TEX150-LCD/S
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User Manual
Rev. 1.0 - 09/07/04
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Measures direct and reflected power by means of directional couplers
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Measures the current absorbed by the power amplifier
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Measures temperature
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Filters the pass low of the output RF signal
This board also features an RF sampling of approximately -30dB RF with respect to
the output, which is available on a BNC connector below the transmitter output
connector. Sampling is useful for verifying the characteristics of the carrier, but not for
checking those of the upper harmonics.
8.5 Telemetry board
This device is designed to inform the user of the condition of machine operation. All
available machine input and output signals are shown on the DB15 connector.
The same board also features the “INTERLOCK” BNC connector for disabling the
device. By grounding the central pin, output power is reduced to zero until the
connection is removed.
When an R.V.R. amplifier is used, this connector is connected to the power amplifier
REMOTE or INTERLOCK by means of a BNC-BNC connector. In case of amplifier
faults, the central conductor is grounded thus forcing the machine to enter stand-by
mode.
8.6 Control board
The main function of this board is to check and correct the MOSFET polarization
voltage of the RF amplifier section.
It also provides the measurement of the absorbed current and contains a circuit for
signaling power supply unit faults.
If no alarms are present, the voltage is adjusted only depending on the set output
power, with a feedback mechanism based on the reading of the power actually
delivered (AGC).
The voltage is also affected by other factors, such as:
- Too much reflected power
- External AGC signals (Ext. AGC FWD, Ext. AGC RFL)
- Too high temperature
- Too much current absorbed my the RF module.