User's Manual

FILE: IS 400 Service manual.doc 2005.11.29
E- TECH Co., Ltd 16/16
5) to select
26. Scramble
1).
to enter Menu Mode.
2)
or to until
3)
to select
4)
or to select ON /OFF.
5)
to select
27. Status call Send
1).
to enter Menu Mode.
2)
or to until
3)
to select
4)
or to select ON /OFF.
5)
to select
5. Circuit Description.
5-1 Transmitter
1) MIC AMP Circuit
Voice signal from the microphone are applied to microphone amplifier U303. U303 contains a
low-pass filter that has a 6dB/oct response between 300Hz and 3kHz and eliminate above
3kHz. The pre-emphasized audio signal is applied to VR302 to adjust maximum frequency
deviation.