THIS PRODUCT IS NO LONGER IN PRODUCTION
The Model 260 satisfies basic processing needs in educational FM, TV sound and similar set-and-forget applications. Final limiting is performed in a split-band arrangement to protect the transmission pre-emphasis characteristic.
User controls are restricted to input and output level adjustments; there are no controls affecting the "sound" of the processor.
The 260 supplies comprehensive processing, or any of the functions may be defeated with jumpers on the rear panel. This allows the 260 to serve as an AGC-only, a peak controller-only, etc.
Better than 75dB below 100%-modulation output level, 10Hz-15kHz
<0.5%THD, 20Hz-15kHz; <0.25%THD, 50Hz-10kHz
Better than –60dB, 10Hz-10kHz
(L/R) Active-balanced, bridging; accept program audio levels between –20dBu and +10dBu.
(L/R) Active-balanced, 600-ohm source impedance; deliver 0dBm to +15dBm into 600-ohm loads.
Gating inhibits AGC ‘hunting’ and compression release during brief pauses in the input program. Extended program loss slowly returns circuit gains to resting values.
Slow-AGC erases long-term program level variations for more consistent compression and limiting action. AGC may be independently defeated by grounding a rear-panel terminal. Correction range: ±12dB; correction rate: 0.5dB/sec
Compression and limiting share a common split-spectrum gain control circuit. The two functions are separated by a time-domain “floating platform” attack/release characteristic. Compression or total dynamic reduction may be independently defeated by grounding rear-panel terminals.
Independent high frequency gain reduction follows the 75µs pre-emphasis characteristic. (50µs optionally available.)
Active only on limiter overshoots that would exceed 100% modulation. Conforms to pre-emphasis characteristic.
Front-panel indicator flashes when AGC correction exceeds ±9dB, or when “dead air” exceeds 10 seconds.
105-130VAC or 210-255VAC, 50/60Hz; 20W
1-3/ 4”H x 19”W x 8”D (1U); 12 lbs.