Motorola Astro Digital Mobile Radio Xtl5000 Basic 6881096c73 O Manual

6881096C73-OJune 11, 2003
Basic Theory of Operation: Control Head Assembly 3-7
3.8.2 Display (W9 Control Head)
The W9 control-head assembly has an 11-character, alphanumeric, vacuum fluorescent display. It 
needs three separate voltages to operate: the cathode needs 35 V to accelerate electrons to the 
anode; the grid needs 40 V to totally shut off current flow; the filament needs 3.8 Vrms at 80 mA. 
These voltages are obtained from the transformer on the display controller board.
3.8.3 Vacuum...

June 11, 20036881096C73-O
3-8Basic Theory of Operation: Control Head Assembly
3.8.8 Vehicle Interface Port (VIP)
3.8.8.1  Remote-Mount
The VIPs allow the control head to operate outside circuits and to receive inputs from outside the 
control head. There are three VIP outputs that are used for the W9 control head and two VIP outputs 
for the W3, W4, W%, and W7 control heads. There are also three VIP inputs that accept inputs from 
switches. See the cable kit section for typical connections of VIP input...

6881096C73-OJune 11, 2003
Basic Theory of Operation: Radio-Frequency Power Amplifier (RF PA) and Output Network (ON) 3-9
3.9 Radio-Frequency Power Amplifier (RF PA) and Output Network 
(ON)
The RF PA is a three-stage power amplifier consisting of discrete LDMOS transistors:
 Controlled stage
 Driver stage
 Final stage
The RF PA is followed by the ON section consisting of discrete circuitry with the following functions:
 Antenna switch
 Harmonic Filter
 Power Detector
3.9.1 Gain Stages
The...

June 11, 20036881096C73-O
3-10Basic Theory of Operation: 700–800 Receiver Overview
3.10 700–800 Receiver Overview
The receiver circuits primary duties are to detect, filter, amplify, and demodulate RF signals in the 
presence of strong interfering noise and unintended signals. The receiver is broken down into the 
following blocks:
 Front-end (preselector and LNA)
Mixer
IF
 Back-end IC
3.10.1 Receiver Front-End 
The 700–800  MHz receiver front-end operates in two bands. The primary function of the...

6881096C73-OJune 11, 2003
Basic Theory of Operation: Frequency Generation Unit (FGU) 3-11
3.11 Frequency Generation Unit (FGU)
Figure 3-2.  Frequency Generation Unit Diagram
The frequency generation unit (FGU) (
Figure 3-2) is comprised of a fractional-N synthesizer IC, a 
16.8 MHz reference oscillator IC, two voltage-controlled oscillator (VCO) modules (receive and 
transmit, containing two VCOs each), VCO buffer/amplifier circuits, and associated circuitry.
The reference oscillator IC provides a...

June 11, 20036881096C73-O
3-12Basic Theory of Operation: Frequency Generation Unit (FGU)
Notes 

Chapter 4 Test Equipment, Service Aids, and Tools
4.1 Recommended Test Equipment
The list of equipment contained in Table 4-1 includes most of the standard test equipment required 
for servicing Motorola mobile radios, as well as several unique items designed specifically for 
servicing this family of radios. The Characteristics column is included so that equivalent equipment 
can be substituted; however, when no information is provided in this column, the specific Motorola 
model listed is either a...

June 11, 20036881096C73-O
4-2Test Equipment, Service Aids, and Tools: Service Aids and Recommended Tools
Table 4-3 contains a listing of non-Motorola test equipment recommended for servicing mobile 
radios.
4.2 Service Aids and Recommended Tools
Refer to the tables in this section for a listing and description of the service aids and tools designed 
specifically for servicing this family of radios, as well as the more common tools required to 
disassemble and properly maintain the radio. These kits...

6881096C73-OJune 11, 2003
Test Equipment, Service Aids, and Tools: Field Programming Equipment 4-3
4.3 Field Programming Equipment
The ASTRO family of radios can be aligned and programmed in the field. This requires specific 
equipment and special instructions. Refer to the online help in the Customer Programming Software 
(RVN4185).
4.3.1 XTL 5000 Field Programming
The XTL 5000 radios use a flash memory device to store information on frequencies, squelch codes, 
signaling codes, time-out timer...

June 11, 20036881096C73-O
4-4Test Equipment, Service Aids, and Tools: Field Programming Equipment
4.3.1.2  Remote-Mounted Radios
For remote-mounted radios, the cable is connected to the radio at the FLASHport connector, which 
is located on the remote faceplate of the transceiver. Another programming option is to use a direct 
adapter cable to connect the radio’s rear accessory connector, J2, to the computer. A third option is 
to use an ASTRO Packet Data cable to directly connect J6 on the remote...