61-38-05 UserMan page 1 of 38 Part No. 7-9408-1.2 Installation and Operation Manual for the Two-Way Signal Booster System Model Number 61-38-05 Copyright © 2005 TX RX Systems Inc. First Printing: June 2005 Version Number Version Date 1 06/14/05 1.1 07/12/05 1.
61-38-05 UserMan page 2 of 38 Warranty Symbols This warranty applies for one year from shipping date. Commonly Used TX RX Systems Inc. warrants its products to be free from defect in material and workmanship at the time of shipment. Our obligation under warranty is limited to replacement or repair, at our option, of any such products that shall have been defective at the time of manufacture. TX RX Systems Inc.
61-38-05 UserMan page 3 of 38 For Class A Unintentional Radiators This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
61-38-05 UserMan page 4 of 38 Antenna System Installation The antenna or signal distribution system consists of two branches. An uplink branch typically uses an outdoor mounted, unidirectional gain antenna such as a yagi and a downlink signal radiating system consisting of a network of zero-gain whip antennas or lengths of radiating cable usually mounted inside of the structure. Even though the antenna system may not be supplied or installed by TX RX Systems.
61-38-05 UserMan page 5 of 38 Table of Contents Section 1 Introduction ......................................................................................................... 1 Note About Output Power Rating ........................................................................ 3 Installation............................................................................................................ 3 Cautionary Notes ......................................................................................
1-38-05 UserMan page 6 of 38 Maintenance and Repair ................................................................................... 26 Recommended Replacement Parts ................................................................. 26 Conversion Chart .............................................................................................. 26 Figures and Tables Figure 1: Front view of typical 61-38-05 system ...................................................
61-38-05 UserMan page 7 of 38 INTRODUCTION This publication, Instruction Manual 7-9408-1, contains information to support the installation, operation, and maintenance of the model 61-38-05 signal booster system. Also included in this manual are the procedures necessary for field adjustments. It is assumed that procedures in this manual will be carried out by a skilled electronics technician who is familiar with the communications system.
61-38-05 UserMan page 8 of 38 RF In/Output Connector Power Supply Assembly 3-11503 RF In/Output Connector Regulator 3-5969 Regulator 3-5969 High Power Amplifier Assembly 3-11792 High Power Amplifier Assembly 3-11792 1 stg/3 stg Amplifier Assembly 3-11423 1 stg/3 stg Amplifier Assembly 3-11423 OLC Assembly 3-6280 OLC Assembly 3-6280 Signal Sampler 3-6999 Signal Sampler 3-6999 Signal Sampler 3-3569 Signal Sampler 3-3569 Filtering Filtering Backup Battery connects here Figure 1: Front view o
61-38-05 UserMan page 9 of 38 performance of the system is actually decreased on all other channels within the branch as long as gain reduction is taking place. This implies that OLC has been designed to handle short term or transient overdrive episodes only. Note About Output Power Rating A single maximum output power rating does not apply to broadband signal boosters because the linear amplifiers (Class A) used in them may have to process multiple simultaneous signals.
61-38-05 UserMan page 10 of 38 nected at this time. The 3-pin MS style connector for the backup power system is labeled and is located on the bottom of the enclosure. A photograph of the bottom of the cabinet is shown in Figure 2. Connection of RF to the unit is made via “N” female connectors located on top of the cabinet. These connectors are individually labeled “High Frequencies IN Low frequencies OUT” and “Low Frequencies IN High Frequencies OUT”.
61-38-05 UserMan page 11 of 38 Test Equipment The following equipment is required in order to perform the pre-installation measurements. 1) Signal generator for the frequencies of interest capable of a 0 dBm output level. Modulation is not necessary. 2) Spectrum analyzer that covers the frequencies of interest and is capable of observing signal levels down to -100 dBm. 3) Double shielded coaxial test cables made from RG142 or RG55 coaxial cable.
61-38-05 UserMan page 12 of 38 4) Referring to figure 4, connect the generator test lead to one side of the signal distribution system (external antenna) and the spectrum analyzer lead to the other (internal distribution system) and observe the signal level. The difference between this observed level and 0 dBm is the isolation between the sections. If the signal is too weak to observe, the spectrum analyzer's bandwidth may have to be narrowed and its input attenuation reduced. Record the isolation value.
61-38-05 UserMan page 13 of 38 S IG N A L D IS T R IB U T IO N S p e c tru m S Y S T E M A n a ly z e r R a d io 2 R a d io 1 Figure 5: Typical test equipment setup for measuring input signal levels. 3) The analyzer input attenuator should be set to observe input signal levels from approximately 80 dBm to 0 dBm. 4) Connect the analyzer to the section of the signal distribution system that is going to serve as the input for the branch you want to observe (see Figure 5).
61-38-05 UserMan page 14 of 38 Reduction of Incoming Signal Strength Reducing the strength of offending signals may require some or all of the following steps: a) The addition of extra filtering. Consult TX RX System's sales engineers for help in this respect. b) Modification of the signal distribution layout by changing the type or location of pickup antennas. This has to be approached in an empirical way, that is, change-and-try until you get the desired results.
61-38-05 UserMan page 15 of 38 -50 dB coupling loss of the signal sampler and any additional loss produced by attenuator pads on the analyzer input. A pad on the analyzer input can help to minimize measurement errors due to VSWR mismatch that occurs with some analyzers. A pair of fixed attenuator pads (3 and 6 dB) are supplied for the purpose of gain reduction. They are mounted in clips to the top of the filter assemblies in the center of the unit.
61-38-05 UserMan page 16 of 38 and downlink branches are physically identical, both being constructed from the same set of subassemblies, the signal flow discussion that follows is applicable equally well to both branches. The only difference between the two branches is the tuning of their passbands. Signals enter the system through the RF connectors at the top of the cabinet. This is where the customers antenna system is interfaced to the booster.
61-38-05 UserMan page 17 of 38 Single channel bandpass filters are generally 4pole crystal filters using piezo-electric resonators. A secondary but very beneficial effect of filtering is instantaneous input and output frequency spectrum limiting which helps to prevent amplification of unwanted channels.
61-38-05 UserMan page 18 of 38 RF from Sampler RF to DC Converter Detector Voltage Test Point +15 VDC OLC Voltage Test Point CONTROL VOLTAGE Pin Diode Attenuator OUTPUT OLC Voltage Adjust INPUT 10V Regulator Adjust Figure 8: OLC assembly 3-6280. larger. This change causes the output of IC2 to also become increasingly negative. This output voltage is connected via diode D1 to bias the PIN diode attenuator.
61-38-05 UserMan page 19 of 38 The bias regulator circuit uses an Op-Amp comparator IC1 to supply a variable bias current which varies as required to keep the RF transistors collector current constant. Current to the collector of the RF transistor flows through resistor R1. The voltage at the collector side of this resistor is applied to the non-inverting input of IC1. Voltage divider R2 / R4 sets the desired reference voltage on the inverting terminal of IC1.
61-38-05 UserMan page 20 of 38 equipment such as a spectrum analyzer and will allow the observation of the amplifier output at a considerably reduced output level. This decoupling figure needs to be added to a measured signal value in order to arrive at the actual signal level. OLC assemblies appear in schematic representation on the specification drawings. nected to pin 4. Relay K1 is de-energized when the AC power supply is off.
61-38-05 UserMan page 21 of 38 SPECTRUM ANALYZER SIGNAL DISTRIBUTION SYSTEM BOOSTED RF SIGNAL 10 dB Pad OLC Assembly DC Control Detector Filter Filter Amp Electronic Attenuator Sampler Sampler DC Figure 10: Test equipment interconnection for surveying performance. assumed that the procedures will be carried out by a qualified electronics technician observing all standard safety practices.
61-38-05 UserMan page 22 of 38 4) The amplifier assemblies may have to be retuned. 5) The length sensitive interconnect cables may need to be changed. If you are not sure about tuning the signal booster system to new frequencies then contact your TX RX Systems, Inc. representative. Our knowledgeable engineering and sales staff are happy to discuss what it will take to tune your system to the new frequencies.
61-38-05 UserMan page 23 of 38 either the transmission or reflection response may be unavoidable. Bandpass Filters The bandpass filters pass one narrow band of frequencies (the passband) and attenuate all others with increasing attenuation above and below the pass frequencies. The insertion loss setting determines the filters selectivity and maximum power handling capability. Insertion loss is set at the factory. Cavity tuning follows a two step process.
61-38-05 UserMan page 24 of 38 "MODE" main menu item and choosing the "STORE" command. This will store the flat-line value in the analyzer's internal memory. 6. Next select the "DISPLAY" main menu item and choose the "REFERENCE" command. This will cause the stored value to be displayed on the screen as the 0 dB reference value. 7.
61-38-05 UserMan page 25 of 38 REQUIRED EQUIPMENT Due to the sensitivity of the adjustments, it is strongly recommended that the proper equipment be used when tuning the individual filters, otherwise the filter should be sent to the factory or an authorized representative for retuning. The following equipment or it's equivalent is recommended in order to properly perform the tuning adjustments. 2) Eagle Model RLB150BN3 Return Loss Bridge (35 dB directivity).
61-38-05 UserMan page 26 of 38 Sliding Main Tuning Rod (Notch) Tracking Generator +40 +30 Main Tuning Lock Nut +20 +10 0 -10 -20 -30 -40 Analyzer Input Generate Output Passband Tuning Capacitor Input/Output Connectors 2" Square VHF Pseudo-Bandpass Filter Figure 17: The Notch filter. Tune Figure 16: Tuning the Pseudo-bandpass filter for maximum attenuation. b) From the Mode Menu, "STORE" the above trace. c) Switch to the Display Menu and select "REF".
61-38-05 UserMan page 27 of 38 4) 50 Ohm load with at least -35 dB return loss (1.10:1 VSWR). 5) Insulated metal blade tuning tool for adjusting ceramic and/or piston variable capacitors. Similar equipment from other manufacturers should yield acceptable results. 1) Set the tracking generator to a center frequency of the filter to be tuned. Set the tracking generator for 0 dBm output and a 10 dB/div scale. Connect the equipment as shown in Figure 18 but leave the load port of the bridge unconnected.
61-38-05 UserMan page 28 of 38 in temperature. The collector current remains constant when these amplifiers are running properly. The actual value of bias current will be different for different types of amplifiers but can also vary slightly if the power supply voltage varies. All versions of the current production bias regulators are designed for fixed values of RF transistor collector current.
61-38-05 UserMan page 29 of 38 forming a multi-section subassembly. This procedure requires the following equipment: 1) IFR A-7550 Spectrum Analyzer / Tracking Generator combination. ADJUSTMENT PROCEDURE 1) Set the tracking generator output level to -20 dBm, the desired center frequency and sweep width of 20 MHz. 2) Eagle RLB150N3 Return Loss Bridge or equivalent (35 dB directivity). 2) Connect the test lead together through a female barrel connector to obtain a zero dB reference level.
61-38-05 UserMan page 30 of 38 5) Engage the Input Tuning Capacitors one at a time and rotate them for maximum gain. c) Switch to the Display Menu and select "REF". The trace should appear at the 0 dB level. NOTE: If the gain peaks at a level about 60% of maximum, one of the variable capacitors should be rotated 180° and steps 4 and 5 repeated. 6)Connect the return loss bridge to the tracking generator as shown in Figure 22 but do not connect it to the amplifier. Leave the test port on the bridge open.
61-38-05 UserMan page 31 of 38 12) Due to interaction, tuning the output circuitry affects the input tuning and vise-versa. Repeat steps 8 through 11 until acceptable input and output return loss occurs without further tuning. 13) Connect the equipment as shown in Figure 24 but connect the test leads together through a female barrel connector and repeat the zero reference procedure of step 2. 14) Using the figure 24 connection, verify that the reverse isolation is at least -20 to -22 dB.
61-38-05 UserMan page 32 of 38 generally cause noticeable gain reductions to other channels on the system and may also exceed the maximum input level. A) Open the signal booster cabinet and inspect for any loose or broken connections or cables, and repair as necessary. Connect the positive lead of a multimeter set to measure DC voltage on a 0-20 volt scale, to the OLC voltage test point on the OLC assembly. Figure 8 shows the location of the test point on the 36280 OLC assembly.
TXRX Systems Inc. +28 Maximum Output Power (1 carrier)Watts Manual 7-9408-1.2 6.5 System Noise Figure (dB) without pads 07/25/05 50 50 24 x 20 x 10 (610 x 508 x 254) 70 (31) Nominal Size (in./ mm) Net Weight (Lbs / Kg) 70 (31) 24 x 20 x 10 (610 x 508 x 254) G1: Painted Steel to NEMA 4 G2: Stainless Steel to NEMA 4X G1: Painted Steel to NEMA 4 G2: Stainless Steel to NEMA 4X Housing 2 Amps DC, <0.5 Amps AC 24 - 29 VDC 100-120 / 200-240 @ 50/60 Hz BNC female Type 'N' female 2.
Specification TXRX Systems Inc. +26 Manual 7-9408-1.2 6.5 Nominal Impedance (ohms) 07/25/05 50 50 75 (33) Net Weight (Lbs / Kg) 75 (33) 30 x 20 x 8 (762 x 508 x 203) G2: Stainless Steel to NEMA 4X 30 x 20 x 8 (762 x 508 x 203) G2: Stainless Steel to NEMA 4X Nominal Size (in./ mm) 2 Amps DC, <0.5 Amps AC G1: Painted Steel to NEMA 4 2 Amps DC, <0.
61-38-05 UserMan page 35 of 38 Power Conversion Chart dBm to dBw: Watts: Microvolts dBm dBw Watts Volts (50Ω) dBm dBw Watts Volts (50Ω) 80 50 100000 2236.07 40 10 10 22.36 79 49 79432.82 1992.9 39 9 7.94 19.93 78 48 63095.74 1776.17 38 8 6.31 17.76 77 47 50118.72 1583.01 37 7 5.01 15.83 76 46 39810.72 1410.86 36 6 3.98 14.11 75 45 31622.78 1257.43 35 5 3.16 12.57 74 44 25118.86 1120.69 34 4 2.51 11.21 73 43 19952.62 998.81 33 3 2 9.
61-38-05 UserMan page 36 of 38 Power Conversion Chart dBm to dBw: Watts: Microvolts dBm dBw Watts uVolts (50Ω) dBm dBw Watts uVolts (50Ω) 0 -30 1.0000E-03 223606.8 -40 -70 1.0000E-07 2236.07 -1 -31 7.9433E-04 199289.77 -41 -71 7.9433E-08 1992.9 -2 -32 6.3096E-04 177617.19 -42 -72 6.3096E-08 1776.17 -3 -33 5.0119E-04 158301.49 -43 -73 5.0119E-08 1583.02 -4 -34 3.9811E-04 141086.35 -44 -74 3.9811E-08 1410.86 -5 -35 3.1623E-04 125743.34 -45 -75 3.
61-38-05 UserMan page 37 of 38 Power Conversion Chart dBm to dBw: Watts: Microvolts dBm dBw Watts uVolts (50Ω) dBm dBw Watts uVolts (50Ω) -80 -110 1.0000E-11 22.36 -120 -150 1.0000E-15 0.22 -81 -111 7.9433E-12 19.93 -121 -151 7.9433E-16 0.2 -82 -112 6.3096E-12 17.76 -122 -152 6.3096E-16 0.18 -83 -113 5.0119E-12 15.83 -123 -153 5.0119E-16 0.16 -84 -114 3.9811E-12 14.11 -124 -154 3.9811E-16 0.14 -85 -115 3.1623E-12 12.57 -125 -155 3.1623E-16 0.
61-38-05 UserMan page 38 of 38 NOTES TXRX Systems Inc. Manual 7-9408-1.
