Fire Com 110, Installation & Operation Manual

9

SETTINGS

RX

The receive audio adjustment is a rotational adjustment of the audio gain from the radio. When making this
adjustment, set your mobile radio volume to the normal volume level used without the 110 interface installed.
The audio level should be adjusted with the headset user for quality audio mixing.

Transmit Audio Gain Jump

The transmit audio gain jump switch is an incremental gain increase of the audio broadcast through the radio.
The gain is increased when the switch is in the “up” position and decreased in the “down” position. The transmit
audio “TX” should be used initially for adjustment and the transmit audio gain jump used only if required.  

Headset Audio Gain Jump

The headset audio gain jump switch is an incremental gain increase of the headset sound level. The headset 
is also equipped with an independent volume control. If an overall higher headset sound level is desired, the 
headset audio gain jump switch may be used. The gain is increased when the switch is in the “up” position 
and decreased in the “down” position.

TX

The transmit audio adjustment is a rotational adjustment of the audio broadcast through the radio. Adjust the
radio transmit sound level to eliminate clipping and provide quality audio mixing.

After these adjustments are made, the holes may be sealed using plugs (provided).

OPERATION

The 110 radio interface is designed to offer clear communications to a mobile radio using a noise-canceling
headset.

Before testing the unit, make sure the power supplied to the unit and the radio is turned on. To begin using the
radio interface, plug your Firecom headset into the headset module. For proper headset fitting instructions, as
well as care and maintenance, see your headset manual.

Firecom offers both over-the-head and under-the-helmet styles of headsets for use with the 110 radio interface.
These radio transmit headsets are identified by a red momentary PTT button on the headset. To transmit out the
radio, press and hold the red PTT button. You will hear your voice in the headset only when you transmit. You
will always hear radio traffic on your headset. Volume is adjusted on the ear dome.

Foot Switch (optional)

If an optional foot switch is installed, the headset plugged into the headset module will transmit over the radio
when the foot switch is activated. See 

System Wiring

section, “

Foot Switch (optional)

” in this manual.