Model 22 Access Station

Product Information
Specifications
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The Model 22 consists of a metal chassis containing two lighted pushbutton switches, microphone and line inputs, and supporting audio, status, and control circuitry. An external interrupt audio source is required. This can be in the form of a microphone or line-level signal. A microphone input is provided for connection to an electret gooseneck microphone. The Model 11B Gooseneck Microphone, an option available from Studio Technologies, is directly compatible. The transformer-coupled line input allows various pieces of communications equipment to serve as the interrupt audio source. This can be used to interface with intercom systems from companies such as RTS® and Clear-Com®, typically utilizing their "hot mic out" signals. A configuration switch allows Model 22 interrupt activity to mute the monitor amplifier output on the associated Model 2A Central Controller.

The optional Model 25A 19-Inch Rack Adapter allows the Model 22 to be mounted in one space of a standard 19-inch rack enclosure. Alternately, the Model 22, along with an optional Model 28A Panel Adapter, can be flush mounted in an opening provided in a custom-fabricated enclosure or cabinet surface. The Model 22 interfaces with the Model 2A Central Controller using a 9-conductor interface cable. Power for the Model 22 is provided by the connected Model 2A Central Controller.

Application: provides remote 2-channel interrupt (talk) location based on a Model 2A Central Controller unit; up to four Model 22 units can be connected to a Model 2A Central Controller

Power Requirements: 18 Vdc, 25 mA maximum, provided by connected Model 2A Central Controller

Interconnection:
Two DE-9F (9-pin D-subminiature female) connectors. One connector intended to link Model 22 to Model 2A Central Controller. The second connector, wired in parallel with the first, is designed to allow "loop through" installation for connection to additional Model 22(s).

Pushbutton Switches: 2
Type: backlit, momentary, EAO 99-series Lamp Type: incandescent, T-1, bi-pin, 18 V, 26 mA, 0.5 watt equivalent to EAO Switch Corp. 11-903-2, Wamco 0L1100BPE, Lamptronics AS25-8

Microphone Input:
Compatibility: 2-wire electret, designed for use with Studio Technologies' Model 11B Gooseneck Microphone Kit (purchased separately)
Intended Input Level: –25 dBu nominal
Microphone Power: +5 Vdc, current limited; applied to microphone "high" lead
Connector: three terminals on a screw terminal strip

Line Input:
Type: electronically balanced, capacitor coupled, compatible with balanced or unbalanced audio signals
Input Impedance: 24 k ohms
Common Mode Rejection: 100 dB at DC and 60 Hz, 70 dB at 20 kHz, 62 dB at 40 kHz (typical)
Input Level: –15 to +10 dBu, input level adjustable via trim potentiometer
Connector: two terminals on a screw terminal strip

Dimensions (Overall):
6.4 inches wide (16.3 cm)
1.6 inches high (4.1 cm)
5.2 inches deep (13.2 cm)

Mounting: rack mounted using Model 25A 19-Inch Rack Adapter (purchased separately), panel mounted using Model 28A Panel Adapter (purchased separately); custom mounting easily accomplished

Weight: 0.8 pounds (0.35 kg)

Model 25A 19-Inch Rack Adapter

Application: intended for use with Model 22 Access Station and Model 11B Gooseneck Microphone Kit

Dimensions (with Model 22 attached):
19.0 inches wide (48.3 cm)
1.72 inches high (4.4 cm)
5.2 inches deep (13.2 cm)

Mounting: one space (1U) in a standard 19-inch rack

Weight (with Model 22 attached): 1.6 pounds (0.7 kg)

Model 28A Panel Adapter

Application: intended for use with one Model 22 Access Station and one Model 11B Gooseneck Microphone Kit

Dimensions (with Model 22 attached):
8.0 inches wide (20.3 cm)
2.75 inches high (7.0 cm)
5.2 inches deep (13.2 cm)

Mounting: designed to be mounted in a panel opening; recommended opening size 6.5 inches wide (16.5 cm), 1.7 inches high (4.3 cm), 6.5 inches minimum depth (16.5 cm)

Weight (with Model 22 attached): 1.3 pounds (0.6 kg)

Specifications and information subject to change without notice.