G Way Solutions PCS25W90 Bi-Directional Amplifier (Booster) User Manual Outdoor BDA 25 Watt Remote opt
G-Way Microwave / G-Wave Bi-Directional Amplifier (Booster) Outdoor BDA 25 Watt Remote opt
User Manual
INSTALLATION
AND
OPERATING MANUAL
FOR
RBDA-PCS-1/25W-90-A
INDOOR REPEATER
TABLE OF CONTENTS
PARAGRAPH PAGE NO
BDA OVERVIEW 3
BDA BLOCK DIAGRAM DESCRIPTION 3
FCC INFORMATION FOR USER 3
BDA BLOCK DIAGRAM DRAWING (Figure 1) 4
ELECTRICAL SPECIFICATIONS 5
FREQUENCY TABLE 6
MECHANICAL SPECIFICATIONS 7
ENVIRONMENTAL CONDITIONS 7
BDA CONNECTIONS 7
MECHANICAL OUTLINE DRAWING (Figure 2) 8
BDA INSTALLATION 9
RF EXPOSURE WARNING 9
BDA OPERATION 10
VARIABLE GAIN ADJUSTMENT (Figure 3) 11
BACK PANEL (Figure 4) 11
DIAGNOSTICS GUIDE 12
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BDA OVERVIEW:
The BDA assembly extends the coverage area of radio communications in buildings
and RF shielded environments.
The unit features low noise figure and wide dynamic range. It is based on a
duplexed path configuration with sharp out of band attenuation allowing improved
isolation between the receiving and transmitting paths.
BDA CIRCUIT DESCRIPTION:
Refer to figure 1 for the following discussion.
The BDA Downlink path receives RF signals from the base station and amplifies and
transmits them to the subscriber. The BDA Uplink path receives RF signals from the
subscriber and amplifies and transmits them to the base station. The Uplink and
Downlink occupy two distinct frequency bands. For example, the PCS/A frequency
bands are as follows: 1850-1865 MHz for the Uplink and 1930-1945 MHz for the
Downlink. Two diplexers isolate the paths and route each signal to the proper
amplifying channel.
A selectable Automatic Level Control (ALC) allows for output power limiting. A
variable step attenuator gives 0 – 30 dB of attenuation in 2 dB steps. The use of
these controls is covered in the “OPERATION” section, later in this document.
FCC INFORMATION for USER:
NOTE: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
¾ Reorient or relocate the receiving antenna.
¾ Increase the separation between the equipment and receiver.
¾ Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
¾ Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications not expressly approved by G-Wave, Inc. could void the
user’s authority to operate this equipment
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Figure 1
1. 2. 3.
6.
7.
4. 5.
BDA Block Diagram
1. Uplink Diplexer - has low bandpass insertion loss and high selectivity
2. Downlink Pre-amp - is a low noise amplifier that drives the Downlink PA and
offers 46dB Gain
3. Downlink PA – is a power amplifier with an ALC circuit which offers 43dB Gain
4. Uplink MPA – is a medium power amplifier with an ALC circuit which offers 43dB
Gain
5. Uplink Pre-amp - is a low noise amplifier that drives the Uplink MPA and offers
46dB Gain
6. Filters used on High-Gain Repeaters (90dB) to provide better isolation between
Tx & Rx frequencies and to aid the diplexer rejection.
7. Downlink Tx filter is enhanced for High Power applications, preventing arching
when the power amplifier approaches the 1dB compression point.
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ELECTRICAL SPECIFICATIONS:
Frequency Range : See Table
Pass Band Gain @ min attenuation : 90 dB (typ.)
Variable Step Attenuator Range : 0-30 dB
(2-dB steps)
Pass band Ripple : ±1.5 dB (typ)
Noise Figure @+25°C at max gain : 5.0 dB max.
3rd Order Intercept point
Uplink : +45 dBm (typ)
Downlink : +55 dBm (typ)
*Output Power @ 1dB Compression
Uplink : +33 dBm (typ)
Downlink : +44 dBm (typ)
*Maximum Output power per Carrier
Uplink Single Carrier : +25.0 dBm
Two Carriers : +20.25 dBm
Three Carriers : +18.25 dBm
Downlink Single Carrier : +37.0 dBm
Two Carriers : +33.25 dBm
Three Carriers : +30.25 dBm
Maximum Input power per Carrier @ Max Gain
Uplink Single Carrier : -55 dBm
Two Carriers : -60 dBm
Three Carriers : -62 dBm
Downlink Single Carrier : -43 dBm
Two Carriers : -47 dBm
Three Carriers : -50 dBm
Isolation between Up/Down Link : 105 dB min.
Input/ Output Impedance : 50 Ohms
VSWR (Input/Output) : 1.5: 1 max.
Power Supply : 110VAC/1.3 Amp
: 240VAC/0.60 Amp
: 50 to 60 Hz
*The Manufacturer's rated output power of this equipment is for single carrier operation. For situations
when multiple carrier signals are present, the rating would have to be reduced by minimum of 3.75
dB, especially where the output signal is re-radiated and can cause interference to adjacent band
users. This power reduction is to be by means of input power or gain reduction and not by an
attenuator at the output of the device. (See above table for multiple carrier signal output power
ratings)
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Table 1
Frequency
Band Downlink
Frequency
Ranges
Uplink
Frequency
Ranges
PCS A 1930-1945 MHz 1850-1865 MHz
PCS B 1950-1965 MHz 1870-1885 MHz
PCS C 1975-1990 MHz 1895-1910 MHz
PCS D 1945-1950 MHz 1865-1870 MHz
PCS E 1965-1970 MHz 1885-1890 MHz
PCS F 1970-1975 MHz 1890-1895 MHz
* Other contiguous or non contiguous blocks are available upon request (Example: PCS AD,
PCS EF…, AC, BE etc)
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MECHANICAL SPECIFICATIONS:
Size : 19.0 x 13.0 x 5.25 inch
(483 x 330 x 133 mm)
Weight : 30 Lbs. (13.6kg.) approx.
ENVIRONMENTAL CONDITIONS:
The unit is designed for outdoor applications:
Operating temperature: - 20°C to + 50°C
Storage temperature: - 50°C to + 90°C
BDA CONNECTIONS
The BDA AC power is accepted through a 3-wire male plug with phase, neutral and
ground leads. The AC power is wired to a high efficiency DC switching power supply
which is CE and UL approved. The power supply runs the amplifiers and the Power-
On lamp. The metal enclosure of the BDA is connected to ground.
An optional 7-pin circular connector provides failure alarm output contacts as well as
a 12 VDC (250mA) auxiliary output.
The RF connections are made via two type “N” female connectors. The RF
connector labeled “BASE” must be connected to the antenna pointing towards the
base station. The RF connection labeled “MOBILE” must be connected to the
antenna facing the area to be covered by the BDA.
The RF connections must be made through cables with characteristic impedance of
50 ohms.
The isolation between the base station antenna and the mobile antenna should
be at least 12 dB higher than the BDA gain. Isolation less than this value can
cause gain ripple across the band. Isolation equal to or less than the BDA gain
will give rise to oscillations which will saturate the amplifiers and possibly
cause damage to the BDA.
Page 7
Figure 2
UPLINK
Gain Adjustment
0...30 dB
BASE
PCS/A
IN BUILDING REPEATER
Gain Adjustment
DL
ALARM ALC UL
ALC DL ALARM
UL
DOWNLINK
0...30 dB
POWER
GND
MOBILE
BDA Mechanical Outline
Page 8
OUTDOOR BDA INSTALLATION PROCEDURE
IMPORTANT: DO NOT APPLY A.C. OR DC POWER TO THE BDA UNTIL
CABLES ARE CONNECTED TO BOTH PORTS OF THE BDA AND THE
ANTENNAS.
1. Mount the BDA on the structure with the RF connectors pointing DOWN. Using
appropriate screws and anchors, attach the BDA to the structure using the six
mounting holes on the side flanges.
2. Ensure that the isolation between the donor antenna and the service antenna is at
least 12 dB greater than the BDA gain. (Use the higher of the Uplink and
Downlink gains reported on the BDA test data sheet).
3. Connect the cable from the donor antenna to the BDA connector labeled “BASE”
and the cable from the service antennas to the BDA connector labeled “MOBILE”.
4. Open the access door on the BDA and verify that the Uplink and Downlink ALC
switches are in their factory preset “ON” positions and attenuation is positioned to its
maximum setting.
5. Connect the AC power cord to the BDA and then to the power source. Turn the
power switch to its “ON” position. Verify that the “Power On” indicator is lit. Close the
access door.
Installation of the BDA is now complete. To adjust the gain controls to suit the
specific signal environment, refer to “Outdoor BDA Operation”.
Note: For repeat installations of existing equipment, make sure the attenuation is
positioned to its maximum setting (30 dB). After verification of the attenuation, follow
the above steps starting with step 1.
RF EXPOSURE WARNING
The antenna used for this transmitter must be fixed-mounted on outdoor permanent
structures. In order to satisfy the FCC RF exposure requirements, the BDA/antenna
installation must comply with the following:
The downlink indoor antenna (Omni type or similar antenna) must be installed so as
to provide a minimum separation distance of 0.36 meters (36 cm) between the
antenna and persons within the area. (This is calculated with an antenna that has a
maximum gain of [5 dBi, VSWR >?> 1.5:1, Zo = 50 ohms, and a cable attenuation of
between 2-10 dB)
The uplink outdoor antenna (Yagi type or similar directional antenna) must be
installed so as to provide a minimum separation distance of 0.29 meters (29 cm)
between the antenna and persons within the area. (This is calculated with an
antenna that has a maximum gain of [15 dBi, VSWR >?> 1.5:1, Zo= 50 ohms, and a
cable attenuation of between 2-10 dB).
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BDA OPERATION
Variable Step Attenuator
BDA gain can be reduced by up to 30 dB in 2 dB steps using the variable step
attenuator (Figure 3). Gain adjustment is made with rotary switches accessible via
the access door on the BDA enclosure. Arrows on the shafts of these switches point
to the value of attenuation selected. BDA gain can be determined by subtracting the
attenuation value from the gain reported on the BDA Test Data Sheet for that side of
the unit. The attenuators are labeled for Uplink and Downlink.
ALC (Automatic Level Control)
To minimize intermodulation products, the Uplink amplifier and the Downlink
amplifier in the BDA contain an ALC feedback loop (Figure 5). The ALC circuit
senses the output power and limits it to the factory preset level of +25 dBm on the
Uplink and +37 dBm on the Downlink.
The ALC function has a red indicator lamp located on Panel adjustment (See Figure
5), the LED’s illuminate when output power meets or exceeds the ALC set point.
To establish proper operating gain on the Uplink and Downlink sides, start with the
Downlink. Observe the red indicator lamp on the Downlink panel. Units are shipping
with maximum attenuation. Decrease attenuation one step at a time until the lamp is
lit. Then, using the Downlink step attenuator, increase the attenuation until the lamp
goes off. Repeat the process for the Uplink. The level indicator is accurate to +/- 0.4
dB of the ALC set point. Note: Operation of the BDA in the alarm condition will
void the warranty, and output power should be immediately reduced using the
variable step attenuator.
Operation of RBDA-PCS-1/25W-90-A at maximum gain with greater than -50
dBm average power incident on the MOBILE port or greater than -40 dBm
average power incident on the BASE port can cause damage to the BDA.
Page 10
Figure 3
Variable Gain Adjustment Access
Downlink ALC & Alarm LED’s U
p
link ALC & Alarm LED’s
0
30
UPLINK
0
30
DOWNLINK
Power Switch
& Indicator
Figure 4
Back Panel
AC Line IN
BASE & MOBILE
Connectors Ground Lug
Page 11
DIAGNOSTICS GUIDE
The BDA provides long term, care-free operation and requires no periodic
maintenance. There are no user-serviceable components inside the BDA.
This section covers possible problems that may be related to the installation or
operating environment.
a. Gain Reduction
Possible causes: Bad RF cables or RF connections to antennas, damaged
antennas.
b. Excessive Intermodulation or Spurious
Possible causes:
Amplifier oscillation caused by insufficient isolation. The isolation between two
antennas is given by the equation:
Isolation = 92.5 + 20 Log (F x D) – Gt – Gr
Where:
F = frequency (GHz)
D = separation (Km)
Gt = transmit antenna gain (in the direction of the receive antenna).
Gr = receive antenna gain (in the direction of the transmit antenna).
For example, at the PCS frequencies, the antenna isolation at 100 m separation is
about 78 dB for omni-directional antennas (0 dB gain). To increase isolation, the
antennas should have higher directivity and must be pointed away from each other.
c. Occasional Drop-out of some Channels
Possible causes: One channel with very strong power dominates the RF output of
the amplifier.
38 Leuning Street
South Hackensack, NJ 07606
Tel. 201-343-3140 Fax 201-343-6390
sales@gwaverf.com
www.gwaverf.com
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