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VHF/AM RADIO FSG 2T
3 Installation
38 FAV_D10048 June 2014
3.5.3 Intercom (IC)
INTERCOM is suitable for two seat aircraft with noisy cockpit. Intercom as well as radio
operation should employ suitable aircraft headsets and must be matched properly to the
transceiver (refer to § 4.2, Microphone Set-up).
Hand-held microphones in combination with earphones can be used for Intercom as
well, provided that the MIC audio output is not switched by the PTT function. Otherwise
keying the mike audio may cause awful cracks, depending on mike technology, and will
accidentally activate the transmitter.
To control the Intercom capability, aircraft radio wiring must have a double pole toggle
selector switch (refer to Figures 3 - 5 to 3 - 8). The Intercom switch disconnects the
loudspeaker during Intercom operation in the IC ON position. Simultaneously, pin 5 of
the 15-pole connector is set to ground to select Intercom ON by continuously activating
the microphone signal input (amplifier).
There are two operating modes of Intercom:
Voice / VOX controlled: at sufficient voice audio volume (MIC signal) the threshold
opens and intercommunication takes place. The GREEN TX/RX LED indicates
sufficient microphone level. This feature is only available when the AF External input
is disabled (default setting).
Continuously: Intercommunication is possible continuously. Any MIC signal is then
amplified and audible through the headphone, also noise. This Intercom operating
Mode is available when the AF External input is enabled by an approved Avionics
workshop. The GREEN TX/RX LED indicates sufficient microphone level.
During RX the Intercom audio level is reduced by 6 dB (half level).
3.5.4 Loudspeaker / Headset interconnection
Two separate AF outputs are available:
The speaker output pin 15 can supply one 4-Ohm (or two 8-Ohm) speaker.
The headphone audio output Pin 14 can accommodate two (2) or more headphones
each with some 30 to 600 Ohms.
When no loudspeaker is installed, pin 15 may remain open, no spare load is required.
CAUTION!
Your magnet compass may be deflected by the speaker's magnetic
field. Therefore, when using the f.u.n.k.e. Loudspeaker / Junction
Box F10061, a minimum distance of 1.3 m / 4.3 ft. between compass
and Box is required.