Motorola 438-470 MHz 用户手册
August 13, 1996
6880904Z07-O
6-1
Section 616
Section 7
General
Controller components and transceiver components are all part of a single circuit board. Two circuit boards
(component location diagrams), VHF and UHF, show transceiver and controller components.
(component location diagrams), VHF and UHF, show transceiver and controller components.
Controller
Any differences in the controller between the VHF and UHF RF bands will be on the controller schematic
and parts list.
and parts list.
Transceiver
Each bandsplit (VHF or UHF) will include 12.5 and 25KHz channel spacing. Any differences between 12.5
and 25KHz channel spacing will be denoted on the particular VHF or UHF schematic and corresponding
parts list.
and 25KHz channel spacing will be denoted on the particular VHF or UHF schematic and corresponding
parts list.
Schematic Notes
1.
Unless otherwise indicated, resistor values are in ohms, capacitor values are in picofarads, and inductor
values are in microfarads.
values are in microfarads.
2.
Non-polarized capacitors are chip-type unless otherwise indicated.
3.
Polarized capacitors are titanium chip-type unless otherwise indicated.
4.
“NU” means that a component is not used.
5.
DC voltages are measured with a high impedance (10 megohm) DC voltmeter.
6.
AC voltages are measured with a high impedance AC RMS voltmeter.
7.
All voltages measured are in the receive mode unless indicated otherwise. Indications are as follows:
(R) Receive Mode
(T) Transmit Mode
(R) Receive Mode
(T) Transmit Mode
8.
Measured in the receive mode with an on-channel unmodulated signal at a level of -20dBm.
9.
Measured in the receive mode with an on-channel unmodulated signal at a level of -20dBm, modulated
with 1kHz at 3kHz deviation (for 20/25kHz models) or 1.5kHz deviation (for 12.5kHz models), mea-
sured with an AC RMS voltmeter.
with 1kHz at 3kHz deviation (for 20/25kHz models) or 1.5kHz deviation (for 12.5kHz models), mea-
sured with an AC RMS voltmeter.
10. Same as note 8, except with volume control adjusted for 500 milliwatts (2.82 volts RMS across a 16-
ohm load connected to the external speaker jack.
11. Measured in the transmit mode with a 1kHz, 11mV RMS signal applied to the external microphone
input.
Parts List:
0180702Y89 Battery Filter Board
0180702Y89 Battery Filter Board
REFERENCE
SYMBOL
MOTOROLA
PART NO.
DESCRIPTION
CAPACITOR, Fixed:
C2, 3, 4
2113740A43
39pF
±
5%; 50V
COIL, RF:
L1, 2
2484657R01
Ferrite Bead
FUSE:
F1
6505663R044
4Amp.
63A81084C55-O
MAEPF-25509-O
MAEPF-25508-O
Battery Filter Board
Internal Speaker
Speaker Common
Ground
Internal Microphone
External Select
External Speaker
External Microphone
Speaker Common
External Microphone
External Speaker
Ground
External Select
MAEPF-25510-O
Flex Circuit
Parts List:
Flex Circuit
Flex Circuit
REFERENCE
SYMBOL
MOTOROLA
PART NO.
DESCRIPTION
CAPACITOR, Fixed:
C1
2113740A41
33pF
±
5%; 50V
LS1
5005589U05
SPEAKER
MICROPHONE:
MK1
5013920A04
Electret
INT
SPKR
SPKR
J5
INT SPKR 1
SPKR COM 2
GND 3
INT MIC 4
EXT SEL 5
EXT SPKR 6
EXT MIC 7
EXT MIC
EXT MI
EXT SPKR
EXT SPKR
EXT SEL
EXT SEL
LS1
C1
MK1
GND
GND
SPKR COM
SPKR COM
INT
MIC
MIC
RADIO SIDE
CONNECTOR
Battery Filter Board and Flex Circuit
Circuit Board Details, Schematic Diagrams, and Parts Lists
Circuit Board Details, Schematic Diagrams, and Parts Lists