Figure 3-7. Transmitter (Vhf) Block Diagram; Figure 3-8. Transmitter (Uhf1/Uhf2) Block Diagram - Motorola APX 1000 Basic Service Manual

3-6
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 Trident IC processes the SSI data for application to the voltage controlled oscillator as a
modulation signal.
TX Buffer Amp
TX Driver Amplifier
TX VCO
RX/TX
RF Switch Matrix
TX Buffer Amp
TX Driver Amplifier
TX VCO
RX/TX
RF Switch Matrix
Figure 3-7, Figure
Antenna
Switch
Transmitter Final
FET VHF
Loop Filter
Synthesizer

Figure 3-7. Transmitter (VHF) Block Diagram

Antenna
Switch
Transmitter Final
FET UHF
TO RX
Loop Filter
Trident IC
Synthesizer

Figure 3-8. Transmitter (UHF1/UHF2) Block Diagram

Basic Theory of Operation: Analog Mode of Operation
3-8, Figure 3-9 and
Directional
Harmonic
Coupler
LP Filter
TO RX
Trident IC Ref. Oscillator
Directional
Harmonic
Coupler
LP Filter
Ref. Oscillator
Figure 3-10) via the SSI interface.
Log Amp Power Detector
Digital RF Attenuator
Antenna Connector
Reverse Power
Detection
GPS
Log Amp Power Detector
Digital RF Attenuator
Antenna Connector
Reverse Power
Detection
GPS