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VHF/UHF Antenna-to-Antenna Coupling Test Report PDF

117 Pages·2012·3.34 MB·English
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RADC-TR-76-180 i In-house Report June 1976 VHF/UHF Antenna-to-Antenna Coupling Test Report Kenneth R. Siarkie(cid:127)vicz Robert L. White < ~DC L LA 1 SEp 71,7 Approved for public release; distribution un'Imited ROME AIR DEVELOPMENT CENTER AIR FORCE SYSTEMS COMMAND GRIFFISS AIR FORCE BASE, NEW YORK 13441 This report has been reviewed by the Office of Information, RADC, and approved for release to the National Technical Information Servlke (NTTS). At NTIS, it will be available to the general public, including foreign rations. This report has beer revi--ved and approved for publization. SAMUEL D. ZACCARI Chief, Compatibility Branch Reliability & Compatibility Divislon APPROVED: JOSE! P J. NARESKY Chief, Reliability & Compatibility Division j FOR THE COIMER: w.Aict. iv / (cid:127)JOHPN. HUSS tIt swne gc1I5 Acting Chief 1.10 Bull P.11.00 3 Plans Office JutS,V ;, CA ]1 1 h . . ... . ... ... . t 1'sF Iy1 10 .AVAILA-11(cid:127)ISti1Y -- h,sl.:- a,(cid:127):uTr 9011L- ro not return this copy. Retain or destroy. r "I. no . VFtC1.ASSlFIED SI riUR.1,C _. A S%' IC A I ON Of THIý' 05 Deff:o~,, 1 REPORT DOCUMENTATIiON PAGE ____ IFR C[OMPLETING FORM FVp~ A..J1 C A7CCFSSIONINO I PECI 'N[C' ATA..Q,ýNUMDEn *RADC-TP.-76-18()___ _____ -- -.- _____ A T TLF (.ný (F, Uff*.'\ L )- .&+biio1e) y ro'Tr* E 0 * VHF/UHF Ancenua-to-Antenaa Coupling Test Report, 1 Juno _13 -. 1 Oct 73 IN /A - _ 2 j T364j -eCOIzIRACý OR GF4NT W~MBtfl'.) Kenne~th R. Siarkiewicz Robert L. White N/A 9PER -ORMNIND OCIANIZif ION NAME AND0 ADDRESS TI PGP :~LE MENT PROJE (-'. IAW ARE A Aý viORK UJT .IUUQr.'Sb RGromife fiAsisr LAierv elFooprmcee ntB asCme, ntNeYr 1(R3B44C1T ) /j62702F 4_______L5400/1f32 1-0-17-ROLLIN OFFICF NAME AND ADDR~ESS - , RFtPOFRl OATE 1~June~? Same j / _______________109 74 -MO.ý: TOR!NG AGENCY ,JAML AOGRESS'!I dIfIfr-n' fl.- C-1z-1111140 Olf-f) iS SECRIT Cncassfie 15a CECLAS',IFICA.TION O0NRON SCH.E DULIE 16 OI;TPI8-jTON STAT EmENT (ot hi. R.P.'I)- Approved for public release; distribution,. unlimited. 17 DISrRIBU IION STATEMENT ýof 1h. *b.t,..ci te,,di I Tto,), 20. It dIff.,enl I-on R.PorI) N/A 19 KEY WORD5 (Continu~e roe'.rte aide it ecoseary a.nd Identify by block.n vmbr)b~ Anter.na Coupling AS-1131 Att n 1 AT1-197 Antenna Electromagneti.- Compatibility AS-1018 Ant~enna AsS-1O97 Antenna ?O ABSTIZACT rContIn.~,' n Fe r. id. It .......I y ad Id~nti-y by b).~ k n..her) t-T his report presents the lc-sults of coupling measuremcnts made between pairs of commonly used communicatioas auteninas (i.2., AT-197, AS-1018, AS-1097, and AS-11.81). The coupling was measured as a function of the horizontal and verti- cal separation distances betwe.-i the antennas. 'rhe measu-cments were made over o frequency range of 100 MHz to 400 M4Hz, and t,e coupling is presented as a function of frequency oa oscillographs. ~ FOAM143 .N0O1 65 IS OBSOLETE 121CLASSIFIED ~y '_- SECURiITY cLASSzzIIcArzoN 6TillS PAG %,f DaOta I , .d) UNCLASSIFIED UNCLASSIFIED SEC I I AI I) CL Ass rI CKAI In Fj TI, 7PA L W", 1)01,IOd) TABLE OF CONTEN~TS PAGE SECTION IN.T RODUjCT ION 1 I I [ACKGROUNIJ III. DESCRIPTION OF ANTENNAS 2 IV1I.V. DESCRIPTION OF TEST SITE 8 11 V. TEST PROCEDURES SYSTEM CALIBRATION 14 16 V II. TEST RESULTS LIST OF FIGURES FIGURE PAGE 1. TYPE AT-197/GR ANTENNA 3 2 TYPE AS-1018/URC ANTENNA 5 3 TYPE AS-1097/GR ANTENNA 6 4. TYPE AS-1181/UR ANTENNA 7 5, POLE NUMBERING AND POSITIONING 9 6. ANTENNA COUPLING MEASUREMENT SETUP 13 7. SYSTEM AND CABLE CALIBRATION 15 I kV I... Pi ~~ AEBLINK-1iOT ?ILMiCD ..-- (cid:127) , (cid:127) , . ,--,L,...,(cid:127). -- -- -(cid:127) .. .. LIST OF TABLES PAGE TABLE 8 TEST ANTFNNA SPECIFICATIONS 14 I1. TEST EQUIPMENT LIST 22 111. INDEX OF TEST PHOTOGRAPHS I 1I vi Iii I. I:iTkOLUCT 1 W' lI1 ,L j Ljct i v of this L-ffurt is to providc (.oupling data on four cormiunications antcnnas utiliziiq sieccifiLcd anterna :jeoi:ctries of horizontal separation and vertical displace- ,:e, t. Tlhree of t.L an tennas operate in the UIF band , whil e tih foirLna operates in the VhF Latiu. Thic teiainder of this report is divioed as follows. Section II outlines the background of the problem and the rtou ireL:ent for tic da ta. The foIl ovi ng thrce sec tioi, iroviu: -j(-scriptions of the ar, tennas, test site anJ test equipw"nt (including test procedures), respectively. Section GiscusCs the systeml calibration data to be used in con- 'I ijuIcLiC'l V,it h tht. eedsureu antenia coup ir ig uata to obta in L!:., -ntLnra -tn-anu rnna cou l inrý. Tiie final section provius oscilloscope photographs of the measured antenna coupling data. II.-- I.,C K 6 ",OUi'b i.c. ;,it Furce Co..ui-uicatioris Service AFCS) is respon siLle fr tl-c Gesign, i,,stall ti on and .,ýainter,3r.:e of Air Force groJnJ coi;m.n(cid:127)ication systems. hs such, it is fr(cid:127).vuently faced with the task of locatinq more thzn one system at the same Iccation. t.1 thougn the systems ,(cid:127)ay be opera tiny aL widely separated frequcncies, thL possibility of mutual interference is still great. This is due to the fact that no system tratismits I just (ine fre ucut.cy aic no system is sensitiive: to just one f requctl y. There are three principal methods that can bc used to reduce tie risk and tile effects of miutual ircompatibility. These are frc('uV,,Ly spdratiuon, timie sLparaLion and spatial separation. T1kv AFCS installations nake use of both frequency and spatial scparatiors, lhowever, data is lacking on the antenna- tu-al.tiUrna coupling as a function of frequency anu horizontal separation and vertical displacc.nett t, etween transmittirn9 anJ rec(ivinn antennias. The data Lontained in this report ýrcviýc thc sl,atial information for specific geomctrics and a'.tcnrdjs i. the VHiF anid L;hF frequency bands. l . LLSLRIPTIO;j OF ,(cid:127)iTE,1,L AS T1 is scctiGn cortairis a summary of the characteristics eaac ii arr t nra. tested. Photographs of the antennas are i:,cludcc ,s v:ell as a taLle outlining the miost relevant c (cid:1)a r !fr, i _r CS Ty'pc .I- 27 (-igure 1 .) c A i-l';ij- is a vertically I-olarized disc-cone antenna 1,!1 uicrati r j it thy. 25-4CG '1,z frequency range. It possesses a raoiation pattern which is circular within 0.5 dL and a 1.6I: , !nxirium, standing wave ratio to a 50-chin system. .... ... I... S. I LI Fijure 1. T(cid:2)pc ,(cid:2)T-197,C!k I IA

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VHF/UHF Antenna-to-Antenna Coupling Test Report . Lroadband cummunications antenna used in the 221-4O0 111!z INCLUdE:' 5-0-7.7 dB.
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