Basic Theory of Operation
: Analog Mode of Operation
3-7
Figure 3-8. Transmitter (700/800 MHz) Block Diagram
3.2.2.1 VHF Transmit
Once a VHF frequency for transmit has been selected, the Trident IC and the accompanying logic
circuitry will enable the voltage controlled oscillator which then generates the desired transmit
frequency. This transmit signal is then routed to the TX buffer amplifier which amplifies the signal.
The signal is routed to the VHF Driver amplifier and then to the discrete final power amplifier. The
signal now goes through the antenna switch which routes the power to the harmonic filter which will
filter out the harmonics of the carrier signal and then passes through a directional coupler. The Log
Amp power detector Monitors the output of the directional coupler and adjusts the control voltages to
the driver amplifier and final power amplifier. Finally, the RF signal is routed to the main antenna.
3.2.2.2 UHF1/UHF2 Transmit
Once a UHF frequency for transmit has been selected, the Trident IC and the accompanying logic
circuitry will enable the voltage controlled oscillator which then generates the desired transmit
frequency. This transmit signal is then routed to the TX buffer amplifier which amplifies the signal.
The signal is routed to the UHF1/UHF2 Driver amplifier and then to the discrete final power amplifier.
The signal now goes through the antenna switch which routes the power to the harmonic filter which
will filter out the harmonics of the carrier signal and then passes through a directional coupler. The
Log Amp power detector Monitors the output of the directional coupler and adjusts the control
voltages to the driver amplifier and final power amplifier. Finally, the RF signal is routed to the main
antenna.
3.2.2.3 700/800 MHz Transmit
Once a 700/800 MHz frequency for transmit has been selected, the Trident IC and accompanying
logic circuitry enable the correct voltage controlled oscillator which then generates the desired
transmit frequency. This transmit signal is then routed to the TX buffer amplifier which amplifies the
signal. The signal is routed to the 7800 Driver amplifier and then to the discrete final power amplifier.
The signal now goes through the antenna switch which routes the power to the harmonic filter which
will filter out the harmonics of the carrier signal and then passes through a directional coupler. The
Log Amp power detector Monitors the output of the directional coupler and adjusts the control
voltages to the driver amplifier and the discrete final power amplifier. Finally, the RF signal is routed
to the main antenna.
Trident IC
Synthesizer
Loop Filter
TX VCO
RX/TX
VCO
RF Switch Matrix
TX Buffer Amp
TX Driver Amplifier
Transmitter Final
FET 7/800 Mhz
Harmonic
LP Filter
Ref. Oscillator
Antenna Connector
Directional
Coupler
Antenna
Switch
TO RX
GPS
Reverse Power
Detection
Log Amp Power Detector
Digital RF Attenuator
Содержание APX 4000
Страница 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li BASIC SERVICE MANUAL ...
Страница 6: ...Notes iv Commercial Warranty ...
Страница 8: ...ii Notes ...
Страница 16: ...x Portable Radio Model Numbering System Notes ...
Страница 46: ...3 12 Basic Theory of Operation Controller Section Notes ...
Страница 60: ...5 12 Performance Checks Transmitter Performance Checks Notes ...
Страница 90: ...6 30 Radio Alignment Procedures Performance Testing Figure 6 41 Transmitter Test Pattern Screen 900 MHz ...
Страница 128: ...8 34 Disassembly Reassembly Procedures Ensuring Radio Submergibility Notes ...
Страница 138: ...10 6 Exploded Views and Parts Lists APX 2000 APX 4000 APX 4000Li Back Kit Exploded View Parts List Notes ...
Страница 142: ...Index 4 Index Notes ...
Страница 143: ...Title Page ASTRO APX 1000 Digital Portable Radios Section 2 VHF UHF1 UHF2 700 800 MHz APX 1000 ...
Страница 144: ...ii Notes ...
Страница 150: ...viii List of Figures Notes ...
Страница 152: ...x Portable Radio Model Numbering System Notes ...
Страница 208: ...6 24 Radio Alignment Procedures Performance Testing Figure 6 30 Transmitter Test Pattern Screen 700 800 MHz ...
Страница 240: ...7 32 Disassembly Reassembly Procedures Ensuring Reliable Splash Protection Notes ...
Страница 250: ...9 6 Exploded Views and Parts Lists APX 1000 Back Kit Exploded View Parts List Notes ...
Страница 254: ...Index 4 Index Notes ...
Страница 255: ...Title Page ASTRO APX 1000 Digital Portable Radios Section 3 900 MHz APX 1000 ...
Страница 256: ......
Страница 262: ...viii List of Figures Notes ...
Страница 264: ...x Portable Radio Model Numbering System Notes ...
Страница 278: ...3 8 Basic Theory of Operation Controller Section Notes ...
Страница 336: ...7 32 Disassembly Reassembly Procedures Ensuring Reliable Splash Protection Notes ...
Страница 346: ...9 6 Exploded Views and Parts Lists APX 1000 Back Kit Exploded View Parts List Notes ...
Страница 350: ...Index 4 Index Notes ...
Страница 351: ...Title Page ASTRO APX APX 2000 APX 4000 Digital Portable Radios Section 4 APX 2000 APX 4000 Two Knobs ...
Страница 352: ...ii Notes ...
Страница 360: ...x Portable Radio Model Numbering System Notes ...
Страница 400: ...5 12 Performance Checks Transmitter Performance Checks Notes ...
Страница 427: ...Radio Alignment Procedures Performance Testing 6 27 Figure 6 34 Transmitter Test Pattern Screen 700 800 MHz ...
Страница 428: ...6 28 Radio Alignment Procedures Performance Testing Notes ...
Страница 434: ...7 6 Encryption Erase an Encryption Key Notes ...
Страница 478: ...8 44 Disassembly Reassembly Procedures Ensuring Radio Submergibility Notes ...
Страница 488: ...10 6 Exploded Views and Parts Lists APX 2000 APX 4000 Two Knobs Back Kit Exploded View Parts List Notes ...
Страница 489: ...Title Page ASTRO APX 1000 APX 2000 APX 4000 APX 4000 Li Digital Portable Radios Section 5 Appendices ...
Страница 490: ...ii Notes ...
Страница 492: ...A 2 Accessories Notes ...
Страница 496: ...Notes B 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Страница 500: ...C 4 LACR Replacement Parts Ordering and Motorola Service Centers Motorola Service Centers Notes ...
Страница 520: ...Glossary 12 Glossary Notes ...
Страница 524: ...Index 4 Index Notes ...
Страница 525: ......