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136 – 174 MHz VHF Theory of Operation:
VHF Transmitter
8-3
8.3
VHF Transmitter
The VHF transmitter covers the range of 136 – 174 MHz. Depending on model, the output power of
the transmitter is switchable on a per-channel basis between high power (5 Watts) and low
power (1 Watt). The transmitter is divided into four major blocks as shown in Figure 8-2.
• Power Amplifier
• Harmonic Filter
• Power Control
Figure 8-2. VHF Transmitter Block Diagram
8.3.1
Power Amplifier
The transmitter power amplifier has three stages of amplification – Pre Driver (Q401), Driver Amp
(Q402) and Final Amp (Q403). Signal from TX VCO is applied to the pre driver via an attenuator
circuit. The attenuator is pie style resistor attenuator, and is used as isolation between VCO and the
power amps. The -3dBm TX RF signal from attenuator is then amplified by pre driver and driver amp
to 28dBm and is applied to the final amp. The final amp (Q403) is an enhancement-mode
N-channel MOSFET device providing a gain of 12dB. The device drain current is drawn directly from
the DC battery supply voltage input via L413. A matching network consisting of C417, C418, C419,
C420, C455 and a strip line, transforms the impedance to approximately 50 Ohm.
8.3.2
Antenna Switch
An antenna switch works mainly as a switching device between transmit and receive paths. In
transmit mode (PTT), Q407 is turned on and both PIN diodes (CR401, CR301) are forward biased
into conduction. This enables the RF signal to pass to the harmonic filter and then to the antenna. In
the receiver mode, both diodes are off. Signals applied to the antenna jack are routed via the LPF
(harmonic filter), through a TX Low Pass Filter (L409 – L411, C426 – C430, C445 and C446), to the
receiver input.
8.3.3
Harmonic Filter
The harmonic filter consists of components L409 – L411, C426 – C430, C445 and C446. The
harmonic filter is a seven-pole elliptic filter.
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Содержание P100 Series
Страница 1: ...P100 Series Portable Radios Detailed Service Manual ...
Страница 2: ......
Страница 8: ...iv Notes ...
Страница 18: ...xiv List of Tables Notes ...
Страница 22: ...xviii Summary of Printed Circuit Boards and Bands Available Notes ...
Страница 30: ...Notes 2 4 Test Equipment Service Aids and Service Tools Service Aids ...
Страница 54: ...7 4 UHF2 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 128: ...7 78 Circuit Board Schematic Diagram and Parts List UHF2 435 480 MHz Notes ...
Страница 150: ...7 100 Circuit Board Schematic Diagram and Parts List UHF2 MDC QCII R TTE 435 470 MHz Notes ...
Страница 166: ...10 4 VHF Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 192: ...10 26 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 218: ...10 52 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 242: ...10 76 Circuit Board Schematic Diagram and Parts List VHF MDC QCII R TTE 136 174 MHz Notes ...
Страница 258: ...13 4 UHF1 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 261: ...Circuit Board Schematic Diagram and Parts List UHF1 403 447 MHz 13 7 Figure 13 5 Transmitter Schematic Diagram ...
Страница 328: ...13 74 Circuit Board Schematic Diagram and Parts List UHF1 MDC QCII R TTE 403 447 MHz Notes ...
Страница 332: ...A 4 Warranty Service Support and Replacement Parts Further Assistance From Motorola Notes ...
Страница 335: ......