Archimede 5000 series- FM Power Amplifiers
User’s manual – Page 20 of 65
Analog board
RV1
Max Output Power
adjustment
6.1.a
Power supply unit connections and indications
[41]
Mains voltage input
.
[42]
Power Supply unit status LEDs
.
6.2
Analog & controls board
This board (
Par. 5.3, part # [24]) manages all the equipment protections (Direct, Reflected and Max output R.F. powers) via the
output power loop control and the reflected power loop control. If there is the need to reduce the amplifier gain, to maintain an high
efficiency this board regulates the output power gain loop adjusting, first of all, the MOSFET Drain-Source voltage (the voltage can
be regulated from 48 down to 30V). If this isn
’t sufficient, then the BIAS voltage will be also reduced (please see the bottom note).
On the board there is a trimmer (
RV1
) for the adjustment of the maximum output power level (see the following paragraph for
information on how to locate and adjust this trimmer)
As soon as the equipment is powered, the fans will start turning at the minimum speed. Then, their speed changes according
also to the heatsink temperature.
This board performs all its functions (e.g.: ALC control, output power level management, reflected power max level) in analog
mode, without adopting a microprocessor. This solution guaranties
faster processes, and better efficiency and confidence.
6.2.a
Adjustment of the maximum output Power level
With the equipment working, increase the level of the input R.F. driving
power until the output level reaches the 120% of the rated power (e.g.
6kW with Archimede 5000), measured with a hi-precision power meter.
Now with
RV1
adjust the output power level until the measurement
instrument reading is equal to the rated power (e.g. 5kW for Archimede
5000).
Do not exceed the maximum driving input power given in the
following table:
Maximum Driving Input Power levels
Archimede
3000
Archimede
4000
Archimede 5000
35W
50W
60W
42
41
Summary of Contents for ARCHIMEDE 5000 Series
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