Andrew PCS1900 Repeater User Manual PCS 1900 INSTALLATION
Andrew Corporation Repeater PCS 1900 INSTALLATION
Andrew >
Manual
INSTALLATION & OPERATION MANUAL FOR THE MODEL PRB-1900-xx “PROPAGATOR” INDOOR PCS BAND REPEATERS Contents: 1.0 Regulatory & Safety Information 1.1 FCC Warning Statement 1.2 Safety Considerations 2.0 Equipment Description 2.1 Physical Configuration 2.2 Electronic Description & Block Diagram 2.3 Operational Environment 3.0 Installation Guide lines 3.1 Location 3.2 Mounting 3.3 Power Supply 4.0 Operation Guide Lines 4.1 Power / Interface Circuit Board 4.2 Stability Appendix A: PCS Frequency Band and Blocks Appendix B: Specifications Appendix C: Gain Adjustment 1.0 Regulatory & Safety Information 1.1 FCC Warning Statement WARNING: This device complies with CFR 47, Part 24 of the FCC rules. Any modification not expressly approved by the manufacturer could invalidate the user's authority to operate the device. 1.2 Safety Information CAUTION: In order to comply with FCC rules for Radio Frequency Exposure, the following must be observed: The PROPAGATOR must be installed such that a minimum separation distance of 1.25” (3 cm.) is maintained between each antenna face (the large white plastic 15” X 15” surfaces on each side of the chassis) and any persons. 2.0 Equipment Description 1.2 Physical Configuration Figure 1 is an illustration of the PCS-1900-xx “Propagator” Repeater (hereafter referred to as the SSR) indicating important features. As shown in the illustration there is a main electronics housing (chassis) that has a square shape with rounded corners. The chassis is attached to a mounting base that incorporates an azimuth rotation feature with detents. The approximate size of the chassis is 15” X 15” X 4”; the corners have a 3” radius. The mounting bracket has a base that is approximately 9” X 3.75” X 0.75” that positions the chassis approximately 3.25” away from its mounting surface. The unit weighs approximately 8.75 pounds without the power supply. A separate, AC wall outlet mounted, DC power source is provided. This unit is approximately 3.75” X 2” X 1.25” in size and weighs approximately 0.8 lbs. A white plastic radome covers each 15” X 15” face of the chassis; these surfaces are electrically active and must be kept free of contaminating materials. Also, 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 radome with the Andrew flash indicates which side should be facing the handset (mobile unit). 1.3 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. Three models cover all US PCS sub-bands (AD, BE, & FC). 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. The design employs high linearity amplifiers that work well with all popular signal formats (TDMA, CDMA, GSM, etc.). Figure 2 is an electronic block diagram of SSR internal and external circuitry. A full band internal antenna on the base station face of the SSR (donor antenna) feeds a highly selective diplexer functions to separate and isolate the uplink (Tx) and downlink (Rx) signal paths. A different internal full band antenna and diplexer on the mobile face of the SSR function in a complementary manner to separate and isolate the uplink (Rx) and downlink (Tx) signal paths. The signal from each diplexer’s Rx filter feeds an amplifier with an AGC loop that limits maximum output power to approximately 4 milliwatts. The amplifier RF outputs feed the complementary TX band pass filter in each diplexer which functions to limit spurious amplifier output signals and further isolate the complementary band’s signal. Both amplifiers include Received Signal Strength Indicator (RSSI) circuitry and overcurrent protection circuitry. 1.4 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 30o -105o F range or the relative humidity is greater than 50% may result in unsatisfactory performance. Exposure to temperatures outside the 10o -120o F range or relative humidity greater than 90% may result in permanent damage to the unit. 2.0 Installation Guide Lines 2.1 Location 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 when 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 hemisphere of 15-20 foot radius centered on one side of the SSR should provide suitable SSR operation. Figures 3 thru 5 show typical installation locations that have been found to provide a stable operating environment for the SSR. Figure 3 is the preferred installation location: on or very near an exterior window. Extensive testing has show that when mounted directly on the surface of the window glass of an exterior window well above the floor (8’minimum) the SSR operates in a stable fashion for both gain settings if the area outside the window is free of signal reflecting objects within a 40 foot radius. If mounted near but not on the surface of the glass the 73 dB system (50 dB active) gain setting is recommended for maximum stability margin. Figure 4 is the next best installation location: mounted on an interior wall surface of typical gypsum wallboard (drywall) construction about 7 or 8 feet off the floor but not too close to the ceiling. Be careful to position the SSR between metal studs in the wall if present. Extensive stability testing has shown this mounting location to provide stable operation for both gain settings of the SSR. Figure 5 show a third acceptable installation location: mounted on the ceiling or on extension poles of 1’or 2’lengths. The 73 dB system (50 dB active) gain setting has been show to provide stable operation for all ceiling mount configurations. The 83 dB system (60 dB active) gain setting is only recommended for the 2’extension pole configuration. When using the extension pole configurations the SSR must be keep well above floor level (at least 8’). When mounted to a ceiling it may be desirable to point the Propagator in a different direction. The mounting base has a built-in detent rotation feature that allows the main electronics chassis to be rotated ± 47 degrees about its vertical axis. Simply pull down on the mounted Propagator and rotate to a new detent position. Table 1 summarizes the stability rating verses mounting location with gain setting as a parameter. 2.2 Mounting Considerations Mounting should be accomplished with due consideration of the minimization of undesirable feedback signal discussed in section 2.1. The mounting base along with its companion mounting plate provide for a wide variety of structural attachment methods when installing the SSR. The polarization of the base station facing antennas in the SSR strongly favors attachment of the mounting base to a horizontal surface above or below the SSR. Standard fastening techniques can be used to attach the aluminum mounting plate shown in Figure 6 to the desired horizontal surface. Once the mounting plate is securely attached to the mounting surface the SSR is attached to the threaded studs on the mounting plate using the provided nylon thumbnuts (see Figure 7). 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. 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 Status Indicating Light Emitting Diodes (LEDs) Four small status indicating LEDs are visible on the Mobile unit facing side of the SSR; they provide the following information (see Figure 1): Green LED nearest the mounting base. Red LED adjacent to Green Power LED described above. Green LED adjacent to red LED described above. Green LED near the edge of the SSR opposite the green Power described above. 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. 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. If the subject SSR is set at the 60 dB active gain level (83 dB system gain) it may be possible to achieve stable operation by setting the gain of the SSR to the 50 dB active gain (73 dB system gain) state per the procedure described in 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 7). 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. TABLE 1. Stability Rating Matrix Stability Rating Mounting Configuration Reference Figure Proximity of Base Station Radome Surface to Adjacent Vertical Surface 50 dB Active Gain 60 dB Active Gain Top Window Sill 3a 3b On Glass Surface More than ¼” Off Glass Surface Center of Window 3c On Glass Surface Wall Mounting 4a 4b On Wall Surface More than ½” Off Wall Surface Ceiling Mounting 5a 5b 5c Extension Pole Used None 1 foot 2 foot Rating Scale: Stable for 100% of All Installations Tested = 5 Stable for 80% of All Installations Tested = 4 Stable for 60% of All Installations Tested = 3 Stable for 40% 0f All Installations Tested = 2 Figure 1. Propagator PCS-1900 Repeater DC Power Jack Mounting Base (Rotated) Green Power LED Red Fault LED Down Link LED Up Link LED Nylon Thumb Screws (Attaches Mounting Base to Mounting Plate) 4X Mobile Side Radome Figure 2. Propagator Repeater Block Diagram Propagator PCS-1900 Repeater Block Diagram 4-1-01 IsolatorSML DL_Input_Isolator IsolatorSML DL_Output_Isolator BPF_Chebyshev Mobile_DPX_DL_Filter AntLoad Mobile_Side_Antenna Amplifier DL_Amp_with_ALC BPF_Chebyshev Mobile_DPX_UL_Filter BPF_Chebyshev Base_DPX_DL_Filter AntLoad Base_Side_Antenna Amplifier UL_Amp_with_ALC BPF_Chebyshev Base_DPX_UL_Filter IsolatorSML UL_Output_Isolator IsolatorSML UL_Input_Isolator Power / Interface Circuit 9 V Power Supply 110 VAC Figure 3. Preferred Window Mounting Figure 4. Wall Mounted Configuration Figure 5. Ceiling Mounted Repeaters Figure 6. Propagator Mounting Plate Figure 7. Propagator Mounting Base Attached to Mounting Plate Figure 8. 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 Model PRB-1900-xx Rx Freq (MHz) Rx NF Tx Freq (MHz) Maximum Tx Power at Antenna Port ACPR (IS-95) Power @110VAC Temp Range Total System Gain Rx/Tx Active Gain Size Weight -AD -BE -FC 1850-1870 1870-1890 1890-1910 5 dB Max 1930-1950 1950-1970 1970-1990 +11 dBm typical; +14 dBm Max -48 dB Min @ ±885 kHz 20 watts Max 30 to 95 o F 73 or 83 dB Typical 50 or 60 dB selectable 15” X 15” X 4” less Power Supply 8¾ lbs less Power Supply APPENDIX C: Gain Adjustment The standard factory active gain setting for the Propagator is 50dB. Some installation locations provide a very low multi-path feedback environment and can support a stable active gain of 60dB. Factory trained service personnel can easily set the gain of the Propagator to either gain setting using the following procedure: 1) Remove the white plastic radome on the mobile side of the Propagator. This is accomplished by using a dull pocket knife to first remove the plastic staking pins in the plastic rivets around the edge of the radome (see Figure C-1). After the staking pins are removed, the plastic expansion sleeves are easily extracted using the same dull pocket knife (see Figure C-2). 2) Remove the 4 nylon screws attaching the mobile side antenna circuit board to the nylon stand-offs on the electronics housing (see Figure C-3). 3) Carefully remove (unplug) the antenna circuit board using the large holes thru the circuit board adjacent to the RF connector on the bottom side of the circuit board. It may be necessary to rock the circuit board around after the RF connection is unplugged to get the circuit board past the 4 plastic LED lenses. 4) The gain setting jumpers are accessible thru two slot openings in the electronics housing cover (see Figure C-4). The jumpers should be covering both circuit pins for 50dB active gain (see Figure C-5). The jumpers should only be covering one pin for 60dB active gain (see Figure C-6). Set the jumpers for the desired gain in each channel; the downlink gain set jumper is nearest the mounting base of the Propagator (see Figure C-7). 5) Reverse steps 1-3 above to re-install the antenna circuit board and the radome. DO NOT DISTURB THE BRASS DIPLEXER TUNING SCREWS !!! Figure C-1. Plastic Rivet Staking Pin Removal Figure C-2. Plastic Rivet Expansion Sleeve Removal Figure C-3. Nylon Antenna Circuit Board Attachment Screws and LED Lenses #1 #3 LED Lenses #2 #4 Figure C-4. Gain Setting Jumper Slots Downlink Jumper Uplink Jumper Figure C-5. 50 dB Gain Jumper Orientation (Uplink Slot) Jumper Covers Both Circuit Board Pins in the 50dB Gain Position Figure C-6. 60 dB Gain Jumper Orientation (Uplink Slot) Jumper Covers Only One Circuit Board Pin in the 60dB Position
Source Exif Data:
File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.2 Linearized : No Page Count : 22 Creator : Create Date : 2001:05:24 17:17:06 Title : PCS 1900 INSTALLATION.PDF Author : DHanson Producer : Acrobat PDFWriter 3.02 for Windows NT Subject :EXIF Metadata provided by EXIF.tools