User's Manual
3800 Information
October 2009 3800 Digital Repeater Operating Manual 1 -3
1.2 Functional Description
The EF Johnson Technologies 3800 Series Digital Repeater is a trunked repeater with built-in trunking
control. The Trunked IP25 System Channel Controller function is integrated into the repeater subsystem.
The 3800 Repeater uses frequency synthesizer and Digital Signal Processor (DSP) technologies to
provide digital control of the radio channels. Software defined configurations allow for quick updates and
programmable operating frequency, output power, and other key functions.
Multiple repeaters may be used per site to accommodate multiple frequency bands and provide radio
backup. The 3800 is comprised of the following functional modules
( Figure 1.2):
Figure 1.2 3800 Repeater Subsystem Functional Diagram
Channel Controller
All channels are managed by the integrated Channel Controller. The controller provides overall channel
control for control and traffic channels in a repeater. It manages the radio transmitter and receiver
frequency assignments and power levels. The Channel Controller checks channel status and reports any