五．1846 DESCRIPTION
MAINLY SECTION DESCRIPTION
1.DSP consists of IF amplifier, FM modulation, RSSI calculator, AFC control
circuit, audio/audio mixer filter, CTCSS/DCS filter and so on.
2.Synthesizer mainly functions：
①The synthesizer produces a local oscillator signal, used to switch the RF input
to a continuous low medium frequency.
②Synthesizer provides the base clock to adjust the VCO frequency.
1846 supports more base clocks, for example, 12.8 MHz,13MHz and so on.
4.SERIAL CONTROL INTERFACE
A three lines serial control interface is used to read the main IC and 1846 control
record. Serial control is 24 characters in length, 18 bit numeric string and 6 bit
address string.
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