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350L
Broadband Power Amplifier
HIGH RF VOLTAGES MAY BE PRESENT AT THE OUTPUT OF THIS UNIT. All
operating personnel should use extreme caution in handling these voltages and be
thoroughly familiar with this manual.
Do not attempt to operate this unit prior to reading this manual.
Warranty
The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to
change without notice.
December 2015
Revision F
1
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Summary of Contents for E&I 350L
- Page 1 350L Broadband Power Amplifier HIGH RF VOLTAGES MAY BE PRESENT AT THE OUTPUT OF THIS UNIT. All operating personnel should use extreme caution in handling these voltages and be thoroughly familiar with this manual. Do not attempt to operate this unit prior to reading this manual.
- Page 2 Electronics & Innovation Ltd., (hereafter E&I) warrants for the period of three years from the date of original delivery, each unit to be free of defects in materials and workmanship. For the period of 36 months E&I will, at its option, repair or replace defective parts so as to render the unit fully operational such that it performs according to the original specifications;...
- Page 3 Chapter 1 Introduction The 350L is a broadband solid state amplifier covering the frequency spectrum from 250 KHz to 150 MHz. It is rated at 50 watts of RF power with low harmonic and intermodulation distortion. Over 100 watts of saturated power can be produced with increased distortion products.
- Page 4 Chapter 2 Operation 2.1 INTRODUCTION The 350L RF amplifier is used to amplify the RF level of signal sources in the 250 KHz to 150 MHz range. No tuning or any other form of adjustment is required. The 350L produces rated power output at its output connector, regardless of load impedance.
- Page 5 2.3.2 Front Panel Display The 350L front panel has a passive LCD display designed for simplicity and ease of use. During initialization, the LCD shows the software revision. After the amplifier is initialized, the LCD indicates Forward Power, Reflected Power, and amplifier status (see figure 2.1).
- Page 6 If the fault persists, please contact Field Service. 2.3.3 RS 232 Interface The 350L features a standard RS-232 serial interface suitable for connection to a PC or host system. The communication protocol is extremely simple to facilitate readback and control with readily available terminal programs such as Hyperterm.
- Page 7 Chapter 3 Technical Description 3.1 GENERAL DESCRIPTION The 350L is designed to amplify signals by 50 dB in the frequency band of 250 KHz to 150 MHz. The signal from the front panel N connector is fed via a length of 50 ohm coaxial cable into the input of the driver amplifier module.
- Page 8 Chapter 4 Maintenance 4.1 INTRODUCTION The E&I 350L RF amplifier requires no periodic maintenance. The instrument is unconditionally stable and is fail-safe under all load conditions. Damage can only be externally caused by the incorrect selection of the AC supply voltage or by an input signal in excess of the specified 1 volt rms equivalent to a power level of 13dBm.
- Page 9 output. Observe the harmonic distortion of the output on a spectrum analyzer. The harmonic components contributed by the amplifier should be better than 20 dB down from the fundamental. If the above items are found to be outside of the specification, check the spectral content of the input signal.
- Page 10 Return sweep/generator output level to full deflection. Rotate the step attenuator (CCW) so that the output is reduced by 50 dB. Reconnect the 350L into the test set-up of Figure 4-1. Place the 350L power switch to the "ON" position.
- Page 11 Calorimetric Power Meter HP434A Spectrum Analyzer. Attenuator (20dB) Attenuator (30dB) Coupler (30 dB) Connect Equipment shown Figure 4-2, then proceed as follows: Adjust the signal generator to a CW center frequency of 250 kHz, for an indicated output of 40 watts on the power meter. Using the spectrum analyzer, check that the level of the carrier harmonics is less than -20 dB with respect to the carrier while manually scanning the frequency band of 250 KHz to 150 MHz.
- Page 12 Appendix A: 350L Rev 1 Block Diagram To Page 3 Volt Gating 4 X Splitter To Page Board Option B - I Input Page 1 The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to change without notice.
- Page 13 350L Rev 1 Block Diagram From Page B - I RF OUT Coupler 4 X Combiner RF Detect To Page 3 j Page 2 The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to change without notice.
- Page 14 350L Rev 1 Block Diagram 10 Amp Line Filter Front Panel LCD SMPS 24 Volt Controller Control To Rear To page 1 a Panel RS232 To page 2 j Fans Page 3 The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to change without notice.
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