Eclipse Series RF Technology rfinfo@rftechnology.com.
CONTENTS CONTENTS Contents 1 Operating Instructions 1.2 Front Panel Indicators 3 3 2 Internal Adjustments 3 3 Test Points 4 4 I/O Connections 4 5 Circuit Description 5.1 Driver Stage 5.2 Output Stage 5.3 Low Pass Filter 5.4 Bias Supply 5.5 Reflectometer 5.6 Metering Circuits 5 5 5 5 5 6 6 6 Specifications 6.1 Physical Configuration 6.2 Indicators and Test Points 6.3 Electrical Specifications 6.3.
1 OPERATING INSTRUCTIONS WARNING Changes or modifications not expressly approved by RF Technology could void your authority to operate this equipment. Specifications may vary from those given in this document in accordance with requirements of local authorities. RF Technology equipment is subject to continual improvement and RF Technology reserves the right to change performance and specification without further notice.
3 TEST POINTS 3 Test Points These test points are provided on the PCB and the DB9 front panel connector for use by maintenance personnel TP100 and TP101 Driver drain current measurement. A multimeter placed across these pins will indicate 1 volt for 1 amp of Q102 drain current TP102 and TP103 O/P stage drain current measurement. A multimeter placed across these pins will indicate 1 volt for 10 amps of Q100 and Q101 drain current TP200 PA Temperature reading.
CIRCUIT DESCRIPTION 5 Circuit Description The following descriptions should be read as an aid to understanding the block and schematic diagrams. 5.1 Driver Stage The function of the driver stage is to transform the RF input signal from the exciter to the appropriate levels and impedance required by the output stage. The RF input signal is applied to the high pass filter ( C121, C130, C131, C132, C133, L102 and L106 ).
5 CIRCUIT DESCRIPTION R213, R230 and R208, R215 provide the bias voltage to the transistors so that quiescent current is maintained across the operating temperature range. 5.5 Reflectometer The reflectometer provides an indication of load mismatch. A200 is a current transformer with a single turn primary being passed through the centre of a toroid. The multiturn secondary has an output voltage that is proportional to the current flowing in the primary.
6 SPECIFICATIONS TEMP LED on when the temperature rises above 90 degrees C. Q203 samples the line output RF voltage to turn on the RFO LED. 6 Specifications The PA50 is designed for use with the T50 exciter to provide 20 to 150 Watts output. Output power regulation is performed by the exciter as it continually monitors PA performance. The exciter also monitors important levels such as temperature, reverse power and drain currents to keep them within operating limits. 6.
6 SPECIFICATIONS Nominal Antenna Impedance 50 ohms Output Power 20 to 100 Watts Transmit Duty Cycle 100W Continuous up to 60 degrees C ambient Spurious Emissions less than 0.
