- 708's Features:
- Digital synthesis of the stereo pilot and multiplex signals
- Overmod protection, low-pass filtering and composite clipping
- Front-panel metering for easy setup
- Adjustable pre-pilot composite processing
- Internal combining for RDS/RBDS and SCA subcarriers
- 708's Specifications:
- FREQUENCY RESPONSE: ±0.5dB, 20Hz-16kHz.
- STEREO SEPARATION: >60dB (typically 65-70dB), 50Hz-15kHz.
- NOISE: Better than 75dB below 100% modulation in baseband and subcarrier; “digital” noise components above 54kHz are –70dB or better. •DISTORTION: <0.15% THD in baseband and subcarrier at 95% modulation.
- CROSSTALK: (M/S or S/M) “Nonlinear” crosstalk is better than –50dB, 50Hz-15kHz; “linear” crosstalk is better than –45dB with pre-emphasis switched off.
- STEREO PILOT: 19kHz, ±1Hz; level may be adjusted between 6% and 12%, relative to 100% modulation. <1% THD in pilot signal.
- PROGRAM LINE INPUTS: (Left and Right) Active-balanced, bridging; accept limited program audio levels between –15dBu and +15dBu, corresponding to 100% modulation.
- SUBCARRIER INPUTS: Two unbalanced inputs accommodate SCA or RDS/RBDS subcarriers at levels between –20dBu and 0dBu for nominal 5-10% injection.
- PRIMARY LOW-PASS FILTERING: 7-pole, phase-corrected, active-elliptic filter with proprietary overshoot compensation (defeatable). –60dB or better at 19kHz and above.
- PRE-EMPHASIS: May be jumpered for 75μs or 50μs characteristics; may be defeated by front-panel switch.
- COMPOSITE PROCESSING: A composite clipper acts on the multiplex signal prior to injection of the stereo pilot and any auxiliary subcarriers. Clipping is adjustable between 0dB and 3dB.
- COMPOSITE OUTPUT: Unbalanced output with 75-ohm source impedance. 100%-modulation level is adjustable between 1V p-p and 8V p-p.
- DIGITAL SYNTHESIS SAMPLING RATE: 608kHz (16X subcarrier oversampling).
- POWER REQUIREMENTS: 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
