Wirless Data Links (Radios)

Sample of prior work showing our RF design capabilities: S-Band 802.11 MODEM Transceiver Specifications (Continuous tuning from 2.2 GHz to 3.0 GHz ).

Transmitter:

  • Power output: 1 Watt into 50 ohms
  • Data Rate: 1 or 2 Mbit/second
  • Modulation: 2 or 4 level FSK, Analog FM
  • Bandwidth: 1 MHz
  • Frequency Agile Control: Crystal Controlled PLL Synthesizer
  • Fast Tuning: Continuous from 2.2 GHz to 3.0 GHz, designed for frequency hopping Spread Spectrum operation
  • Monitoring outputs: Buffered and filtered Forward and Reverse Power and several test points
  • Construction: Single Sided Surface Mount parts
Graph

Representative output signal spectrum when modulated with an oscillatory 2-FSK data stream

Receiver:

  • Sensitivity: -92 dBm using 2 level FSK
  • Stability: Unconditionally Stable
  • Input Noise figure: Less than 1.5 dB from 50 ohm source antenna
  • System Noise figure: Less than 6 dB from 50 ohm source antenna
  • IP3: +5 dBm
  • First IF: UHF with 4 pole filter
  • Second IF: HF with 8 pole 1 MHz wide filter and group delay equalizer
  • First LO: Agile PLL Synthesizer with continuous coverage from 2.2 GHz to 3.0 GHz
  • Second LO: Multiplied Crystal
  • First IF Image Rejection Ratio: more than 80 dB
  • Second IF Image Rejection Ratio: more than 60 dB
  • Adjacent Channel Rejection Ratio: more than 66 dB
  • Second Adjacent Channel Rejection Ratio: more than 80 dB
  • Outputs: Buffered and filtered FM Demodulator and RSSI and several test points
  • Construction: Single Sided Surface Mount parts
Modem

NOTE: In the picture above, the resolution was deliberately reduced to protect some of MEI’s Intellectual Property. Please note that the technologies used in the above device are Patent pending.

MODEM and Transceiver Controller

  • Firmware controlled data rate, modulation levels, shape and filtering
  • Firmware controlled transmitter and receiver frequencies
  • Several A/D and D/A converters to send and receive analog info from the transceiver and monitor all test points
  • Construction: Double Sided Surface Mount parts
Modem 2

NOTE: In the picture above, the resolution was deliberately reduced to protect some of MEI’s Intellectual Property. Please note that the technologies used in the above device are Patent pending.

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