1、MIL-A-Zb33b 57 = 7779706 0033308 I W A”A AT- Viscellaneous Electrical Equipment (73. Dimensions.- Envelope dimensions and mounting dimensions of 3-2.5 Sealine.- All cavities in the antenna normally not occusied by solid structural dielectrics shall be filled with a high-curing- temperature foara die
2、lectric to prevent collection of liquids. Qpeaings used for foaming shall be securely covered with suitable seals to prevent entry of misture or other liquids. Other techniques for sealing may be used subject to meeting the electrical, mechanical, and environmental requirements specified herein. 32.
3、6 Side Thrust Strength.- The antenna shall be designed to withstand side thrust load of 8 pounds per square inch of lateral mea. 32.7 more than three-fourths of an inch into the airstream shall be metallic fi+? shall have metallic-covered leading edges to prevent rain erasion. All other plastic surf
4、aces shall be protected from rain erosion in accordance with NIL-P-7094. Earosion Resistance.- All portions of the antenna which protrude Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. MIL-A-26336 (USAT) 3.3 Perf ormance 3.3.1 Fr6quancy.- The ant
5、enna shall provide perforniance over the radio frequency range of 225 to 400 megacycles par second. 3.3.2 Polarization.- The antenna ehall transmit or receive vertically polarized signals. signals shall be at least 15 db down from that of the vertically polarized signals when testad according to 4.3
6、.4.6 hosein. antenna shall be so designed that the ratio of wrurimum gain to mieiraum gain for the vertical polarized siea1 shall be lms th 2 db when tested according to 4.3.4.6. Transmission or reception of horizontally polmited The 303.3 nuIl edance.- The j-mpedance of the antenna maswed at the co
7、nnection of the transmission lins shall be such that Lhe voltage standing wave ratio (VSWR) produced on Radio Frequency Cable dosa not exceed 2.5 to b between 225 and 299 mgacycles per second . and 2.0 to 1 between 300 and 400 insgacycles per second when tested in accordance with 4.3.4.5. ._ 3.3.4 R
8、adiation Pattern.- The antenna shall be designed for omni- directional radiation pattern coverage. The vestical polarization pattern shall be free of deep nulla when tested according to 4.3.4.6 herein. 3.3.5 averase power of 100 watts when subjected to my combination of the environmental conditions
9、specified herein Radiation Power.- The antenna shall bs capable of hmdbing an 3.3.6 Efficiency.- The antenna assembly, including mtohhg network, if used, shall be constructed of mterfals which are classified as good conductors or good dielectrics. No resistive components shall be used. 3.3.7 1 db of
10、 a matobd qmter-wave stub at any test frequency between 225 and 400 megacycles per second, when tssted according to 4.3.4.7. Radiation Efficiency.- The antenna shall have a gain within . 3.4 Weight.- The weight of the mtema shall no% exceed 24 OCBS. 3.5 _ICientificatho of Product.- bssmbbies, subass
11、emblies, Land p Humidity: Prevailing ambient up to 90 gercent relative humidity. 4.3.1 -3ction Test Smpbes.- When 8pecified in the contract, a minimum of three antennas shall be subjected by the manufacturer to the preproduction tests and the acceptance tests specifie the temperature extresas VSdB m
12、etuxmremn.L;a of ths anterma 8bialZ be mb 4.3.4.6 Polarization Teat.- The antenna under test, when inrstabled in the center of an 8-foot-dimater ground plane for any vertical angle from O0 to +3OO above the ground plane and at any angle in aaimth, 5 Provided by IHSNot for ResaleNo reproduction or ne
13、tworking permitted without license from IHS-,-,-NIL-A-26336 57 977790b 0031313 5 m shall heve a ratio of vertical polarization ta horizontal polarization no lese than 15 db. The antema und,er tests, when iaste.l3.acbed qnwter-wwe w.diiib cu.t to the test frequency. me gain measwuments shell be made
14、at the horizon (grround plane) to vertical angles of +33“, above the gmm.nd plane, and at any azurnith mgle. vertical enfi azimuth angle. Radiation Efffcachgt?, packfid, snd 5.2 Antenna AT-840/AIiC Shiuant I4mking.- Shipment marking nomznclature shall be 6.1 and the fact that the Government nay Gave
15、 formulated, fu*nished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by bplication OP otherwise as in my manner licensing the holder or any other person or corporation, or conveyhie; any rights OF permission to mgnufacture, we, or sell any patented invention that may in my wa37 be related thereto. WADC 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
