Radio Frequency Systems 48750 Models 48750 & 48751 Cellular Repeaters User Manual Manual

Radio Frequency Systems Inc Models 48750 & 48751 Cellular Repeaters Manual

Manual

USERS MANUALFor48750 Series Cellular Repeater200 Pondview Drive, Meriden, CT 06450877 737-9675, Fax 203 821-3852, www.rfsworld.com
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DisclaimerAll information and statements contained herein are accurate to the best of the knowledge of RadioFrequency Systems, but Radio Frequency Systems does not make any warranty with respectthereto, including without limitation any results which may be obtained from the products describedherein or the infringement by such products of any proprietary rights of any persons. Use orapplication of such information or statements is at the user’s sole risk, without any liability on the partof Radio Frequency Systems. Nothing herein shall be construed as license of or recommendation foruse which infringes upon any proprietary rights of any person. Product material and specificationsare subject to change without notice. All sales of the products described herein are subject to RadioFrequency Systems’s standard terms of sale and the specific terms of any particular sale.
USER’S MANUAL SERIES 48750 RF REPEATER AMPLIFIERSi Dwg 13863 / Rev. 5 TABLE OF CONTENTSGeneral Statements -------------------------------------------------------------------------------------- --------1MMPPEE SSttaatteemmeenntt--------------------------------------------------------------------------------- 11FFiieelldd AAlliiggnnmmeenntt SSttaatteemmeenntt------------------------------------------------------------------- 22FFCCCC aanndd DDOOCC CCeerrttiiffiiccaattiioonn----------------------------------------------------------------- 22Product Overview and General Information ----------------------------------------------------- --------3Block Diagram--------------------------------------------------------------------------------- 3Electrical and Mechanical Specifications ------------------------------------------------- 4Outline Drawing ------------------------------------------------------------------------------- 4Automatic Gain Control---------------------------------------------------------------------- 5Table 1. Typical Output Power------------------------------------------------------------ 5AGC Automatic Shutdown ------------------------------------------------------------------ 5Installation Issues---------------------------------------------------------------------------------------- --------6Antenna Isolation ------------------------------------------------------------------------------ 6Installation Proceedure ----------------------------------------------------------------------- 7AC/DC Power---------------------------------------------------------------------------------- 7Diagnostics ------------------------------------------------------------------------------------- 8Test Points -------------------------------------------------------------------------------------- 8Maintenance, Repair, and Warranty---------------------------------------------------------------- --------9Periodic Maintenance ------------------------------------------------------------------------- 9Returning Amplifiers For Repair------------------------------------------------------------ 9Limited Warranty ------------------------------------------------------------------------------ 9
USER’S MANUAL SERIES 48750 RF REPEATER1 120556GENERAL STATEMENTSMMAAXXIIMMUUMM PPEERRMMIISSSSIIBBLLEE EEXXPPOOSSUURREE LLIIMMIITTSSTTHHIISS PPRROODDUUCCTT IISS CCAATTAAGGOORRIICCAALLLLYY EEXXCCLLUUDDEEDD FFRROOMM RROOUUTTIINNEE EENNVVIIRROONNMMEENNTTAALLEEVVAALLUUAATTIIOONN AACCCCOORRDDIINNGG TTOO CCFFRR 4477 SSEECCTTIIOONN 11..11330077..RReeppeeaatteerrss lliikkee tthhee 4488775500 ggeenneerraattee rraaddiioo ssiiggnnaallss aanndd tthheerreebbyy ggiivvee rriissee ttoo eelleeccttrroommaaggnneettiicc ffiieellddss.. TThheeiinnssttaalllleerr iiss eexxppeecctteedd ttoo hhaavvee aa ccoommpplleettee uunnddeerrssttaannddiinngg ooff CCFFRR TTiittllee 4477 sseeccttiioonnss 11..11330077 aanndd 11..11331100.. AAbbrriieeff ddiissccuussssiioonn ffoolllloowwss bbuutt iiss nnoott iinntteennddeedd ttoo bbee aa ssuubbssttiittuuttee.. AAddddiittiioonnaall iinnffoorrmmaattiioonn ccaann aallssoo bbeeoobbttaaiinneedd ffrroomm OOEETT bbuulllliitteenn 6655..!! AANNTTEENNNNAA IINNSSTTAALLLLAATTIIOONN BBYY QQUUAALLIIFFIIEEDD TTEECCHHNNIICCAALL PPEERRSSOONNNNEELL OONNLLYY..!! IINNSSTTAALLLLAATTIIOONN IINNSSTTRRUUCCTTIIOONNSS AARREE FFOORR TTHHEE PPUURRPPOOSSEE OOFF SSAATTIISSFFYYIINNGG FFCCCC RRFFEEXXPPOOSSUURREE CCOOMMPPLLIIAANNCCEE AANNDD AARREE NNOOTT OOPPTTIIOONNAALL..!! AALLLL AANNTTEENNNNAASS ((DDOONNOORR AANNDD SSEERRVVIICCEE)) AARREE TTOO BBEE FFIIXXEEDD MMOOUUNNTTEEDD AANNDDPPHHYYSSIICCAALLLLYY SSEECCUURREE TTOO OONNEE LLOOCCAATTIIOONN..!! MMAAXXIIMMUUMM DDOONNOORR AANNTTEENNNNAA GGAAIINN 2288 DDBB!! NNOONN--BBUUIILLDDIINNGG MMOOUUNNTTEEDD DDOONNOORR AANNTTEENNNNAASS MMUUSSTT BBEE GGRREEAATTEERR TTHHEENN 1100MMEETTEERRSS AABBOOVVEE GGRROOUUNNDD..!! MMAAXXIIMMUUMM SSEERRVVIICCEE AARREEAA AANNTTEENNNNAA EERRPP IISS 11..00 WWAATTTT!! MMIINNIIMMUUMM SSEEPPEERRAATTIIOONN TTOO AANNYY BBOODDYY PPAARRTT OOFF AANNYY PPEERRSSOONN IISS 2255 CCMMTThheerree aarree ttwwoo ttyyppeess ooff aanntteennnnaass aattttaacchheedd ttoo tthhee 4488775500.. TThhee ddoonnoorr aanntteennnnaa iiss ttyyppiiccaall rrooooff mmoouunntteedd aannddsseerrvviiccee aanntteennnnaass aarree ttyyppiiccaallllyy mmoouunntteedd iinn ppuubblliiccaallllyy aasssseessaabbllee aarreeaass.. AAllll ooff tthhee aanntteennnnaass aarree ffiixxeeddmmoouunntteedd.. IInnssttaallllaattiioonn ccoonnssiiddeerraattiioonnss ffoorr bbootthh ooff tthheessee wwiillll bbee ddiissccuusssseedd sseeppaarraatteellyy..DDoonnoorr aanntteennnnaass rreecceeiivvee tthhee BBaassee ssiittee TTXX ssiiggnnaallss aanndd ttrraannssmmiitt tthhee mmoobbiillee TTXX ssiiggnnaallss ((882244--884499 MMHHzz))bbaacckk ttoo tthhee bbaassee ssiittee ((uupplliinnkk ppaatthh)).. TThheessee aarree ttyyppiiccaallllyy mmoouunntteedd oonn rrooooff ttooppss oorr ttoowweerr ssttrruuccttuurreess.. TThheemmaaxxiimmuumm ccoommppoossiittee ppoowweerr ooff tthhee 4488775500 uupplliinnkk ppaatthh iiss 11000000 mmWW ((++3300 ddBBmm)).. SSeeccttiioonn 11..330077 ((bb)) ((11))eexxcclluuddeess ffrroomm rroouuttiinnee eennvviirroonnmmeennttaall eevvaalluuaattiioonn ffaacciilliittiieess,, ooppeerraattiioonnss,, aanndd ttrraannssmmiitttteerrss tthhaatt,, aaccccoorrddiinngg ttoottaabbllee 11 ““CCeelllluullaarr RRaaddiiootteelleepphhoonnee SSeerrvviiccee””,, aarree lleessss tthheenn 11000000 WW EERRPP ffoorr bbuuiillddiinngg mmoouunntteedd aanntteennnnaass aannddlleessss tthheenn 11000000 WW aanndd ggrreeaatteerr tthheenn 1100 mmeetteerrss aabboovvee ggrroouunndd ffoorr nnoonn--bbuuiilliiddnngg mmoouunntteedd aanntteennnnaass.. AAss ssuucchh,,wwiitthh aa mmaaxxiimmuumm ppoowweerr ffrroomm tthhee 4488775500 uupplliinnkk ppaatthh ooff 11000000 mmWW ((++3300 ddBBmm)) aanndd aa mmaaxxiimmuumm aanntteennnnaa ggaaiinnooff 2288 ddBB,, tthhee ddoonnoorr aanntteennnnaa iinnssttaallllaattiioonn wwiillll nnoott eexxcceeeedd 11000000 WWaattttss ((++6600 ddBBmm)) aanndd iiss ccaattaaggoorriiccaallllyyeexxllccuuddeedd..HHoowweevveerr,, aaccccoorrddiinngg ttoo sseeccttiioonn 11..11330077 ((bb)) ((11)),, tthhee aapppprroopprriiaattee eexxppoossuurree lliimmiittss ooff 11..11331100 aarree aapppplliiccaabbllee ttooaallll ffaacciilliittiieess,, ooppeerraattiioonnss,, aanndd ttrraannssmmiitttteerrss.. AAss ssuucchh,, tthhee MMPPEE ((mmaaxxiimmuumm ppeerrmmiissssaabbllee eexxppoossuurree)) ooff sseeccttiioonn11..11331100 aappppllyy ttoo tthhee ddoonnoorr aanntteennnnaa iinnssttaallllaattiioonn.. OOEETT BBuulllliitteenn 6655 pprroovviiddeess ssoommee mmeetthhooddss ccaallccuullaattiinngg tthheeppoowweerr ddeennssiittyy bbaasseedd uuppoonn tthhee EERRPP aanndd ddiissttaannccee.. IItt wwoouulldd bbee iimmppoossssiibbllee ttoo ccoovveerr eevveerryy ppoossssiibblleeccoonnffiigguurraattiioonn iinn tthhiiss mmaannuuaall.. LLiikkeewwiissee iitt wwoouulldd bbee uunnrreeaassoonnaabbllee ttoo ddiiccttaattee tthhee eexxaacctt ppaarraammeetteerrss ffoorr eevveerryyiinnssttaallllaattiioonn.. AAss mmeennttiioonneedd iinn tthhee bbeeggiinnnniinngg ooff tthhiiss sseeccttiioonn,, iitt iiss tthhee rreessppoonnssiibbiilliittyy ooff tthhee iinnssttaalllleerr ttoo kknnoowwaanndd aassssuurree tthhaatt sseeccttiioonnss 11..11330077 aanndd 11..11331100 aarree bbeeiinngg mmeett..NNoonneetthheelleessss,, aa rreeccccoommeennddeedd iinnssttaallllaattiioonn sseennaarriioo ffoorr tthhee ddoonnoorr aanntteennnnaa iiss pprroovviiddeedd.. AAssssuummiinngg aa rrooooff ttooppiinnssttaallllaattiioonn aanndd tthhaatt tthhee aarreeaa iiss uunnccoonnttrroolllleedd// ggeenneerraall ppooppuullaattiioonn ((wwoorrssee ccaassee)),, tthhee MMPPEE aatt 882244 MMHHzz iiss ..554499
USER’S MANUAL SERIES 48750 RF REPEATERDwg xxxxx / Rev. 1 2mmWW ppeerr ccmm22.. AA hhiigghheerr lleevveell iiss ssppeecciiffiieedd ffoorr ccoonnttrroolllleedd aarreeaass iinn 11..11331100 ttaabbllee 11 ((AA)).. UUssiinngg aa 1100 ddBB ggaaiinnyyaaggii aanntteennnnaa ((ttyyppiiccaall iinn aabboouutt 8800%% ooff iinnssttaallllaattiioonnss)) aanndd aassssuummiinngg tthhee uupplliinnkk iiss bbeeiinngg ddrriivveenn ttoo iittssmmaaxxiimmuumm oouuttppuutt ppoowweerr ((++3300 ddBBmm)),, tthhee rreessuullttaanntt EERRPP iiss ++4400 ddBBmm oorr 1100,,000000 mmWW.. OOEETT BBuulllliitteenn 6655pprroovviiddeess tthhee ffoorrmmuullaa bbeellooww ffoorr ccaallccuullaattiinngg tthhee ppoowweerr ddeennssiittyy wwiitthh tthhee EEPPAA rreeccccoommeennddeedd ffaaccttoorr ffoorr ggrroouunnddrreellffeeccttiioonn::11..0055 EERRPP // ππ RR22WWhheerree RR iiss tthhee ddiissttaannccee ttoo cceenntteerr ((aannyy bbooddyy ppaarrtt ooff ppeerrssoonn))SSoollvviinngg ffoorr 1100,,000000 mmWW aatt 33 fftt.. ((9911..4444 ccmm)) wwee ggeett aa ppoowweerr ddeennssiittyy ooff ..44 mmWW ppeerr ccmm22..TThhee yyaaggii aanntteennnnaa iinn tthhiiss sseennaarriioo mmuusstt bbee mmoouunntteedd iinn ssuucchh aa wwaayy tthhaatt nnoo bbooddyy ppaarrtt ooff aannyy ppeerrssoonn mmaayy ccoommeecclloosseerr tthheenn 33 ffeeeett iinn tthhee ddiirreeccttiioonn ooff tthhee mmaaiinn ppoowweerr bbeeaamm.. TThhiiss wwiillll lliimmiitt eexxppoossuurree ttoo wweellll wwiitthhiinn tthheeMMPPEESSeerrvviiccee aanntteennnnaass aarree aallssoo ffiixxeedd mmoouunntteedd aanndd ccoovveerreedd bbyy tthhee ssaammee MMPPEE ccoonnssiiddeerraattiioonnss aass tthhee ddoonnoorraanntteennnnaa.. HHoowweevveerr,, iitt ccaann bbee aassssuummeedd tthhaatt tthhee aarreeaa iiss aallwwaayyss ggeenneerraall ppooppuullaattiioonn//uunnccoonnttrroolllleedd aanndd tthhaatt tthheemmiinniimmuumm ddiissttaannccee iinn mmoosstt iinnssttaallllaattiioonnss wwiillll bbee lleessss tthheenn 33 ffeeeett.. AAccccoorrddiinngg ttoo ttaabbllee 11 ((BB)) ooff sseeccttiioonn11..11331100,, tthhee MMPPEE ffoorr ppoowweerr ddeennssiittyy aatt 889944 MMHHzz ((wwoorrssee ccaassee ddoowwnnlliinnkk)) iiss ..559966 mmWW // ccmm22.. TThhee mmaaxxiimmuummppoowweerr oouutt ooff tthhee 4488775500 oonn tthhee ddoowwnnlliinnkk ((bbaassee ttoo sseerrvviiccee aarreeaa)) iiss ++3300 ddBBmm ((11000000 mmWW)).. AAssssuummiinngg nnooffeeeeddeerr aabbllee lloossss aanndd aa sseerrvviiccee aarreeaa aanntteennnnaa ggaaiinn ooff 00 ddBB,, aa ssaavvee mmiinniimmuumm sseeppeerraattiioonn ooff 2255 ccmm ((1100 iinncchheess))iiss rreeqquuiirreedd ttoo ssttaayy wwiitthhiinn tthhee MMPPEE..11..0055 xx 11000000 mmWW // 33..1144 xx 225522 == 11005500 // 11996622..55 == ..553355 mmWW // ccmm22TThhuuss,, tthhee sseerrvviiccee aarreeaa aanntteennnnaass sshhoouulldd bbee mmoouunntteedd ssuucchh tthhaatt aa nnoo bbooddyy ppaarrttss ooff aannyy ppeerrssoonn mmaayy ccoommeecclloosseerr tthhaatt 2255 ccmm.. TThhee sseerrvviiccee aarreeaa aanntteennnnaa ggaaiinn iiss 00 ddBB iinn tthhee eexxaammppllee aabboovvee bbuutt mmaayy bbee iinnccrreeaasseedd ttoommaakkee uupp ffoorr ccaabbllee aanndd//oorr sspplliitttteerr oorr ttaapp lloosssseess.. FFoorr eexxaammppllee;; iiff aa 22 wwaayy sspplliitttteerr iiss uusseedd ttoo pprroovviiddee ffoorr ttwwooaanntteennnnaass iinn ddiiffffeerreenntt ppaarrttss ooff tthhee sseerrvviiccee aarreeaa,, tthheenn tthhee aanntteennnnaa ggaaiinn mmaayy bbee iinnccrreeaasseedd ttoo 33 ddBB ttoo mmaakkee uuppffoorr tthhee lloossss ooff tthhee sspplliitteerr 33..66 ddBB.. TThhee mmaaxxiimmuumm sseerrvviiccee aarreeaa aanntteennnnaa ggaaiinn ffoorr aannyy ssppeecciiffiicc llooccaattiioonn ccaann bbeeccaallccuullaatteedd bbyy:: 00 ddBB ++ aaccccuummuullaatteedd lloosssseess ttoo tthhee aanntteennnnaa..FIELD TUNE-UP, ALIGNMENT OR CALIBRATIONThe 48750 series of bi-directional amplifers are aligned and calibrated at the time of manufacture.These units are designed to retain this calibration for the useful life of the product. There is no field tune-up or alignment necessary.FCC ID AND CANADA CERTIFICATION NUMBERS The listed models have been tested and granted Certification by the FCC in accordance with Title 47,Part 22, and have been granted Certification by the DOC in accordance with RS 118, Issue 2. The FCC identification number for each particular model appears on a label within the amplifierenclosure as required by the FCC. Applicable FCC Identification and DOC Certification Numbers areshown in Table 1.FCC ID Number CANADA
USER’S MANUAL SERIES 48750 RF REPEATER3 120556IWD 48750 XXXX XXXXPRODUCT OVERVIEW and GENERAL INFORMATION The 48750 series band specific Cellular Repeaters are designed to enhance radio communications inbuildings, basements, tunnels and other RF shielded environments. The 48750 is tuned for A band onlyoperation, the 48751 is tuned for B band only. These units work by receiving and amplifying the Base TX signals via a donor antenna directed at thedesired base site. This RF path is called the ‘downlink”. The amplified base TX signal is re-radiated viaantenna(s) or radiating cable into the “Service Area”. Subscriber mobile RF signals are received by thesame service area radiating elements, amplifed in the “uplink”RF path to be radiated back to the base viathe donor antenna.Duplexing band pass filters direct the RF signal to the proper gain path. Band selective down conversionfiltering is used to provide exceptional band edge rejection of the competitive spectrum. Amplificationconsist of independent amplifiers in the Down and Up links respectively, as shown in the block diagram.Both links have AGC to prevent overdrive. Manual gain adjustment is provided. The composite outputpower is set at the factory and limited by the AGC circuitry so that intermodulation signals will not exceed-13 dBm as specified by the FCC. LED indicators provide visual diagnostics for the 48750 series. DC and TTL Test points provide moreindepth information for set up and troubleshooting. Together with the diagnostics section of this manual,these features make field set up and repair fast and easy.
USER’S MANUAL SERIES 48750 RF REPEATERDwg xxxxx / Rev. 1 4ELECTRICAL / MECHANICAL SPECIFICATIONSSSPPEECCIIFFIICCAATTIIOONNSS DDoowwnnlliinnkk UUpplliinnkk4488775500 FFrreeqquueennccyy,, MMHHzz886699--888800 // 889900--889911..55882244--883355 // 884455--884466..554488775511 FFrreeqquueennccyy,, MMHHzz888800--889900 // 889911..55--889944883355--884455 // 884466..55--884499GGaaiinn,, nnoo AAtttteennuuaattiioonn,, TTyypp..7799 ddBB7799 ddBBGGaaiinn FFllaattnneessss,, TTyypp.. ±±11..00 ddBB±± 11..00 ddBBMMaannuuaall AAtttteennuuaattoorr RRaannggee1155 ddBB1155 ddBBOOuuttppuutt LLiimmiitteerr RRaannggee,, aauuttoommaattiicc** 2200 ddBB2200 ddBBNNooiissee FFiigguurree,, TTyypp..99..00 ddBB99..00 ddBBCCoommppoossiittee PPoowweerr****++3300 ddBBmm++3300 ddBBmm CCDDMMAA,, TTDDMMAA++2277 ddBBmm++2277 ddBBmmPPoowweerr lliisstteedd iiss ffoorr ssiinnggllee cchhaannnneell ooppeerraattiioonn.. PPoowweerr ppeerr cchhaannnneell ffoorr mmuullttiippllee ssiiggnnaall ooppeerraattiioonn iiss rreedduucceeddpprrooppoorrttiioonnaallllyy ssuucchh tthhaatt ttyyppiiccaall ppoowweerr ppeerr cchhaannnneell ffoorr 88 cchhaannnneellss == ++1188 ddBBmm,, 1166 cchhaannnneellss == ++1144 ddBBmm,,3322 cchhaannnneellss == ++1100 aanndd 6644 cchhaannnneellss == ++66 ddBBmm..IImmppeeddaannccee 5500 OOhhmmssVVSSWWRR,, iinnppuutt,, bbootthh ppoorrttss 11..55PPrrooppaaggaattiioonn DDeellaayy,, wwoorrssee ccaassee aatt bbaanndd eeddggee<< 33..00 mmiiccrroosseeccoonnddPPoowweerr ,, IEC-320 Socket 112200 VVAACC @@ 11..66 AAOOppeerraattiinngg TTeemmppeerraattuurree,, aammbbiieenntt --3300 ttoo ++5500°° CCCCoonnnneeccttoorrss,, RRFF NN FFeemmaalleeSSiizzee LL XX WW XX DD,,wwaallll mmoouunntt,, 4400 llbbss1133..55 XX 1188..00 XX 77..33 IInncchheessDDiiaaggnnoossttiiccss::TTTTLL,, AAnnaalloogg VVoollttaaggeessPPoowweerr aanndd FFaauulltt LLEEDDss pplluuss 1155 ppiinn ddiiaaggnnoossttiiccss ppoorrtt..AAllaarrmmss ffoorr eeaacchh ccoommppoonneenntt,, oovveerrddrriivvee aanndd oovveerr tteemmppeerraattuurreeOOuuttppuutt DDCCVV ffoorr AAGGCC lleevveell aanndd OOuuttppuutt ddeetteeccttoorrss,, UUpplliinnkk aanndd DDoowwnnlliinnkkRReemmoottee SShhuuttddoowwnn** AAGGCC cciirrccuuiittrryy mmoonniittoorrss tthhee oouuttppuutt ppoowweerr aanndd rreedduucceess tthhee ggaaiinn ttoo pprreevveenntt oovveerrddrriivvee oorr oosscciillllaattiioonn..**** BBDDAA oouuttppuutt ppoowweerr iiss lliimmiitteedd vviiaa iinntteerrnnaall cciirrccuuiittrryy ttoo aassssuurree tthhaatt IIMM lleevveellss ddoo nnoott eexxcceeeedd --1133 ddBBmm..
USER’S MANUAL SERIES 48750 RF REPEATER5 120556INTERMODULATION PRODUCTS, AGC, AND OUTPUT POWER A general requirement exists within 47 CFR 90, Subpart I and 47 CFR 22, Subpart K regardingemissions outside of any particular channel of operation. As a general rule, there shall be no spuriousemissions greater than {43 + 10 Log10 (Power Out watts)} dB below the carrier Power Out (dB) level.This is always equivalent to a fixed level of -13 dBm maximum spurious emission. Radio Frequency Systems has designed the 48750 amplifier line using a combination of an automaticgain control and a low distortion power amplifier to achieve maximum output while automaticallymaintaining spurious intermodulation levels below -13 dBm for any number of input channels. AGC automatically varies the overall gain of the system by up to 20 dB. The gain set by AGC is afunction of the total power present in the amplifier at the final output power amplifier stage. The totalpower level is the sum of all signals within the applicable bandwidth. This includes all active channels, allintermodulation products, and any other noise power in the band. Table 4 lists the typical output power per channel which can be expected from the amplifier for a givennumber of active channels operating at equal input levels. The numbers given in Table 4 are valid onlywhen operating within the active AGC region of the AGC amplifier stage. Operation in the AGC regionoccurs for input power levels such that the sum of total input power plus the amplifier's maximum gainexceeds the stated maximum level for the given number of channels. AGC will then actively limit the totaloutput power to the stated maximum levels.TABLE 1. TYPICAL OUTPUT POWER                AGC AUTOMATIC SHUTDOWN When the automatic gain control circuit reaches its control limit, power to the power amplifier stage iscut. This feature ensures that spurious emissions are never allowed to exceed permissible levels. Notethat only the path (Tx or Rx) which has reached its control limit is shut down. Shutdown will only occur if the AGC control limit is reached and maintained for about a half second.Power is then cut for 5 to 7 seconds. After this time-out, power is brought back on-line. If the overloadcondition is still present, shutdown will again occur in about a half second. This cycle will be repeateduntil the condition causing AGC to reach its limit is removed. Conditions which can cause AGC to reach
USER’S MANUAL SERIES 48750 RF REPEATERDwg xxxxx / Rev. 1 6its limit include the presence of one or more very strong channels, a strong in-band noise source, amplifieroscillation, etc.INSTALLATION ISSUESANTENNA ISOLATION Proper implementation of the antennas is absolutely crucial to the repeater system. Several importantissues must be considered when selecting and implementing the antennas. The most importantconsideration, besides the obvious concerns for gain and area of coverage, is the antenna isolation. RadioFrequency Systems Technical Support is available at 800-659-1880 to assist with antenna selection andinstallation considerations. BASE STATION AND SERVICE AREA ANTENNA ISOLATION SHOULD BE A MINIMUM OF 20dB GREATER THAN THE MAXIMUM GAIN OF THE REPEATER AMPLIFIER. If the isolation isless than the amplifier gain, then positive feedback sufficient for oscillation is present in the system. Suchoscillations will overdrive one or both amplifier chains and continuously activate the AGC auto-shutdowncircuitry. This situation will be apparent by all status LEDs lighting up and then quickly off every 5seconds. Also, gain ripple as a function of frequency, antenna spacing, and antenna isolation is always present inthe system due to feedback. The feedback is a function of the frequency and spacing (i.e., the standingwave between the antennas). The magnitude of the ripple can be expected to be on the order of 5.7 dB fora 10 dB isolation-gain margin. 11 dB ripple for a 5 dB isolation margin, 1.7 dB ripple for a 20 dB margin,and 0.5 dB for a 30 dB isolation margin. The ripple goes to infinity at 0 dB margin thus indicating runawayoscillation. In general the magnitude of ripple may be calculated from:Ripple = 20 LOG10 {(1 + [A] [B]) / (1 - [A] [B])} dBwhere: [A] is the magnitude of the forward voltage gain of the repeater as a function of frequency.[B] is the feedback voltage "gain" magnitude as a function of frequency.Antenna isolation may be achieved by several means. High-gain (high directivity) antennas usually have asignificant front-to-back ratio (isolation between front and back). Additional decoupling can be achievedby spatially separating the antennas. Other factors influencing isolation include multi-path reflections,structures, other antennas, passing vehicles, personnel proximity, etc. Generally, for in-building applications with one outside antenna and one or more indoor antennas, theisolation due to spatial separation and the structure itself is adequate. It is always best to measure theactual isolation under worst case conditions, if possible. The most direct way to measure the isolation isto inject a known signal into one antenna, and measure the coupled signal at the other antenna. Thisshould be done across the applicable bandwidth to account for the frequency dependency of standingwaves.4488775500DDoonnoorrAAnntteennnnaaSSeerrvviicceeAAnntteennnnaa((ss))
USER’S MANUAL SERIES 48750 RF REPEATER7 120556INSTALLATION PROCEEDUREReview this entire manual Do not apply power until antennas have been connected to botht eh base and service area ports! Install donor antenna, aligned with desired base site and measure base signal strength.The 48750 has sufficiniet filtering to prevent undesired signals from causing interference, however, itis best to use a directional donor antenna to reduce the chance for interfernece by directing the mobilesignals only towards the desired donor base site.The 48750 will work with a wide range of RF input signal levels. Ideal levels on the down link are inthe range of –60 to –70 dBm. These levels will provide the maximum output power while not causingsignificant ovedrive.! Connect the donor antenna to the 48750 via 50 ohm coaxial cable.Size and type of cable are a matter of choice. Typically ½” Flexwell foam coax is used, plenum ratedfor inside buildings and work areas. However, 7/8th cable may be used to reduce the longitudinal loss.½’ or smaller superflex cables are easier to install but have higher longitudinal loss.! Install service area antenna(s).Determine the location and type of service area antennas is part of the distribution system design.Generally it is desired to minimize the amount of coax that has to be installed. However, in buidlingswith extensive obstructions it may be neccesary to install several service area antennas For assistancewith antenna placement contact RFS Applications Engineering. Observe MPE cautions whendetermining the type and location of all antennas (see section 1)!! Connect service antenna(s) via 50 ohm coaxial cableMultiple service area antenna(s)/radiating cable runs may be connected the 48750. Splitters and tapsmay be used to accommodate unique distribution systems.! Mount the 48750 Repeater upright, make sure there is sufficient space above and below the unit to allowair to flow through the heat sink. Check to make sure the AC power cord can reach the power source.Also provide adaquet bending room for the coxial cable.! Connect 50 ohm cables – donor antenna to “Base”, service antenna(s) to “Service”! Connect AC power to the 48750 and observe power and fault lightsAC / DC POWER AC power is supplied through a standard 3-wire male plug connected through a standard IEC-320 plug.Connect this plug to any standard 3-wire 120 VAC outlet. A 5 x 20 mm, 3.15 amp fast blow fuse is usedto cut power in the event of a severe AC fault. A 5 amp mini ATO fuse is used between the 28 VDCfrom the power supply and the control board which distributes the power to all components. This islocated on the control board. WARNING: ALWAYS REMOVE POWER BEFORE CHECKING OR CHANGING FUSES.120 VAC can be lethal. Always unplug the amplifier before servicing the interior. Never insertconductive objects into any opening. Do not remove or probe under the plastic safety cover over the ACterminals of the 24 VDC power supply. Always use a standard 3-wire electrical outlet with safety groundfor AC power.
USER’S MANUAL SERIES 48750 RF REPEATERDwg xxxxx / Rev. 1 8DIAGNOSTICS A green power LED will light up when AC power is supplied. If this fails, check power source and thethe AC fuse located in the EIC plug. If the power source and fuse are OK then the internal switchingpower supply has failed and will need replacement. The Red LED indicates a summary fault from any of the fault conditions identified in the Test Pointssection. Specific action is describe in that section.TEST POINTSTThhee DD--ssuubb ccoonnnneeccttoorr iiss llooccaatteedd oonn tthhee bboottttoomm ooff tthhee uunniitt.. AA DDCC VVOOMM ccaann bbee uusseedd ttoo qquuiicckkllyy aasssseessss tthheehheeaalltthh ooff tthhee 4488775500.. TThhee ffoolllloowwiinngg iiss tthhee DD--ssuubb ppiinn--oouutt::11 RRxx LLNNAA AAllaarrmm,, llooggiicc,, llooww == ffaauulltt22 TTxx LLNNAA AAllaarrmm,, llooggiicc,, llooww == ffaauulltt33 RRxx CCoonnvveerrtteerr AAllaarrmm,, llooggiicc,, llooww == ffaauulltt44 TTxx CCoonnvveerrtteerr AAllaarrmm,, llooggiicc,, llooww == ffaauulltt55 RRxx PPAA AAllaarrmm,, llooggiicc,, llooww == ffaauulltt66 TTxx PPAA AAllaarrmm,, llooggiicc,, llooww == ffaauullttCCoonnddiittiioonnss 11 –– 66 rreeqquuiirree uunniitt ttoo bbee sseenntt iinn ffoorr sseerrvviiccee77 TTeemmppeerraattuurree AAllaarrmm,, llooggiicc,, llooww == ffaauullttCChheecckk ffoorr aaiirr ffllooww ppaasstt hheeaatt ssiinnkk.. IIff tthhiiss ffaaiillss,, sseenndd uunniitt iinn ffoorr rreeppaaiirr..88 AAGGCC AAllaarrmm,, llooggiicc,, llooww == ffaauullttIInnddiiccaatteess oovveerrddrriivvee.. CChheecckk ffoorr eexxcceessssiivvee iinnppuutt ssiiggnnaall oorr iinnaaddeeqquuaattee aanntteennnnaa iissoollaattiioonn..99 DDiissaabbllee ((iinnppuutt)),, llooggiicc,, hhiigghh == ddiissaabblleeRReemmoottee ddiissaabbllee ffeeaattuurree1100 RRxx AAGGCC VVoollttaaggee,, aannaalloogg,, nnoo AAGGCC aapppprrooxx.. 2266..55VVDDCC,, FFuullll AAGGCC aapppprrooxx.. 77..6655VVDDCC1111 TTxx AAGGCC VVoollttaaggee,, aannaalloogg,, nnoo AAGGCC aapppprrooxx.. 2266..55VVDDCC,, FFuullll AAGGCC aapppprrooxx.. 77..6655VVDDCCPPiinnss 1100 aanndd 1111 pprroovviiddee iinnddiiccaattiioonn ooff tthhee aammoouunntt ooff AAGGCC aatttteennuuaattiioonn.. FFuullll AAGGCC iinnddiiccaatteess ssttrroonnggddrriivvee ssiiggnnaall oorr ppoossssiibbllee oosscciillllaattiioonn aanndd sshhoouulldd bbee aavvooiiddeedd.. CChheecckk ddrriivvee lleevveellss aanndd aanntteennnnaaiissoollaattiioonn.. RReedduuccee mmaannuuaall ggaaiinn ttoo rreellaaxx AAGGCC lleevveell iiff nneeeeddeedd..1122 RRxx DDrriivvee VVoollttaaggee,, aannaalloogg,, aapppprrooxx.. 00 ttoo 33VVDDCC @@ aapppprrooxx.. 00..33VVDDCC ppeerr ddBB wwiitthh nnoo AAGGCC,, cchhaannggeess vveerryylliittttllee iinn AAGGCC1133 TTxx DDrriivvee VVoollttaaggee,, aannaalloogg,, aapppprrooxx.. 00 ttoo 33VVDDCC @@ aapppprrooxx.. 00..33VVDDCC ppeerr ddBB wwiitthh nnoo AAGGCC,, cchhaannggeess vveerryylliittttllee iinn AAGGCC1144 GGrroouunndd1155 ++55VVDDCC,, tthheerrmmaallllyy ffuusseedd ((sseellff--rreesseettttiinngg)),, 5500mmAA mmaaxx..PPiinnss 1144&&1155 aarree uusseedd ttoo ddrriivvee aa ddiiaaggnnoossttiiccss mmoodduullee wwhhiicchh wwiillll pprroovviiddee LLEEDD iinnddiiccaattiioonn ooff tthhee DD--ssuubbppiinnss..
USER’S MANUAL SERIES 48750 RF REPEATER9 120556MAINTENANCE, REPAIR, AND WARRANTYPERIODIC MAINTENANCE There is no maintenance for the 48750. As long as the amplifiers are kept away from extremetemperatures and moisture, the amplifier should provide long-term, care-free operation. However, as a system periodically check all RF connections for corrosion, strain damage, and tightnessand periodically check the AC power connections for integrityORDERING & RETURNING COMPONENTS For technical assistance call Radio Frequency Systems Sales Engineering at 1-800-659-1880. For returns, repairs and ordering, contact Radio Frequency Systems Customer Service at1-800-321-4700 for a Return Authorization Number. Be prepared to provide the model number and serialnumber of the BDA as well as a description of the symptoms of the problem. Send components or units freight-paid with the Return Authorization Number on the outside of thepackage to: Radio Frequency Systems Corvallis4100 S.W. Research WayCorvallis, Oregon 97333LIMITED WARRANTY The Seller warrants that, at the time of shipment, the products manufactured by the Seller are free fromdefects in material and workmanship. The Seller's obligation under this warranty is limited to replacementor repair of such products within one year from date of shipment. No material is accepted for replacementor repair without written authority of the Seller. Replacement or repair is made only after an examinationat the Seller's plant shows defective material or workmanship at the time of manufacture. All shippingcharges on the returned material must be prepaid by the Buyer. The Seller is in no event liable for consequential damages, installation costs or other costs of any natureas a result of the use of the products manufactured by the Seller, whether used in accordance withinstructions or not. The Seller is not liable for replacement of any product damaged by lightning.
USER’S MANUAL SERIES 48750 RF REPEATERDwg xxxxx / Rev. 1 10 THIS WARRANTY IS IN LIEU OF ALL OTHERS, EITHER EXPRESSED OR IMPLIED. Norepresentative is authorized to assume for the Seller any other liability in connection with the Seller'sproducts.

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