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User Manual
Rev. 1.0 - 18/03/21
TEX302TFT
ELETTRONICA
7. Principles of Operation
There is a schematic view of the modules and connections that make up the
TEX302TFT
in figure 7.1.
MAIN BOARD
LPF +
DIRECT. COUPL.
BIAS
PANEL
TELEMETRY
INTERFACE
POWER SUPPLY
TFT
INPUT
(AUDIO/RDS)
R.F.
OUTPUT
RF MODULES
MAINS
R.F.
1 X R.F.
1 X R.F.
R.F.
SERVICE & V.P.A,
1 X VPA (46VDC)
FWD PWR
RFL PWR
BIAS
FAN
R.F.
Figure 7.1
A brief description of the functions of each module is given below, and the complete
diagrams and layouts of the boards can be found in the “Technical Appendix” Vol.2.
7.1 Panel board
The panel board contains the microcontroller that implements the control and
management software of the device, the display and the other elements needed
to interface with the user.
The board interfaces with the other modules of the device, providing for the
distribution of power supplies, control signals and measurements.
7.2 Motherboard
The main board performs the following functions:
• Processing of audio, MPX and SCA inputs;
• Selection of input impedance
• 15 kHz filtering of the R and L channels
•
Preemphasis
