The 222 was originally developed as a "post-processor" to ensure US broadcasters' compliance with FCC-mandated occupied-bandwidth regulations. It incorporates a fast, asymmetrical peak limiter, independent pre-emphasis-protection limiting, and a very sharp-cutoff low-pass filter with proprietary overshoot control. The 222 finds ready application in a wide variety of AM broadcast situations. In addition to the NRSC 10kHz cutoff for medium-wave AM broadcasting in the US, any high-frequency protection characteristic between 4.5kHz and 15kHz can readily be accommodated to meet other domestic and overseas needs. Though the 222 is intended to provide basic final limiting, a "floating platform" release characteristic yields sufficient program dynamics compression that often the unit can be run "barefoot" between the console and transmitter with good results.
Meets US (NRSC-compliant) and overseas AM transmission specifications
Separate pre-emphasis protection limiter
Active multipole low-pass filtering
Feedforward Pulse-Width-Modulation (PWM)
Built-in asymmetrical peak controller
Optional cutoff frequencies available (9kHz, 6.4kHz & 5kHz)