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McCurdy Radio Ltd

RS2620 & RS2621

PROGRAM CIRCUIT SELECTOR & REMOTE CONTROL PANEL


RS2620 RS2620

The RS2620 Program CircuitSelector provides operating simplicity, increased economy and complete versatility in the use of multiple remote pickup lines. With it, the studio has complete control over switching events, including lines to be switched, the time of switching and mode of operation. It is not necessary to involve telephone company personnel in these operations, allowing accurate, rapid switching and back-to-back remotes from several different locations. Each RS2620 is equipped with two program channels, allowing operation in stereo, mono or dual mono modes. The mode of operation is assigned during set-up to the particular remote lines and may be intermixed; some lines may be configured for stereo and some mono. The assigned mode is automatically invoked when the line is selected.

Two extra switched lines are provided in addition to the main program lines, a Telephone Coordinate Channel (TCC) for control purposes and a cue line to allow a signal feed from the studio to the remote location. The lines from the remote pickups terminate at the RS2620 in the telephone central office, allowing interconnection to the studio with a minimum number of lines.

Five telephone company lines are required between the studio and central office for full stereo operation, two program, one TCC, one cue and one dial line for the remote control panel. When operating in mono, of if cue is not required, the number of lines required decreases to three. Program lines are selected via the keypad on the front panel of the circuit selector, the remote control unit or via any standard Touch-Tone telephone. A timed, programmable, security code is incorporated on the telephone line to prevent unauthorized access.

The selected line, along with the next line to be selected, is displayed on a large character, high-contrast, back-lit, liquid crystal display on the front panel of the circuit selector and remote control unit. Each is equipped with a variable contrast control, providing optimum viewing quality under extremes of ambient light. Names of up to 8 characters in length may be assigned to each of the program lines from the keypads and will be displayed along with the line number. Codes indicating that the line has been equalized and mono or stereo operating modes are also incorporated into this display. Up to two remote control units may be used with each circuit selector and the displays on all connected units will display the same information, regardless of what source was used to enter that information. A true tally-back circuit is used to prevent false indications of selected lines.

The program circuit selector utilizes four equalizer circuits, a main and a set-up for each of the two channels. The line level, high frequency and phase equalization are adjusted on the set-up equalizers by the internal microcontroller via an external DOS computer connected to the front panel RS232 serial data port. These adjustments may also be done with a remote computer via a modem link to the serial data port. The settings for each line are then stored in the battery-backed internal memory and are automatically loaded into the main equalizers when that line is selected. This allows two equalizers to do the work which previously required twenty, reduces the quantity of controls, simplifies set-up and improves security.

The computer software used for set-up is user-friendly with on-screen prompts and level indications, enabling technicians unfamiliar with the unit to easily and quickly perform set-up adjustments. It also allows the setup data to be stored in the computer or on floppy disks as a backup. Internal interlocks allow the set-up of any non-selected line while preventing any interruption of the line currently active. Each set-up equalizer is equipped with front panel bantam test jacks, for line input, equipment input and output. Each main equalizer output is provided with a bantam monitor jack, an output level control and an LED to indicate the presence of an audio signal. The unit also incorporates an internal 1kHz oscillator as an aid in system test and alignment.

The RS2620 Program Circuit Selector is available in two versions, the standard unit with inputs for either 10 monaural lines or 5 stereo pairs, and the expanded version equipped with the RS2620-6 module providing inputs for 20 mono lines or 10 stereo pairs. The expansion module plugs into a slot provided on the rear panel, allowing the standard unit to be easily field-upgraded at any time.

Both units are enclosed in rugged, compact, all-steel chassis which flush mount in a standard 19 inch equipment rack, with the Program Circuit Selector occupying 5¼ inches of panel space and the Remote Control Panel occupying 3½ inches. Adaptor brackets are available to allow recess mounting and flush or recess mounting in a 23 inch rack. The RS2620 is powered directly from the -48 Volt central office battery and the RS2621 from the standard AC line, via an external plug-in supply included with the unit, or from an external 24 Volt DC source.

PROGRAM CIRCUIT SELECTOR SYSTEM FEATURES

  • Increases efficiency and economy in the use of multiple remotes

  • Puts the STUDIO in control of remote line switching

  • Remote switching of up to 10 stereo or 20 mono program lines

  • One Telephone Coordinate Channel & one Cue line switched with each program line or stereo pair

  • Switching done from unit and/or up to 2 control panels in the studio or elsewhere

  • Switching also can be done from any Touch-Tone telephone at any location

  • Selected and next line clearly shown on large, back-lit LCD display

  • All displays updated simultaneously to show same information

  • Display shows line number and up to an eight character assignable name

  • Codes indicating mono or stereo mode and line equalization on display

  • True tally-back for indication of selected line

  • Separate set-up and main equalizers for each channel

  • Mode and set-up equalizers adjusted with computer via front panel RS232 serial port

  • Set-up information stored in memory and recalled along with line to set main equalizers

  • Set-up may be done remotely via a computer and a modem

  • Battery back-up of internal memory protects against memory loss due to power failure

  • Internal 1kHz test oscillator & a full complement of controls and test jacks on front panel

  • Compact size, only 3 rack units (5¼in.) of space required in standard 19 inch rack

    SPECIFICATIONS

    Inputs:

  • Program Lines: 5 Stereo or 10 Mono, (Optional) 10 Stereo or 20 Mono

  • Telephone Coordinate Channel: 10, 20 Optional

  • Cue: 1

  • Remote Selector: 2

  • Telephone Line: 1

  • Setup Control: 1, RS232 Standard, 9 Pin

    Outputs:

  • Program: 1 Stereophonic or Monaural

  • Telephone Coordinate Channel: 1

  • Cue: 10, 20 Optional

    Frequency Response, Program: ±0.5dB, 50Hz to 15kHz at +18dBm Output

    Frequency Response, Cue: ±0.5dB, 100Hz to 8kHz at +8dBm

    Harmonic Distortion, Program: 0.5% Max., 50Hz to 15kHz at +18dBm Output

    Noise: -70dBm, Maximum, No Equalization

    Crosstalk (Any 2 program Lines): -60dBm, Maximum

    Stereo Channel Separation: 90dB, Minimum

    Gain: 0 to 29.9dB, adjustable in 0.1dB steps

    Input Impedance: 150 or 600 ohms Balanced

    Input Level: +18dBm, Maximum

    Longitudinal Balance: 70dB Minimum at 1kHz

    Input Return Loss: 35dB Minimum

    Output Level: Adjustable to +18dBm Maximum

    Output Impedance: 150 or 600 ohms Balanced

    Maximum Level, TCC or Cue: +8dBm Nominal, +18dBm Peak

    High Frequency Equalization: 0 to +29.9dB, in 0.1dB steps at 8 or 15kHz

    Phase Equalization: 160° at 15kHz, Maximum

    Equalizer Adjustment: DOS Computer via RS232 Control Port

    Equalizers: 2 Main and 2 Set-Up

    Test Oscillator: 1kHz at +8dBm, 1% THD, Maximum

    Level Indication: Digital, On Computer Screen, -40dBm to +20dBm

    Line Selection: From front panel keypad, keypad on RS2621 remote control panel or from Touch-Tone® telephone via Standard Telephone line

    Line Selection Indication: Front Panel Display on RS2620 & RS2621, Alpha- numeric, line number or name, 20 characters, maximum

    Tally-Back Indication: Front Panel Display on RS2620 & RS2621, Alpha- Numeric, line number or name, 20 characters, maximum.

    True tally to all control panels simultaneously.

    Bantam Test Jacks:

  • 2 Active Line Output Monitor, 600O Balanced

  • 6, Line, Equipment & Output, both line-up Equalizers

    Power Requirements, RS2620: -43.2 to -52.8 Volts DC at 2½ Amperes, Maximum

    200mV Peak-to-Peak ripple

    Power Requirements, RS2621: 105 to 125 Volts, 60Hz or -24Volts DC at 250mA

    Operating Temperature Range: 0 to 55° C, 32 to 131° F

    Overall Dimensions, RS2620: 5¼in.(133mm) x 19in.(483mm) x 11½in.(292mm)

    Overall Dimensions, RS2621: 3½in.(78mm) x 19in.(483mm) x 2½in.(64mm)

    ORDERING INFORMATION

    Program Circuit Selector (5 Stereo or 10 Mono): RS2620

    Expansion Module (doubles lines to 10 Stereo or 20 Mono): RS2620-6

    Remote Control Panel: RS2621

    Setup Software for DOS Computers: RS2620-7





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