FSG 90 System
6 Operating Instruction
December 2014 FAV_D10024 55
SQ ON also results in significantly lower standby current consumption and extends
battery supplied operating time.
DUAL FUNCTION while the SQ is disabled allows, that Transmit is possible even during
simultaneous receiving on this channel, in order to enable transmit whenever necessary.
Normally, in SET-UP the "BLOC" function is activated (set to "1") to prevent
overcrowded channels caused by simultaneous transmissions.
6.8 Intercom
IMPORTANT!
To achieve best cabin noise suppression, especially during speech
pauses, optimized microphone sensitivity adjustment must be performed
during SET-UP-Procedure.
Intercom headset audio volume may be adjusted through SET-UP.
1. Switch ON Intercom. This activates simultaneously the microphones, while the
speaker is disabled.
2. During Receive, through acoustic accessories (headphones with microphones), the
FSG 90(X) allows intercommunications between pilot(s) and/or other crew members.
Always speak loud and clear, while the microphone opening is located close to the
lips.
3. By pressing the PTT key the radio switches to transmit -without switching Off
Intercom. The "true active" Sidetone is heard during transmit. This allows all intercom
parties to monitor also actual cockpit radio communication.
4. Releasing the PTT key turns the radio into Intercom mode again.
5. In addition, both Receive as well as External Audio is audible while Intercom is ON.
During Receive, all other audio inputs are reduced in volume. This allows safer
listening to the radio signal.
6. Audio volumes of external audio signals are adjusted only on the external units.
6.9 AF External
In Standby and Receive mode only, through the External Audio Input, the audio signals
of additional units (another COM, VOR, Localizer, Marker, ADF, electric variometer, etc.)
are audible simultaneously via A/C loudspeaker or headphone(s).
Such complex interfacing requires that audio volume is set directly on each unit
individually.
The VOL control on the FSG 90(X) front panel is not affected by external audio sources,
and vice versa.
The External AF Input is disabled during transmit.
6.10 Lighting
Depending on aircraft wiring, lighting the frequency display is either activated by turning
ON the lighting switch or dimmer, or by turning ON the FSG 90 radio.
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