DMR DIGITAL MOBILE RADIO ASSOCIATION DMR Repeater user manual Version 1v3 Radio Activity S.r.l. Sede: Via Ponte Nuovo, 8 - 20128 Milano – email: radio.activity@fastwebnet.it - www.radioactivity-tlc.com Tel. 02.36514205 - FAX/Voicebox 1782242408 - Registrazione CCIAA Milano N° 1728248 - P.I./C.F.
DMR repeater 18/02/2011 Versione 1.3 Index 1 RADIO ACTIVITY DMR REPEATER AND EXPANDIBILITY TO SIMULCAST NETWORK......................4 2 PARAMETERS CONFIGURATION AND REMOTE CONTROL ..........................................................5 3 HARDWARE COMPOSITION OF A BASE STATION .......................................................................6 4 3.1 PSU: POWER SUPPLY UNIT MODULE.............................................................................................. 6 3.
DMR repeater 18/02/2011 5.2.3 5.2.4 5.2.5 Versione 1.3 RX .................................................................................................................................................... 28 TX..................................................................................................................................................... 28 I/O .............................................................................................................................................
DMR repeater 18/02/2011 1 Versione 1.3 RADIO ACTIVITY DMR REPEATER AND EXPANDIBILITY TO SIMULCAST NETWORK Radio Activity DMR repeater is designed to be modular from both HW and SW point of view, to maximize its flexibility and minimize costs, physical dimensions, consumptions. Basic model already has all the characteristics to work as a double standard repeater with all the features of analogical and digital service.
DMR repeater 18/02/2011 Versione 1.3 ∞ Multi-receiver block for star-shaped network architectures with RF links; ∞ Antenna active splitter board. If a network architecture is needed, Radio Activity base stations can be connected through both a RF or ethernet link. 2 PARAMETERS CONFIGURATION AND REMOTE CONTROL Working parameter of the station are completely programmable through a SW package and a PC connection.
DMR repeater 18/02/2011 Versione 1.3 For further details about remote control software, refer to proper documentation (SW user manuals). 3 3.1 HARDWARE COMPOSITION OF A BASE STATION PSU: POWER SUPPLY UNIT MODULE Space for optional floating ground power supply External I/O polarity DC/DC 6.5Vcc Equipment is power supplied by nominal 13,8Vdc from battery with negative shorted to ground and with a maximum current absorption of 5 A.
DMR repeater 18/02/2011 3.2 Versione 1.3 DSP: DIGITAL SIGNAL PROCESSOR The core of system’s “physical layer” is this unit which via software performs every function of signal processing inside radio station. What other equipments implement by adding boards (like synchronizers, phase and amplitude equalizers, signal decoders, modem, etc.), here are implemented by routines which can be freely matched, down-loaded and with superior performance.
DMR repeater 18/02/2011 ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ 3.3 Versione 1.3 Frequency self-tuning device Deviation self-calibration device Analogical and digital demodulation RF circuits testing Phase modulator calibration RF output power control Low frequency lines management DMR protocols management Digital signals processing Management, conditioning and routing of traffic and remote control signals from and towards external world RECEIVER Receiver can be supplied as single or double for space diversity reception.
DMR repeater 18/02/2011 Versione 1.3 The switching between normal and test input is implemented through PIN diodes. Receiver modules is managed by a microcontroller unit whose program is hosted inside internal e2prom flash memory to lower parasitic emissions. This FW can be loaded through serial connection. The microcontroller, in addition to managing internal function of the unit, transfers measured parameters to the control unit through 115.2 Kb/s serial line.
DMR repeater 18/02/2011 Versione 1.3 The amplifier is realized by three cascaded stages and RF output power regulation (between 1 and 25W) is implemented by controlling the gates voltages of MOSFET amplifier stages. Power amplifier works in C class and ensures a very high efficiency, lowering the needed power from supply system and lowering the thermal dissipation inside the cabinet. Direct and reflected output power are measured by a directional coupler.
DMR repeater 18/02/2011 Versione 1.3 SIM HOLDER BF line interface GSM/GPRS - GPS I/O contacts 4 4.1 TECHNICAL DATA REGULATIONS COMPLIANCE Equipments are compliant with existing regulations, in particular: 1. EN 300 086-2: Technical characteristics and test conditions for radio equipment for analogue speech. 2. EN 300 113-2: Technical characteristics and test conditions for non speech radio equipment for the transmission of data. 3.
DMR repeater 18/02/2011 Base Bandwidth Calibration and tests Remote control 4.3 Versione 1.3 Audio 300-3400 Hz ±1dB Modulation 0-5 KHz Automatic at start-up and/or by remote control Via ethernet / serial RS232 / GPRS IP INTERFACING 4.3.
DMR repeater 18/02/2011 Jitter (deviation of averaged packet time delay) Maximum delay Packet loss Versione 1.3 The Base Station is able to compensate Jitter delay up to 200 ms. The total delay averaged + jitter must not exceeds 400ms (each way) The Base Station is able to compensate round trip delay less then 900ms (jitters included) < 0.
DMR repeater 18/02/2011 Coder algorithm DMR compatibility 4.4 Versione 1.3 AMBE II+TM (Advanced Multi-Band Excitation) Motorola Mototrbo series RADIO FREQUENCY Radio Transceiver model RA080, RA160, RA450, RA900, typical values. 4.4.1 TRANSMITTER Module output power RF final transistor protection to high temperature Available modulation Modulation bandwidth 1/5/10/15/20/25 W 85°C +/- 5°C progressively reducing the RF power FM, PM, GFSK, 4FSK 0 ..
DMR repeater 18/02/2011 Frequency stability Versione 1.3 0.5 p.p.m. -20dBm to avoid intermodulation Max reverse input signal +20dBm no damage 4.4.2 RECEIVER -113 dBm @20 dBp SINAD Maximum sensitivity -118dBm @5% BER without diversity -121dBm @5% BER with diversity Operating maximum input -10 dBm Maximum input without permanent damages +10 dBm Reception mode Received signal band Synthesis step Vectorial I e Q 0..5000 Hz 6,25 KHz 8 dB @25 KHz Co-channel protection 12 dB @12.
DMR repeater 18/02/2011 Distortion Versione 1.3 <2 % -53 dBp @25 KHz Noise -47 dBp @12.5 KHz -60 dBp (with voice search option) Frequency stability 0.5 p.p.m. Documento Riservato - non divulgabile senza autorizzazione Pag.
DMR repeater 18/02/2011 Versione 1.3 4.4.3 FREQUENCY BANDS Model Frequency band RA-900 UHF – HH => 865-925 MHz RA-450 UHF – H => 410-440 MHz RA-450 UHF – L => 430-470 MHz RA-160 VHF – H => 145-174 MHz RA-080 VHF – L => 68-88 MHz 4.4.4 COMMUTATION BAND (WITHOUT DUPLEXER) Band TX RX UHF – H 30 MHz 14 MHz UHF – L 30 MHz 12 MHz VHF – H 28 MHz 28 MHz VHF – L 20 MHz 20 MHz 4.4.5 BRANCHING REQUIREMENTS 4.4.5.
DMR repeater 18/02/2011 Band +/-40MHz Versione 1.3 +/-9MHz +/-4.5MHz +/-3MHz +/-1.5MHz +/-0.8MHz UHF – HH 75dB UHF – H/L 75dB 75dB VHF – H 75dB 75dB 75dB 78dB 81dB 85dB VHF – L 75dB 75dB 75dB 75dB 78dB 81dB 4.4.5.2 Suggested RX max input limits on unwanted signals TX RX main Band +/-1MHz +/-500KHz +/-100KHz +/-50KHz +/-25KHz +/-12.
DMR repeater 18/02/2011 Versione 1.3 4.5.1 ENVIRONMENTAL PARAMETERS Operating Temperature -25 ÷ +55 °C Storage Temperature -40 ÷ +70 °C Relative Humidity Max 80% not condensed 4.5.2 POWER SUPPLY 11 - 15 Vcc (neg. ground) 19 – 36 Vcc (floating ground) 38 – 60 Vcc (floating ground) Nominal Voltage Max ripple 30 mVpp Polarity reversal protection Short-circuit protection -70 V Electronic protection with automatic restore and double fuse on input line Power consumption TX: 55 W @20W RF RX: 8 W 4.
DMR repeater 18/02/2011 Versione 1.3 Side tone reflection < - 20 dB Output nominal level -20 .. 0 dBm Input nominal level -20 .. 0 dBm Hang line current 10..50 mA Level adjust software by 0.1dB step Ring detect 60..120 Vpp @25Hz Ring generator (option) 90Vpp @25Hz Release tone detection 3 pulses of 425Hz @50% duty 250ms/250ms 5 5.
DMR repeater 18/02/2011 RS232 port Versione 1.
DMR repeater 18/02/2011 Versione 1.3 3. A female BNC-type connector (below the N-type one) is present if the base station is equipped with the diversity receiver. This connector is directly connected to the input of the diversity receiver, without any cavity filter/isolation inside the equipment. Care should be taken in designing external branching and radiant system; 4. A female SMA-type connector for embedded GPS receiver.
DMR repeater 18/02/2011 Versione 1.3 ∞ “MTCH”: two 8 poles RJ45 connectors (connected in parallel) give access to internal digital audio multichannel (synchronous, TDMA, 4Mbit/s speed, serial interface with custom protocol). These connectors are used to implement any particular system and network architectures which require the base station to be connected to other devices equipped with the same MTCH interface.
DMR repeater 18/02/2011 Versione 1.3 ∞ “Matrix” connector: a 20 poles connector (2x10, pitch 2.54mm) and a coaxial MCX-type connector with a set of signals which can be used to implement any particular system and network architectures which require the base station to be connected to other devices equipped with the same MTCH interface.
DMR repeater 18/02/2011 Versione 1.3 For example, the following picture shows how two repeaters should be connected to implement a simulcast network with ethernet links.
DMR repeater 18/02/2011 Versione 1.
DMR repeater 18/02/2011 5. 2 Versione 1.3 EQUI PMEN T ST A R T UP, R UN N I NG A N D A LA R MS: I N DI C A T OR LA MPS The base stations of RA-xxx series are designed to reduce as much as possible the maintenance work. To this aim, specific solutions have been implemented to prevent aging drifts. Each time the base station is switched on, a self-calibration process is performed in order to finely tune the modulation and the demodulation parameters.
DMR repeater 18/02/2011 Versione 1.
DMR repeater 18/02/2011 Versione 1.
DMR repeater 18/02/2011 Versione 1.3 The equipment is designed to be powered by a safe supply source which grants a double insulation of output voltage from dangerous voltages. The electric plant must contain a switch to cut off power supply lines, according to national law and directives. It is recommended to use power supply sources with low impedance output stage to make the hot swap controller of PSU properly work.
DMR repeater 18/02/2011 Versione 1.3 of tolerance), it is possible to calculate the minimum distance of people from the antenna by using the following equation for RF power decay in free space (far field): S = ( P x G / 4 x π r2 ) where: S = maximum power density P = maximum transmitted RF power G = antenna gain R = distance from antenna. This gives: r=√(PxG/Sx4xπ) For VHF (150-174MHz) equipments the minimum safety distance is r = 2,75 m.
DMR repeater 18/02/2011 Versione 1.3 1 OFF 2 ON 2 OFF Zin (4W) = High 2W 4W 5.3.8 SELF-CALIBRATION PROCESS During self-calibration process internal parameters of modulator and demodulators are tuned by generating a signal through the synthesizer of the transmitter, by automatically connecting its output to the input of the receiver and by analyzing the received signal.