Corridor Plus - Intercom Interface for Blackmagic Designs© to Clearcom© and RTS© with 4-wire Interface

  • $695.00
  • Save $300


Intercom Interface for Blackmagic Designs© to Clearcom© and RTS©

Corridor has two channels of intercom interface.

Channel A is a standard 2 wire to 4 wire intercom interface.

Channel B is a 2 wire Clearcom© and RTS© compatible to Blackmagic Designs Studio Converter­­™ and Talkback Converter™.


Front Panel Controls
Sidetone adjustment:

Improper sidetone could cause feedback between input and output. 

Sidetone Adjustment Procedure:

  1. Set Link (5) switch to OFF.
  2. Turn the Input Level Reduction Switch (8) to 0dB.
  3. Press Test Tone (7) button, a constant beep sound can be heard from the Sidetone (6) Monitor.
  4. Adjust Output Level (9) control knob to make the beep level heard properly.
  5. Turn the Main Sidetone Adjustment M (1) knob by clockwise and anti-clockwise direction slowly.
  6. Find minimum listening level.
  7. Turn the Auxiliary Sidetone Adjustment A (1) Find the minimum listening level.

Repeat this procedure 1) to 7) for the other channel.

Output Level Output Level Reduction Switch (8)

This switch has 0dB, -20dB and -40dB three levels. It reduces the signal level which is sent to the pins 3 and 4 of the 4-wire connector (13)  on the rear panel of Channel A or the BNC OUT of Channel B.

Output Level Adjustment (9)

This output level adjustment provides a strong average green light on the Output Level Indicator (10). This occurrence indicates a 0dB line level on 600ohm line. Red light indicates exceeded output level. Occasional transitions to a red light are acceptable.

Output Level Indicator (10)

Green light indicates the output level is normal.

Red light indicates the output level is high.

Input Level Input Level Reduction Switch (2)

This switch has 0dB and -20dB two levels to match the signal level which is sent from pins 1 and 2 of the 4-wire connector (13) at the rear panel of Channel A or the BNC IN of the rear panel of Channel B.

Input Level Adjustment (6)

Adjust the Input channel gain to fit different input signal level. This knob provides a strong average green light on the Input Level Indicator (4). Meanwhile the level on pin 3 of the 2-wire connector is 0dB. Red light indicates exceeded input level. Occasional transitions to a red light are acceptable.

Input Level Indicator (4)

Green light indicates the input level is normal.

Red light indicates the input level is high.

Link (5)

Channel A and Channel B are separate from each other when this switch is set to the Off position.  When this switch is set to ON position, Channel A and Channel B are connected.

 

 

Rear Panel

4-wire In/Out Connector (8)

                   Input:     Pin1 --- Audio+

Pin2 --- Audio- (Common)

                   Output:   Pin3 --- Audio- (Common)

Pin4 --- Audio+

External signal to the Corridor can be balanced or unbalanced. Unbalanced signal is more susceptable to noise.  Balanced signals have better noice canceling.

Intercom Line Connector (9)

3-pin XLR female

Pin 1 --- Common (Shield)

Pin 2 --- Power (15~30 VDC)

Pin 3 --- Audio

III. Installation

The Corridor comes in a standard 19 inch 1U case which can be mounted in a rack or placed on a desktop.  It can be powered by either the A or B channel from the intercom base station using standard mic cable.

Two XLR-3 connectors for channel A and B are used to connect 2-wire equipment. Pin connector is used to connect 4-wire input and output equipment.  BNC connectors are available for AES/EBU equipment like Blackmagic Designs Talkback Converters.

IV Troubleshooting

Problem: Acoustical feedback

Cause 1: Input or output signal level is too high

Solution 1: Adjust the signal level

Cause 2: Side tone of this station or any remote station is not adjusted correctly

Solution 2: Adjust side tone refer to the procedure in the Front Panel section of this manual.

Cause 3: No termination in the system.

Solution 3: Check the termination in the system.

Cause 4: 4-wire equipment connector are not connected well Solution 4: Check the connection.

Problem: Output level is set to max, the audio level from camera end is still too low

Cause: Output level raw adjustment is not proper

Solution: Set output level to ‘Line’, then adjust output level to proper level

Problem: The audio level heard from camera end is too low

Cause: Input level is too low

Solution: Adjust input level by clockwise to proper level

Problem: Hum or buzz in system

Cause 1: Inductive pickup caused by close proximity of this main station or connected remote stations to power lines or transformers.

Solution 1: Relocate the offending unit.

Cause 2: Intercom line cable is not wired properly; the shield of microphone cable is not connected to Pin-1 of the 3 pin XLR

Solution 2: Check intercom line cable. Make sure all the cables’ Pin-1 of 3 pin XLR connect correctly.

V Technical Specification

Bandwidth: 300Hz – 4000Hz ±3dB

Input:

Balanced, unbalanced self-adaption

Resistance: >10K ohm Bridge Level:   -37dBu-+12dBu (1KHz)

Output:

Balanced, unbalanced self-adaption

Resistance: 600 ohm

Level: -43dBu - +8dBu (1KHz)

Environmental

0°-70°C(32°-158°)

Dimensions

19” (W) x 1.77” (H) x 6.69” (D), 483mm x 45mm x 170mm

Weight

1.9kg

Note: 0dBu=0.775V RMS