Technical data

VHF/AM RADIO FSG 2T
3 Installation
34 FAV_D10048 June 2014
3.5.2 Wiring the Microphone(s)
IMPORTANT!
 Radio performance and system reliability significantly depend on quality
acoustic accessories, and their proper audio leveling adjustments.
 After installation completion, optimized acoustics performance requires
proper mike audio system selection and its appropriate initial level
adjustment (non-amplified dynamic, or Standard carbon microphone(s)
system).
 It is possible to connect two microphones in parallel, but: make sure that
only microphones of identical type / characteristics may be interconnected
in parallel and appropriately together adjusted / matched. Please avoid use
of low quality / low performance accessories.
 Dynamic microphones require shielded wiring and galvanic separation of
mike grounds from any other signal ground (e.g. DC input / DC output,
Speaker, phone, PTT, and external AF input ground). The MIC GND should
only be connected at the radio's end!
 Standard Carbon / compatible Amplified microphones may employ Dynamic
or Electret acoustics transducers. Amplified microphone ground may be
connected together with other grounds, e.g. for DC input / switched output,
speaker, phone, PTT, dimmer, external audio input.
 Operation of amplified microphone systems close to the RF radiating
antenna (on portable case or located close to the cockpit) may be heavily
interfered from own radiated strong antenna RF field strength and become
unstable, oscillates or causes modulation distortion. Verify such effects,
which are possibly caused by RF, by replacing the radiating antenna
against a temporarily connected artificial antenna / RF dummy load.