Analog Mode Of Operation; Receiving; Figure 1. Xts 5000 Overall Block Diagram; Figure 2. Receiver Block Diagram - Motorola ASTRO XTS 5000 I Basic Service Manual

Basic Theory of Operation
External
Accessory
Connector
Note:
indicates 26
wires
Analog Mode of
Operation

Receiving

RF Input
Harmonic
Filter
XTAL
Filter
6
Universal
Flex
13
J1 P101
(Side Connector,
Controls, LEDs,
Speaker,
Microphone)
Keypad
26
Display
When the radio is receiving (see Figure 2.), the signal comes from the
antenna connector to the Transceiver board, passing through the
antenna switch and the receiver front end. The signal is then filtered,
amplified, and mixed with the first local-oscillator signal, generated by
the voltage-controlled oscillator (VCO).
Antenna Tuneable
Switch Preslector
ABACUS III - RX Back End
LO
26
P201
40
J101
VOCON
Board
22
J107
40
J701
22
J301

Figure 1. XTS 5000 Overall Block Diagram

RX Front End
Tuneable
Preselector
LNA
RF
Filter
Amp
CKO

Figure 2. Receiver Block Diagram

Antenna
P1 J2
Transceiver
Board
3
J3
Encryption
Module
(Optional)
1st LO
1st
Mixer
3
RX_SSI_ DATA
ADC
to VOCON Board
7.5V
Battery