FM Transmitter
Sistemas Electrónicos S.A EM 100 DIG
Technical Manual - v1.2 - November 2005 31
MENU # 39:POWER-DOWN SETUP.
auto power down ?
23:00 - 06:00 p=50%
This screen, with the 2
nd
level authorization, allows to preset the "power-down" mode. If this mode is
on, the output power will be automatically decreased to the pre-set percentage in the time period
set on the bottom line.
The scaled power is approximate and must be tested and/or adjusted before final setup, if critical.
2.6 Service and maintenance
Since the EM-100 DIG is cooled by forced air, it is subject to clogging by dust. It is very important to
keep clean and dust-free both heat sink fins and cooling fan, to assure a good cooling of RF Power
Module.
Install the equipment on a stable stand/rack, in such a way to permit good air circulation and hot air
exhaust. If needed, cabinet may be externally cleaned with a soft brush and a wet cloth, with the
Equipment turned off.
Other than this, because of the high-quality materials used in their manufacture, if it is installed as set
forth under “INSTALLATION, OPERATION & MAINTENANCE” it will not require special maintenance for
quite some time. Only periodical cooling fan & heat sink inspection, and fan replacement after 2
years of continuous service, even if it's yet in good conditions.
Minimum maintenance inspection is set monthly, containing the following aspects:
1.- Throughly clean Equipment externally. Clean Equipment's room and Transmitter's
environment. Check that internal humidity and room's temperature not to exceed the
allowable limits.
2.- Check by visual inspection the operational conditions of Antennas system and external
environmental conditions of Station site & building.
3.- Take all possible readings from LCD Display and log it in the Station's log book. If any trouble
is detected, it must be solved before leaving the site.
4.- Each six months, or when an anomaly is externally detected, perform a througly check of
Antenna system and transmission line, including VSWR check, frequency response curve, Return
Losses, etc. Log all checks in Station's log book.
After a few years of continuous service, it is recommended that the equipment be overhauled in the
factory or in a OMB specialized laboratory.
It is especially important that the Main Power Supply be overhauled when the Transmitter have been
working at high temperatures, over 30 /35°C.
WARNING
Never change the internal calibrations to avoid altering Transmitter Specifications.
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