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A 300
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.
The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to
change without notice.
Ocotber 2008
Revision D
1
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Summary of Contents for RF A 300
- Page 1 A 300 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 Warranty Electronics & Innovation Ltd., (hereafter E&I) warrants for the period of one year from the date of original delivery, each unit to be free of defects in materials and workmanship. For the period of 12 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 The A300 is a broadband solid state amplifier covering the frequency spectrum from 300 KHz to 35 MHz. It is rated at 300 watts of RF power with low harmonic and intermodulation distortion. Over 400 watts of saturated power can be produced with increased distortion products.
- Page 4 Chapter 2 Operation 2.1 INTRODUCTION The A300 RF amplifier is used to amplify the RF level of signal sources in the 300 KHz to 35 MHz range. No tuning or any other form of adjustment is required. The A300 produces rated power output at its output connector, regardless of load impedance.
- Page 5 Ensure that there is at least 3” or 7.5 cm clearance at the rear of the unit for air flow. (ii) Ensure RF input voltage is not excessive a. The 1 V rms indicated maximum input voltage is 5 times the level of the input signal required to achieve maximum output. Input voltages in excess of 2 volts peak may permanently damage the instrument.
- Page 6 In the event of a fault, the unit may be reset by cycling the power. In the case over an over temp fault, ensure that the air inlet and out let are not restricted. If the fault persists, please contact Field Service. 2.3.3 RS 232 Interface The A300 features a standard RS-232 serial interface suitable for connection to a PC or host system.
- Page 7 The output of the modules is then fed to the combiner to produce a single signal. The power signal is then fed into a length of 50 ohm coaxial cable to the RF bi- directional coupler. The output of the coupler is then fed directly to the N connector on the front panel, this is the unit output.
- Page 8 48 Volt To Page 2 c A075 PA TTL Input A075 PA A300 RF Amplifier A300 – SCH-01 The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to change without notice. Ocotber 2008...
- Page 9 Chapter 4 Maintenance 4.1 INTRODUCTION The E&I A300 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 10 Performance limits quoted are for guidance only and should not be taken for guaranteed performance specifications unless they are also quoted in the Specification Section 1.2. 4.2 PERFORMANCE CHECKS To determine the amplifier’s performance carry out the following procedure. 4.2.1 Initial Check The following check can be made after repair and adjustments or whenever the condition of the unit is in question.
- Page 11 300 kHz and the sweep width to 35 MHz. Disconnect the A300 from the set-up and connect the sweep/generator RF output directly to the 30 dB attenuator. The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to change without notice.
- Page 12 The gain variation should be within the 3 dB as shown on the • oscilloscope. 4.4.2 Measurement of Harmonics Sweep Generator 10 KHz – 35 MHz Power Meter RF Output 30 dB Attenuator 30 dB coupler Spectrum Figure 4-2. 1.) Equipment Required: Sweep/Signal Generator Calorimetric Power Meter HP435B The material contained in this document is the property of Electronics &...
- Page 13 Ensure that the load is connected to the output prior to connecting the RF input to the unit. This will prevent high voltages being present and exposed at the output connector.