Motorola APX 1000 Basic Service Manual page 382

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
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 3-6, Figure 3-7
Antenna
Switch
Transmitter Final
FET VHF
Loop Filter
Synthesizer
Figure 3-6. Transmitter (VHF) Block Diagram
Antenna
Switch
Transmitter Final
FET UHF
TO RX
Loop Filter
Trident IC
Synthesizer
Figure 3-7. Transmitter (UHF1/UHF2) Block Diagram
Basic Theory of Operation: Analog Mode of Operation
and Figure 3-8) via the SSI interface. The Trident IC
Directional
Harmonic
Coupler
LP Filter
TO RX
Trident IC Ref. Oscillator
Directional
Harmonic
Coupler
LP Filter
Ref. Oscillator
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