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User Manual
Rev. 1.0 - 12/07/20
TEX52TFT
ELETTRONICA
4.2 Features
This transmitter contains a low-pass filter that reduces harmonic emissions below
the limits allowed by international regulations (CCIR, FCC or ETSI) and can be
connected directly to the antenna.
The salient features of the
TEX52TFT
are compactness and great ease of use.
Furthermore, the equipment is designed in a modular way: the various functions are
performed by modules connected mostly with male and female connectors or with
flat cables terminated by connectors. This type of design facilitates maintenance
operations and the possible replacement of modules.
The RF power section uses for the
TEX52TFT
an LD-MOS module capable of
delivering up to 50W.
The working frequency is guaranteed by a reference oscillator that is temperature-
compensated and maintained by a PLL (Phase Locked Loop) system. The exciter
reaches the frequency lock in a maximum time of thirty seconds from power on.
The
TEX52TFT
is able to work on the whole frequency band without requiring
calibration and setting operations.
The microprocessor control system includes a TFT touchscreen display on the
front panel and an emergency push-button panel with the following functions:
• Enabling/disabling of the output power.
• Setting the output power level.
• Setting the working frequency.
•
Setting the audio parameters
•
Setting the power output alarm threshold (“Power Good” function).
•
Measurement and display of transmitter operating parameters.
•
Communications with external devices such as programming systems or
telemetry systems via RS232 or I
2
C serial interface.
Five LEDs on the front panel provide the following status indications:
ON
,
LOCK
,
FOLDBACK
,
RF MUTE
and
LOCAL
.
The exciter management firmware is based on a menu system. The user can
navigate between the different submenus using the touchscreen or the four buttons:
ESC
, , , and
ENTER
.
On the rear panel there are the network input connectors, the audio input connectors
and the RF output connector, the telemetry connector, the protection fuses, two
inputs for signals modulated on sub-carriers by special external encoders, normally
used in Europe for RDS (Radio Data System) broadcasting.
