TKIE - Using the loudspeaker as microphone

This article describes how the loudspeaker connected to a TKIE-2 kit also can be used as a microphone.

Wiring diagram

Wiring diagram - The two relays are used to switch between mic input and amplifier output

Minimum loudspeaker impedance is 8 ohms.

Use a 100pF capacitor in series with the plus-wire to remove the microphone bias

Configuration

The relays of the TKIE switches the loudspeaker. In idle the loudspeaker is connected to the mic input. When the relays are activated the loudspeaker is connected to the amplifier output.

ICX/AlphaCom system

To operate the relays, an event must be created with the TKIE-2 kit as the Event Owner:

The Audio event is used to switch the relays

In the example above the relays are controlled by the SET_IPRCO command. One can alternatively use the RCO command.

When the "Sub-event" = 62, this event will operate the relays when:

• M-key is pressed during a direct call
• Group call is received
• Audio Program is playing
• Alarm Message is received

Edge system

• To operate the relays of the TKIE when using the M-key during a direct call, configure Remote Digit For Relay On and Remote Digit For Relay Off as shown in the screen shot below.
• If the loudspeaker should distribute group calls, configure Group Call (Edge mode only) and Idle according to the screen shot below.

The below configuration must be done for both Relay 1 and Relay 2

Relay configuration in Edge mode