FSG 90 System
3 Installation
28 FAV_D10024 December 2014
3.6.3 Intercom (IC)
Intercom is suitable for twin seater aircraft with noisy cockpit. Intercom as well as radio
operation should employ suitable aircraft headsets which must be matched properly to
the transceiver (refer to SET-UP).
Hand-held microphones may be useful for intercom, if audio is not switched/keyed ON /
OFF by the PTT function. Keying the mike audio may cause awful cracks, depending on
mike technology.
To control the intercom capability, aircraft radio wiring must have a two-pole toggle
switch (refer to figure 3-6 or 3-7). The intercom switch disconnects the loudspeaker
during IC operation in the IC ON position. Simultaneously, pin 7 of the 25-pole connector
is set to ground to select IC ON by continuously activating the microphone amplifier input
signal.
With the IC switch in "ON" position it is possible anytime to perform normal transmitting
(with the normal PTT key), it also allows continuous intercommunication during receive
between pilot and co-pilot/crew (no PTT action is required for any IC operation).
During receiving, while IC is ON, both the IC loudness and external audio volume are
temporarily reduced to improve receive intelligibility.
Receiving volume is set on the FSG 90(X) front panel (VOL), while intercom volume can
be optimized by SET-UP adjustment.
3.6.4 Loudspeaker / Headset interconnection
Two separate AF output exist. The speaker output pin 1 can continuously supply up to
two speakers each with 4 Ohms (load > 2 Ohms), while the headphone audio output
pins 2 and 3 can accommodate up to 2 or more headphones each with some 600 Ohms,
or all may be connected also simultaneously.
When no speaker is installed, Pin 1 may remain not connected, no spare load is
required.
CAUTION!
The magnet compass is deflected by the speaker's magnetic field.
Therefore, when using the f.u.n.k.e. compact speaker box F10061, a
minimum distance of 1.3 m/4.3 ft. between compass and speaker is
required.
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