ITB ARCHIMEDE 5000 Series, Руководство пользователя

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Archimede 5000 series- FM Power Amplifiers
User’s manual – Page 23 of 65
[59] R.F. signal input (5W)
– coming from the
RF IN connector [19].
[60] R.F. signal output
– connected to the Wilkinson Splitter board.
6.4.b Amplifier circuits
The R.F. signal from the Driver amplifier enters first the Wilkinson splitter (

Par.5.4 - part # [30]) . This circuit splits the R.F. signal
into three or four outputs, according to the model:

Archimede 3000 features a 3-ways Wilkinson splitter.

Archimede 4000 and Archimede 5000 feature a 4-ways Wilkinson splitter.
Each split signal becomes the input of one of the subsequent amplifier modules. The number and type of these modules change
according to the model:

Archimede 3000 is equipped with three 1,300W modules (

Par. 5.4 - parts # [31], [32], [33]).

Archimede 4000 is equipped with four 1,300W modules (

Par. 5.4 - parts # [31], [32], [33], [34]).

Archimede 5000 is equipped with four 1,500W two step modules (

Par. 5.4 - parts # [31], [32], [33], [34]).
The three (or four) amplified signals are then combined in a single one, by means of a Wilkinson combiner (

Par. 5.4 - part # [35]).
The three models mount different combiners:

Archimede 3000 is equipped with 3-ways Wilkinson combiner.

Archimede 4000 is equipped with 4-ways Wilkinson combiner.

Archimede 5000 is equipped with 4-ways Wilkinson two steps combiner.
The output of the combiner is connected to a Low-pass filter (

Par. 5.4 - part # [36]). This circuit, the same for all models, delivers
the signal to the antenna (

RF OUT flange [17]).

Due to the high R.F. powers managed by the Archimede High Power series, these models feature R.F. circuits implemented
using teflon laminated pcb.

The adjustment of the output power is obtained adjusting the amplifier
’s section gain by means of a proper setting. This solution
guarantees a constant high efficiency, even when the user decides to set an output power which is lower than the rated one.

Thanks to the use of over-dimensioned amplifier modules, the Archimede High Power series rated output powers are lower
than the max output power they could deliver. This solution allows a better reliability (note: the maximum output power levels
are factory limited).
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