UHF2 (450-520MHz) Information Service Manual
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is composed of the oscillator loop and Q108, to provide carrier for TX signal.
8.3.3 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.
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