FCC ID: O IW CBDASMRPS8
INST ALLATION AND OPE RATING INS TRUCTIONS
The f ollowing is a cop y of In stallat ion and Oper ating Instru ctions of th e MWCBD A-SMR-1W60PS-8 Cell ular Bi- Dir ec tional Amplifier /Boost er .
Page 1 of 11
FCC ID: O IW CBDASMRPS8
INSTALLATION
AND
OPERATING INSTRUCT IONS
FOR
MW-CBDA-SMR-1W60PS-8
BI- DIRE C TIONAL AMP LIFIER
(COM PACT BDA)
Page 2 of 11
FCC ID: O IW CBDASMRPS8
TABLE OF CONTENTS
PARAGRAPH PAGE NO
BDA OVERVIEW 4
BDA BLOCK DIAGRAM DESCRIPTION 4
BDA BL OCK DIAGRAM DRAWING 5
ELECTRICAL SPECIFICATIONS 6
MECHANICAL SPECIFICATIONS 7
ENVIRONMENTAL CONDITIONS 7
BDA CO NNECTIONS 8
PERIODIC MAINTENANCE 8
DIAGNOSTIC GUIDE 9
MECHANICAL OUTLINE 10
RF EXPOSURE WARNING 11
Page 3 of 11
FCC ID: O IW CBDASMRPS8
BDA OVERVIEW:
The BDA assembly provides an exceptional repeater/booster
performances to extend the coverage area of radio
communications in buildings and RF sh ielded environments.
Features such as high linearity power amplifiers are contributing
for t h e o veral l im p roved s yst em li n ear ity p e rfor m anc es. Th e un it is
based on a duplexed path configuration, having sharp out of band
attenuation for improved isolation between the receiving and
transmitting paths.
BDA BLOCK DIAGRAM DESCRIPTION:
The B DA Do wnli nk p ath recei ves t h e RF sig n als from b as e s tat i on
amplifies and transmits them to the subscriber. The BDA Uplink
path receives the RF signals from the subscriber amplifies and
transmits them to the base station. Two duplexers frequency
separat e the sig nals to the prop er amplifying p ath and isolate t he
two signals.
BDA with AGC (Option A)
The amplifiers in this B DA have an AGC feedb ack loop. The AG C
circuit senses the output power and when it exceeds the preset
level of +20 dBm it introduces more attenuation. In th is manner the
gain of the amplifier is reduced, its output power is limited to +20
dBm and the Intermodulation products are kept low.
The AGC Dynamic range is 30 dB.
Page 4 of 11
FCC ID: O IW CBDASMRPS8
MGC
AGC RF AMPLIFIER
AGC CIRCUIT
DETECTER
TO
BASE
STATION
ANTENNA
(N-TYPE)
Duplexer
DETECTER
AGC CIRCUIT
COUPLER
AGC RF AMPLIFIER
COUPLER
Downlink
Duplexer
MGC
Uplink
TO
AREA
ANTENNA
(N-TYPE)
BDA BLOCK DIAGRAM
MW-CBDA-SMR-1W60PS-8
Page 5 of 11
FCC ID: O IW CBDASMRPS8
ELECTRICAL SPECIFICATIONS :
Frequency Range
Passban d Gain @ m in attenuation : 60 dB minimum
Passban d Rippl e
Noise Figu r e @+ 25
3rd Order Intercept point : +45 dBm typical
IMD @2 tone @+20 dBm/carrier : 50 dBc typical
Isolation between Up /Down Link : 70 dB min
Impedan c e Level : 50 O hms
VSWR In : 1. 5 : 1 max
Power Sup ply : 80 t o 240 V AC;
°C at max gain
: Up Link : 806 – 824 MHz
: Down Link : 851 – 869 M Hz
: ±1.5 d B typical
: 6. 0 dB max
50 to 60 Hz; @500 m A
Page 6 of 11
FCC ID: O IW CBDASMRPS8
MECHANICAL SPECIFICATIONS:
Size : 9.84 x 9.61 x 4.53 inch
(250 x 244 x 115 mm)
RF Connectors : N-type Fema le
Weight : 10 Lbs. (5kg.) approx.
ENVIRONMENTAL CONDITIONS:
The unit is designed for indoor applications:
Operatin g temperature : - 30°C to + 5 0°C
Storage temperature : - 50°C to + 9 0°C
Page 7 of 11
FCC ID: O IW CBDASMRPS8
BDA CONNECTIONS
The BDA AC power is supplied through a standard 3-wire male
plug with phase, neutral and safety ground wires. The AC power is
only used to supply a high efficiency DC switching power supply.
The two amp lifiers (Up link and Down link) an d the P owe r On lamp
use only DC power.
The RF connection is made via two type “N” female connectors.
The RF connector labeled “Base” must be connected to the
antenna pointing to the base station. The RF connection labeled
“Mobile” m ust be c onnec ted t o th e anten na poin ting in to the ar ea
to be covered by th e BDA.
The connections must be made through 50 ohms impedance
cables.
The isolation between the base station antenna and the mobile
ant enn a s hou ld be at leas t 12 dB h igher t han the BD A gai n. If t he
isolation were less than the BDA gain, oscillation would start and
would saturate the amplifier. Isolation few dB higher than the BDA
gain cannot start oscillations but would causes gain ripple in the
band.
PERIODIC MAINTENANCE
The BDA should provide long term, care free operation with no
need of any periodic maintenance.
The BDA has no user adjustments or alignments.
The front panel lamp indicates power supply turn on.
Page 8 of 11
FCC ID: O IW CBDASMRPS8
DIAGNOSTICS GUIDE
As mentioned before the BDA should provide long term, care free operation
with no need of any periodic maintenance. This section will cover possible
pr oblems that may sh ow up after in stallation.
a. Gain Reduction
Possib le caus es: Bad RF cabl es and RF conn ection s to antenn as, Damag ed
antennas.
b. Exce ssive Intermodulation or Spurious
Possible causes:
Amplifier os c ill ation c aused by insuf ficien t isolation. The isolation between two
antennas is given by the equation:
Isolation = 92.5 + 20 Log ( F x D ) – Gt – Gr
F is frequency in GHz
D is sep ar ation in Km
Gt is the trans m it antenna gain (at the direction of th e r ec eiv e antenn a) .
Gr is the receive antenn a gain (at the direct ion of the trans m it antenna).
For exampl e at t h e SMR frequ en cy th e antenn a isol ation at 100 m sep arat ion
is about 71 dB for omni antennas (0 dB gain). To increase isolation the
antennas should have higher directivity and must be pointed away from each
other.
c. Occasiona l Dr op-out of som e Channel s
Possible causes: One channel with very strong power dominating the RF
output of the ampl ifier.
Page 9 of 11
FCC ID: O IW CBDASMRPS8
MECHANICAL OUTLINE
Page 10 of 11
FCC ID: O IW CBDASMRPS8
RF EXPOSURE WARNING:
In order to satisfy the FCC RF exposure requ irements, you must ensure that
the installation complies wit h the following:
One antenna is connected via cable that has 3~10 dB attenuation (d epend s
on the length of th e c able) t o the CBDA BASE por t. Th is antenna is installed
outdoor and has very sharp beam (Yagi typ e or s im ilar) pointed to the donor
(BTS). This typ e of antenna has ab out 10 dB i gain. Typical specif ic ations :
(model ASPD2996): gain : 8dBd ( = 10.1dB i) , VSWR: better than 1.5: 1 ,
Impedan c e: 50 ohm , F /B ratio: 18 dB, E -pl ane Beamwidth: 47deg., H-plane
Beamwidth: 58 deg. You mu s t maintain a minimum distanc e of 0.3m from the
outdoor antenna to people within the ar ea.
The sec ond antenna is c onn ec ted via cable that has 2~ 6 dB attenu ation
(d epend s on the length of th e c able) t o the CBDA MOBILE port . This type of
antenna is omnidirectional (isotropic) with 0 to 2 dBi gain and is installed and
distributes indoor (in buildings, tunnels, basements, park lots, shopping
centers etc.). This antenna is installed usually on the ceiling. Typical
sp ec ifications: ( K athr ein m odel No. 741 572) : gain: 2dBi, VSW R: bett er than
2:1 , Imped ance: 50 ohm, Polarizat ion: Vert ic al. Y ou must maintain a minimum
dis tanc e of 0.1m from the indoor antenna to peopl e within the area.
Page 11 of 11
Loading...