G Way Solutions SMR25W90 Bi-directional booster User Manual BDA SMR 1 25W 90 O REV1

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Date Submitted	2005-12-22 00:00:00
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INSTALLATION
AND
OPERATING MANUAL
FOR
BDA-SMR-1/25W-90-O
OUTDOOR REPEATER
TABLE OF CONTENTS
PARAGRAPH
PAGE NO
BDA OVERVIEW
BDA BLOCK DIAGRAM DESCRIPTION
OPTIONAL EQUIPMENT OVERVIEW
BDA BLOCK DIAGRAM DRAWING (Figure 1)
ELECTRICAL SPECIFICATIONS
MECHANICAL SPECIFICATIONS
ENVIRONMENTAL CONDITIONS
BDA CONNECTIONS
OPTIONAL EQUIPMENT OVERVIEW
MECHANICAL OUTLINE DRAWING (Figure 2 & 2a)
OPTIONAL BATTERY BACK-UP CONFIGUATION
(Figure 3)
RF EXPOSURE WARNING
BDA INSTALLATION
BDA OPERATION
VARIABLE GAIN ADJUSTMENT
ALC ADJUSTMENT
DIAGNOSTICS GUIDE
Page 2
10
11
12
13
14
14
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 SMR frequency
bands are as follows: 806-821 MHz for the Uplink and 851-866 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
Manual Gain Control (MGC) provides continuous control of amplifier gain. The use
of these controls is covered in the “OPERATION” section, later in this document.
Page 3
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.
Page 4
ELECTRICAL SPECIFICATIONS:
Frequency Range
Uplink
Downlink
: 806-821 MHz
: 851-866 MHz
Pass Band Gain @ min attenuation
: 90 dB (typ.)
Variable Step Attenuator Range
(2-dB steps)
: 0-30 dB
Pass band Ripple
: ±1.5 dB (typ)
20 dB Bandwidth
: 20 MHz
Noise Figure @+25°C at max gain
: 4.0 dB max.
3rd Order Intercept point
Uplink
Downlink
: +45 dBm (typ)
: +55 dBm (typ)
*Output Power @ 1dB Compression
Uplink
Downlink
: +32 dBm (typ)
: +44 dBm (typ)
*ALC Factory Set Point
Uplink
Downlink
: +25 dBm
: +35 dBm
Isolation between Up/Down Link
: 100 dB min.
Input/ Output Impedance
: 50 Ohms
VSWR (Input/Output)
: 1.5: 1 max.
Power Supply
: 110VAC/1.1 Amp
: 240VAC/0.55 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
3.5 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.
Page 5
MECHANICAL SPECIFICATIONS:
Size
: 16.0 x 12.0 x 8.75 inch
(406 x 305 x 222 mm)
Weight
: 35 Lbs. (16.0kg.) approx.
ENVIRONMENTAL CONDITIONS:
The unit is designed for outdoor applications:
Operating temperature: - 30°C to + 65°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.
A 7-pin circular connector provides failure alarm output contacts (see diagrams on
page 9) as well as a 12 VDC (250mA) auxiliary output. For OUA option: An AC
good alarm and DC good alarm are included. A TTL high is a non-alarm condition
and a TTL low is an alarm condition.
For S1 Option: The BDA is equipped with both AC and DC voltage inputs for power
operation. This gives the flexibility of powering the BDA with either an AC or DC
source. If both sources are connected, the BDA will automatically select the stronger
source for power. NOTE: (To insure that the DC source will be selected when both
sources are connected, DC input voltage must be at least 27 VDC.)
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 6
OPTIONAL EQUIPMENT OVERVIEW:
a.) Uninterruptible Power System (UPS) Option
An optional UPS is offered for systems that need emergency back-up power. The
system can easily be connected to a battery for uninterruptible operation. Not only
does the power supply power the load, but it also charges the battery. If the AC
power fails, the battery will uphold the load. In the event that the batteries voltage
drops below a safe level, a Low Voltage Battery Disconnect (LVBD) module will
disconnect the battery from the load. This will protect the battery from completely
discharging and prolong the life of the battery. Batteries can be supplied upon
request or a conventional battery configuration can be used (See Figure 3).
Two TTL alarms are included: “AC Good” and “DC Power Good”. A TTL high is a
non-alarm condition and a TTL low is an alarm condition. An optional emergency
shut down pin is available.
b.) DC Input Power Option (S1)
The BDA is equipped with both AC and DC voltage inputs for power operation. This
gives the flexibility of powering the BDA with either an AC or DC source. If both
sources are connected, the BDA will automatically select the stronger source for
power.
Page 7
Figure 2
OUT DOOR 25 WATT
REPEATER
or Battery
(OUA option only)
BDA Mechanical Outline
Figure 2a
Alarm Conditions
The alarm monitors current of both uplink and
downlink amplifiers. An alarm condition will
occur if either uplink or downlink amplifiers are (Relay Shown in Non-Alarm Condition)
over or under its current tolerance or if there is
no DC power present.
N.O.
COM.
N.C.
Page 8
Figure 3
Optional Battery Back-Up Configuration
15 Amp Fuse
12 Volt
12 Volt
Lead-Acid
Lead-Acid
Battery
Battery
15 Amp
+ Battery of
BDA
Battery
Back-Up Time
Recommend Battery
Rated Capacity
(20 Hour Rate)
Typical Current
Rating for BDAXXXX-1/25W-88
1 Hour
2 Hours
3 Hours
5 Hours
7 Hours
7.2 Amp Hours
12 Amp Hours
17 Amp Hours
28 Amp Hours
42 Amp Hours
3.5 Amps
3.5 Amps
3.5 Amps
3.5 Amps
3.5 Amps
Note: We do not guarantee specifications under Battery Back-Up power.
Page 9
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 outdoor antenna (Yagi type or similar directional antenna) must be
installed so as to provide a minimum separation distance of 0.35 meters (35 cm)
between the antenna and persons within the area. (This assumes a typical antenna
with maximum gain of [5 dBi, VSWR >?> 1.5:1, Zo= 50 ohms, and a cable
attenuation of between 1-10 dB)
The uplink outdoor antenna (Yagi type or similar directional antenna) must be
installed so as to provide a minimum separation distance of 0.35 meters (35 cm)
between the antenna and persons within the area. (This assumes a typical antenna
with maximum gain of [15 dBi, VSWR >?> 1.5:1, Zo= 50 ohms, and a cable
attenuation of between 1-10 dB).
Page 10
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 ALC
switches are in the “ON” position and attenuation is positioned to its
maximum setting (30 dB). After verification of ALC switches and attenuation,
follow the above steps starting with step 1.
Page 11
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 in the BDA contains an
ALC feedback loop (Figure 4). The ALC circuit senses the output power and limits it
to the factory preset level of +25 dBm on the Uplink and +35 dBm on the Downlink.
ALC function is selected with on/off toggle switches located on each amplifier and
accessible when opening the door on the BDA enclosure. A red indicator lamp
located on each amplifier illuminates when output power meets or exceeds the ALC
set point. The indicator is functional regardless of the position of the ALC switch.
Units are shipped with both ALC switches in the “ON” position. To ensure distortionfree operation limited to the set point, keep the ALC’s turned ON.
To establish proper operating gain on the Uplink and Downlink sides, start with the
Uplink. Verify that the ALC switch is in the “ON” position. Observe the red indicator
lamp on the Uplink amplifier. Units are shipping with maximum attenuation.
Decrease attenuation one step at a time until the lamp is lit. Then, using the Uplink
step attenuator, increase the attenuation until the lamp goes off. Repeat the process
for the Downlink. The level indicator is accurate to +/- 0.4 dB of the ALC set point.
Note: The recommended operation of the BDA is when the factory set ALC is
turned on. 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 BDA-SMR-1/25W-90-O at maximum gain with greater than
-45 dBm average power incident on the MOBILE port or greater than -35 dBm
average power incident on the BASE port can cause damage to the BDA.
Page 12
Figure 4
Variable Gain Adjustment Access
UPLINK
DOWNLINK
30
30
Up-Link MGC
Down-Link MGC
Alarm Board and
Down-Link ALC
Amplifier Status LEDs
Green LED-System OK
Red LED - Uplink Fail
Red LED - Downlink Fail
Down-Link HPA
Protected for Temperature
Protected for Overload
ALC ON
LED
Up-Link MPA
ALC circuit inside
Figure 5
ALC Adjustment Access
UPLINK
OFF
AL C
OFF
ON
DOWNLINK
ALC
Page 13
ON
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 and 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 SMR frequencies, the antenna isolation at 100 m
separation is about 71 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
Page 14

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Modify Date                     : 2005:12:20 17:16:32-05:00
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Format                          : application/pdf
Title                           : Microsoft Word - BDA-SMR-1!25W-90-O REV1 $.doc
Creator                         : Dino
Author                          : Dino

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