USERS MANUAL
For
48710 and 48722
Bi-Directional Amplifiers
CCooppyyrriigghhtt 11999933--RRaaddiioo FFrreeqquueennccyy SSyysstteemmss--AAllll rriigghhttss rreesseerrvveedd.
877 737-9675, Fax 203 821-3852, www.rfsamericas.com
200 Pondview Drive, Meriden, CT 06450
.
Disclaimer
All information and statements contained herein are accurate to the best of the knowledge of Radio
Frequency Systems, but Radio Frequency Systems does not make any warranty with respect
thereto, including without limitation any results which may be obtained from the products described
herein or the infringement by such products of any proprietary rights of any persons. Use or
application of such information or statements is at the user’s sole risk, without any liability on the
part of Radio Frequency Systems. Nothing herein shall be construed as license of or
recommendation for use which infringes upon any proprietary rights of any person. Product
material and specifications are subject to change without notice. All sales of the products described
herein are subject to Radio Frequency Systems’s standard terms of sale and the specific terms of
any particular sale.
USER’S MANUAL SERIES 48750 RF REPEATER AMPLIFIERS
TABLE OF CONTENTS
General Statements---------------------------------------------------------------------------------- --------1
Product Overview ----------------------------------------------------------------------------------- -------- 3
Theory of Operation ----------------------------------------------------------------------- 3
Block Diagram------------------------------------------------------------------------- 3
Installation -------------------------------------------------------------------------------------------- -------- 7
Troubleshooting, Repair, and Warranty ------------------------------------------------------- --------8
MMPPEE SSttaatteemmeenntt----------------------------------------------------------------------------------------------------------------------------------------------------------11
FFiieelldd AAlliiggnnmmeenntt SSttaatteemmeenntt------------------------------------------------------------------------------------------------------------------------------22
FFCCCC aanndd DDOOCC CCeerrttiiffiiccaattiioonn----------------------------------------------------------------------------------------------------------------------------2
Electrical and Mechanical Specifications----------------------------------------------- 4
Outline of Face Plate------------------------------------------------------------------ 4
Intermod, Output Power and AGC ------------------------------------------------------ 5
Table 1. Typical Output Power------------------------------------------------------ 5
AGC Shut Down --------------------------------------------------------------------------- 6
Manual Gain Control ---------------------------------------------------------------------- 6
AC/DC Power ------------------------------------------------------------------------------ 6
Antenna Isolation -------------------------------------------------------------------------- 8
2
Periodic Maintenance-------------------------------------------------------------------- 10
Service ------------------------------------------------------------------------------------- 10
Warranty----------------------------------------------------------------------------------- 10
iDwg 602300003500/Rev.1
USER’S MANUAL
TThhaannkk yyoouu ffoorr sseelleeccttiinngg tthhiiss RRFFSS pprroodduucctt.. WWee aarree ccoonnffiiddeenntt tthhaatt yyoouu wwiillll ffiinndd tthhiiss pprroodduucctt iinn pprrooppeerr wwoorrkkiinngg oorrddeerr,,
mmeeeettiinngg aallll ssttaatteedd ssppeecciiffiiccaattiioonnss.. IIff nnoott,, pplleeaassee ccoonnttaacctt ccuussttoommeerr sseerrvviiccee iimmmmeeddiiaatteellyy 880000 332211--44770000 aanndd wwee wwiillll
rreessoollvvee tthhee ssiittuuaattiioonn wwiitthhoouutt hheessiittaattiioonn..
PPlleeaassee ttaakkee tthhee ttiimmee ttoo rreeaadd tthhrroouugghh tthhiiss ccoonnssiissee mmaannuuaall.. AA ffuullll uunnddeerrssttaannddiinngg ooff tthhee wwaayy tthhiiss pprroodduucctt ooppeerraatteess wwiillll
ssuuppppoorrtt ooppttiimmaall ppeerrffoorrmmaannccee aanndd pprreevveenntt aacccciiddeennttaall ddaammaaggee nnoott ccoovveerreedd bbyy tthhee ssttaatteedd wwaarrrraannttyy.. NNiinneettyy ppeerrcceenntt ooff
iinnssttaallllaattiioonnss hhaavvee nnoo pprroobblleemmss aatt aallll,, iitt’’ss tthhee tteenn ppeerrcceenntt tthhaatt ccaauussee tthhee ffrruussttrraattiioonn..
•• UUnnddeerr nnoo cciirrccuummssttaanncceess sshhoouulldd tthheessee uunniittss bbee ooppeerraatteedd wwiitthhoouutt pprrooppeerr llooaaddss oonn bbootthh aanntteennnnaa ppoorrttss..
EEiitthheerr aa aanntteennnnaa oorr aa 5500 OOhhmm llooaadd,, rraatteedd ffoorr aatt lleeaasstt 11 wwaatttt,, mmuusstt bbee ccoonnnneecctteedd ttoo bbootthh aanntteennnnaa ppoorrttss
bbeeffoorree aapppplliinngg ppoowweerr..
•• TThheessee pprroodduuccttss rreecceeiivvee aanndd aammpplliiffyy RRFF ssiiggnnaallss iinn tthhee 880000 MMHHzz CCeelllluullaarr BBaanndd.. AAss ssuucchh,, tthheessee pprroodduuccttss
aarree iinntteennddeedd ffoorr uussee bbyy tthhee lliisseenncceeee ooff tthhee rreessppeeccttiivvee sseerrvviiccee aanndd sshhoouulldd nnoott bbee uusseedd wwiitthhoouutt tthhee
eexxpprreesssseedd ppeerrmmiissssiioonn ooff tthhee lliisseenncceeee..
•• TThheerree aarree nnoo iinntteerrnnaall aaddjjuussttmmeennttss.. DDoo nnoott rreemmoovvee ccoovveerr eexxcceepptt ffoorr sseerrvviiccee.. PPaatthh mmaannuuaall ggaaiinn
aaddjjuussttmmeenntt aacccceessss hhoolleess aarree cclleeaarrllyy mmaarrkkeedd iinn tthhee bboottttoomm.. UUnnddeerr nnoorrmmaall cciirrccuummssttaanncceess yyoouu nneeeedd nnoott
mmaakkee aannyy aaddjjuussttmmeennttss.. SSeeee iinnssttaallllaattiioonn qquuiikkgguuiiddee ffoorr mmoorree iinnffoorrmmaattiioonn..
Donor
Antenna
FFeeeeddeerr CCaabbllee
5500 OOhhmm
FFoorr ddiissttrriibbuuttiioonn nneettwwoorrkk ddeessiiggnn aassssiissttaannccee,, ccoonnttaacctt oouurr ffiieelldd tteecchhnniiccaall ssuuppppoorrtt aatt 880000 665599--11880000..
SERIES 48750 RF REPEATER
GGEENNEERRAALL SSTTAATTEEMMEENNTTSS
448877110
0
DDiissttrriibbuuttiioonn
NNeettwwoorrkk,,
SSeerrvviiccee
AAnntteennnnaa((ss))
5500 OOhhmm..
iiDwg 602300003500/Rev.1
USER’S MANUAL SERIES 48710 RF REPEATER
MMAAXXIIMMUUMM PPEERRMMIISSSSIIBBLLEE EEXXPPOOSSUURREE LLIIMMIITTSS
TTHHIISS PPRROODDUUCCTT IISS CCAATTAAGGOORRIICCAALLLLYY EEXXCCLLUUDDEEDD FFRROOMM RROOUUTTIINNEE
EENNVVIIRROONNMMEENNTTAALL EEVVAALLUUAATTIIOONN AACCCCOORRDDIINNGG TTOO CCFFRR 4477 SSEECCTTIIOONN 11..11330077..
RReeppeeaatteerrss lliikkee tthhee 4488771100 ggeenneerraattee rraaddiioo ssiiggnnaallss aanndd tthheerreebbyy ggiivvee rriissee ttoo eelleeccttrroommaaggnneettiicc
ffiieellddss.. TThhee iinnssttaalllleerr iiss eexxppeecctteedd ttoo hhaavvee aa ccoommpplleettee uunnddeerrssttaannddiinngg ooff CCFFRR TTiittllee 4477 sseeccttiioonnss 11..11330077 aanndd
11..11331100.. AA bbrriieeff ddiissccuussssiioonn ffoolllloowwss bbuutt iiss nnoott iinntteennddeedd ttoo bbee aa ssuubbssttiittuuttee.. AAddddiittiioonnaall iinnffoorrmmaattiioonn ccaann aallssoo
bbee oobbttaaiinneedd ffrroomm OOEETT bbuulllliitteenn 6655..
AANNTTEENNNNAA IINNSSTTAALLLLAATTIIOONN BBYY QQUUAALLIIFFIIEEDD TTEECCHHNNIICCAALL PPEERRSSOONNNNEELL OONNLLYY..
IINNSSTTAALLLLAATTIIOONN IINNSSTTRRUUCCTTIIOONNSS AARREE FFOORR TTHHEE PPUURRPPOOSSEE OOFF SSAATTIISSFFYYIINNGG FFCCCC RRFF
EEXXPPOOSSUURREE CCOOMMPPLLIIAANNCCEE AANNDD AARREE NNOOTT OOPPTTIIOONNAALL..
AALLLL AANNTTEENNNNAASS ((DDOONNOORR AANNDD SSEERRVVIICCEE)) AARREE TTOO BBEE FFIIXXEEDD MMOOUUNNTTEEDD AANNDD
PPHHYYSSIICCAALLLLYY SSEECCUURREE TTOO OONNEE LLOOCCAATTIIOONN..
MMAAXXIIMMUUMM DDOONNOORR AANNTTEENNNNAA GGAAIINN 2288 DDBB
NNOONN--BBUUIILLDDIINNGG MMOOUUNNTTEEDD DDOONNOORR AANNTTEENNNNAASS MMUUSSTT BBEE GGRREEAATTEERR TTHHEENN 1100
MMEETTEERRSS AABBOOVVEE GGRROOUUNNDD..
MMAAXXIIMMUUMM SSEERRVVIICCEE AARREEAA AANNTTEENNNNAA EERRPP IISS 11..00 WWAATTTT
MMIINNIIMMUUMM SSEEPPAARRAATTIIOONN TTOO AANNYY BBOODDYY PPAARRTT OOFF AANNYY PPEERRSSOONN IISS 2255 CCMM
TThheerree aarree ttwwoo ttyyppeess ooff aanntteennnnaass aattttaacchheedd ttoo tthhee 4488771100.. TThhee ddoonnoorr aanntteennnnaa iiss ttyyppiiccaallllyy rrooooff mmoouunntteedd aanndd
sseerrvviiccee aanntteennnnaass aarree ttyyppiiccaallllyy mmoouunntteedd iinn ppuubblliiccaallllyy aasssseessaabbllee aarreeaass.. AAllll ooff tthhee aanntteennnnaass aarree ffiixxeedd
mmoouunntteedd.. IInnssttaallllaattiioonn ccoonnssiiddeerraattiioonnss ffoorr bbootthh ooff tthheessee wwiillll bbee ddiissccuusssseedd sseeppaarraatteellyy..
s
DDoonnoorr aanntteennnnaas
rreecceeiivvee tthhee BBaassee ssiittee TTXX ssiiggnnaallss aanndd ttrraannssmmiitt tthhee mmoobbiillee TTXX ssiiggnnaallss ((880066--882244 aanndd 889966990022 MMHHzz)) bbaacckk ttoo tthhee bbaassee ssiittee ((uupplliinnkk ppaatthh)).. TThheessee aarree ttyyppiiccaallllyy mmoouunntteedd oonn rrooooff ttooppss oorr ttoowweerr
ssttrruuccttuurreess.. TThhee mmaaxxiimmuumm ccoommppoossiittee ppoowweerr ooff tthhee 4488771100 uupplliinnkk ppaatthh iiss 11..00 WW ((++3300 ddBBmm)).. SSeeccttiioonn 11..330077
((bb)) ((11)) eexxcclluuddeess ffrroomm rroouuttiinnee eennvviirroonnmmeennttaall eevvaalluuaattiioonn ffaacciilliittiieess,, ooppeerraattiioonnss,, aanndd ttrraannssmmiitttteerrss tthhaatt,,
aaccccoorrddiinngg ttoo ttaabbllee 11 ““CCeelllluullaarr RRaaddiiootteelleepphhoonnee SSeerrvviiccee””,, aarree lleessss tthheenn 11000000 WW EERRPP ffoorr bbuuiillddiinngg mmoouunntteedd
aanntteennnnaass aanndd lleessss tthheenn 11000000 WW aanndd ggrreeaatteerr tthheenn 1100 mmeetteerrss aabboovvee ggrroouunndd ffoorr nnoonn--bbuuiilliiddnngg mmoouunntteedd
aanntteennnnaass.. AAss ssuucchh,, wwiitthh aa mmaaxxiimmuumm ppoowweerr ffrroomm tthhee 4488771100 uupplliinnkk ppaatthh ooff 11..00 WW ((++3300 ddBBmm)) aanndd aa
mmaaxxiimmuumm aanntteennnnaa ggaaiinn ooff 2288 ddBB,, tthhee ddoonnoorr aanntteennnnaa iinnssttaallllaattiioonn wwiillll nnoott eexxcceeeedd 11000000 WWaattttss ((++6600 ddBBmm))
aanndd iiss ccaattaaggoorriiccaallllyy eexxllccuuddeedd..
HHoowweevveerr,, aaccccoorrddiinngg ttoo sseeccttiioonn 11..11330077 ((bb)) ((11)),, tthhee aapppprroopprriiaattee eexxppoossuurree lliimmiittss ooff 11..11331100 aarree aapppplliiccaabbllee ttoo
aallll ffaacciilliittiieess,, ooppeerraattiioonnss,, aanndd ttrraannssmmiitttteerrss.. AAss ssuucchh,, tthhee MMPPEE ((mmaaxxiimmuumm ppeerrmmiissssaabbllee eexxppoossuurree)) ooff sseeccttiioonn
11..11331100 aappppllyy ttoo tthhee ddoonnoorr aanntteennnnaa iinnssttaallllaattiioonn.. OOEETT BBuulllliitteenn 6655 pprroovviiddeess ssoommee mmeetthhooddss ooff ccaallccuullaattiinngg
tthhee ppoowweerr ddeennssiittyy bbaasseedd uuppoonn tthhee EERRPP aanndd ddiissttaannccee.. IItt wwoouulldd bbee iimmppoossssiibbllee ttoo ccoovveerr eevveerryy ppoossssiibbllee
ccoonnffiigguurraattiioonn iinn tthhiiss mmaannuuaall.. LLiikkeewwiissee iitt wwoouulldd bbee uunnrreeaassoonnaabbllee ttoo ddiiccttaattee tthhee eexxaacctt ppaarraammeetteerrss ffoorr eevveerryy
iinnssttaallllaattiioonn.. AAss mmeennttiioonneedd iinn tthhee bbeeggiinnnniinngg ooff tthhiiss sseeccttiioonn,, iitt iiss tthhee rreessppoonnssiibbiilliittyy ooff tthhee iinnssttaalllleerr ttoo kknnooww
aanndd aassssuurree tthhaatt sseeccttiioonnss 11..11330077 aanndd 11..11331100 aarree bbeeiinngg mmeett..
TThhee ffoolllloowwiinngg iiss aa ttyyppiiccaall iinnssttaallllaattiioonn sseennaarriioo ffoorr tthhee ddoonnoorr aanntteennnnaa.. AAssssuummiinngg aa rrooooff ttoopp iinnssttaallllaattiioonn aanndd
tthhaatt tthhee aarreeaa iiss uunnccoonnttrroolllleedd// ggeenneerraall ppooppuullaattiioonn ((wwoorrssee ccaassee)),, tthhee MMPPEE aatt 882244 MMHHzz iiss ..554499 mmWW ppeerr ccm
AA hhiigghheerr lleevveell iiss ssppeecciiffiieedd ffoorr ccoonnttrroolllleedd aarreeaass iinn 11..11331100 ttaabbllee 11 ((AA)).. UUssiinngg aa 1100 ddBB ggaaiinn yyaaggii aanntteennnnaa
((ttyyppiiccaall iinn aabboouutt 8800%% ooff iinnssttaallllaattiioonnss)) aanndd aassssuummiinngg tthhee uupplliinnkk iiss bbeeiinngg ddrriivveenn ttoo iittss mmaaxxiimmuumm oouuttppuutt
ppoowweerr ((++3300 ddBBmm)),, tthhee rreessuullttaanntt EERRPP iiss ++4400 ddBBmm oorr 1100,,000000 mmWW.. OOEETT BBuulllliitteenn 6655 pprroovviiddeess tthhee ffoorrmmuullaa
bbeellooww ffoorr ccaallccuullaattiinngg tthhee ppoowweerr ddeennssiittyy wwiitthh tthhee EEPPAA rreeccccoommeennddeedd ffaaccttoorr ffoorr ggrroouunndd rreefflleeccttiioonn::
-
2
2
m
..
1 48710-22Manual.doc
USER’S MANUAL
2
2
11..0055 EERRPP //
ππ R
R
WWhheerree 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 ccm
SERIES 48750 RF REPEATER
2
2
m
..
TThhee yyaaggii aanntteennnnaa iinn tthhiiss sseennaarriioo mmuusstt bbee mmoouunntteedd iinn ssuucchh aa wwaayy tthhaatt nnoo bbooddyy ppaarrtt ooff aannyy ppeerrssoonn mmaayy
ccoommee cclloosseerr tthheenn 33 ffeeeett iinn tthhee ddiirreeccttiioonn ooff tthhee mmaaiinn ppoowweerr bbeeaamm.. TThhiiss wwiillll lliimmiitt eexxppoossuurree ttoo wweellll wwiitthhiinn
tthhee MMPPEE..
SSeerrvviiccee aanntteennnnaas
s
aarree aallssoo ffiixxeedd mmoouunntteedd aanndd ccoovveerreedd bbyy tthhee ssaammee MMPPEE ccoonnssiiddeerraattiioonnss aass tthhee ddoonnoorr
aanntteennnnaa.. HHoowweevveerr,, iitt ccaann bbee aassssuummeedd tthhaatt tthhee aarreeaa iiss aallwwaayyss ggeenneerraall ppooppuullaattiioonn//uunnccoonnttrroolllleedd aanndd tthhaatt tthhee
mmiinniimmuumm ddiissttaannccee iinn mmoosstt iinnssttaallllaattiioonnss wwiillll bbee lleessss tthheenn 33 ffeeeett.. AAccccoorrddiinngg ttoo ttaabbllee 11 ((BB)) ooff sseeccttiioonn
11..11331100,, tthhee MMPPEE ffoorr ppoowweerr ddeennssiittyy aatt 889944 MMHHzz iiss ..559966 mmWW // ccmm22.. TThhee mmaaxxiimmuumm ppoowweerr oouutt ooff tthhee
4488771100 oonn tthhee ddoowwnnlliinnkk ((bbaassee ttoo sseerrvviiccee aarreeaa)) iiss ++3300 ddBBmm ((11000000 mmWW)).. AAssssuummiinngg nnoo ffeeeeddeerr aabbllee lloossss aanndd
aa sseerrvviiccee aarreeaa aanntteennnnaa ggaaiinn ooff 00 ddBB,, aa ssaaffee 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 // ccmm22
TThhuuss,, tthhee sseerrvviiccee aarreeaa aanntteennnnaass sshhoouulldd bbee mmoouunntteedd ssuucchh tthhaatt aa nnoo bbooddyy ppaarrttss ooff aannyy ppeerrssoonn mmaayy ccoommee
cclloosseerr tthhaatt 2255 ccmm.. TThhee sseerrvviiccee aarreeaa aanntteennnnaa ggaaiinn iiss 00 ddBB iinn tthhee eexxaammppllee aabboovvee bbuutt mmaayy bbee iinnccrreeaasseedd ttoo
mmaakkee uupp ffoorr ccaabbllee aanndd//oorr sspplliitttteerr oorr ttaapp lloosssseess.. FFoorr eexxaammppllee;; iiff aa 22 wwaayy sspplliitttteerr iiss uusseedd ttoo pprroovviiddee ffoorr ttwwoo
aanntteennnnaass iinn ddiiffffeerreenntt ppaarrttss ooff tthhee sseerrvviiccee aarreeaa,, tthheenn tthhee aanntteennnnaa ggaaiinn mmaayy bbee iinnccrreeaasseedd ttoo 33 ddBB ttoo mmaakkee uupp
ffoorr tthhee lloossss ooff tthhee sspplliitteerr 33..66 ddBB.. TThhee mmaaxxiimmuumm sseerrvviiccee aarreeaa aanntteennnnaa ggaaiinn ffoorr aannyy ssppeecciiffiicc llooccaattiioonn ccaann bbee
ccaallccuullaatteedd bbyy:: 00 ddBB ++ aaccccuummuullaatteedd lloosssseess ttoo tthhee aanntteennnnaa..
FIELD TUNE-UP, ALIGNMENT OR CALIBRATION
The 48710 series repeaters 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 90, and have been granted Certification by the DOC in accordance with RS 131, Issue 131.
The FCC identification number for each particular model appears on a label on the face plate of the
units. Applicable FCC Identification and Canadian ISC Numbers are shown.
FCC ID Number CANADA
IWD48710 XXXXXXX
PRODUCT OVERVIEW
2Dwg 602300003500/Rev.1 2
USER’S MANUAL SERIES 48710 RF REPEATER
THEORY OF OPERATION
The 48710 series signal boosters are designed to enhance radio communications in buildings, basements,
tunnels and other RF shielded environments. The 48710 is tuned for the 800 MHz SMR band and the
48722 is tuned for the 900 MHz SMR band.
These units work by receiving and amplifying the Base TX signals via a donor antenna directed at the
desired base site. This RF path is called the ‘downlink”. The amplified base TX signal is re-radiated via
antenna(s) or radiating cable into the “Service Area”. Subscriber mobile RF signals are received by the
same service area radiating elements, amplified in the “uplink”RF path to be radiated back to the base via
the donor antenna.
The LNAs and Power Amplifiers are broadband. The same models are used for the uplink and
downlink on both the 48710 and 48722. Likewise, the control board is the same for both models.
Differentation is provided by the duplexing filters on the base and service area connectors that determine
the basic pass band and direct the RF signals to the proper gain path, uplink and downlink respectively.
Both links have automatic gain control (AGC) in the power amplifiers to prevent overdrive. Manual
gain adjustment is provided in the LNA stage. Overdrive limiting is provided by the AGC circuitry and
set at the factory and so that the 48710 series will not exceed the FCC limits for spurious emissions
The control board distributes DC power to the amplifier modules and monitors each module for any
fault condition. LED indicators provide visual diagnostics while the 15 pin din connector has DC and
TTL test points for more in depth trouble shooting.
Block Diagram
Uplink
48710 806-824 MHz
48722 896-902 MHz
PA80-9942
LNA80-0002
Service
Base
LNA80-0002
PA80-9942
Duplexers
48710 5595
Downlink
48710 851-869 MHz
Control Board
48722 J09020
48722 935-941 MHz
ELECTRICAL SPECIFICATIONS
4488771100 FFrreeqquueennccyy,, MMHHzz
2
FFrreeqquueennccyy,, MMHHzz
448877222
3 48710-22Manual.doc
DDoowwnnlliinnk
885511--886699
993355--994411
k
UUpplliinnkk
880066--882244
889966--990011
USER’S MANUAL
SERIES 48750 RF REPEATER
GGaaiinn,, nnoo AAtttteennuuaattiioonn,,
GGaaiinn FFllaattnneessss,, TTyypp..
MMaannuuaall AAtttteennuuaattoorr RRaannggee
OOuuttppuutt LLiimmiitteerr RRaannggee,, aauuttoommaattiicc**
NNooiissee FFiigguurree,, TTyypp..****
CCoommppoossiittee PPoowweerr,, TTyypp..**
iiDDEENN,, CCDDMMAA TTyypp..
IImmppeeddaannccee,, bbootthh ppoorrttss
VVSSWWRR,, iinnppuutt,, bbootthh ppoorrttss
PPrrooppaaggaattiioonn DDeellaayy,, wwoorrsstt ccaassee aatt bbaanndd eeddggee
PPoowweerr ,, 112200//222200 AAuuttoo rraannggiinngg,,
IEC-320 Socket
±±11..00 ddBB
++3300 ddBBmm
++2277 ddBBmm
8800 ddBB
1155 ddBB
2200 ddBB
22..00 ddBB
<< 33..00 mmiiccrroosseeccoonndd
112200 VVAACC @@ 11..55 AA
**AAGGCC cciirrccuuiittrryy mmoonniittoorrss tthhee oouuttppuutt ppoowweerr aanndd rreedduucceess tthhee ggaaiinn ttoo pprreevveenntt oovveerrddrriivvee oorr oosscciillllaattiioonn..
**** NNoo aatttteennuuaattiioonn aanndd rroooomm tteemmppeerraattuurree
MMEECCHHAANNIICCAALL//EENNVVIIRROONNMMEENNTTAALL SSPPEECCIIFFIICCAATTIIOONNSS
CCoonnnneeccttoorrss,, RRFF
WWeeiigghhtt
SSiizzee LL XX WW XX DD,, wwaallll mmoouunntt,, 3366 llbbss
MMoouunnttiinngg CCeenntteerrss
DDiiaaggnnoossttiiccss
OOppeerraattiinngg TTeemmppeerraattuurree,, aammbbiieenntt
HHuummiiddiittyy
EEnnvviirroonnmmeennttaall RRaattiinngg
3333 llbbss ((1166..22 kkgg))
1133..55 XX 1188..55 XX 77..33 ((3344..33 xx 4477 xx 1188..55 ccmm)) IInncchheess
1100..7755 xx 1177..4400 ((2277..33 xx 4444..22 ccmm)) IInncchheess
1155 PPiinn DDiinn CCoonnnneeccttoorr
--3300 ttoo ++5500°° CC
RReellaattiivvee uupp ttoo 9955%% ((nnoonn ccoonnddeennssiinngg))
SSiimmiillaarr ttoo NNeemmaa 33R
8800 ddBB
±± 11..00 ddBB
1155 ddBB
2200 ddBB
22..00 ddBB
++3300 ddBBmm
++2277 ddBBm
m
5500 OOhhmmss
11..55
NN FFeemmaallee
R
INTERMOD, POWER , AND AGC
A requirement exists within 47 CFR 90, regarding emissions outside of any particular channel of
operation. As a general rule, there shall be no spurious emissions greater than {43 + 10 Log10 (Power
Out watts)} dB below the carrier Power Out (dB) level. This is always equivalent to -13 dBm.
4Dwg 602300003500/Rev.1 4
USER’S MANUAL SERIES 48710 RF REPEATER
The primary contributor to spurious emission is multiple signal intermodulation. As multiple signals are
amplified, intermodulation products (IM) are generated. The level of the IM is a factor of the amplifiers
linearity or 3
rd
Order Intercept Point (IP3) and the number and power of signals being amplified (Pout).
IM = 3xPout - 2xIP3
Pout is the combined power of all the signals in the pass band known as the “composite power”. Radio
Frequency Systems has designed the 48710 repeaters using a combination of low distortion amplifiers and
automatic gain control (AGC) to achieve maximum output while automatically limiting spurious
intermodulation levels to -13 dBm or less for any number/power combination of signals.
The AGC circuitry is housed in each power amplifier stage. A detector on the output of the amplifer
provides a DC voltage proportional to the output power. This voltage is compared to a factory setting.
As long as this voltage is less then the setting no action is required. However, when the combination of
signal level and/or number of signals causes the composite power to exceed the safe level, the AGC’s
comparator generates a DC voltage to a pin diode attenuator that increase attenuation in proportion to the
level of the DC voltage.
The attenuation reduces the output power until the detector voltage is at the safe level again. If the
number or power of the signals is reduced the DC offset voltage will reduce level of attenuation. In
typical operation, the AGC is only active when needed to prevent overdrive. If the AGC is constantly
activating it is suggested that you reduce the gain via the manual attenuator and check to make sure that
an oscillation between the base and service area antenna systems does not exist.
AGC in the uplink is rarely needed in modern radio installations. As a portable comes closer to the
internal antenna network its signal becomes stronger to the base site. Typically, the dynamic power
control at the base will turn the portable’s power down to reduce interference and conserve power.
Overdrive is more likely to occur on the downlink path. All active signals at the donor base site will be
amplified by the repeater regardless of whether they are in use in the service area or not. Ideally, the
donor antenna is directional. This limits the number of donor base sites the repeater sees and reduces the
potential for interference. Observing the signal levels before connecting the repeater is reccomended.
Out of band signals can also cause overdrive. The most likely occurance of overdrive is oscilation from
inadaquate antenna isolation.
Table 4 lists the typical output power per signal which can be expected from the 48710 for a given
number of active signal operating at equal input levels. For a donor site that has 16 signals, the full power
per signal would be +14 dBm. Assuming the incoming signal is sufficient such that that level will be
achieved.
TABLE 1. TYPICAL OUTPUT POWER PER SIGNAL
5 48710-22Manual.doc
USER’S MANUAL
Num ber of
SignalsdBm mW
1 30.0 1000
2 26.0 398
4 22.0 160
8 18.063
16 14.025
32 10.010
64 6.55
SERIES 48750 RF REPEATER
IInn aallll ccaasseess tthhee aaccttuuaall ssiiggnnaall oouuttppuutt ppoowweerr iiss eeqquuaall ttoo tthhee iinnppuutt ssiiggnnaall ppoowweerr pplluuss tthhee ggaaiinn ooff tthhee rreeppeeaatteerr..
IIff aa ssiiggnnaall lleevveell ooff ––8800 ddBBmm iiss aatt tthhee iinnppuutt ttoo tthhee rreeppeeaatteerr aanndd tthhee ggaaiinn iiss 8800 ddBB,, tthhee rreessuullttaanntt oouuttppuutt wwiillll
bbee 00 ddBBmm,, nnoott ++1144 aass iinn tthhee aabboovvee ddiissccuussssiioonn.. ++ 1144 ddBBmm iinn tthhiiss ccaassee iiss tthhee mmaaxxiimmuumm.. SSoo,, iiff tthhee
iinnccoommiinngg ssiiggnnaall iiss ––6600 aanndd tthhee ggaaiinn sseett ffoorr 8800 ddBB,, tthhee oouuttppuutt wwoouulldd nnoott bbee ++2200 ddBBmm wwiitthh 1166
ssiimmuullttaanneeaaoouuss ssiiggnnaallss,, tthhee AAGGCC wwoouulldd rreedduuccee tthhee ggaaiinn ttoo 7766 ddBB aanndd tthhee oouuttppuutt ttoo ++1144 ddBBmm ppeerr ssiiggnnaall..
AGC AUTOMATIC SHUTDOWN
When the automatic gain control circuit reaches its limit (20 dB), the power amplifier stage is shut down
to prevent harmful distortion and potential damage to the repeater. Shutdown will only occur if the AGC
control limit is exceeeded for about a half second. Power is then cut for 2 seconds. After this time-out,
power is brought back on-line. If the overload condition is still present, shutdown will again occur in
about 1 second. This cycle will be repeated until the condition causing AGC to reach its limit is removed.
Conditions which can cause AGC to reach its limit include the presence of one or more very strong
channels, a strong in-band noise source, or amplifier oscillation due to inadaquate antenna isolation.
MANUAL GAIN ADJUSTMENT
The independent manual attenuators, RX for uplink and TX for downlink, are accessable from the bottom
of the unit. They are set fully counter clock wise, at min attenuation – max gain. Manual attenuation is
separate from the AGC so these attenuators can be used to reduce overdrive while maintaining the AGC
range. At fully clockwise, 20 dB of attenuation will be introduced in the respective gain path.
AC / 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 used
to cut power in the event of a severe AC fault. A 5 amp mini ATO fuse is used between the 28 VDC from
the power supply and the control board which distributes the power to all components. This is located on
the control board.
WARNING:
VAC can be lethal. Always unplug
objects into any opening. Do not remove or probe
of the 28 VDC power supply. Always use
ALWAYS REMOVE POWER BEFORE CHECKING OR CHANGING FUSES. 120
the amplifier before servicing the interior. Never insert conductive
under the plastic safety cover over the AC terminals
a standard 3-wire electrical outlet with safety ground for AC
power.
INSTALLATION
6Dwg 602300003500/Rev.1 6
USER’S MANUAL SERIES 48710 RF REPEATER
Do not apply power until antennas have been connected to both the base and service area ports
Choosing a location for the 48710 to reside is often dictated by circumstance. These units can
withstand a wide range of environmental conditions but a cooler environment will increase the life of
the product. The 48710 and 48722 are not intended for outdoor operation without protection. A
outdoor version suffix “A” is designed for that purpose. A central location is desired to provide
sementry in the distribution network. Further, stacking room near a riser for easy access to the roof
and other floors is desired. However, access to clean 110 VAC power is the only requirement.
Install directional donor antenna and aligned with desired base site.
Yagis, corner reflectors, and panel antennas work the best. Usually, the more directive the better.
The 48710 has sufficiniet filtering to prevent undesired signals from causing interference, however, it
is best to reduce the chance for interfernece by directing the mobile signals only towards the desired
donor base site.
Check the incoming signal before connecting. The 48710 will work with a wide range of RF input
signal levels. Ideal levels on the down link are in the range of –70 dBm. These levels will provide
the maximum output power while not causing significant ovedrive. Also check for extremely strong
out of band signals. These may overdrive the filtering and cause gain reduction.
Connect the donor antenna to the 48710 via 50 ohm coaxial cable.
Size and type of cable are a matter of choice. Typically ½” Flexwell foam coax is used, plenum rated
for inside buildings and work areas. However, 7/8
”
cable may be used to reduce the longitudinal loss.
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 buildings
with extensive obstructions it may be neccesary to install several service area antennas For assistance
with antenna placement contact RFS Applications Engineering. Observe MPE cautions when
determining the type and location of all antennas!
Connect service antenna(s) via 50 ohm coaxial cable
Multiple service area antenna(s)/radiating cable runs may be connected the 48710. Splitters and taps
may be used to accommodate unique distribution systems. RFS has all the components needed to
complete even the largest installations. See our Web Catalog at www.rfsworld.com
or call us.
Mount the 48710 Repeater upright, make sure there is sufficient space above and below the unit to
allow air to flow through the heat sink. Check to make sure the AC power cord can reach the power
source. Also provide adaquate bending room for the coxial cable.
Connect 50 ohm cables – donor antenna to “Base”, service antenna(s) to “Service”
Connect AC power to the 48710 and observe power and fault leds. The PM700-10 comes with each
unit. This connects to the 15 pin diagnotics din on the bottom of the unit either directly or via the 10
foot extension cable. The PM700-10 provides LED readouts of the PINs as explained in the
diagnostics/troubleshooting section. PIN outputs are TTL and DCV so a DVM can be used to
troubleshoot if needed.
Nintey percent of installations are trouble free. The typical problem with the other ten percent is the
signal is too weak or too strong on the downlink. See troubleshooting section for more information
A test of the installation should include multiple subscribers in various locations in the service area with
one subscriber always in the closest proximity to the repeater that will normally be allowed. This will
check to make sure that a close-in user does not overdrive the uplink and reduce coverage for other
users.
If there is an overdrive in either the up or down link, reduce path gain via the manual attenuator. Rotate
clockwise until the AGC overdrive indicator goes out.
7 48710-22Manual.doc
USER’S MANUAL
SERIES 48750 RF REPEATER
ANTENNA ISOLATION
ISOLATION BETWEEEN THE DONOR (BASE) ANTENNA AND SERVICE AREA ANTENNA
SHOULD BE 20 dB GREATER THAN THE GAIN OF THE REPEATER AMPLIFIER. If the isolation
is less than the amplifier gain, then positive feedback sufficient for oscillation is present in the system.
Such oscillations will overdrive one or both amplifier chains and continuously activate the AGC
auto-shutdown circuitry. This situation will be apparent by the Red Fault LED lighting up and then
quickly off every 2 seconds.
Antenna isolation is usally not a problem for in-building installations. Isolation is improved by using a
directive donor antenna and facing it away from the distribution or service antenna(s). Decoupling is
achieved by spatially separating the antennas vertically and/or horizontally. Other factors influencing
isolation include multi-path reflections, structures, other antennas, passing vehicles, personnel proximity,
etc. See applications engineering for assistance
It is always best to measure the isolation before connecting the repeater. The most direct way to measure
the isolation is to inject a known signal into one antenna, and measure the coupled signal at the other
antenna. This should be done across the applicable bandwidth to account for the frequency dependency
of standing waves.
DIAGNOSTICS / TROUBLESHOOTING
Green power LED not lit.
Check power source and the the AC fuse located in the EIC plug. Check for DC voltage. Is is rare that
the DC fuse will blow and most likely indicates a short of some kind in the repeater. The DC fuse is
accesable inside the unit. The Mini ATO 5 amp is a readily available fuse. It can be replaced, however, if
the fuse blows again, the unit should be return for service.
Green power LED lit and no Red Fault LED
If the green LED is on but the unit does not appear to be working, the mostly likely senario is a break in
the donor or distribution networks. First check both RF paths output via the DC voltages on Pins 12 and
13 or the RX DET.V and Tx DET. V from the PM700.
Also check to make sure that the donor signal is still available to the repeater, obstruction is blocking the
donor base site or the donor antenna has become misaligned. Then check the integrity of the distribution
network. Coaxial cable has a minimum bending radius, if that is exceeded the inner conductor may crack
or break causing excessive reflections to the signals.
Checking for DC Voltage
DC Voltage can be check via the 15 pin test port. Pins 10 and 11 are the DC voltage associated with the
AGC circuitry, there should be at least 7 volts to ground - pin 14. Or plug the PM700 monitor into the
test port and measure the RXAGCV to ground.
The Red LED indicates a summary fault from any of the fault conditions identified in the Test Points
section. Specific action is describe in that section.
TEST POINTS
TThhee DD--ssuubb ccoonnnneeccttoorr iiss llooccaatteedd oonn tthhee bboottttoomm ooff tthhee uunniitt.. TThhee PPMM770000 ppeerrffoorrmmaannccee mmoonniittoorr wwiillll pprroovviiddee
vviissuuaall rreeaaddoouutt oorr aa DDCC VVOOMM ccaann bbee uusseedd ttoo qquuiicckkllyy aasssseessss tthhee hheeaalltthh ooff tthhee 4488771100.. TThhee ffoolllloowwiinngg iiss tthhee
DD--ssuubb ppiinn--oouutt wwiitthh ttrroouubblleesshhoooottiinngg ssuuggggeessttiioonnss:: LLooookkiinngg aatt tthhee DDiinn ccoonnnneeccttoorr ffrroomm tthhee bboottttoomm ooff tthhee
uunniitt,, ppiinn nnuummbbeerriinngg ssttaarrttss uuppppeerr rriigghhtt aanndd pprroocceeeeddss rriigghhtt ttoo lleefftt ttoopp ttoo bboottttoomm..
8Dwg 602300003500/Rev.1 8
USER’S MANUAL SERIES 48710 RF REPEATER
11.. RRXX LLNNAA AAllaarrmm,, llooggiicc,, llooww == ffaauulltt
22.. TTXX LLNNAA AAllaarrmm,, llooggiicc,, llooww == ffaauulltt
33.. ––nnoott uusseedd
44.. ––nnoott uusseedd
55.. RRXX PPAA AAllaarrmm,, llooggiicc,, llooww == ffaauulltt
66.. TTXX PPAA AAllaarrmm,, llooggiicc,, llooww == ffaauulltt
CCoonnddiittiioonnss 11 –– 66.. RReemmoovvee aanndd rreeppllaaccee tthhee ffaauullttyy ccoommppoonneenntt oorr sseenndd tthhee rreeppeeaatteerr bbaacckk ffoorr rreeppaaiirr..
77.. TTeemmppeerraattuurree AAllaarrmm >>++8855°° CC,, llooggiicc,, llooww == ffaauulltt
CChheecckk ffoorr pprrooppeerr aaiirrffllooww ppaasstt hheeaatt ssiinnkk.. IIff tthhiiss ffaaiillss,, sseenndd uunniitt iinn ffoorr rreeppaaiirr..
88.. AAGGCC AAllaarrmm,, llooggiicc,, llooww == ffaauulltt
IInnddiiccaatteess oovveerrddrriivvee.. SSeeee AAGGCC sseeccttiioonn
99.. DDiissaabbllee ((iinnppuutt)),, llooggiicc,, hhiigghh == ddiissaabbllee
RReemmoottee ddiissaabbllee ffeeaattuurree.. CCoonnnneeccttiinngg ppiinn 1155 ttoo tthhiiss ppiinn wwiillll ddiissaabbllee tthhee 4488771100..
1100 RRxx AAGGCC VVoollttaaggee,, aannaalloogg,, nnoo AAGGCC aapppprrooxx.. 2266..55VVDDCC,, FFuullll AAGGCC aapppprrooxx.. 77..6655VVDDCC
1111 TTXX AAGGCC VVoollttaaggee,, aannaalloogg,, nnoo AAGGCC aapppprrooxx.. 2266..55VVDDCC,, FFuullll AAGGCC aapppprrooxx.. 77..6655VVDDCC
PPiinnss 1100 aanndd 1111 pprroovviiddee iinnddiiccaattiioonn ooff tthhee aammoouunntt ooff AAGGCC aatttteennuuaattiioonn.. FFuullll AAGGCC iinnddiiccaatteess ssttrroonngg
ddrriivvee ssiiggnnaall oorr ppoossssiibbllee oosscciillllaattiioonn aanndd sshhoouulldd bbee aavvooiiddeedd.. CChheecckk ddrriivvee lleevveellss aanndd aanntteennnnaa
iissoollaattiioonn.. RReedduuccee mmaannuuaall ggaaiinn ttoo rreellaaxx AAGGCC lleevveell iiff nneeeeddeedd..
1122 RRXX DDrriivvee VVoollttaaggee,, aannaalloogg,, aapppprrooxx.. 00 ttoo 33VVDDCC @@ aapppprrooxx.. 00..33VVDDCC ppeerr ddBB
1133 TTXX DDrriivvee VVoollttaaggee,, aannaalloogg,, aapppprrooxx.. 00 ttoo 33VVDDCC @@ aapppprrooxx.. 00..33VVDDCC ppeerr ddBB
PPiinnss 1122 aanndd 1133 pprroovviiddee aa DDCC vvoollttaaggee tthhaatt rreepprreesseennttss tthhee oouuttppuutt ppoowweerr ooff tthhee rreessppeeccttiivvee ppaatthh..
TThheessee lleevveellss ccaann bbee uusseedd ttoo ddeetteerrmmiinnee iiff tthheerree iiss ssiiggnnaall pprreesseenntt wwhheenn aa ssiiggnnaall mmeetteerr iiss nnoott
aavvaaiillaabbllee..
1144 GGrroouunndd ffoorr PPiinnss 1100,,1111,,1122,,1133..
1155 ++55VVDDCC,, tthheerrmmaallllyy ffuusseedd ((sseellff--rreesseettttiinngg)),, 5500mmAA mmaaxx..
PPiinn 1155 ccaann bbee uusseedd aass tthhee ddrriivvee vvoollttaaggee ttoo ddiissaabbllee tthhee uunniitt oonn PPiinn 99.. IItt iiss aallssoo uusseedd ttoo ppoowweerr tthhee
PPMM770000--1100 ppeerrffoorrmmaannccee mmoonniittoorr..
MAINTENANCE, REPAIR, AND WARRANTY
PERIODIC MAINTENANCE
There is no maintenance for the 48710. As long as the amplifiers are kept away from extreme
temperatures 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 tightness
and periodically check the AC power connections for integrity.
ORDERING & 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 at
1-800-321-4700 (602 252-8058 for Latin America) for a Return Authorization Number. Be prepared to
9 48710-22Manual.doc
USER’S MANUAL
SERIES 48750 RF REPEATER
provide the model number and serial number of the unit 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 the
package to:
Radio Frequency Systems
4100 S.W. Research Way
Corvallis, Oregon 97333
LIMITED WARRANTY
The Seller warrants that, at the time of shipment, the products manufactured by the Seller are free from
defects in material and workmanship. The Seller's obligation under this warranty is limited to
replacement or repair of such products within two years from date of shipment. No material is accepted
for replacement or repair without written authority of the Seller. Replacement or repair is made only after
an examination at the Seller's plant shows defective material or workmanship at the time of manufacture.
All shipping charges 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 nature
as a result of the use of the products manufactured by the Seller, whether used in accordance with
instructions or not. The Seller is not liable for replacement of any product damaged by lightning.
THIS WARRANTY IS IN LIEU OF ALL OTHERS, EITHER EXPRESSED OR IMPLIED. No
representative is authorized to assume for the Seller any other liability in connection with the Seller's
products.
10Dwg 602300003500/Rev.1 10
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