-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 controllerThe 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. (PWM) control.
- Distortion: Less than 0.2% THD, 10Hz cutoff with Peak Limiter OFF; less than 1% THD, 200Hz cutoff with Peak Limiter ON
-Noise: Better than 75dB below full carrier modulation
-Fixed Pre-Emphasis: Appropriate to the service and the cutoff frequency
-Input: Active-balanced, bridging; accepts nominal program line levels between -15dBu and +15dBu.
-Output: Active-balanced, 600-ohm resistive source; delivers 0dBm to +15dBm into 600 ohms.
-Output Asymmetry: Positive peak amplitude is continuously variable between +100% and +130% of the negative peak value
-Power Requirements: 210-260 VAC; 50/60Hz; 20W