Specifications
Performance
Frequency Response
No Optional Filter (PROOF mode): Better than ±1.0dB, 50-12,000Hz.
NRSC Filter Installed (PROOF mode): Better than ±1.0dB, 50-9,500Hz.
ITU-R Filter Installed (PROOF mode): Better than ±1.0dB, 50-4,500Hz. (or 5,000Hz, 5,500Hz, or 6,000Hz, as ordered).
Noise: >65dB (referenced to 100% modulation), 30-20,000Hz.
Total System Distortion
PROOF mode, 100% modulation: <0.2% THD, 50-9,500Hz (or to cutoff frequency of CCIR filter).
Stereo Separation
PROOF Mode: >25dB, 50-5,000Hz; 30dB typical.
Dynamic: >30dB typical.
Installation
Audio Input
Configuration: Left and right.
Impedance: >10k ohm load impedance, electronically-balanced with true instrumentation amplifier.
Sensitivity: -30dBu to +10dBu to produce 10dB AGC gain reduction.(0dBu=0.775Vrms).
Connector: Barrier Strip (#6 screw), EMI suppressed.
Audio Output
Configuration: Outputs for two transmitters, each with independent TX EQ and 18-turn screwdriver-adjust OUTPUT ATTENUATOR control. Stereo outputs are left-and-right or sum and difference, selectable with internal jumpers.
Impedance: 290 ohm source impedance, independent of OUTPUT ATTEN setting, electronically-balanced to ground. Recommended load impedance 600 ohm ±20%.
Peak Output Level: Adjustable from 0 to >+20dBu with 18-turn OUTPUT ATTEN controls (0dBu=0.775Vrms).
Connector: Barrier Strip (#6 screw), EMI suppressed.
Remote Control
Function: Switches one of four sets of transmitter equalizer controls: DAY/TX1, DAY/TX2, NIGHT/TX1, NIGHT/TX2.
Voltage: 6 to 24V AC or DC, momentary or continuous, optically-isolated. A voltage source is supplied on the rear panel.
Connector: Barrier strip (#6 screw), EMI suppressed.
Power
Requirements: 115/230VAC (switch-selectable), ±15%, 50-60Hz, 38VA.
Connector: IEC; detachable 3-wire power cord supplied. AC is EMI suppressed.
Ground: Circuit ground is independent of chassis ground; both appear on terminal strip on rear panel for strapping as required.
Environmental
Operating Temperature Range: 0-50 degrees C. (32-122 degrees F.)
Humidity: 0-95% RH, non-condensing.
Dimensions
19 inches (48.3cm) wide, 7 inches (17.8cm) high, 12.5 inches (31.2cm) deep. Requires 4 rack units.
Weight
9100B2 (stereo): 27lb (12kg) net; 41lb (19kg) shipping.
Access
Circuitry (except for power supply regulator) is on plug-in cards. All circuitry and user setup adjustments available from front panel without removing unit from rack. Control access door is fitted with a lock to prevent unauthorized adjustments.
Circuit Characteristics
Input Conditioning
High-Pass Filter: Third-Order elliptical with 50Hz cutoff and 0.5dB passband ripple; deep 25Hz notch to protect C-QUAM pilot tone and to reject automation cuetones; -0.5dB @ 50Hz, -45dB @ 25Hz, -27dB @ 20Hz. Low-Pass
Filter: Rolls off frequencies above ordered cutoff at a rate exceeding 24dB/octave.
Phase Scrambler: All-pass network makes peaks more symmetrical to best utilize the capabilities of the processing.
Broadband AGC
Attack Time: SINGLE, approximately 200ms; MULTI, program-controlled, varies according to program dynamics and amount of gain reduction.
Release Time: SINGLE, approximately 3dB/second; MULTI, program-controlled, varies according to program dynamics and amount of gain reduction.
Compression Ratio: Greater than 10:1.
Threshold of Compression: Controlled by input attenuators. Stereo Operation: Gains of left and right channels track to avoid stereo perspective shift.
Total Harmonic Distortion (at VCA output, OPERATE mode): Less than 0.05% 50-9,500Hz, +10 to -15dB gain reduction.
Available Gain Reduction: 25dB.
Gating: Gain will freeze, then drift slowly to 10dB gain reduction, if input level drops below the threshold set by front panel GATING control.
Bass Receiver Equalizer
Type: Quasi-parametric second-order peak boost.
Control: Bandwidth variable from 4 to 0.5 octaves (Q=0.3 to 1.4), TUNING variable 70 to 110Hz, EQ boost variable 0 to +6db.
High Frequency Receiver Equalizer
Curve Shape: Determined by plug-in "Personality Module." Four supplied.
Curve Characteristics: BLUE module: NRSC-standard modified 75microseconds pre-emphasis, +2.5dB @ 2kHz, +6.9dB @ 5kHz, +10dB @ 10kHz. RED, YELLOW, and GREEN: Three families of third-order shelving curves whose ultimate HF boost is adjustable with the HF EQ controls.
Crossover Filters (US Patent No. 4,412,100)
Filters: 150Hz low-pass, 420Hz band-pass, 700Hz band-pass, 1.6kHz band-pass, 3.7kHz band-pass, 6.2kHz high-pass.
Selectivity: 18dB/octave.
Topology: Parallel "distributed crossover."
Combined Frequency Response-Static: ±0.5dB, 50-9,500Hz.
Combined Frequency Response-Dynamic: Phase interaction between filters will not cause audible dips in frequency response.
Six-Band Limiter
Attack Time: Program-controlled, adjusted according to band frequency.
Release Time: Program-controlled, adjusted according to band frequency. Employs delayed release for distortion reduction.
Gain Reduction: Bands 1-5, 0-25dB; Band 6, 0-30dB.
Distortion Cancellation: All clipper-induced distortion in upper four bands canceled better than 30dB below 1.8kHz. Additional distortion reduction provided as a function of frequency in each band.
Variable-Gain Element: Proprietary Class-A VCA.
Stereo Control Circuitry
C-QUAM Stereo-75% Modulation Limiter: Jumperable in/out. Asymmetrical clipping in L and R channels. Clipping overdrive under conditions of high separation is prevented by dynamic gain reduction in L-R channel prior to L and R clipping (dynamic blend). L-R gain reduction is constrained to 6dB or less as required by program material. Mono receivers are unaffected, retaining full loudness.
Stereo Enhancer: Control on card. Permits increasing gain of L-R channel up to 6dB.
Stereo L-R High-Pass Filter: Jumperable in/out. 200Hz, 30dB/octave filter in L-R channel, phase-matching all-pass filter in L+R channel.
Output Low-Pass Filter
Type: NRSC units are provided with three switchable filters, 12kHz, 10kHz NRSC-standard, and 5.0kHz. ITU-R units are provided with two switchable filters, CCIR/EBU (4.5kHz, 5.0kHz, 5.5kHz, or 6.0kHz, as ordered), and 12kHz. All filters phase-corrected and overshoot-free when observed at processor output.
Characteristic-NRSC: Non-Linear over shoot-compensated, ±0.75dB to 9.6kHz. Guaranteed to meet the NRSC-1 power spectrum specification without the need for further low-pass filtering prior to the transmitter.
>Characteristic-IT-R: Non-linear overshoot-compensated, ±0.75dB to specified filter cutoff frequency. Guaranteed to meet the CCIR power spectrum specification (Recommendation 328-5) without the need for further low-pass filtering prior to the transmitter.
Characteristic-12kHz: Fifth-order elliptical filter, -0.5dB @ 12kHz.
Characteristic-5.0kHz: Auxiliary Filter Supplied with NRSC Units: 30dB/octave, -0.5dB @ 5kHz.
Switching: Jumper-selectable to follow DAY/NIGHT switching in any combination.
Transmitter Equalizer
Low Frequency Tilt Equalizer: Proprietary phase/magnitude compensation introduces adjustable positive slope tilt to the output waveform to cancel negative-slope tilt typical of older-technology transmitters. Independent control of very low frequency compensation available to avoid saturation and non-linear low frequency power handling capacity.
High Frequency Shelving Equalizer: Adjustable breakpoint shelving equalizer creates controlled undershoots in high frequency transient waveforms to prevent RF envelope overshoot due to excessive Q in transmitters, phasors, and/or antenna systems, or due to poor transient response in audio or modulator stages.
High Frequency Delay Equalizer: Introduces added time delay selectively into the spectrum to compensate for non-constant group delay in the transmitter/antenna system, thus optimizing transient response by creating approximately constant time delay at all frequencies within the audio bandwidth.
Controls: Four independent sets provided, DAY/TX1, DAY/TX2, NIGHT/TX1, NIGHT/TX2.
Switching: From the front panel or remotely.
Indication: Front panel LEDs.
Proof Test Mode
AGC and Six-Band Limiter: Defeats gain reduction. Circuitry is not bypassed.
Warranty
One year, parts and labor. Subject to limitations stated in our Standard Warranty.
Specifications subject to change without notice.