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HC2
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User Manual
Rev. 1.1L - 07/07/03
4. General Desciption
The HC2, produced by R.V.R. Elettronica, is a hybrid coupler for FM audio
broadcasting realized in "Strip-Lines" technology. Its function is to split into two
portions the RF signal coming from a RF exciter, adjusting the relative phases, to
pass them through two external RF power amplifiers and then to combine the
output of the amplifiers into a single RF amplified signal to be forwarded to the
antenna output.
The HC2 is produced in two variants:
•
HC2/1 For transmitters with 500 W + 500 W max output power (total 1 kW)
•
HC2/2 For transmitters with 1 kW + 1 kW max output power (total 2 kW)
The variants are different essentially in the kind of used RF connectors and for the
software configurations, that have to cope with different nominal RF power levels.
Exciter
HC2
RF
Amplifier
Spl
Σ
RF
Amplifier
The nominal working principle of a FM transmitter based on a hybrid coupler
scheme (like HC2) foresees that the used amplifiers shall produce the same RF
power that will be added with the same phase. Possible differences in the power
level or phase of the amplifiers generate the so-called unbalancement power that
is in part dissipated inside the coupler. The HC2 guarantees the overall working of
the transmitter even if one of the amplifiers is completely off-service. In such case,
approximately half of the power generated by the surviving amplifier is routed to
the antenna anyway; the other part of the delivered power (that is unbalancement
power) is dissipated inside the combiner.
The HC2 is controlled by a microcontroller system, that includes a LCD display
and a series of keys for the interaction with the user, that realizes the following
functions:
•
Measurement and visualization of the coupler’s working parameters
•
Activation and deactivation of the power output of the system
•
Protection of the coupler with respect to potentially dangerous situations like
exceeding emitted or unbalancement power, overdrive or overtemperature
Summary of Contents for HC2 LCD
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