PTX-LCD
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User Manual
Rev. 2.3 - 18/07/07
RV1
JP5
D2
JP3
JP2
Figure 11-9
11.5.1 Adjustments, settings and indicators
D2
On: PLL unlocked
RV1
bias adjustment
JP2
factory settings - do not change
JP3
factory settings - do not change
JP5
factory settings - do not change
11.6Power Amplifier
Two version of the RF power amplifier are available, 30 and 60/100W.
This section is placed in the central part of the device (Fig. 10-13), is fixed to a
heatsink and contained in a metal box completely shielding it.
The RF signal coming from the PLL/Driver card is first amplified by the pilot stage
(MRF237 working in class C) up to 1.5 W, and then passed to the final stage (MRF315)
that amplifies it to 30W.
In case of 60/100W the RF signal coming from the PLL/Driver card is first amplified
by the pilot stage (2xBFR540 and BLF244), then passed through the final stage
(SD1480) to obtain an amplified power of 60 or 100W.
The amplified signal is filtered by a low-pass filter to reduce the harmonic emissions
below the permitted levels.
A directional coupler inside the final amplifier gives the readings of forward and
reflected power, that are then sent to the power supply section to be controlled.
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