IMPORTANT!
a) Radio system reliability and performance significantly depends on
quality acoustic accessories.
b) Extremely high performance requirements - especially for 8.33
kHz Technology - demand after installation completion proper
acoustics levelling through SET-UP in order to maintain best
radio capability. Therefore, please do not use low performance
acoustics accessories.
c) Dynamic microphone requires shielded wiring. Essential
requirement is consequent separation of microphone ground /
shield from any other ground. This means, dynamic mike ground /
shield must be separated from any other grounds for DC input
and DC output, AF input and AF output like speaker, phone, PTT
and external AF input. Other grounds for DC input and output,
speaker, phone, PTT and external AF may be connected together
with the amplified mike ground.
d) Amplified microphones may contain dynamic or Electret acoustics
transducers.
e) Always ensure IDENTICAL microphones are used for parallel
operation. Similar requirements are applicable for headphone
characteristics.
f) Always ensure that during SET-UP all of the many FSG 90(X)
functions are adjusted to achieve optimized radio system
performance.
g) Operation of amplified microphone systems close to the radiating
antenna (portable case or located right behind of the cockpit) may
be influenced from strong antenna RF field strength and become
unstable, oscillates, or causes modulation distortion. Verify this
effects -possible caused by- by RF replacing the radiating
antenna against artificial antenna / RF dummy load temporarily
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