4.1 - 8 MTP700 Portable Radio / Detailed Service Manual TRANSCEIVER 400 MHz
RX Second Local Oscillator (LO)
The second LO synthesizer supplies the second IF local oscillator signal to the receiver.
The signal of the frequency of 219.3 MHz will be used in the WPIC to generate the quad-
rature signals for downconverting the received IF signal to the baseband (zero IF).
Transmit PLL
The TX PLL consists of a discrete TX Voltage Controlled Oscillator (TX VCO) and the
ESCORT Synthesizer IC. The ESCORT IC receives its reference signal
(TETRA_TX_LO) from the main synthesizer/VCO to synthesize the TX VCO signal within
the frequency range of 380-430 MHz, which is subsequently routed to the transmitter
path (LNODCT).
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