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The Model 46 is designed to interface 2-wire full-duplex party-line intercom circuits with 4-wire audio circuits associated with matrix intercom systems. Other specialized audio system interfacing applications can also be supported.
The Model 46 provides two independent full-featured 2-channel interfaces. Each interface contains two hybrid circuits which include automatic nulling capability. The analog circuitry, under software control, provides excellent audio quality and high return-loss. The interfaces are compatible with powered and unpowered 2-wire party-line circuits. They are capable of supplying DC power, allowing direct operation of devices such as user belt packs. Configuration settings allow the 2-wire and 4-wire interface circuitry to be compatible with a range of nominal signal levels. Audio level meters provide user confirmation of system performance during setup and operation. Applications for the Model 46 include television sports and special event broadcasting, theme park and theater installations, corporate events, and industrial testing environments. Standard audio connectors are used for all input and output signals. The Model 46 mounts in one space of a standard 19-inch rack enclosure and requires 100-240 volts, 50/60 Hz for operation.
- General Audio:
- Frequency Response: ±2 dB 100 Hz to 8 kHz
- Distortion (THD+N): <0.5%, measured at 1 kHz, 4-wire input to 2-wire interface pin 2
- Signal-to-Noise Ratio: >55 dB, measured at 1 kHz, 4-wire input to 2-wire interface pin 2
Connectors:
- Inputs from 4-Wire: 3-pin female XLR-type
- Outputs to 4-Wire: 3-pin male XLR-type
- 2-Wire Party-Line Intercom: 3-pin male XLR-type
- Remote Control: 10-pin header, requires optional 10-pin ribbon connector assembly
- AC Mains: 3-blade, IEC 320 C14-type (mates with IEC 320 C13)
2-Wire Party-Line Intercom Interfaces: 2
- Type: 2-channel party-line (PL), unbalanced (pin 1 common; pin 2 DC with channel 1 audio; pin 3 channel 2 audio)
- Compatibility: single- and dual-channel intercom systems such as from Telex®/RTS® and Clear-Com®
- Impedance, External Power Mode: >10 k ohms
- Impedance, Internal Power Mode: 200 ohms
- Nominal Level: –10 or –14 dBu, selectable
- “Mic Kill” Signal: square wave, 24 kHz, ±1%
- Internal Power Source: 30 volts DC nominal, 300 milliamperes maximum
Hybrids: 4, 2 per interface
- Topology: 3-section analog circuitry compensates for resistive, inductive, and capacitive 2-wire party-line loads
- Nulling Method: automatic upon user initiation, processor implements digital control of analog circuitry; null settings stored in non-volatile memory
- Nulling Line Impedance Range: 120-350 ohms
- Nulling Cable Length Range: 0-3500 feet, typical
- Trans-Hybrid Loss: >40 dB, typical at 800 Hz
4-Wire Inputs: 4, 2 per interface
- Type: transformer-coupled, capacitor isolated
- Impedance: 13 k ohms
- Nominal Level: 0, +4, +6, or +8 dBu, selectable in tandem with nominal output level
- Maximum Level: +22 dBu
4-Wire Outputs: 4, 2 per interface
- Type: transformer-coupled, capacitor isolated
- Impedance: 50 ohms nominal
- Nominal Level: 0, +4, +6, or +8 dBu, selectable in tandem with nominal input level
- Maximum Level: +20 dBu into 2 k ohms
Meters: 8
- Function: displays level of 4-wire inputs and outputs
- Type: 5-segment LED, modified VU ballistics
Remote Control Inputs: 3
- Type: optically coupled
- Input: 3-32 volts DC; 2 milliamperes minimum for operation, 20 milliamperes maximum
- Functions: auto null interface 1, auto null interface 2, and “mic kill”
AC Mains Requirement: 100-240 volts (–15/+10%), 50/60 Hz, 0.7 A maximum @ 100 volts, 0.4 amperes maximum @ 240 volts Dimensions (Overall):
- 19.0 inches wide (48.3 cm)
- 1.72 inches high (8.9 cm)
- 8.5 inches deep (21.6 cm)
Mounting: one space in a standard 19-inch rack Weight: 7.75 pounds (3.5 kg)
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