The 718 “DAVID-III” combines comprehensive multiband audio processing with a digital-synthesis stereo generator for unparalleled performance and great value. Pulse-width-modulation (PWM) techniques ensure rock-stable operation and a very competitive, yet effortless sound. Density and equalization adjustments allow the broadcaster to tailor the ‘signature’ of the on-air sound. Proprietary PIPP* final limiting and an adjustable composite clipper guarantee full carrier modulation for any program audio source or characteristic.
>55dB, 50Hz-15kHz (typically 60-70dB)
Better than 70dB below 100% modulation in decoded L/R audio. Individual digital noise components above 54kHz are –70dB or better.
<0.5%THD in baseband and subcarrier at 95% modulation with PIPP* limiter defeated; <1.5% at any level of modulation with PIPP* limiter engaged.
CROSSTALK (M/S or S/M)
Nonlinear crosstalk is better than –50dB, 50Hz-15kHz. Linear crosstalk (through processing and filters) is better than –40dB.
75μs or 50μs selected by internal jumpers.
(*Polarity Independent Peak Processing) Proprietary circuitry assures full carrier deviation by program audio regardless of signal asymmetry. The limiter may be defeated with a front-panel switch.
The 7-pole, phase-corrected, active-elliptic LPF includes proprietary overshoot compensation.
Baseband clipping may be adjusted between 0dB and 3dB. Clipping is performed prior to pilot injection.
19kHz, ±1Hz. Pilot is adjustable between 6% and 12% relative to 100% modulation.
DIGITAL SYNTHESIS SAMPLING RATE
608kHz (16X subcarrier oversampling)
The 75-ohm, unbalanced BNC output is variable between 1V p-p and 10V p-p with reference to 100% carrier modulation.
105-130VAC and 210-260VAC; 50/60Hz; 20W.
SIZE AND SHIPPING WEIGHT
23” x 16” x 2” (2U); 8 lbs
584mm x 406mm x 51mm ; 3.6 kg