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Summary of Contents for Ritron Liberty RLR-460
- Page 1 TYPE OF EXHIBIT: USERS MANUAL FCC PART: 2.1033(c)(3) MANUFACTURER: RITRON, Inc. 505 West Carmel Drive Carmel, IN 46032 MODEL: RLR-460 TYPE OF UNIT: UHF FM Repeater FCC ID: AIERIT15-460 DATE: November 25, 2002...
- Page 2 Pub. RLR-MRM PATRIOT TWO-WAY RADIO BY RITRON PROGRAMMABLE FM REPEATER RLR-460 2/5 Watt UHF MAINTENANCE/REPAIR/OPERATING MANUAL FOR USE BY AUTHORIZED SERVICE/MAINTENANCE PERSONNEL ONLY...
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Page 3: Table Of Contents
TABLE OF CONTENTS SPECIFICATIONS 1.1. GENERAL 1.2. RECEIVER 1.3. TRANSMITTER INTRODUCTION 2.1. GENERAL 2.2. INSPECTION 2.3. MODEL IDENTIFICATION 2.4. FCC REGULATIONS 2.5. RF SAFETY ISSUES INSTALLATION OPERATION 4.1. GENERAL 4.2. DUTY CYCLE/TEMPERATURE LIMITS 4.3. INDICATORS 4.4. CONNECTORS PROGRAMMING 5.1. PROGRAMMING SETUP 5.2. - Page 4 8.2. CONTROLS AND ADJUSTMENTS SUMMARY 8.3. SCHEMATICS 8.4. PCB COMPONENT LOCATOR...
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Page 5: Specifications
SPECIFICATIONS GENERAL Frequency Range 450-470 MHz FCC ID RX/TX Separation: 5 MHz Operational Bandwidth Duplexer 50 kHz Receiver and Transmitter 5 MHz Synthesizer Step Size 12.5 kHz Channels Power Requirements 2 watt maximum output 12 VDC nominal @ 1A minimum 5 watt maximum output 12 VDC regulated @ 2 A minimum Tone/Code signaling... -
Page 6: Introduction
This product has been evaluated for compliance with the maximum permissible exposure limits for RF energy at the maximum power rating of the unit and with the whip antenna available from RITRON. To ensure compliance with General Population/Uncontrolled maximum exposure limits, all persons must be at least 20 cm (7.9 inches) from the antenna while the unit is transmitting. - Page 7 • DO NOT OPERATE THIS EQUIPMENT unless all RF connectors are secure and any open connectors are properly terminated. • GROUND ALL RADIO EQUIPMENT. • ALLOW ONLY QUALIFIED SERVICE PERSONNEL to service this product. • DO NOT ALLOW THIS EQUIPMENT to be set to power levels above its design limit or the licensed maximum.
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Page 8: Operation
OPERATION GENERAL Test the Repeater for proper operation as the unit is received before attempting to reprogram and/or retune it. There is no On/Off switch on the unit; it is powered up when a power supply is connected. Standard factory programming is a receive frequency of 469.500 MHz and a transmit frequency of 464.500 MHz. Retune the internal duplexer if either the receive or transmit frequency are to be changed by more than 50 kHz. -
Page 9: Indicators
Near the middle of the front panel is the Interface Connector. This connector is a female telephone RJ-12 modular connector which allows local microphone, speaker, Push-to-Talk and programming connections. The RITRON Speaker/Microphone sold for use with the Repeater plugs into this connector. The pinout and description of the pins of this connector are as follows: Pin No. - Page 10 R330 and it is capable of driving 8-ohm loads. PROG Bi-directional pin for connection to the RITRON programmer. Note: There is no internal muting on the two audio input pins, AUDIO IN and PTT/MIC. Insure that no active signal is present on these inputs unless it is desired for that signal to be transmitted.
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Page 11: Programming
To use the programming software, connect the Repeater to the computer serial port with the RITRON adapter cable. Insert the software diskette into the floppy disk drive and load the software program. The software includes on-screen instructions and Help files. You can also program added Repeaters identically by saving data to the computer hard drive. -
Page 12: Programming The Repeater
PROGRAMMING THE REPEATER Remove power from the Repeater. Insert the programming cable into the RJ-12 jack on the front of the Repeater. Start the programming software and follow the on-screen instructions. Insert “R” on the main software screen to return to normal operating mode. -
Page 13: Quiet-Call Codes And Frequencies
QUIET-CALL CODES AND FREQUENCIES T one Freq. Tone Freq. Tone Freq. Code Code (Hz) Code Code (Hz) Code Code (Hz) 67.0 123.0 225.7 71.9 127.3 233.6 74.4 131.8 241.8 77.0 136.5 250.3 79.7 141.3 69.4 82.5 146.2 159.8 85.4 151.4 165.5 88.5 156.7... -
Page 14: Alignment
ALIGNMENT DUPLEXER The duplexer allows the Repeater to simultaneously transmit and receive. To accomplish this, in the receive input path, the transmitter signal must be notched or suppressed by 70 dB or more. In addition, on the transmit path, transmitter noise on the receive frequency must be also suppressed by about 70 dB. The duplexer contains four cavities, two for each path to achieve the necessary notch depth. -
Page 15: Receiver 1
RECEIVER Apply power to the Repeater. The green front panel LED should be illuminated, but may be blinking. Connect the MON input (modular jack pin 4) to ground (modular jack pin 1). This will override the squelch operation and also inhibit the transmitter. 6.3.1 Local Oscillator Trim Connect a test probe from a frequency counter or frequency measuring device to test point TP103. -
Page 16: Transmitter
to zero. Then, slowly adjust R312 clockwise to the point where the TP104 voltage again goes to 5 volts. 6.3.5 Audio Output Level Increase the RF signal generator output level to 7 uV (-90 dBm). The SINAD reading should be close to 20 dB or so. - Page 17 Set R347 (TONE DEVIATION) to the full counterclockwise position. To RF output should be routed to an FM demodulator and the demodulated output made viable on an oscilloscope. The filtering on the demodulator should be 15 kHz or higher on the lowpass filter and below 50 Hz on the highpass filter.
- Page 18 R378 should be installed. This is the normal configuration of the Repeater as set at the factory and is the configuration for use with the RITRON RPS-1A power supply. If a regulated power supply is used, the internal regulator may be bypassed to allow higher current operation and thus greater output power to 5 watts.
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Page 20: Theory Of Operation
THEORY OF OPERATION DUPLEXER The duplexer allows for simultaneous transmission and reception of RF signals. There is a receive path and a transmit path which connect to the RF input and output of the main PCB and a common point at the antenna connector. -
Page 21: Transmitter
U101 also provides for squelch operation. The presence of a carrier is sensed by noting that ultrasonic noise on the demodulated output decreases when a carrier is present. An amplifier between pins 7 and 8 of U101 and associated external parts form an audio bandpass filter at 3.5 kHz. The output of this filter is internally rectified and exits at pin 14. -
Page 22: Audio
AUDIO 7.4.1 Receiver Discriminator audio from U101 passes to U301-A where it is buffered and then sent to the tone signaling filter and the voice highpass filter. U302, a 5-pole switched capacitor low-pass filter is used to remove voice and other components from the discriminator audio and leave only signaling tones. The output passes to comparator U300-A where it is converted to square waves for the microcontroller. -
Page 23: Maintenance Aids
MAINTENANCE AIDS MICROCONTROLLER PIN-OUTS The pin-outs and description for U308, the microprocessor follow. Note that a logic low (0) is a voltage below 0.5 volts while a logic high (1) is a voltage above 3.5 volts. RESET Active low pin used to place the microcontroller in the reset state. This pin is driven by U307, a commercial microprocessor supervisory IC which is designed to go low after power supply voltage glitches and power-up. - Page 24 This input is the square wave from the receive tone filter and comparator, U300-A. This waveform would normally be a square wave version of a received QC or DQC tone/signal. SPKR EN This output enables the audio gate which drives the audio PA for speaker audio. It is active low when speaker audio is to be present.
- Page 25 This output enables the transmitter synthesizer IC, U103 to receive data from the microprocessor. This pin will change states when the transmitter synthesizer is to be loaded. This would occur just before the Repeater is to transmit. RX SYN EN This output enables the receiver synthesizer IC, U102 to receive data from the microprocessor.
- Page 26 CONTROLS AND ADJUSTMENTS SUMMARY Below is a summary of the controls and adjustments on the Repeater. Most, if not all, are covered in the alignment section, but are included here for reference. L100-L104 These are the adjustable front-end bandpass filter inductors. Since the front-end has a bandwidth of about 7-8 MHz, these should be re-adjusted when the receive frequency is moved by 1 MHz or more.
- Page 27 This potentiometer sets the balance between the transmit audio signal sent to the transmit reference oscillator and the signal sent to the VCO. This is required to achieve a flat transmit audio frequency response. This adjustment tends to need re-adjustment if the transmit frequency is changed by 5 MHz or more.
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