viii
Table of Contents
September 5, 2008
6881076C25-E
3.5.1.5
RX Buffer Circuitry..................................................................................................3-48
3.5.1.6
Frequency Divider and TX Buffer Circuitry.............................................................3-48
3.5.2
UHF Band........................................................................................................................3-49
3.5.2.1
General...................................................................................................................3-49
3.5.2.2
Super Filter 8.6 V ...................................................................................................3-49
3.5.2.3
VCO........................................................................................................................3-49
3.5.2.4
Receive Mode (AUX2* Low)...................................................................................3-49
3.5.2.5
Transmit Mode (AUX2* High).................................................................................3-49
3.5.2.6
Bandshift Circuit .....................................................................................................3-49
3.5.2.7
Output Buffer ..........................................................................................................3-49
3.5.2.8
First Buffer..............................................................................................................3-49
3.5.2.9
Doubler...................................................................................................................3-50
3.5.2.10 Synthesizer Feedback............................................................................................3-50
3.5.2.11 Second Buffer.........................................................................................................3-50
3.5.2.12 Receive/Transmit Switch........................................................................................3-50
3.5.3
800 MHz Band.................................................................................................................3-50
3.5.3.1
General...................................................................................................................3-50
3.5.3.2
Super Filter 8.6 V ...................................................................................................3-50
3.5.3.3
VCO........................................................................................................................3-50
3.5.3.4
Receive Mode-AUX 1* and AUX 2* High ...............................................................3-51
3.5.3.5
Transmit Mode-AUX 1* High; AUX 2* Low.............................................................3-51
3.5.3.6
TalkAround Mode-AUX 1* Low; AUX 2* Low .........................................................3-51
3.5.3.7
VCO Buffer .............................................................................................................3-51
3.5.3.8
First Buffer Circuit...................................................................................................3-51
3.5.3.9
Doubler...................................................................................................................3-51
3.5.3.10 Second Buffer.........................................................................................................3-52
3.5.3.11 K9.4 V Switch .........................................................................................................3-52
3.6
Receiver Front-End ......................................................................................................................3-53
3.6.1
VHF Band........................................................................................................................3-53
3.6.1.1
General...................................................................................................................3-53
3.6.1.2
Theory of Operation ...............................................................................................3-53
3.6.2
UHF Band........................................................................................................................3-53
3.6.2.1
General...................................................................................................................3-53
3.6.2.2
Theory of Operation ...............................................................................................3-54
3.6.3
800 MHz Band.................................................................................................................3-54
3.6.3.1
General...................................................................................................................3-54
3.6.3.2
Theory of Operation ...............................................................................................3-54
3.7
Power Amplifiers ..........................................................................................................................3-55
3.7.1
VHF Band Power Amplifiers............................................................................................3-55
3.7.1.1
High-Power Amplifier..............................................................................................3-55
3.7.1.1.1 Transmitter ......................................................................................................3-55
3.7.1.1.2 Antenna Switch and Harmonic Filter ...............................................................3-56
3.7.1.1.3 Power Control Circuitry ...................................................................................3-57
3.7.1.2
25/10-Watt Power Amplifier....................................................................................3-59
3.7.1.2.1 Antenna Switch and Harmonic Filter ...............................................................3-60
3.7.1.2.2 Power Control Circuitry ...................................................................................3-60
3.7.1.3
50-Watt Power Amplifiers.......................................................................................3-63
3.7.1.3.1 Transmitter ......................................................................................................3-63
3.7.1.3.2 Antenna Switch and Harmonic Filter ...............................................................3-64
3.7.1.3.3 Power Control Circuitry ...................................................................................3-65
3.7.2
UHF Band Power Amplifiers............................................................................................3-68
3.7.2.1
High-Power Amplifier..............................................................................................3-68
3.7.2.1.1 Transmitter ......................................................................................................3-68
3.7.2.1.2 Antenna Switch and Harmonic Filter ...............................................................3-69
Содержание ASTRO Digital Spectra
Страница 1: ...ASTRO Digital Spectra and Digital Spectra Plus UHF VHF 800 MHz Mobile Radios Detailed Service Manual ...
Страница 2: ......
Страница 6: ...September 5 2008 6881076C25 E iv Document History Notes ...
Страница 20: ...xviii List of Tables September 5 2008 6881076C25 E Notes ...
Страница 24: ...September 5 2008 6881076C25 E xxii CommercialWarranty Notes ...
Страница 48: ...September 5 2008 6881076C25 E xlvi Model Numbering Charts and Specifications Notes ...
Страница 142: ...September 5 2008 6881076C25 E 3 82 Theory of Operation Power Amplifiers Notes ...
Страница 218: ...September 5 2008 6881076C25 E 4 76 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Страница 258: ...September 5 2008 6881076C25 E 6 14 Troubleshooting Waveforms ASTRO Digital Spectra Plus VOCON Board Waveforms Notes ...
Страница 434: ...September 5 2008 6881076C25 E Glossary 10 Notes ...
Страница 440: ...Index 6 September 5 2008 6881076C25 E Notes ...
Страница 441: ......