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THIS PRODUCT IS NO LONGER IN PRODUCTION
The Model 708 is a standalone stereo generator intended for use with an external FM audio processing system. The composite multiplex signal, including the stereo pilot, is generated with digital synthesis techniques to assure optimum stereo separation without need for calibration adjustments.
Additionally, the 708 provides internal combining for one or two SCA or RDS/RBDS subcarriers.
60dB (typically 65-70dB), 50Hz-15kHz
Better than 75dB below 100% modulation in baseband and subcarrier;“digital” noise components above 54kHz are –70dB or better.
<0.15% THD in baseband and subcarrier at 95% modulation
“Nonlinear” crosstalk is better than –50dB, 50Hz-15kHz
“Linear” crosstalk is better than –45dB with pre-emphasis switched off.
19kHz, ±1Hz; level may be adjusted between 6% and 12%, relative to 100% modulation. <1% THD in pilot signal.
Active-balanced, bridging; accept limited program audio levels between –15dBu and +15dBu, corresponding to 100% modulation.
Two unbalanced inputs accommodate SCA or RDS/RBDS subcarriers at levels between –20dBu and 0dBu for nominal 5-10% injection.
7-pole, phase-corrected, active-elliptic filter with proprietary overshoot compensation (defeatable). –60dB or better at 19kHz and above.
May be jumpered for 75μs or 50μs characteristics; may be defeated by front-panel switch.
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.
Unbalanced output with 75-ohm source impedance. 100%-modulation level is adjustable between 1V p-p and 8V p-p.
608kHz (16X subcarrier oversampling)
105-130VAC or 210-255VAC, 50/60Hz; 10W.
13/4”H x 19”W x 6”D (1U); 7 lbs.