Motorola ASTRO Digital XTL 5000 - Chapter 1 Introduction; General System Overview; Ordering Information

Table of Contents vii
6881096C74-B May 25, 2005
3.2.3 700–800 MHz Band.........................................................................................................3-10
3.3 Radio Power Distribution..............................................................................................................3-12
3.4 Receiver Front-End ......................................................................................................................3-13
3.4.1 VHF (136–174 MHz) Band ..............................................................................................3-13
3.4.1.1 15 dB Step Attenuator (U3250) ..............................................................................3-14
3.4.1.2 PIN Diode Switches................................................................................................3-14
3.4.1.3 Preselector Filters ..................................................................................................3-14
3.4.1.4 Low-Noise Amplifiers (Q3255, Q3252)...................................................................3-14
3.4.1.5 Mixer (D3258).........................................................................................................3-15
3.4.2 UHF Range 1 (380–470 MHz) Band ...............................................................................3-15
3.4.2.1 Highpass Filter and First Low-Noise Amplifier .......................................................3-16
3.4.2.2 Preselector Filter ....................................................................................................3-16
3.4.2.3 Switchable 15 dB Attenuator ..................................................................................3-16
3.4.2.4 Low-Noise Amplifier (LNA, U5302) ........................................................................3-16
3.4.2.5 Image Filter ............................................................................................................3-16
3.4.2.6 Mixer.......................................................................................................................3-16
3.4.3 UHF Range 2 (450–520 MHz) Band ...............................................................................3-17
3.4.3.1 Highpass Filter and First Low-Noise Amplifier .......................................................3-17
3.4.3.2 Preselector Filter ....................................................................................................3-18
3.4.3.3 Switchable 15 dB Attenuator ..................................................................................3-18
3.4.3.4 Low-Noise Amplifier (LNA, U5302) ........................................................................3-18
3.4.3.5 Image Filter ............................................................................................................3-18
3.4.3.6 Mixer.......................................................................................................................3-18
3.4.4 700–800 MHz Band.........................................................................................................3-19
3.4.4.1 Preselector Filters ..................................................................................................3-19
3.4.4.2 Low-Noise Amplifier (LNA, U6250) ........................................................................3-19
3.4.4.3 Mixer (U6251).........................................................................................................3-20
3.5 Receiver Back-End.......................................................................................................................3-20
3.5.1 VHF (136-174 MHz) Band...............................................................................................3-20
3.5.1.1 Intermediate Frequency (IF) Section......................................................................3-20
3.5.1.2 ABACUS III IC ........................................................................................................3-20
3.5.2 UHF Range 1 (380-470 MHz) Band ................................................................................3-21
3.5.2.1 Intermediate Frequency (IF) Filter..........................................................................3-22
3.5.2.2 ABACUS III IC (U5002) ..........................................................................................3-22
3.5.3 UHF Range 2 (450-520 MHz) Band ................................................................................3-23
3.5.3.1 Intermediate Frequency (IF) Filter..........................................................................3-23
3.5.3.2 ABACUS III IC (U5002) ..........................................................................................3-23
3.5.4 700–800 MHz Band.........................................................................................................3-24
3.5.4.1 Intermediate Frequency (IF) Filter..........................................................................3-25
3.5.4.2 ABACUS III IC (U6000) ..........................................................................................3-25
3.6 Transmitter ...................................................................................................................................3-26
3.6.1 VHF (136-174 MHz) Band...............................................................................................3-26
3.6.1.1 50-Watt Transmitter................................................................................................3-26
3.6.1.2 100-Watt Transmitter..............................................................................................3-28
3.6.1.3 Output Network (ON) - (for 50W and 100W Transmitter).......................................3-29
3.6.1.4 Power Control (for 50W and 100W Transmitter) ....................................................3-30
3.6.2 UHF Range 1 (380-470 MHz) Band ................................................................................3-31
3.6.2.1 40-Watt Transmitter................................................................................................3-31
3.6.2.2 100-Watt Transmitter..............................................................................................3-33
3.6.2.3 Output Network (ON) - (for 40W and 100W Transmitter).......................................3-34
3.6.2.4 Power Control (for 40W and 100W Transmitter) ....................................................3-35
3.6.3 UHF Range 2 (450-520 MHz) Band ................................................................................3-37
3.6.3.1 45-Watt Transmitter................................................................................................3-37
3.6.4 700–800 MHz Band.........................................................................................................3-41