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2500L
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 D
1
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Summary of Contents for E&I 2500L
- Page 1 2500L 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 2500L is a broadband solid state amplifier covering the frequency spectrum from 50 KHz to 12 MHz. It is rated at 500 watts of RF power with low harmonic and intermodulation distortion. Over 800 watts of saturated power can be produced with increased distortion products from 100 KHz to 12 MHz.
- Page 4 Chapter 2 Operation 2.1 INTRODUCTION The 2500L RF amplifier is used to amplify the RF level of signal sources in the 50KHz to 12 MHz range. No tuning or any other form of adjustment is required. The 2500L produces rated power output at its output connector, regardless of load impedance.
- Page 5 2.3.2 Front Panel Display The 2500L 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 2500L 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 2500L is designed to amplify signals by 60 dB in the frequency band of 26 KHz to 12 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 2500L RF Amplifier 2500L – 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 9 Chapter 4 Maintenance 4.1 INTRODUCTION The E&I 2500L 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 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. Connect AC power supply. Switch on power and observe that the display initializes.
- Page 11 Set the sweep generator to the video sweep mode with the start frequency at 30 kHz and the sweep width to 12 MHz. Disconnect the 2500L 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 2500L into the test set-up of Figure 4-1. Place the 2500L 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 50 kHz, for an indicated output of 500 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 50 KHz to 12 MHz.