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INTRODUCTION

The hybrid channel handles two phone lines:
  • A landline (2-wire, also known as ).
  • A cellular phone via Bluetooth.
Channel operation is simple and error-proof thanks to its safety logic and automatic control circuits. 612 Hybrid Upscaled Jpe

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USING WITH LANDLINE

When a call comes in, a blue LED flashes with the ring cadence. You can answer:
  • From the associated telephone (recommended).
  • From the console’s hybrid.

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Answering from the associated telephone

  1. Pick up the handset connected to the D612’s rear RJ11.
  2. To put the call on air: press HOLD/AIR and hang up the phone.

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Answering from the console

  1. Verify that the AIR LEVEL knob is closed before taking the line.
  2. Press HOLD/AIR.
  3. The line is taken and the pilot light turns off.
  4. The caller receives PGM return and can go on air when AIR LEVEL is opened.

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Private communication

  1. Press CUE: PGM to the line is interrupted and the caller is heard through the CUE speaker.
  2. To talk: hold down TALKBACK, using the console’s talkback microphone.

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Putting the call on air

  1. Release CUE.
  2. Turn AIR LEVEL and adjust to the appropriate level.
    Adjustment is done by observing the PGM VU meter and listening to the on-air audio, because the bass-filtered audio of a telephone communication can match the loudness of studio voices even when showing lower levels on the VU meters.In an analog hybrid, it’s important not to exceed the on-air line level to avoid contaminating studio voices.

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Return to private mode

  • Close AIR LEVEL and use CUE (listen) and TALKBACK (talk).

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Return to associated telephone

  1. Lower AIR LEVEL to zero.
  2. Pick up the handset.
  3. Release HOLD/AIR on the console.
If the phone is hung up when releasing HOLD/AIR, the call will end.

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End the communication

To end the communication, close AIR LEVEL and release HOLD/AIR.

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USING WITH MOBILE PHONE

The mobile phone must be paired with the D612 console via Bluetooth.

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Daily connection

  1. Verify that AIR LEVEL is closed and CUE is pressed.
  2. Activate Bluetooth on the console: hold down CELLULAR PHONE BLUETOOTH for about 5s until the green LED (located on the VU meter panel) flashes slowly.
  3. Activate Bluetooth on the mobile phone.
    • If previously paired, the connection is automatically restored.
    • Incoming calls are transferred directly to the console.
If the console is used only with mobile phone, it’s convenient to keep it always linked and handle calls from the hybrid. For cases where there is continuous use of both lines, either alternately or simultaneously (conferences), some operational particularities arise that are detailed in Conferences.

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Incoming call (mobile)

  • When a call comes in, it rings on the mobile phone and CUE speaker (if CUE is pressed).
  • Verify that AIR LEVEL is closed.
  • Answer with a short press on CELLULAR PHONE BLUETOOTH (or from the mobile screen).

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Call handling

  • With CUE pressed, the call is heard on CUE speaker (without PGM return).
  • To talk: hold TALKBACK.
  • When releasing CUE, the caller hears PGM, but won’t go on air until AIR LEVEL is opened.
  • To put on air: open AIR LEVEL and adjust level on VU meters.

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Return to mobile

  • On the mobile phone, exit Headset/Bluetooth mode and switch to Speaker.
  • To transfer back to console: return to Headset.
Depending on the model, the menu may show “Headset” icons, dropdown buttons or different combinations. Check the phone’s manual.

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End the communication

  • Short press CELLULAR PHONE BLUETOOTH, or end from the mobile phone.

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Calling from mobile

  1. On the mobile phone, switch to Headset mode to disconnect from console.
  2. Dial the number and press SEND.
  3. To transfer the call to console: return to Bluetooth/Headset mode.
  4. On the console: release CUE to send PGM return to mobile.
  5. Open AIR LEVEL to put on air.
You can also call without exiting Bluetooth mode, using Talkback:
  • Tone and voice are heard in CUE.
  • Talk with Talkback.
  • For hold: keep CUE active.
  • For air: open AIR LEVEL.
  • To end: short press CELLULAR PHONE BLUETOOTH or end from mobile.

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CONFERENCES

When using landline and mobile simultaneously:
  • On mobile: Disconnect Bluetooth from console after each call. This way, if a call comes in, it rings on the phone.
  • If mobile Bluetooth remains connected to console, an incoming call could ring on air while landline is open.
The procedure to establish a conference depends on which line is on air:
  • Receive or make call through telephone associated with landline.
  • Talk and warn they’ll go directly on air.
  • Press HOLD/AIR to send to air and hang up phone.
  • If phone allows, you can mute microphone before hanging up to avoid noise.
  • Call enters conference with mobile already on air.
If call holding is required, install an external hybrid. The EXT HIB connector allows adding it to the Internal Hybrid without using an extra console channel.

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PGM send to phone line

The hybrid built into D612 has no line return level control.
  • Send is automatic, with AGC and limiter.
  • Send signal is limited to 400-2200 Hz band, optimized for intelligibility.
  • This prevents distortion caused by excess return.
  • To ensure quality: maintain VU meter at 0 VU with occasional peaks above zero.
To verify: measure with oscilloscope in parallel to line → signal should be 2V peak to peak.