Speed TxRx Speed TxRx Tranceiver FCC ID - SPEEDTRD433L1 User Manual Miltel Communications Ltd. Miltel Communications Ltd.
Speed TxRx User Manual Table of Contents Chapter 1 Introduction...................................................................................................3 1.1 Purpose and Use ............................................................................................3 1.2 System General Description ...........................................................................3 Chapter 2 Theory of Operation .....................................................................................5 2.
Speed TxRx User Manual Chapter 1 Introduction 1.1 Purpose and Use The Speed TxRx Transceiver (FCC ID - SPEEDTRD433L1) is a low-power data link transceiver that relays digital data from low power Transmitters (FCC ID MLLTX433L1), which are connected to water meters, to a Regional Concentrator. It is also used in the receive mode as a front-end to the Concentrator.
Speed TxRx Chapter 2 Theory of Operation 2.1 General Description In receive mode, the Speed TxRx receives data from the Speed Tx Transmitters which are deployed near the water meter/s or from other Speed TxRx units which are in Transmit mode. The received data is processed differently whether the unit is connected to a Repeater control device or as a front-end to a Concentrator. When connected to a Repeater, the received data is processed in the Repeater’s controller.
Speed TxRx User Manual 2.2 Block Diagram Description 2.2.1 General Figure 2-1 describes the block diagram of the Speed Tx Rx unit. RF is received or transmitted from either antennas upon the controller selection. Two antennas are used to improve performance in urban environment where shadowing, due to tall buildings, generates sever multipath effect. This effect can reduce the received signal by more than 30dB, thus by switching antennas periodically the transceiver improves reception. 2.2.
Speed TxRx User Manual Figure 2-2: Speed TxRx Block Diagram Transceiver Enclosure 433.92MHz BPF & LNA 10.7MHZ 1st IF SAW filter 455KHz 2nd IF Dipole FM Demodulator VCO 423.22MHz LO Antenna Receiver Crystal 13.56MHz VCO Crystal 10.245MHz Coaxial Cables Diversity switch T/R switch 433.92MHz Antenna VCO Dipole Phase Locked LOOP(PLL) MC13176 Controller Harmonic Filter & Attenuator Crystal 13.56MHz Internal adjustment range 433.
Speed TxRx 2.2.3 Receiver The input signal from either ports is routed with the T/R switch to the receiver section. The signal is filtered, amplified and further filtered by a high selectivity SAW filter. Local Oscillator leakage is greatly reduced by the reverse isolation of the amplifier and mostly by the Narrow band SAW filter. The Receiver is a double down converter super_het receiver.
Speed TxRx User Manual Chapter 3 Technical Characteristics 3.1 Technical Specification 3.1.1 Electrical Transmitter Max. Effective Radiated Power (ERP) including Dipole antennas 1.4µW peak (Complies with FCC 15.231(e)) Output frequency 433.92 MHz. Crystal Controlled. Carrier wave modulation 2 levels FSK with a subcarier Bandwidth 50KHz max. At –20dBc points Transmit Duration 0.8 Sec Max. Duration between Transmissions 30 Seconds Min.
Speed TxRx User Manual General 3.1.2 Interface to Repeater/Concentrator Shielded 5-wire cable Antennas Half wavelength Dipoles, 50ς better than 2:1 VSWR Power Supply 110V AC / 12V DC UL Certified Converter Physical Operating temperature -10÷+60°C Water Resistance Splash resistance (IP-64) Length 160 mm. Width 120 mm. Depth 75 mm. Weight (excluding Antennas) 420 gr. Enclosure An inner shielded steel box in a plastic box housing.
Speed TxRx 3.2 User Manual Label Contents FCC ID: MLLSPEEDTRD433L1 Model: Speed TxRx_433_L1 S/N: YY-nnnnnn Miltel Communications Ltd. Made in Israel This device complies with Part 15 of the FCC rules. Operation is subjected to the following 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 Miltel Communications Ltd.
Chapter 4 Installation Instructions 4.1 General The Speed TxRx Transceiver should be installed only by a professional technician. Once installed, the Antennas and Coax Cables should not be modified as this may effect performance and will violate the FCC requirements. The Speed TxRx unit should be installed in a secure location so that it is not accessible. 4.2 Installation Before installing the Speed TxRx Transceiver complete the antenna installation.
