Helios Junior, User’s guide
02/2008
Synoptic of the receiver
2.4.1.
1U Rack
The chosen material is stainless steel so as to offer a warranty against corrosion. The monobloc structure
of the rack enhances rigidity. The rectangular outline of the rounded front panel has an LCD display
protected by an armored glass. The transport handles are mechanically interchangeable and can be
removed with the front panel. The cover is fixed by a set of M3 POZIDRIV screws and is easily
collapsible. The user has access to every module to parameter this equipment.
2.4.2.
Power supply
The power supply is achieved with high efficiency switching power supply.
Its output voltage is set at 28 V and its nominal power is 150 W.
2.4.3.
Main board
The main board includes a synthesizer part with mono pre-emphasis, an amplifier part and a
monitoring/display part.
The principal mission of the main board is to generate the FM carrier to be up for current digital sources.
It receives in Mono/MPX inputs and processes the available audio signals. A process is implemented
before the audio signals are sent to the synthesizer.
On start-up, the synthesizer receives the parameter
"
transmission frequency
"
from the monitoring part.
Once locked, the RF signal is transmitted to the internal amplifier.
2.4.4.
RF amplifier part
It includes a heat sink, a MOS-FET transistor, two directive lines, and control electronics.
The potentiometer (RF POWER) located on the front panel enables adjustment of the amplifiers gain (to
modify output RF power).
Forward power and reflected power are always internally monitored and limited to values non editable by
the user. The objective is to protect the RF amplifier against accidental damage.
2.4.5.
Control / Display part
It includes a microcontroller, ROM*, RAM, NVRAM*, indicators, 3 buttons and a back-lighted LCD display
(2 lines of 16 characters each).
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