Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com Issue 1, 30 July 2012 NTX2 / NRX2 UHF Narrow Band FM TX & RX The NTX2 transmitter and NRX2 receiver offer a low power, reliable data link in a Radiometrix SIL standard pin out and foot print. This makes the NTX2/NRX2 pair ideally suited to those low power applications where existing single fr equency wideband UHF modules have insufficient range. NTX2 HP (25mW) variant can be used in applications where greater radiated power is desired (for example when space limitations d ictate the use of small and inefficient antenna, or in countries where the extra Figure 1: NRX2-434.650-10 NTX2-434.650-10 p ower is permitted) Features Conforms to ETSI EN 300 220-3 (radio) and EN 301 489-3 (EMC) Standard frequencies: 434.075MHz, 434.650MHz and 458.700MHz Custom frequencies available in 433MHz (EU) and 458MHz (UK) band Data rates up to 10kbps Usable range over 500m 25kHz Channel spacing Longer range compared to Wide Band FM modules Available for licence-exempt operation in the 433MHz (EU) and 458MHz (UK) bands, the NTX2 & NRX2 modules combine effective screening with internal filtering to minimise spurious radiation and susceptibility thereby ensuring EMC compliance. They can be used in existing low data rate (<10kbps) applications where the operating range of the system using TX2 transmitter and RX2 receiver need to be extended. They are particularly suitable for point-to-point and point-to-multipoint wireless links where longer ranges are required at low data rates. Technical Summary Transmitter NTX2 3 stage crystal controlled VCXO Supply 2.9V - 15V 18mA (internal 2.8V voltage regulator) Data bit rate: 10kbps max. Transmit power: +10dBm (10mW) or +14dBm (25mW HP variant) Receiver NRX2 Double conversion FM superhet SAW band pass filter, image rejection: 50dB Intermediate Frequencies (IF): 21.4MHz, 455kHz Supply range: 2.9V - 15V 14mA (internal 2.8V voltage regulator) Data bit rate: 10kbps max. Receiver sensitivity: -118dBm (for 12dB SINAD) / -112dBm (for 1ppm BER) Local Oscillator (LO) re-radiation: <-60dBm Adjacent Channel: -70dBm Blocking: -84dB Evaluation platforms: NBEK + SIL carrier Radiometrix Ltd., NTX2/NRX2 data sheet Page 1 23.5mm Functional description The NTX2 transmitter consists of a Frequency Modulated (FM) Voltage Controlled Crystal Oscillator (VCXO) feeding a frequency multiplier with two stage amplifier and RF filter. Operation can be controlled by the EN (Enable) line, the transmitter achieving full RF output typically within 5ms of this line being pulled high. The RF output is filtered to ensure compliance with the appropriate radio regulations and fed to the 50 antenna pin. The NRX2 module is a double conversion NBFM superhet receiver capable of handling data rates of up to 10kbps. It will operate from a supply of 2.9V to 15V and draws 14mA when receiving. A signal strength (RSSI) output with greater than 60dB of range is provided. The SIL style NRX2 measures 47 x 17 x 8 mm excluding the pins. NTX2 Transmitter Figure 2: NTX2 block diagram 43mm 8mm 32mm 15mm NTX2 15.24mm (0.6 ) 1 = RF gnd 2 = RF out 4 5 1 2 3 7 6 3 = RF gnd 4 = En 5 = Vcc 6 = 0V 7 holes of 0.7mm dia. 7 = TXD pin spacing 2.54mm (0.1 ) Figure 3: NTX2 pin-out and dimension User interface NTX2 pin Name Function 1, 3 RF gnd RF ground is internally connected to the module screen and pin 6 (0V). These pins should be directly connected to the RF return path - e.g. coax braid, main PCB ground plane etc. 2 RF out 50 RF output to the antenna 4 EN Pull high to enable Transmitter (3V CMOS logic) 5 Vcc 2.9 15V DC power supply 6 0V Ground 7 TXD DC coupled input for 3V CMOS logic. R = 100k in Notes: 1. EN pin should not be left floating 2. Pinout footprint is as TX1H. 3. Compatible with RX2M, RLC2 and NRX2 Radiometrix Ltd., NTX2/NRX2 data sheet Page 2
