Instruction manual

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5
MODEL 708 TECHNICAL SPECIFICATIONS
Frequency Response (with pre-
emphasis turned OFF, or through
appropriate de-emphasis network):
±0.5dB, 20Hz–15kHz; –1dB or
less at 16kHz, –60dB or better at
19kHz.
Stereo Separation (LàR or RàL):
>65dB, 20Hz–16kHz.
Distortion (1dB below 100%
modulation):
<0.1% THD in demodulated
audio.
Noise:
Better than 80dB below 100%
modulation in demodulated audio,
20Hz–16kHz. 38kHz residual and
“digital” noise above 54kHz,
–70dB or better.
Crosstalk (MàS or SàM):
Linear and nonlinear crosstalk,
–50dB or better.
Stereo Pilot:
19kHz, ±1Hz; injection level
adjustable between 7% and 12%,
relative to 100% modulation.
Program Line Inputs:
Active-balanced/bridging;
accommodate input levels between
–10dBu and +20dBu, equivalent
to 100% modulation.
SCA / RDS Inputs:
10K-ohms, unbalanced; accept
SCA or RDS subcarriers at 0dBu
or greater levels for nominal 5% to
10% subcarrier injection, relative
to 100% modulation.
Pre-emphasis:
May be jumpered for 75µs or 50µs
characteristic; may be switched
OFF at front-panel.
Composite Processor:
Adjustable between 0dB and 3dB
clipping of the 100%-modulated
multiplex waveform prior to
19kHz pilot insertion.
Composite (Multiplex) Output:
Adjustable between 2V p-p and
8V p-p; 75-ohm source impedance.
Digital Synthesis Sampling Rate:
608kHz (16X subcarrier
oversampling).
Power Requirements:
105–130VAC or 210–255VAC,
50/60Hz; 15 watts.
Size and Weight:
1¾”H x 19”W x 7”D (1U);
7 lbs (shipping).
BLOCK DIAGRAM
A simplified Block Diagram of the Model 708 is shown on the following
page. Generator circuitry is explained in detail under Circuit
Descriptions, Section V, which references Schematic Diagrams found in
the Appendix, Section VI.
PATENT NOTICE
Low-pass filter overshoot compensation circuitry used in the Inovonics
708 is protected under U.S. Patent No. 4,737,725.