Frequency-Programmable Transceiver

The new Multi-Use Radio Service (Mini-MURS) NiM1B-154.570-5-12.5-MURS is a frequency-programmable narrow band transceiver that offers a low-power, reliable data link in a Lemos /Radiometrix transceiver standard pinout and footprint. It’s suitable for licensed and unlicensed VHF allocations, FCC part 90 and part 95.LEMOS NiM1BR-high-res-fv

The transceiver’s features include the following: conforms to EN 300 220-3 and EN 301 489-3 (10-mW version only); compliant with FCC part 95 (MURS); standard frequency 154.570 MHz or 154.600 MHz (reprogrammable); data rates up to 5 kbps for standard module; usable range over 1 km; feature-rich interface (true analog and/or digital baseband); and more.

Technical specifications:

  • Fully integrated sigma-delta PLL synthesizer based design
  • High stability TCXO reference
  • Data bit rate: 5 kbps max.
  • Transmit power: +13 dBm (20 mW)
  • Image rejection: greater than 70 dB
  • Receiver sensitivity: –120 dBm (for 12-dB SINAD)
  • RSSI output with greater than 50-dBm range
  • Supply: 3.3 V – 15 V at 30 mA transmit, 18 mA receive
  • Dimensions: 33 × 23 × 11 mm (fully screened)
  • Evaluation platforms: NBEK + BiM/SMX carrier

Source: Lemos International

New Frequency-Programmable, Narrow-Band Transmitter

Leading RF module designer and manufacturer Lemos International/Radiometrix recently launched a new range of flexible, frequency-programmable, RF power adjustable radios. The new NTX2B Transmitter offers industry-leading true Narrow-Band FM performance. It is available on user/factory-programmable custom frequencies between 425 and 470 MHz. Superseding the popular NTX2, the new transmitter offers greater stability and improved performance due to VCTCXO reference. The NTX2B provides users with the ability to dynamically reprogram the module via the microcontroller UART to other channel frequencies in the band or store new frequency/power settings on EEPROM.

Source: Lemos International

Source: Lemos International

The standard NTX2B version is a 10-mW, 25-kHz narrow-band Transmitter with data rates up to 10 kbps and is available on 434.075 and 434.650 MHz European SRD frequencies and 25 mW on 458.700 MHz for the UK. The NTX2B is also available with 12.5- or 20-kHz channel spacing for licensed US FCC Part 90 or legacy European Telemetry/Telecommand bands. The NTX2B features an internal LDO voltage regulator that enables the transmitter to be operated down to 2.9 V and up to 15-V voltage supply at a nominal current consumption of 18 mA and less than 3 µA in power-down mode, which can be enabled within 5 ms. NTX2B can transmit both digital and 3-VPP analog signals. Offering greater range than wideband modules, the transmitter can be paired with the new NRX2B receiver for a usable range of over 500 m, which is ideal for performance-critical, low-power wireless applications, including security, sensor networks, industrial/commercial telemetry and remote control.

Source: Lemos