User's Manual

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2.4.4 Headset with level-limited ambient sound reception
Fig. 4 Headset with level-limited ambient
sound reception
General – Headsets with level-limited ambient sound
reception (Fig. 4) are used mainly where ambient
sounds, warning signals etc. have to be heard
alongside communication. The external sounds are
received by a microphone (Fig. 4/b) on the front side of
the left-hand headset muff and are audible inside this
headset muff via the ambient sound speaker.
If the external sounds exceed 85 dB(A), the sound
level emitted to the ear by the ambient sound speaker
is limited electronically to a maximum of 85 dB(A).
The power for the ambient sound reception electronics
is supplied by the Transmitter/Receiver Unit CT-
GateCom II.24/Multi.
Switching On/Off and adjusting the volume for
ambient sound reception – The ambient sound
reception is switched on and off and volume controlled
by means of the additional combined On/Off switch
and volume adjuster (Fig. 4/a) on the headset muff.
2.4.5 Audio signals used
Two different audible tones are used for signaling the operating status via the headset connected to the
Transmitter/Receiver Unit. The tone for the indication of positive responses (P-tone) has a higher
frequency than the tone for the indication of negative responses (N-tone). Signaling of the various
events is effected by a varying number of consecutive P-tones or N-tones.
Positive acknowledgement tone
All positive responses are indicated by a high P-tone.
Negative acknowledgement tone and error tone
All negative responses and error status are indicated by a low N-tone.
Examples battery warning
If the battery has an undervoltage a low 3-beep N-tone sequence »N-N-N« sounds approximately every
10 seconds in the Headset.
Examples range warning
If the range limit is reached, a high 3-beep P-tone sequence »P-P-P« sounds approx. every 5 seconds
in the Headset.
2.4.6 On/Off switch for the microphone
The microphone of the headset can be switched on and off with the microphone switch »PTT.–OFF–
HOT.« at the bottom of the headset muff(s). Three switch positions are possible. However,
communication can only be performed after on-air subscription (sections 3...3.4) that is carried out ex-
works, switching on, synchronization, adjustment of the speaker volume (sections 4...4.3) and
connection setup (sections 4.4...4.4.2) have all been effected.
Middle position »OFF« (receive): The headset microphone is switched off. You can only receive.
Front switch position »PTT« (transmit and receive): »PTT« position (PTT = push-to-talk).
The headset microphone is switched on. You can speak into the microphone as long as you hold the
switch in this position and simultaneously a message is being received. After releasing the switch, the
switch returns to the middle position »OFF«.
Rear »fixed« switch position »HOT« (transmit and receive): »Hot mic« position.
The headset microphone is constantly switched on. You can speak into the microphone and
simultaneously receive a message.