2.Voltage and current at RF part
1.Voltage and current at RF part
Low(CH42-01) Mid(CH43-47) High(CH45-47)
Vce 3.5V 3.5V 3.4
Ic 25mA 26mA 28mA
2.Description of main feature of circuit
(1)Stabilization of frequency
Oscillation method :PLL synthesized
The stabilization of this oscillation method relies on crystal oscillator performance.
Its accecting range is frequency deviation plus-minus 10ppm or less,under -10 degree to +60 degree
temperature by using Tokyo Denpa made crystal oscillator.
(2)How to reduce the spurious radiation
In order to suppress the radiation,LC filter is positioned after current amplification part.
It is low passed filter which forms pie shape with third layered.
(3)Restriction of Audio modulation
In order to restrict audio modulation,diode limiter circuit(ZD101,ZD102) is put into
pre-emphasis circuit.
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