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1240L
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.
January 2014
Revision E
1
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Summary of Contents for Electronics & Innovation 1240L
- Page 1 1240L 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 1240L is a broadband solid state amplifier covering the frequency spectrum from 30 KHz to 1 MHz. It is rated at 2000 watts of RF power with low harmonic and intermodulation distortion. Over 2500 watts of saturated power can be produced with increased distortion products from 100 KHz to 1 MHz.
- Page 4 Chapter 2 Operation 2.1 INTRODUCTION The 1240L RF amplifier is used to amplify the RF level of signal sources in the 10 KHz to 1 MHz range to. No tuning or any other form of adjustment is required. The 1240L produces a minimum 2000 watts output at its output connector into 50 Ohms and a minimum of 1,000 watts regardless of load impedance.
- Page 5 2.3.2 Front Panel Display The 1240L 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 1240L 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 1240L is designed to amplify signals by 58 dB in the frequency band of 20 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 pre-amp splitter module.
- Page 8 Splitter 42 Volt To Page 2 b 2100L PA 2100L PA 1240L RF Amplifier 1240L – SCH-01 The material contained in this document is the property of Electronics & Innovation Ltd., it is subject to change without notice. January 2014...
- Page 9 Chapter 4 Maintenance 4.1 INTRODUCTION The E&I 1240L 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 16dBm.
- 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 Set the sweep generator to the video sweep mode with the start frequency at 30 kHz and the sweep width to 1 MHz. Disconnect the 1240L from the set-up and connect the sweep/generator RF output directly to the 50 dB attenuator.
- Page 12 Return sweep/generator output level to full deflection. Rotate the step attenuator (CCW) so that the output is reduced by 50 dB. Reconnect the 1240L into the test set-up of Figure 4-1. Place the 1240L power switch to the "ON" position.
- Page 13 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 30 kHz, for an indicated output of 2000 watts on the power meter. Using the spectrum analyzer, check that the level of the carrier harmonics is less than -10 dB with respect to the carrier while manually scanning the frequency band of 30 KHz to 1 MHz.
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