Andrew PCSSSR1900 PCS repeater model PCSSSR1900 User Manual PCS SSR INSTALLATION

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Document ID	137876
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Date Submitted	2001-02-23 00:00:00
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Creation Date	2001-02-14 17:10:20
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Document Title	PCS SSR INSTALLATION.PDF
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Document Author:	TTidwell

INSTALLATION & OPERATION MANUAL FOR THE BETA
MODELS OF THE PCS SSR
Contents:
1.0 Description
1.1 Physical Configuration
1.2 Electronic Description & Block Diagram
1.3 Operational Environment
2.0 Installation Guide lines
2.1 Location
2.2 Mounting
2.3 Power Supply
3.0 Operation Guide Lines
3.1 Power / Interface Circuit Board
3.2 Stability
Appendix A:
PCS Frequency Band and Blocks
Appendix B:
Specifications
Appendix C:
Gain Adjustment
1.0 Description
WARNING: This device complies with CFR 47, Part 24 of the FCC rules.
Any modification not expressed approved by the manufacturer could
invalidate the user's authority to operate the device.
1.1 Physical Configuration
Figure 1 is an illustration of the 18” PCS Side to Side Repeater (SSR) indicating
important features; Figure 2 is an illustration of the 12” SSR. As shown in the
illustrations both SSRs have a square shape with rounded corners; both units have the
same physical thickness (approximately 2”). The 18” unit weighs approximately 14.5
pounds; the 12” unit approximately 8 pounds. The 2” wide edge of both units contain
4 deep grooves separated by fins; this structure is an important electrical feature and
must be keep free of extraneous material. Likewise, the central 8” square area on
each face is electrically active and must be kept free of contaminating materials.
Take special note that each face of the SSR has a unique electrical function and must
properly oriented in operation (see section 2.0). The illustrations show the SSR
without the radomes normally attached to each face. When attached the radome with
the Andrew flash indicates which side should be facing the handset (mobile unit).
1.2 Electronic Description & Block Diagram
The 1900 series PCS repeaters operate in the 1900 MHz PCS band. They were
developed to provide more reliable coverage and/or range extension of PCS systems
within sheltered structures. Specific models for each of the major US PCS sub-bands
( A, B, C, D, E & F) are offered. Pre-aligned antennas on each side of the repeaters
make them easy to install and simple to operate. Designed for indoor environments,
they only require a standard US 110VAC outlet for operating power. All three
popular PCS systems (TDMA, CDMA & GSM) are supported.
Figure 3 is an electronic block diagram of SSR internal and external circuitry.
Separate antennas provide receive and transmit functions for the complementary
uplink and downlink bands. In operation, the appropriate receive antenna feeds its’
signal to a band pass filter that functions to reject undesired signals and isolate the
complementary band’s signal. The signal from the band pass filter feeds an amplifier
with an AGC loop that limits maximum output power to approximately 100
milliwatts. The amplifier output feeds a second band pass filter functioning to limit
spurious amplifier output signals and further isolate the complementary band’s signal.
The complementary band’s signal path is identical to that previously described,
except in the reverse direction. Both amplifiers include crude RSSI circuitry and
over-current protection circuitry.
1.3 Operational Environment
The SSR has been designed to operate properly in a temperature and humidity
controlled indoor environment. Operation in environments where the ambient
temperature is outside the 50o-85o F range or the relative humidity is greater than 50%
may result in unsatisfactory performance. Exposure to temperatures outside the 10o120o F range or relative humidity greater than 80% may result in permanent damage
to the unit.
2.0 Installation Guide Lines
2.1 Location
CAUTION: In order to comply with FCC rules for rf exposure, the following must
be observed:
The antenna must be installed such that a minimum separation distance of 20 cm. is
maintained between the antenna and any persons.
Proper operation of the SSR cannot be achieved if the following installation location
guide lines are not followed.
The prevention of signal feedback from the transmit antenna on one side of the SSR
to the same path’s receive antenna on the opposite side of the SSR is paramount to
proper operation of the SSR. Any matter in the surrounding environment of the SSR
will produce undesirable feedback signals. Any object with any physical dimension
that is greater than 2 inches may cause undesirable signal reflections and/or
refractions severe enough to cause unstable operation of the SSR. Metal objects
normally cause worse reflections and/or refraction than non-metallic objects. The
level of undesired reflected and/or refracted signals is directly proportional to the size
of the object and inversely proportional to the distance between the SSR and the
reflecting/refracting object. Obviously, a perfect “free space” environment for the
SSR is the ideal location, but not practical. However, a major goal of the operating
location selection process is to find a place that approximates a “free space”
environment as closely as possible.
A location that provides a “clear” communication link with a suitable base station
signal using a typical handset is also required for proper operation of the SSR. Base
station signal level at various candidate locations should be measured using the RSSI
on a handset or more precise instrumentation. Experience indicates that a location
with the highest base station signal level that is free of any object within a 15-20 feet
radius hemisphere centered on one side of the SSR should provide suitable SSR
operation.
2.2 Mounting Considerations
Mounting should be accomplished with due consideration of the minimization of
undesirable feedback signal discussed in section 2.1. Early product development
testing used 50 lb. braided nylon cord and small “S” hooks to hang the SSR four or
more feet below a convenient overhead structural member (see Figure 4). Mounting
devices made of non-conductive, low dielectric constant and/or high loss tangent
materials attached to any edge that minimally blocks the grooves between the fins on
the edges may be used to mount the SSR.
2.3 Power Supply Location & Connections
The power supply furnished with the SSR requires a standard US 110 VAC outlet. It
connects to the SSR via a permanently attached two-conductor cable with a special
polarized connector and RF absorbing material on approximately 18” of length
adjacent to the SSR. The location of the power supply also requires special attention
to the minimization of undesirable feedback signals. The recommended location is as
near the plane that bisects the SSR around the finned edge as possible and as far away
from the SSR as possible.
3.0 Operation Guide Lines
3.1 Power / Interface Circuit Board
All controls and indicators for the SSR are mounted on the power / interface circuit
board (PWR I/F); which is mounted in one of grooves between the edge fins (see
Figures 1 & 2). The four small LEDs mounted on the PWR I/F provide the following
information:
Green LED at edge of PWR I/F most distant
from power connector.
On state indicates that SSR is receiving power
from the power supply and the internal circuitry
has not exceeded the maximum safe current
demand.
Off state (concurrent with an off state for the
adjacent Red LED) indicates that the SSR is not
receiving power from the power supply.
Red LED adjacent to Green Power LED
described above.
Green LED nearest power connector.
Green LED next in line away from power
connector.
On state indicates an internal over current event
has occurred. Power to the SSR must be
interrupted for 10 or more seconds to reset this
“circuit breaker” function. Repeated resets
(more than 3 times in 30 minutes) may cause
permanent damage to SSR.
Off state (with concurrent on state of power
LED) indicates normal SSR operation
RSSI for the down link (signal received from
the base station and re-transmitted to the
handset). On state indicates reception of a
useable signal from the base station.
RSSI for the up link (signal received from the
handset and re-transmitted to the base station).
On state indicates reception of a useable signal
from the handset.
3.2 Stability
After mounting the SSR in a location selected using the guidelines of section 2.0 and
connecting the power supply stable operation must be confirmed. If stable operation
in the selected location cannot be achieved, either another stable location must be
found or the gain of the SSR must be reduced (see Appendix C).
A good way to confirm stable operation is by use of a spectrum analyzer and a
suitable pick-up antenna. Locate the spectrum analyzer and pick-up antenna outside
the 15-20 feet clear field hemisphere of the SSR, adjust the analyzer controls to
display signals in a 150 MHz band centered on the operating band of the SSR (see
appendix A), and set the analyzer bandwidth, attenuation, and sweep parameters to
provide –90 to –100 dBm measurement sensitivity. Turn off the SSR by removing
its’power cable; while viewing the analyzer display, turn the SSR back on and watch
for spurious signals that change amplitude and frequency in a random manner. The
presence of such randomly changing signals is a strong indication of an unstable SSR.
With a normally operating SSR you should be able to see the base station down link
signal and this signal should increase in amplitude when the SSR is turned on (See
Figure 5).
If a spectrum analyzer is not available, a less certain but useful way to confirm
satisfactory operation is to make a phone call using a hand set that operates in the
same band as the SSR. The audio quality is usually badly garbled and distorted when
the SSR is operating in an unstable manner.
Figure 1. 18” Side to Side Repeater
Figure 2. 12” Side to Side Repeater
Figure 3. Side to Side Repeater Block Diagram
Figure 4. Typical SSR Installation Mounting
Figure 5. Example of Spectrum Analyzer Display of Base Station Signals for
Stable Operation of the SSR
APPENDIX A.
PCS Frequency Band and Blocks
Band/Block Channel Numbers
0-299
300-399
400-699
700-799
800-899
900-1199
Mobil Station Transmit
Frequency (MHz)
1850-1865
1865-1870
1870-1885
1885-1890
1890-1895
1895-1910
Base Station Transmit
Frequency (MHz)
1930-1945
1945-1950
1950-1965
1965-1970
1970-1975
1975-1990
APPENDIX B:
Specifications
Common to all Models:
Model 1900-xxx
Rx Freq (MHz)
Rx NF
Tx Freq (MHz)
Tx Pwr
ACPR
Power @110VAC
Temp Range
Rx/Tx Active Gain
Size
Weight
Rx/Tx Active Gain
Size
Weight
-12A & -18A
-12B & -18B
1850-1865
1870-1885
1930-1945
-12C & -18C
-12D & -18D
-12E & -18E
-12F & -18F
1895-1910 1865-1870 1885-1890
5.5 dB Max
1950-1965 1975-1990 1945-1950 1965-1970
+20 dBm typical; +21 dBm Max
-50 dB Min @ ±885 kHz
20 watts Max
50 to 85 oF
Common to all 12” Square Models:
45 dB min
12” X 12” X 2” less Power Supply
8-1/2 lbs less Power Supply
Common to all 18” Square Models:
50 dB min
18” X 18” X 2” less Power Supply
14-1/2 lbs less Power Supply
1890-1895
1970-1975
APPENDIX C:
Gain Adjustment
The small multi-turn potentiometers (pot) visible on the edge of PWR I/F board between the
power connector and the row of LEDs may be adjusted to reduce the electronic gain of the
SSR (see illustration below). Keep in mind that proper location of the SSR is the best way
stabilize the SSR. Gain reduction will drastically reduce the range over which the SSR can
provide signal improvement. Rotation of the adjustment screw clockwise will reduce the
gain of the SSR. Adjustment sensitivity is approximately 1 dB per turn in the mid range of
the pot. The pots have a slip-clutch action at each end of their range to preclude accidental
damage during adjustment to the desired setting.

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Creator                         : Microsoft Word - PCS SSR INSTALLATION.doc
Create Date                     : 2001:02:14 17:10:20
Title                           : PCS SSR INSTALLATION.PDF
Author                          : TTidwell
Producer                        : Acrobat PDFWriter 3.03 for Windows NT
Subject                         : 

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