ZETRON 15P, Руководство по эксплуатации

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4-1
4. INSTALLATION
INSTALLATION WARNING
This equipment generates, uses, and can radiate radio frequency energy. If not installed and
used in accordance with the manual and commonly used radio practices, this equipment may
cause interference to radio communications. Installation of this equipment should be
accomplished by personnel with experience in radio and paging systems.
OPENING THE EPNCODER
Place the unit face down on a table top and lift off the bottom cover. The component side of
the circuit board will be exposed, including the transmitter interface connector and
configuration jumpers. After configuration is complete install four 7/8-inch #4 self-tapping
screws at the upper and lower edges of the case to retain the bottom cover.
WIRE ROUTING
Route all connecting wires through the hole in the rear of the bottom case and secure them
with the tie-wrap restraint on the bottom case.
GROUNDING
It is recommended that shielded cabling be used on all audio connections between the
encoder, microphone, and radio. It is advisable that one primary point be chosen as a system
ground point and that all signal grounds be returned to this “unipoint” ground to reduce
ground-loop noise. This is especially important when low-level non-preamp microphone
circuitry is being used. Connect the encoder ground, TB1 pin 5, to the system ground point.
POWER SUPPLY
If using the 12 VAC wall transformer supplied with the encoder or other 12 VAC source,
connect the AC leads to pins 1 and 2 on the terminal strip TB1.
A +12 to +14 VDC power supply may also be used. If using a DC supply, connect the
positive (+) lead to pin 1 of TB1 and the ground (-) to pin 5 of TB1.
AUDIO OUTPUT
The audio output from the encoder is obtained from TB1 pin 4. This pin is internally
switched by the Model 15P's audio circuits between the tone generator output and the
external microphone input. When idle and during Talk time TB1 pin 4 is normally connected
to the microphone input.