1 microsecond after the suppression pulse has reached an amplitude of 10 volts and shall continue for at least the duration of the suppression pulse. pulse, the transponder shall regain normal receiver s
38、ensitivity, within 3 db, no later than 15 microseconds after the suppression pulse has fallen to 1.0 volt. After the end of the suppression 3-3.4 Decoder - The equipment shall incorporate decoding circuits for the purpose of distinguishing each of the 5 modes of interrogation described in 3.3.2.1 an
39、d shall furnish a trigger output to the appropriate mode coder. This circuitry shall be such that the reply transmitted by the equipment shall always correspond to the mode of interrogation. equipment to generate a mode 1 reply to a double-pulse interrogation when the puises are spaced less than 2.5
40、 microseconds or greater than 3.8 microseconds. 3.3.4.1 Decoder Tolerance - Mode 1 - The decoder shall not cause the -11- c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-22672B 58 9 7797906 0353435 5 - 311-22672B (VP ) Decoder Tolerance - Mod
41、e 2 - The decoder shall t cause 2 3.3 04. 2 the equipment to generate a mode 2 reply to a double-pulse interr ga%ion when the plses are spaced less than 4.2 microseconds or greater than 5.8 microseconds. 3.3.4.3 Decoder Tolerance - Mode 3/A - The decoder shall not cauce the equipment to generate a m
42、ode 3 reply to a double-pulse interrogation when the pulses are spaced less than 7.2 microseconds or greater than 6.8 microseconds. 3.3.4.4 Decoder Tolerance - Hode C - The decoder shall not cause the equipment to generate a mode C reply to a double-pulse interrogation when the pulses are spaced les
43、s than 20.2 microseconds or greater than 21.8 microseconds . 3.3.4.5 - Decoder Tolerance - Y0d.e 4 - Four pulse interrogation signal with pulses spaced within +0.1 usec from nominal position shall cause the equipment to generate EIode 4 mble triggers. + 0. usec. from nominal position shall not cause
44、 such triggers. Pulses s-aced greater than - 3.3.4.6 Echo Rejection - The radio receiver-transmitter shall contain echo suppression circuitry designed to permit normal operation in the presence of echoes of siEnals in space. 3.3.4.6*1 Desensitization - Upon receipt of any pulse nore than 0.7 microse
45、conds in duration or group of four pulses each more than 0.b microseconds in duration and spzced 2 microseconds, the sensitivity of the receiver shall be lowered so that an additional pdse 9 db or more below the amplitude of ,the single pulse or the four puise group shall not be detected by the Mode
46、 1, 2and 3/A or Node 4 decoders respectivaly. more than 0.4 rrricroseconds in duration and spaced 4 microseconds, the sensitivity of the receiver shall be lowered so that an additional puise 12 db or more below the amplitude of the 4 pulse group and spaced 2 microseconds after the last pulse of the
47、four puise group should not be detected by the Node 4 decoder. exception of the desensitizing pulse, the sensitivity of the receiver shdl not be lowered so that an additional pulse at the same amplitude as the:siggle pulse or the four pulse group is not detected by the Hode 1, 2,and 3/A Upon receipt
48、 of a group of four pilses each With the first microsecond following +he trailing edge of the last or Hode 4 decoders respectively. - Following desensitization, the receiver shall recover sensitivity within 3 db of minimum triggering level) within 15 micro- seconds after reception of a desensitizing
49、 puise having a signal strenfzth up to 50 db above minimum triggering level. F 3.3.4 .6.2 -12- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-22672B 5B 7799906 015L436 7 FIL-C-2 26 7 2B (rtP ) 3.3.4.7 Decoder - Single Pulse - The equipment shall not respond to a sjngle-puise interrogation cipal of any duration, provided that (1) The pulse carries no ripples comparable of normal int err
