Transcription of Designing and Building Transistor Linear Power Amplifiers
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Designing and Building Transistor Linear Power Amplifiers
20 times (13 dB) more Power , even in a low Power (QRP) contest. One more stage of amplification added to the W amplifier can overcome that 13 dB difference. The 5 to 10 W output level is a common standard for portable radios with many commercially available Power in the AntennaFigure 2 is the block diagram of an experimental single-band 36 dB gain 5 W Linear amplifier that may be easily constructed using whatever output device is available. Two noteworthy dif-ferences between Figure 2 and other commonly published cir-cuits are the use of a resistive attenuator and low-pass filter between the driver and final stage, and the floating ground at the final amplifier device. These two features make it easy to experiment with different final amplifier transistors without mechani-cal headaches or 3 is the schematic of a 7 MHz version of the It was optimized to use common, inexpensive ($ ) switching Power supply transistors.
The schematic is on the gollowing page. 0 2000 4000 600 08000 10,000 12,000 0-10-20-30-40 dB-50-60-70-80-90-100 QS0903-Campbell04 Hz from Carrier F requency 6000 8000 10,000 12,000 Hz from Carrier F 2000 4000-50-100 QS0903-Campbell05
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