THIS PRODUCT IS NO LONGER IN PRODUCTION
The Model 235 incorporates all audio processing needs for AM broadcasting in a single, easy-to-use package. "Gain-riding" AGC is followed by variable low- and high-frequency EQ, 3-band compression, an asymmetrical, integrated limiter/clipper peak controller, and a low-pass function that satisfies NRSC or other "audio mask" specifications. A rear-panel RS-232 data port allows the processing presets to be programmed or updated by computer or modem; the necessary software is included.
- Doug Irwin, CPBE AMD DRB There’s an Art to On-Air Processing
±1dB, 50Hz–9.7kHz* (taken through NRSC de-emphasis network and with processor EQUALIZATION set “flat”). * US NRSC (10kHz) version. Alternative cutoff frequencies for CCIR channel spacings and for various short-wave protocols are optionally available at slight additional cost.
Typically under 1% THD at any PROGRAM DENSITY setting, and at PEAK PROCESSING settings which maintain negligible clipping depth.
Better than 60dB below full carrier modulation (assuming NRSC de-emphasis).
The US version follows the “truncated” 75μs curve specified by the NRSC transmission standard. Alternative versions employ pre-emphasis appropriate to the cutoff frequency.
HF: –3dB, 0dB (flat), +3dB, +6dB, MAX. (These figures are independent of, and in addition to, the NRSC or alternative fixed pre-emphasis).
LF: –9dB, –6dB, –3dB, 0dB (flat), +3dB
PROGRAM DENSITY controls “blending” within the triband compression section, as well as the compressor release characteristic. Eight incremental settings range from a slow, single-band function to fast, fullyindependent 3-band operation.
PEAK PROCESSING programs the action and interrelation of the peak limiter and clipper circuits in eight MIN to MAX increments.
Active-balanced, bridging; accepts nominal program line levels between –15dBu and +15dBu.
Active-balanced, 200-ohm resistive source; delivers 0dBm to +15dBm into 600 ohms.
Positive peak amplitude is continuously variable between +100% and +130%.
An RS-232 serial data port (DB9 connector) allows all processing presets to be programmed by an IBMcompatible computer, directly or via modem. Supplied software runs under Microsoft Windows® 95/98.
105-130VAC and 210-260VAC; 50/60Hz; 20W.
23” x 16” x 2” (2U); 10 lbs
584mm x 406mm x 51mm ; 4.5 kg