Figure 3-7. Transceiver (Vhf) Block Diagram; Figure 3-8. Transceiver (Uhf1) Block Diagram - Motorola APX 5000 Service Manual

Basic Theory of Operation: Analog Mode of Operation
3.2.2 Transmitting
When the radio is transmitting, microphone audio is digitized and then processed by the DSP and
sent to the Trident IC (see
the SSI data for application to the voltage controlled oscillator as a modulation signal.
TX Buffer Amp
RF Switch Matrix
TX Buffer Amp
TX Driver Amplifier
TX VCO
Module
RX/TX
VCO
Module
RF Switch Matrix
Figure 3-7
Transmitter Final FET VHF
TX Driver Amplifier
Loop Filter
TX VCO
Module
RX VCO
Module

Figure 3-7. Transceiver (VHF) Block Diagram

Transmitter Final FET UHF1
Loop Filter

Figure 3-8. Transceiver (UHF1) Block Diagram

to Figure 3-10) via the SSI interface. The Trident IC processes
SP3T RF Switch
Harmonic LP Filter
TO RX
Trident IC
Synthesizer
SP3T RF Switch
Harmonic LP Filter
TO RX
Trident IC
Synthesizer
Log Amp Power Detector
Digital RF Attenuator
Directional
Coupler
Reverse Power Detection
Ref. Oscillator
Log Amp Power Detector
RMT port
Digital RF Attenuator
SP2T RF Switch
Directional
Coupler
Reverse Power Detection
GPS
Ref. Oscillator
Sec 1: 3-7
Antenna Connector
Antenna Connector