Telex BTR-300 operating instructions Controls and Connections, Plug for Telex Units

FEATURES

￿Lightweight, small size and is self-contained.

￿2 separate antennas, one for transmit, the other for receive.

￿Push-to-Talk with Lock-to-Talk feature switch for the TR-300 and Push-to-Transmit with Lock-to-Transmit feature for the TR-300P.

CONTROLS AND CONNECTIONS

EXTERNAL CONTROLS (Refer to Figure 6)

Volume OFF/ON Control: This thumbwheel control serves as both an off/on switch and as a volume control.

Low Battery and Overmodulation Indicator Light:

Low Battery Indicator: Part of the battery check circuit. When the power switch is placed in the “ON” position the light will flash one or more times if the battery is good. A poor battery will cause the light to illuminate continuously and a bad or unus- able battery will not cause any illumination at all.

Overmodulation Indicator: Uses the same light as the low battery indicator. During the talk mode, if the microphone gain is too high, the light will illuminate when talking.

Push-To-Talk, Lock-To-Talk Switch:

This switch enables the talk function.

Talk Indicator Light: (Labeled “talk”) will be illuminated whenever the talk function on the TR-300 is enabled.

Headset Connector: A four pin XLR connec- tor for Input/Output. (Plug for Telex, Jack for RTS units). The headset jack will accept many different Telex model headsets. Compatible with other intercom headsets with four pin XLR connectors that are wired as shown in Figure 5.

MICROPHONE

GROUND (1)

BALANCED AUDIO OUT (3 and 4)

MICROPHONE AUDIO (2)

Plug for Telex Units

MICROPHONE

GROUND (1)

BALANCED AUDIO OUTPUT

(3 and 4)

MICROPHONE

AUDIO (2)

Jack for RTS Units

Figure 5

Headset XLR Connector Wiring

Charge Jack: Allows nickel-metal hydride batteries to be charged without removing them from the unit.

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