Featuring Rockwell Collins' advanced speech processing technology, the VHF-22/422 provides flight crews with unparalleled audio quality, ensuring clear communication even in the most crowded ATC environment. These advanced digital radios feature a number of industry-leading capabilities, including microprocessor control of channel selections and diagnostic routines, single-crystal frequency synthesis and a pulse width modulator for optimal efficiency. All Rockwell Collins Pro Line Radio Sensors are designed to be compliant with 8.33 kHz channel spacing regulations.