Specifications
PERFORMANCE
Performance meets or exceeds all specifications for the BTSC system, as defined by FCC OET-60A and EIA
Multichannel Television Sound: BTSC System Recommended Practices. All measurements made with signal applied directly to 8185A audio inputs; dbx N/R IN unless otherwise noted.
Frequency response: ±0.5dB, 30-14,000Hz; <1 dB down at 15kHz.
Noise: <-82dB, referenced to 100% modulation.
Total system distortion-BTSC mode (N/R in): <0.1% THD, 50-10,000Hz;<0.2% THD, 10-15Hz<0.2% SMPTE IMD; 0.08% typical.
Total system distortion-75us equivalent mode: <0.05% THD, 50-15,000Hz. <0.05% SMPTE IMD; 0.03% typical.
System BTSC separation-tone (10% 75us equivalent-input modulation, N/R in): >35dB, 50-10,000Hz; >30dB, 10-14kHz; >40dB, 50-10,000Hz typical.
System BTSC separation-pink noise (30% composite modulation, N/R in): >40dB, 50-10,000Hz; >35dB, 10-14kHz; >45dB, 50-10,000Hz typical.
BTSC separation of monitor decoder alone-tone (10% 75us equivalent-input modulation, N/R in): >40dB, 50-10,000Hz; >35dB, 10-14kHz.
System group delay-75us equivalent mode: Constant ±5%, 50-12,000Hz.
EXTERNAL AUDIO INPUT
For audio processors other than Orban 8182A OPTIMOD-TV.
Configuration: Left and right, flat or preemphasized.
Impedance: >10k ohm load impedance, electronically balanced by means of true instrumentation amplifier. Requires balanced source £600 ohms. Common mode rejection >60dB at 60Hz.
Sensitivity: +10dBm at 100Hz applied in-phase to both inputs produces ±25kHz main channel deviation (100% modulation).
Connector: Barrier strip (#5 screw), EMI suppressed.
INTERCONNECT TO 8182A OPTIMOD-TV AUDIO PROCESSOR
SIGNALS: Left and right 8182A compressor output to 8185A six-pole filter input; 8185A left and right six-pole filter output to 8182A HF limiter input; 8182A left and right pre-emphasized output to 8185A input.
Connector: 14 pin connector to mate with shielded jumper cable supplied with 8185A.
SYNC REFERENCE INPUT
Impedance: 20k ohms, balanced. Switchable 75 ohm termination.
Level: Composite video or sync, 0.6 to 1.6Vp-p; 1V nominal.
Connector: Two BNC connectors, looped-thru, shell insulated from chassis.
SAP SUBCARRIER INPUT
Impedance: 10k ohms, unbalanced.
Sensitivity: 1.5Vp (3.0Vp-p) produces ±15kHz carrier deviation (100% modulation).
Connector: BNC; shell floating over chassis ground, capacitively coupled to chassis through approximately 500pF for EMI suppression.
COMPOSITE OUTPUT
Impedance: Voltage source (0 ohms) or 75 ohm source impedance (selectable with internal jumpers), single-ended, impedance independent of OUTPUT LEVEL setting.
Level: Adjustable from 0 to 2l2Vp (4.4Vp-p) at 73kHz total deviation. 18-turn TOTAL BASEBAND OUTPUT LEVEL control.
Load: When jumpered for voltage source, will drive two 75 ohm loads in parallel. Maximum permissible load capacitance 0.047uF.
Connector: BNC, floating over chassis ground. EMI suppressed.
MONITOR OUTPUT
Configuration: Left and right, N/R decoded (or 75us deemphasized, depending on setting of internal MONITOR N/R IN/OUT switch.
Impedance: 600 ohm source impedance, single ended.
Level: Fixed; 5V peak into open circuit corresponds to 100% modulation.
Connector: Barrier strip (#5 screw), EMI suppressed.
REMOTE CONTROL
Function: Selects MONO LEFT/MONO RIGHT/STEREO Pro Channel ON/OFF.
Voltage: 6 to 24V AC or DC, momentary or continuous, optically isolated. 22VDC supplied to facilitate use with contact closure.
Connector: Barrier strip (#5 screw).
SYNC LOCK INDICATOR
Configuration: relay-controlled contact closure to indicate successful lock to sync or composite video. Limit applied voltage to 50V, total load to 10VA non-reactive, current to 0.5A.
Connector: Barrier strip (#5 screw).
POWER
115/230VAC (switch selectable), ±15%, 50-60Hz; 35VA. IEC mains connector with detachable 3-wire "U-Ground" power cord supplied. Leakage to chassis <0.5mA. AC is EMI suppressed.
Ground: Circuit ground is independent of chassis ground; both appear on terminal strip on rear panel for strapping as required.
DIMENSIONS
19" (48.3cm) W, 7" (17.8cm) H, 12.5" (31.2cm) D. 4 rack units.
WEIGHT
24lb (10.4kg) net; 34lb (15.4kg) shipping.
ENVIRONMENTAL
Operating temperature range 0-50 degrees C (32-122 degrees F). Humidity 0-95% RH, non-condensing.
CIRCUITRY
FILTERS
Filtering exceeds BTSC specifications, as stated in paragraphs 2.4.1.1 and 2.4.1.2 of the EIA Multichannel Television Sound: BTSC System Recommended Practices.
LEFT AND RIGHT LOW-PASS FILTERS
Type: Six-pole filters with two high-Q notches; group delay corrected.
Rejection: >-50dB @ 15,734Hz.
SUM AND DIFFERENCE
LOWPASS FILTERS
Type: Eleven-pole elliptical filter; group delay corrected..
Passband response: Typically +0.05, -0.1dB to 15,000Hz.
Stopband rejection: >60dB @ 15,734Hz and above.
STEREO BASEBAND ENCODER
Equivalent stereo separation: >55dB, 50-15,000Hz.
Crosstalk-linear: <-70dB, 50-15,000Hz, main channel to subchannel, or subchannel to main channel, referenced to ±55kHz deviation.
Crosstalk-non-linear: <-80dB, main channel to subchannel, or subchannel to main channel, referenced to ±55kHz deviation. Suppression of other spurious components: <-75dB, referenced to ±55kHz deviation.
Specifications subject to change without notice.