025-9567E 29
ENCODER INSTALLATION
OVERVIEW
This section of the manual covers the installation of the Model 25 Encoder panel (with or
without keypad and display). The installation of the Auxiliary panel is covered in the next
section.
It is highly recommended that this equipment be installed by technicians with experience in
the land mobile radio area of electronics. In particular, the installation of the Model 25
encoder and auxiliary panel should be accomplished by personnel with experience in
selective signaling and radio dispatch console systems.
INSTALLATION PRECAUTIONS
RFI Caution
CAUTION
This equipment generates, uses, and can radiate radio frequency energy; and if not
installed and used in accordance with the instruction manual, may cause interference
to radio communication.
Proper Grounding of the Model 25
Installation of the Model 25 into any communications console or system requires that proper
grounding techniques be followed. Failure to provide the individual units with the proper
“ground reference” could result in one or more of the following symptoms.
1. The unit or units operate erratically when handled or touched, other equipment or
conductive material connected to the unit that is not properly grounded may also
display this problem.
2. The audio output levels may be unusually low. The Model 25 is capable of providing
sufficient amplitude for driving most standard audio input devices. However, without
the proper grounding the encoder’s audio will appear to be low or may vary over
time.
3. The unit may appear to reset itself unexpectedly. If a ground problem exists,
variations in the supply voltage may occur. The Model 25 is equipped with a reset
circuit that is sensitive to variations in the supply voltage. When this variation is
detected, the Model 25 may reset to insure that proper operation is maintained.
Refer to Figure 4 for information on proper grounding of the Model 25.
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