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18.
FIGURE 19:
FH Style Headset
ADJUSTMENT SLIDE
I N T E R C O M O P E R A T I O N
HEADSETS
Firecom offers many different styles of headsets for use with the 3000C Intercom System.
Headsets are available in an Over-The-Head (Figure 19), or Under-The-Helmet (Figure 20) style. Either of these styles can be Radio-Transmit capable, or Intercom-Only.
For more information regarding the different models of headsets available, contact your local Firecom Dealer.
PTT
ADJUSTMENT SLIDE
VOLUME
CONTROL
RADIO-TRANSMIT HEADSETS
The Radio-Transmit Headsets receive both intercom and radio communications at all times.
The mic is always active for intercom communications. Radio-Transmit Headsets are typically used at the Driver, Officer and Pump Panel positions.
There are 2 models of Radio Transmit Headsets available for use with the 3000C Intercom
System: the UH-10 and the FH-10. There is a RED Push-To-Talk (PTT) button located on the ear dome which allows communication on the radio
INTERCOM-ONLY HEADSETS
The Intercom-Only Headsets receive both intercom and radio communications at all times, but are NOT radio-transmit capable. Intercom-Only are typically used at the jumpseat positions, due to the high ambient noise level at these locations (engine noise, etc.).
There are 4 models of Intercom-Only Headsets: the UH-20, the FH-20, the UH-40 and the FH-40.
• The UH-20 and the FH-20 have a BLACK Push-To-Talk (PTT) button on the ear dome. Press and hold this black PTT to speak on the intercom.
• The UH-40 and the FH-40 have a YELLOW Push-To-Talk (PTT) on the ear dome.
Press and release the yellow PTT to turn the microphone on. Press and release the yellow PTT again to turn the microphone off.
HEADSET ADJUSTMENT
The vertical fit of the headset is adjusted by the adjustable headband (FH models) or the adjustable headstrap (UH models).
• Over-The-Head (FH) style headsets (Figure 19): These headsets have adjustable headbands with slide mechanisms located at each side above the ear domes. If the adjustment slides become loose, gently tighten the self-locking nuts on the slide mechanisms.
• Under-The-Helmet (UH) style headsets (Figure 20): These headsets have an adjustable headstrap for adjusting the height of the ear domes.
For maximum comfort, wear the headset as far back on the head as possible, while ensuring that the ear domes still completely cover the ears. If discomfort is felt in the jawbone, you are wearing the headset too far forward.
I N T E R C O M O P E R A T I O N
MICROPHONE PLACEMENT
The microphones used on Firecom headsets are noise-canceling electret microphones. The placement of the microphone is VERY important. For proper operation, the microphone should be positioned in front of the mouth and no more than 1/8” away from the lips
(Figure 21).
Placement of the microphone is CRITICAL. If the microphone is positioned incorrectly, you will experience drastic reduction in volume and clarity of the intercom and radio communication.
LEFT & RIGHT DRESS
The Firecom headsets may be adjusted so the mic is on the right side (right dress) or left side
(left dress).
• Over-The-Head (FH) style headsets: Rotate the Mic Boom ONLY in an upward direction (Figure 19).
ALWAYS rotate the Mic boom upwards as shown to prevent damage to the
Mic Boom and the Mic Cable.
• Under-The-Helmet (UH) style headsets: Rotate the Mic Boom and the rear
Headband ONLY in an upward direction (Figure 20).
ALWAYS rotate the Mic Boom and the rear Headband upwards as shown to prevent damage to the Mic Boom, the Mic Cable and the Headband Cable.
HEADSET VOLUME CONTROL
Located on the ear dome of each Firecom Headset is a volume control for adjusting the volume of headset speakers. This allows each user to adjust the volume to the preferred level.
Turning the Volume Control clockwise increases the volume, turning the control counterclockwise decreases the volume.
FIGURE 20:
UH Style Headset
Adjustable Headstrap Adjustable Headstrap
IMPORTANT
IMPORTANT
IMPORTANT
FIGURE 21:
Microphone Placement
No More Than 1/8" From Lips
Headband
PTT
Volume Control
Headband
19.
20.
I N T E R C O M O P E R A T I O N
INTERCOM CONTROLS
The 3000C Intercom Unit has two controls on the front panel which affect the intercom operation (Figure 22).
VOLUME:
The Volume Control is the master control for overall volume of the 3000C Intercom
System. This volume should be set with the individual headset volumes turned all the way up. Set the Intercom Volume Control slightly louder than a comfortable listening level, then adjust the volume down using the individual volume control on each headset.
SQUELCH:
The Squelch Control adjusts the level at which the microphones turn on/off to limit the background noise. This control does NOT affect, or relate to, the radio squelch control.
This adjustment MUST be performed while the apparatus engine is running and "normal" background noise is heard.
1. Put on a Radio-Transmit Headset.
2. Turn the Squelch Control fully clockwise.
3. SLOWLY, turn the Squelch Control counter-clockwise stopping
IMMEDIATELY once the background noise is no longer heard.
Once the Squelch is properly adjusted, additional adjustment should not be necessary.
FIGURE 22:
The Intercom
Controls
Power LED
3000C
Transmit LED
Squelch Control Volume Control
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