Manual

CM-CU1 Commentator Unit User Handbook

REAR PANEL CONTROLS & CONNECTIONS

4 Rear Panel Controls & Connections

Fig 3-2: Rear Panel View Of CM-CU1

The rear panel of the Commentator Unit carries the five return audio inputs and

commentator, talkback and mix output connectors. Four additional controls are located on

the rear panel; On Air Lock, Talkback Gang, Limiter and Test Tone.

On Air Lock Controls

The On Air Lock prevents the commentator’s ON AIR button from being deactivated

accidentally. When the On Air Lock is enabled, the on air channel can only be deactivated

by first pressing the pushbutton located next to the On Air Lock switch. A slot in the rear

panel makes locating the On Air Lock pushbutton easy; simply position your finger in the

slot in the rear panel, indicated by the “ON AIR LOCK” text on the top panel, then slide your

finger down the slot until you reach the pushbutton.

Talkback Controls

The TALKBACK GANG switch links the operation of each of the commentator’s TALKBACK

A, B, C and D buttons. When this switch is on, pressing one of the TALKBACK buttons

automatically activates the other TALKBACK buttons. Up to an additional 12dB of gain

is available on all talkback outputs, if required. This is applied prior to the limiter and is

adjusted using the rear panel GAIN potentiometer.

Limiter Controls

The LIMITER ON/OFF switch and LEVEL potentiometer control the limiter that is applied to

the Mix Output. The potentiometer sets the threshold level at which the limiter becomes

active, and has a range of between -13dB to the maximum output level of +25dB.

Test Tone Switch

The CM-CU1 has a built in test tone generator which selectively routes a line-up tone to

all outputs to assist channel identification and cabling checks. There are two test tone

modes; manual and auto. Regardless of mode, a 1kHz tone is permanently routed to the

Mix Output and the PPM meter will indicate that the signal level is 0dBu. The test tone is

enabled by sliding the TEST TONE switch to the upper “ON” position. To change the test

tone mode; keep the Talkback B and Talkback C buttons pressed for 2.5 seconds.