Hytera PD78XG - Two-Point Modulation

UHF5 (806-941MHz) Information Service Manual
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status via OMAP. The high VCO is composed of the oscillator loop and Q104, to provide carrier for the
LO signal and TX signal. The low VCO is composed of the oscillator loop and Q108, to provide carrier for
the LO signal and TX signal.
10.3.3 Two-point Modulation
In TX mode, the two-point modulation technology is employed, to obtain higher modulation accuracy and
lower 4FSK bit error rate. MOD-VCO and MOD-XO send the modulation signal to the modulation end of
VCO and the reference crystal oscillator of PLL respectively to modulate TX VCO and the reference
crystal oscillator.