1、1. 1.1 2. COUPLER, ANTEXIJA CIJ-OWU SCOPE MIL-C-25601C -(WZi) I i6 ctoker 2359 S uperseing c NIL-C-2S601E (GG) io April i962 I l l HILIT ARY SPECIFIC ATION This specification covers a multi-band longwire antenna coupler. APPLIC ALLE DOCUMENTS 2.1 vitation for bids, form a part of this specification
2、to the extent specified herein: The following documents of the issue in effect on date of-in- SPECIFICATTONS: MILITARY NIL-C-17/28 Cable, Radio Frequency Coayial . PIIL-C-172 Cases; Bases, Mount.ing, and Mounts, Vibration (for use with Electronic Equipment in Aircraft) MIL-C-O Connectors, Coaxial, R
3、adio Frequency, Series BNC, and Associated Fittings, General Specification for MIL-E-SLOO Electronic Equipment, Aircraft, General Specification for MIL-T-5422 Testing , Environmental, Aircraft Electronic Equipment MIL-R-7276 IZeceiving Set, Radio AW/APN-7OB MIL-S-19500 MIL-C-39012 Semiconductor Devi
4、ces, General Specification ior Connectors, Coarial, Radio Frequency, General Speci- fication for STAl?DPRDS : MILITARY t - o / t - - - - _ - - - - - ,;/ - F- - -. 7-.- . -1 I _-i=- - -_ -_- - f -7 .- - . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
5、,-MIL-C-25601C 57 E 9777906 0436375 2 MIGG25601C (USAF) MIL-STD-471 Maintainability Demonstration MIL-STD-781 Reliability Tests Emonential Distribution MIL-STD-831 Test Reports, Preparation of (Copies of specifications, standards, drawings, and publications required by suppliers in connection Lance
6、falls witkin the specified limits. I1 hT1.7 : 1 . panel for access to this adjustment. The ad;ustment itself shall be sturdy ecough to withstand repeated use and require cnly a standard slot type screw- ciriver. The screw i5self shall be at ground posential. No maintenance ad- zastments shall be req
7、ired under light .conditions. 3.3.2.2 removed from its hozsing, it shall be possible to place it on any side except fr0r.t and rear on a smooth surface without cawing damage to any components. It shall be possible to operate It whei it is removed from i% housing, but the detailed performance specifi
8、ed herein need not be provided while the hcusing is renoved. coupler when removed frm tke nain 3x12: wi%b;t ocjectiomble interference upon any r-f chamel. 8d;ustment provisions - Frovisim shall be made for adjusting TP5.s adiustment shall be labeled A screw cap 3sir.g a condricticg gasket shall be p
9、rovided on %he front Service bench operatlor, - Xken $he coupler CU 308D/U is It shall also be possible :o service and align the 3.3.3 Ciodes - Diodes shall be selected ir, accordance with NIL-S- 19jOO. 3.3.4 Sealing - The cotipler -o a common 50 OHM output jack with sufficient output power to drive
10、 the APN-/OB receiver input (see MIL-R-7276) through a 120 ft length of RG-58/U cable, equipment previously covered by this specification. f. Directly replace, mechanically and electrically all NOTE: No aircraft wiring changes shall be required when this equipment is ri. O Provided by IHSNot for Res
11、aleNo reproduction or networking permitted without license from IHS-,-,-plugged in to repizce older units, or to aad %he LORAN “C“ function to air- craft eqxipped for !IAt1 mly, using tke hTX-70A equipment. g. matching of the an;enna to Che LORN “A, LOW ICt1 and iCOMMtt amplifiers cmtained within th
12、e cmpler unit. pravide afi optimum balance betweeri sensltivity, bandpass, and signal to noise ratio. This coupler shdl provide means for simultaneous The arhenna matching circuitry shall 3.h contract or purchase order, one complete CU.308D/U will be fUrnished by the goverment on loan ,c t3e cor,tra
13、ctor upon his request. Vovernment loaned property - $%en provided for in the 3.5 Electrical Ferformnce 3.5.: de:ermined with the eqUipmerit cornected 8s shown in Figure 1. characteristics of %he LORAX “A an6 the T_X)ZA-l iiCii function in both the local and distance modes shall he as specified in Ta
14、ble 1. The bandpass character- istics O the Com amp7zfier shall be as scecifed in 3-5.4. stall be made under :?e standard tes5 coxlitions specified in 4.3. Eandwidtn - The bandpzss properties of the coupler shall be The bandpass All measurements 2 7.5.2 LCFWi sigr.al re:ec%ior, sersitivi;Jr - The se
15、nsitivity of the L03AIJ I1AI1 node of operation is sck Lhe2 r.ct greater than five microvolts at the an5enna terniml of 1000 cycle 100 percent moddated carrier shall prodJce a five to oze signal plus noise tc Loise ra5o at the receiver ir,c?icator screen. xicrovo1;s are reuuired fzr %he sane resu1:s
16、. figure 4. 3.5.3 ;ims anplifier sexsitivity shall Se s:ck :Bat a two microvolt input signal *thin the freqxeniy rar,ge of two to :hi:?- negahertz shall produce a minimum cf 6 db signal plus ncise to noise ratio, as measxed at either Com orrtput terminal of tke coupler. 3.5.L %ions anplifier seztici
17、n of t froa the roiqler skiai1 occur. fcr the Ix)lig czk:les: 1ntercoraec:ing cables 55zwren ;ke ccU?ler and the vommunicati3r,s receivers or LCMI receivers shall be 100 7eet. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-2560LC 57 9 977770
18、6 04L638L 8 9 e. Primary power supply - AU. detail testing shall be accomplished with the line voltages maintained at 27.5 DC, measured across the input terminals at the coupler end of the primary power supply cable. f. Transistors - The transistors used shall be selected at random from representati
19、ve groups of Lhe selected types. g. Warm-up period - A maximum of five seconds for each test. h. Orientation - Substantially upright. i. This shall be referred to as the nominal test caDacitence. j. Tuning - The antenna tuning capacitor shall be set for a The COH DET switch on the R277C/APN70B shall
20、 be flONtt k. All coaxial lines shall be RG-58/U per mz-c-17/28. 4*3*1 Test conditions (Com amplifier) - Unless otherwise speci- fied, the following test conditions in addition to the standard test condi- tions specified in 4.3 shall apply during aU. tests and performance measure- ments of the commu
21、nications amplifier portion of the coupler, 160 pf antenna. (down) . a. Dummy antenna - The output of the standard signal generator shall be connected to the input of the coupler in parallel with the nominal test capacitance specified in 4,3(i), initial input voltage calibrations shall be made at th
22、e input terminal of the coupler. b. Standard input signal - To be obtained from a standard signal generator, Measurements Co Model 65B or equal. c, Radio test receiver - Empire devices NF i05 or equal shall be calibrated and operated as directed in the instruction manual for that equipment. 4*3*2 Te
23、st conditions - LORAN - Unless otherwise specified, the following %est conditions in addition to the standard test conditions specified in 4.3 shall apply during al1 tests and performance measurements of the LORAN portion of the coupler. 43.2.1 Coupler output load - The coupler output load on the co
24、upler through the transmissLon line shall consist of a 50 ohm resistor at the end of 100 feet of RG-58/U co422. h.6.3.6,1 vented test chamber in a mnner simulating installed canditions whenever possible, such as loosely woven glass cloth to prevent the development of corrosion due to contact of diss
25、imilar metals. against dripping of condensed moisture by an antidrip device that will not impair the flow of air through the test compartment. antidrip device is, though not limited to, a gabled or sloped roof, Humidity - The couplers shall be tested in accordance Test installation - The equipment s
26、hall be placed in a The equipment shall be placed on an inert, interposing material The equipment shall be protected An example of this 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-25601C ( USAF I 4.6.4 168 hour test to determine conforma
27、nce 5s this specificason. procedures shall be used: Equipment Stability - The coupler shall be subjected to The following a. The coupler shall be tuned and loaded In accordance with the reqdrernerits specified in 4.3. O. (Alternately in the !IC1 and “All mode). The cycle duty shall be in accordance
28、with the following procedure: (1) Twentpfive (25) seconds of operation rnaxim-m sensitivity (remote operation). (2) Twenty-five (25) seconds of operation minimum sensitivity (local operation) (3) Ten (10) seconds power off. c. The equipment shall be tested for conformance with 3.5. 4.6.5 demonstrati
29、on test shall be coEducted in accordance with test level F of YJL-STD-78l. inspection tests. h.6.6 be conducted ir, accordarice with the reqrrirements of 4.6.5. Reliability demmstration test - The reliability Accept-reject criteria plar. III fcr quality conformance Longevity test - An accuwlable lon
30、gevity test shall 4.6.7 tion shall be in accordance with lZLSTD-L+?l. shall be demonstrated to a corifidence level cf 90 percent. Maintainability - Kaintainability tests and demonstra- The cpantitative requirements 4.7 Desigr, data and naterial 4.7.1 prepare a preprodaction test repor: in accordance
31、 with MIL-STD-831. Preproduction test report - The contractor shall 5. PREPARATION FO3 CELIVERY 5.1 delivery irisaccordam!e with the iwtructions of the procuring activity. 5.2 as specified by the prociring activity. The Coupler, Anterna CU-3081j/U shall be prepared for Reinspection markings - Reinsp
32、ection markings shall be 6. NOTES 5.1 by this specificatioE is intended foi. rise in aircraft to match impedances, simplify signals, reject near band icterference, etc, with LORAN receiv- ing and high frequency communicaticn syskerns. Intended use - The CoJpler, Anteraa CU-308D/U covered 13 Provided
33、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-2S6O1C (US) 6.2 Ordering data - Procurement documents should specifiy the following: a, Title, number, and date of this specification. b. Stock number. c. Preproduction samples and test. (1) Number of pre
34、production samples. (2) Point of inspection, (3) Requirement for concument delivery of each sample and its test data, notice when the preproduction tests are to be conducted so that they may be supervised or witnessed, if desired, by a government representative, Selection of applicable levels of pre
35、servation end packaging The procuring activity should be given at least ten days prior d, and packing. Custodians : Air Force - 85 Preparing Activity: Air Force - 85 (Project 5985-F305) Reviewer Activity : Air Force - 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without li
36、cense from IHS-,-,-MIL-C-2560LC 59 9999906 OLiL63 O = IlIEC-25601C (USAF C C O o C J Q) O z c n 5 U .- FIGURE I LORAN bandpasc tests /LORAN “C“ Input Impedence 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7 ;N/ Co ?- o E C O FIGURE 2 Communicat
37、ions Amplifier Bandwidth /Sensitivity Tests 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-25bOLC 59 7799906 OLiLb370 7 I- - a Y rn -IM I -1s -1; II FIGURE 3 Input inpedence tests ,foi Communications Amplifier and Loran A frequencies 17 Pro
38、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-25bOLC 59 9999906 04Lh393 O W - W C C L E E n 3 - : C t J 1 Y Fc AiM- u. a O - O rn J 7 T FIGURE 4 Loran sensitivity tests 18 M O a v) c o c c t .- B u) C O .- c Provided by IHSNot for ResaleNo repro
39、duction or networking permitted without license from IHS-,-,-MIL-C-25601C 57 m 9777706 0436372 2 W E !i! -# r“ Je -4 MIL- C-25 6 O 1C (USAF) (3 K L O m W E .- - .- . -(vm P g O v) u w I- O z FIGURE 5 Intermodulation Spurious Response %ommu n i cat i on s Am p I i f i er 19 Provided by IHSNot for Res
40、aleNo reproduction or networking permitted without license from IHS-,-,-MIL- C-2560lC( USAF) FIGURE 6 Intermodulation Spurious 20 R C O .- + v) - QC .= r= o3 w I- o z Response for Loran ZI and %il Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C
41、-2560LC 59 I 7999906 0437849 4 E FIL-C-256OiC (USAF) MOUNTING *.o I o y- 6.062 -I . I88 f .O05 DIA 8 MOUNTING HOLES (INCLUDING ELONGATED HOLES) 4 - EWE MTG HOLES (REF - CLEARANCE REQUIRED To REMOVE COUPLER FROM !I a MOUNTING L b-,S. 044 I LANTENfA COUPLER CU-308D/U 1 NOTE : I) DIMENSIONS ARE IN INCH
42、ES. UNLESS OTHERWISE SPECIFIED TOLERANCES *.O31 2) ALLOW CLEARANCE FOR REMOVAL OF CONNECTORS AND ASSOCIATED WIRING FIGURE 7 Antenna coupler outline and mounting dimensions 21 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-256OlC (USIIF) Table
43、I Loran Bandpass Characteristics ?I I Minimwn IRef erence fl,-6db Mode Frequenc: Local 99 4KHz Distant 99.5KHz Local or Distant 1846KHz I Bandwidth 1725KHz 1975KHz . Maximg Maximum Maximum 40db 5 Odb 70db Bandwidth Bandwidth Bandwidth 88-112 5KH5 87-114KHz 84-117KH 89-11lK.H 88-112.5KHZ 86-115KH 125
44、0KHz 115OKHz 26502 3000KHz N/A Table II Maximum 90db 3andwjdth 65-13XH 75-125KH Communications Amplifer Bandpass L Frequency 2 7-43. %HZ 3 9-$HZ 5-30MH 30-40MH Minimum output 114 112 2/1 112 . -versus- input voltage ratio L Table III LORAN ?IA11 and Communications Band Input Impedances r Nominal Frequency 2,lMHz 2.4MHz 4.5MHz 10. 14 21 25 30 1.85(?At?) Nominal Impedance 560 470 150 120 82 39 22 15 680 - 4- 20% (in ohm?s), I 22 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
