E.F. Johnson 5100 SERIES Service Manual - page 6
1-1
September 2001
Part No. 001-5100-001
GENERAL INFORMATION
SECTION 1 GENERAL INFORMATION
1.1 SCOPE OF MANUAL
This service manual contains alignment and
service information for the E.F. Johnson 5100-Series
portable digital transceivers.
1.2 TRANSCEIVER DESCRIPTION
1.2.1 GENERAL
The 5100-series portable digital transceivers have
multiple system select capability to allow operation in
various types of radio systems (see next sections).
Models are available for operation in the following
frequency ranges: VHF 136-174 MHz, UHF low 403-
470 MHz, UHF high 450-512 MHz, and 800 MHz
806-870 MHz. Repeater talk-around, which allows
transmitting on the receive frequency, is also available
with all bands. Power output is user switchable for low
and high levels as follows:
VHF - 1 and 5 watts
UHF - 1 and 4 watts
800 MHz - 3 watts only
1.2.2 ANALOG/DIGITAL OPERATION
The 5100-series transceivers use a digital signal
processor (DSP) to provide the signal modulation
required to operate on the following types of channels.
This provides backwards compatibility with existing
equipment and also the ability to operate on various
types of radio systems.
Narrow Band Analog - FM modulation is used with a
maximum deviation of 2.5 kHz. This mode is usually
used in systems with a channel spacing of 12.5 kHz.
Wideband Analog - FM modulation is used with a
maximum deviation of 5 kHz. This mode is usually
used in systems where the channel spacing is 25 kHz
or 30 kHz.
Project 25 Digital - Operates on Project 25 compatible
systems. The voice is digitized, error corrected,
optionally encrypted, and then transmitted using
C4FM modulation according to the Project 25 stan-
dard. This mode uses a channel spacing of 12.5 kHz.
1.2.3 OPERATING PROTOCOLS
The 5100-series transceivers can be programmed
for all the following operating protocols. Refer to
Section 2 for more operation information.
•
Conventional analog
•
Conventional Project 25 (digital)
•
Trunked Project 25 (digital)
•
SMARTNET
™
/SmartZone
®
analog or Proj 25
(digital)
•
Multi-Net
®
trunked (analog)
1.2.4 18-KEY/6-KEY MODELS
Both 18-key and 6-key models are available. The
18-key version includes number keys 0-9 for making
telephone calls, entering unit or group ID numbers,
and keypad programming. The other keys (*, #, and
F1-F4) have dual functions. They can be assigned a
function using the programming software and are also
used to navigate through menus. The 6-key models
have keys below the display which are programmable
function keys, and also keys that are used for menu
navigation.
1.2.5 SYSTEMS, CHANNELS, AND ZONES
A zone and channel are selected to place and
receive calls. The following describes the relationship
between systems, channels, and zones.
Systems
A system as used with this transceiver is a collec-
tion of channels (talk groups) belonging to the same
repeater site. A system defines all the parameters and
protocol definitions required to access a site. Up to
1 conventional system and 15 SMARTNET/
SmartZone systems can be programmed (16 total).