Motorola 146-174 MHz Manuel D’Utilisation

 

August 13, 1996

6880904Z07-O

 

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.

 

Any differences in the controller between the VHF and UHF RF bands will be on the controller schematic 
and parts list. 

 

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.

 

1.

Unless otherwise indicated, resistor values are in ohms, capacitor values are in picofarads, and inductor 
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

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.

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.

 

C2, 3, 4

2113740A43

39pF 

 

±

 

5%; 50V

 

L1, 2

2484657R01

Ferrite Bead

 

F1

6505663R044

4Amp.

63A81084C55-O

MAEPF-25509-O

MAEPF-25508-O

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

 

C1

2113740A41

33pF 

 

±

 

5%; 50V

LS1

5005589U05

 

MICROPHONE:

MK1

5013920A04

INT
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

RADIO SIDE

CONNECTOR