User's Manual

PRELIMINARY
PRELIMINARY PRELIMINARY
PRELIMINARY –
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frequencies. The resulting signal goes to the VCO through the VCO
modulation terminal for direct FM modulation. (See Fig. 6)
7
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QT/DQT encoder
A necessary signal for QT/DQT encoding is generated by IC403 and FM-
modulated to the PLL reference signal. Since the reference OSC does
not modulate the loop characteristic frequency or higher, modulation is
performed at the VCO side by adjusting the balance. (See Fig. 6)
•6. Transmit audio QT/DQT
8
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VCO and RF amplifier
The transmit signal obtained from the VCO buffer amplifier Q100, is
amplified by Q101. This amplified signal is passed to the power
amplifier, Q102 and Q105, which consists of a 2-stage FET amplifier and
is capable of producing up to 5W of RF power (See Fig. 7)