Miltel Communications SPEEDTRD433L1 Low Power Meter Reading Transceiver User Manual Transceiver

Miltel Communications Ltd Low Power Meter Reading Transceiver Transceiver

Transceiver User Manual

Speed TxRx Miltel Communications Ltd. 1Speed TxRxTranceiverFCC ID - SPEEDTRD433L1User ManualMiltel Communications Ltd. June 1998
Speed TxRx User ManualMiltel Communications Ltd. 2Table of ContentsChapter 1 Introduction...................................................................................................31.1 Purpose and Use............................................................................................31.2 System General Description ...........................................................................3Chapter 2 Theory of Operation .....................................................................................52.1 General Description ........................................................................................52.2 Block Diagram Description..............................................................................5Chapter 3 Technical Characteristics............................................................................93.1 Technical Specification ...................................................................................93.1.1 Electrical .........................................................................................................93.1.2 Physical.........................................................................................................103.2 Label Contents..............................................................................................11Chapter 4 Installation Instructions .............................................................................134.1 General.........................................................................................................134.2 Installation.....................................................................................................10
Speed TxRx User ManualMiltel Communications Ltd. 3Chapter 1Introduction1.1 Purpose and UseThe Speed TxRx Transceiver (FCC ID - SPEEDTRD433L1) is a low-power data linktransceiver that relays digital data from low power Transmitters (FCC ID -MLLTX433L1), which are connected to water meters, to a Regional Concentrator. Itis also used in the receive mode as a front-end to the Concentrator. The informationin this manual is provided only as instructions for installation and does not entitle userto make any modifications or adjustments.1.2 System General DescriptionThe Speed TxRx system is a computerized fully automatic radio device. It requiresno human intervention after initial installation. The device includes the followingparts: 1. Transmitter 2. Receiver 3. Controller 4. Antennas and cables 5. DC regulator 6. EnclosureThe Transceiver receives DC power and digital data from the Repeater orConcentrator and Transmit \ Receive RF through coaxial cables which are connectedto half wavelength Dipole antennas.Note: 1) The system, including transmitters, transceivers and concentrators, isinstalled and maintained only by qualified professional technicians. 2) The device is not adjustable by user and is supplied by manufacturerready for installation witout provisions for adjustmant.
Speed TxRx Miltel Communications Ltd. 5Chapter 2Theory of Operation2.1 General DescriptionIn receive mode, the Speed TxRx receives data from the Speed Tx Transmitters whichare deployed near the water meter/s or from other Speed TxRx units which are inTransmit mode. The received data is processed differently whether the unit isconnected to a Repeater control device or as a front-end to a Concentrator. Whenconnected to a Repeater, the received data is processed in the Repeater’s controller.Only messages, which need to be relayed, are transferred to the Transceiver’scontroller.The Controller initiates a transmission only if 30 sec. have elapsed from the previoustransmission. Upon validation, the Controller switches the Transceiver to Transmitmode and transmits the data. The controller also selects the antenna from which themessage will be transmitted/received.When connected as a Concentrator front-end, the Transceiver operates in receivemode. The received data is transferred to the concentrator for further processing of themeter data.
Speed TxRx User ManualMiltel Communications Ltd. 62.2 Block Diagram Description2.2.1 GeneralFigure 2-1 describes the block diagram of the Speed Tx Rx unit. RF is received or transmittedfrom either antennas upon the controller selection. Two antennas are used to improveperformance in urban environment where shadowing, due to tall buildings, generates severmultipath effect. This effect can reduce the received signal by more than 30dB, thus by switchingantennas periodically the transceiver improves reception.2.2.2 TransmitterA PLL IC ( MC13176 from Motorola Semiconductors) gets the reference, 13.56MHz, from acrystal oscillator and locks the VCO output, divided by 32, to the crystal frequency. Therefore,the output frequency equals Crystal_frequency x 32 = 433.92 MHz.The message digital data from the Controller is shaped and modulates the VCO frequency. TheVCO output is attenuated by a resistive Π Attenuator. A 6 pole low pass filter that rejects theharmonics, further filters the output. The output is routed through a T/R switch and a diversityswitch to the output/input UHF connectors.Coaxial cables connect the half-wavelength dipole antennas with the Transceiver. All theemissions parameters are in compliance with FCC part15C specifically the limitations set by15.231(e). When the Transceiver is in the receive mode the voltages to the Transmitter are off.
Speed TxRx User ManualMiltel Communications Ltd. 7Figure 2-2: Speed TxRx Block DiagramAntennaAntennaVCOPhase LockedLOOP(PLL)MC13176Crystal13.56MHzInternaladjustment range433.92MHz +/-35KHz433.92MHzVCOCrystal13.56MHzDiversityswitch T/RswitchSAW filter433.92MHz BPF& LNA 10.7MHZ 1st IFVCOCrystal10.245MHz423.22MHz LO455KHz 2nd IFFM DemodulatorCoaxial CablesHarmonic Filter& AttenuatorDipoleDipoleTransmitterTransceiver EnclosureReceiverControllerDCRegulatorTo Repeateror Concentrator
Speed TxRx Miltel Communications Ltd. 82.2.3 ReceiverThe input signal from either ports is routed with the T/R switch to the receiver section. The signalis filtered, amplified and further filtered by a high selectivity SAW filter. Local Oscillatorleakage is greatly reduced by the reverse isolation of the amplifier and mostly by the Narrow bandSAW filter.The Receiver is a double down converter super_het receiver. The 2nd IF output is applied to anFM discriminator that demodulates the signal and reproduces the digital data which is transferredto the Repeater. A shielded 5-wire cable connects the Transceiver to a Repeater or a Concentrator.2.2.4 ControllerThe controller receives and sends data to and from the Repeater or the Concentrator. When a datashould be transmitted, The Controller turn on the voltages to the Transmit section and modulatesthe transmitter VCO. The Controller is a single chip with integral RAM and ROM.2.2.5 RegulatorThe DC regulator filters The DC voltage from the Repeater or the Concentrator and distributesthe power accordingly.
Speed TxRx User ManualMiltel Communications Ltd. 9Chapter 3Technical Characteristics3.1 Technical Specification3.1.1 Electrical TransmitterMax. Effective RadiatedPower (ERP) includingDipole antennas1.4µW peak (Complies with FCC15.231(e))Output frequency 433.92 MHz. Crystal Controlled.Carrier wave modulation 2 levels FSK with a subcarierBandwidth 50KHz max. At –20dBc pointsTransmit Duration 0.8 Sec Max.Duration betweenTransmissions30 Seconds Min.ReceiverType Crystal Controlled, Super-HeterodyneFrequency Conversions Two, 1st IF: 10.7MHz, 2nd IF: 455KHzFM Demodulator Quadrature detector with a video filterand a Compartor.Sensitivity -117dBm at transceiver ports.Measured with 10 messages with noerrors,
Speed TxRx User ManualMiltel Communications Ltd. 10GeneralInterface toRepeater/ConcentratorShielded 5-wire cableAntennas Half wavelength Dipoles, 50ς betterthan 2:1 VSWRPower Supply 110V AC / 12V DC UL CertifiedConverter3.1.2 PhysicalOperating temperature -10÷+60°CWater Resistance Splash resistance (IP-64)Length 160 mm.Width 120 mm.Depth 75 mm.Weight (excludingAntennas)420 gr.Enclosure An inner shielded steel box in a plasticbox housing. UHF connectors for RFand a 5-wire shielded cable for Dataand DC.
Speed TxRx User ManualMiltel Communications Ltd. 113.2 Label ContentsFCC ID: MLLSPEEDTRD433L1Model: Speed TxRx_433_L1S/N: YY-nnnnnnMiltel Communications Ltd. Made in IsraelThis device complies with Part 15 of the FCC rules. Operation is subjected to thefollowing two conditions: (1) This device may not cause harmful interference, and(2) this device must accept any interference that may cause undesired operation.Figure 3-1: Label
Chapter 4Installation Instructions4.1 GeneralThe Speed TxRx Transceiver should be installed only by a professional technician.Once installed, the Antennas and Coax Cables should not be modified as this mayeffect performance and will violate the FCC requirements. The Speed TxRx unitshould be installed in a secure location so that it is not accessible.4.2 InstallationBefore installing the Speed TxRx Transceiver complete the antenna installation. Theantennas should be installed by a qualified installer according to the appropriateguidelines and regulations. Antennas should be installed vertically. Distance betweenantennas should be 40 cm. (min). After antenna installation coax cables should beconnected and secured. Once antennas are installed and coax cables are put in placethe Speed TxRx device can be installed as follows:1) Loosen the four screws fastening the unit's box and open the box cover.2) Install the box base at a secure location as close as possible to Antenna location.3) Connect the Speed TxRx Transceiver to the Repeater or to the Concentratorusing approved 5 wire shielded cable.4) Connect the Speed TxRx Transceiver to external Power Supply.5) Connect both coax cables to Speed TxRx Transceiver and secure them inplace.6) Close the unit's box cover.7) Perform functional radio test and verify correct reception of data atconcentrator.

Navigation menu