DRT1-23XX

This digital radio module supplies the transmitter function in radios operating in the 21.2 to 23.6ÊGHz band. The source provides close to 100 mW output power over the temperature range of -30°C to +70°C. Included within the transmitter module is a muting function to reduce output power by 50 dB for "hot standby" applications. An internal voltage controlled attenuator function is optional allowing for 30 dB dynamic range adjustment.

This digital radio transmitter module is designed for medium data rate point to point communication systems operating at 23ÊGHz. This DRT1-23XX offers excellent phase noise performance and can be easily phase locked to a frequency reference. The transmitter module provides +20 dBm of output power, ideal for use in radios using 2 and 4 level FSK modulation. The DRT1-23XX features an ultra low noise silicon bipolar VCO operating in the S/C band. A portion of the oscillator output is coupled off and is applied to a frequency divider network.

The low frequency output (less than 1 GHz) from the frequency divider can be easily used to phase lock the source. The main oscillator output is applied to a frequency multiplier network to produce the desired output frequency in the 23 GHz range. The output of this network is filtered then amplified by a GaAs MMIC device to produce the required output power. A detected sample of the output signal is provided to facilitate built in test of key radio components.