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1140LA
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.
August 2012
Revision F
1
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Summary of Contents for E&I 1140LA
- Page 1 1140LA 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 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 1140LA is a broadband solid state amplifier covering the frequency spectrum from 10 KHz to 2 MHz. It is rated at 1000 watts of RF power with low harmonic and intermodulation distortion. Over 1500 watts of saturated power can be produced with increased distortion products from 100 KHz to 2 MHz.
- Page 4 Table 1-1. SPECIFICATIONS FREQUENCY COVERAGE: 10 kHz to 2 MHz GAIN: 55 dB min, ±1.5 variation CLASS A LINEAR OUTPUT: 1000 Watts 1100W Min. from 10 kHz – 100 KHz; SATURATED RF POWER OUTPUT: 1500W Min. from 100 KHz – 2 MHz INPUT IMPEDANCE 50 ohms, VSWR, 1.5:1 Maximum OUTPUT IMPEDANCE:...
- Page 5 Chapter 2 Operation 2.1 INTRODUCTION The 1140LA RF amplifier is used to amplify the RF level of signal sources in the 10 KHz to 2 MHz range. No tuning or any other form of adjustment is required. The 1140LA produces rated power output at its output connector, regardless of load impedance.
- Page 6 2.3.2 Front Panel Display The 1140LA 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 7 Figure 2.2: Example RS-232 setup using Hyper Terminal In the default state, the RS-232 port will echo the same information sent to the front panel LCD display, allowing a running datalog to be stored to disk using the capture feature of the terminal program. Single character commands can be sent to the amplifier to achieve the following: "1"...
- Page 8 Chapter 3 Technical Description 3.1 GENERAL DESCRIPTION The 1140LA is designed to amplify signals by 55 dB in the frequency band of 10 KHz to 2 MHz. The signal from the front panel N connector is fed via a length of 50 ohm coaxial cable into the input of the splitter module.
- Page 9 To Page 2 b 48 Volt To Page 2 c 2100L PA 2100L PA 1140LA RF Amplifier 1140LA – SCH-01 The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to change without notice. August 2012...
- Page 10 Chapter 4 Maintenance 4.1 INTRODUCTION The E&I 1140LA 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 11 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 12 Set the sweep generator to the video sweep mode with the start frequency at 9 kHz and the sweep width to 2 MHz. Disconnect the 1140LA from the set-up and connect the sweep/generator RF output directly to the 50 dB attenuator.
- Page 13 Return sweep/generator output level to full deflection. Rotate the step attenuator (CCW) so that the output is reduced by 50 dB. Reconnect the 1140LA into the test set-up of Figure 4-1. Place the 1140LA power switch to the "ON" position.
- Page 14 Spectrum Analyzer. Attenuator (30dB) Coupler (30 dB) Connect the Equipment as shown in Figure 4-2, then proceed as follows: Adjust the signal generator to a CW center frequency of 9 kHz, for an indicated output of 1000 watts on the power meter. Using the spectrum analyzer, check that the level of the carrier harmonics is less than -25 dB with respect to the carrier while manually scanning the frequency band of 10 KHz to 2 MHz.
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