Transcription of A Broadband HF Amplifier Using Low-Cost
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A Broadband HF Amplifier Using Low-Cost
40 March 1999 MBy Mike Kossor, WA2 EBY1 Notes appear on page ) from 160 through 10 meters. To thebasic Amplifier , I added an RF-sensed TRrelay and a set of low-pass filters designed tosuppress harmonic output and comply withFCC requirements. The Amplifier is built ondouble-sided PC board and requires no tun-ing. Another PC board contains the low-passfilters. Power-supply requirements are 28 Vdc at 5 A, although the Amplifier performswell at V of these amplifiers have been builtand exhibit similar performance. Al has beenusing his Amplifier on each of the HF bands,logging well over 500 contacts in 18 reports indicate a noticeable improve-ment in readability (about two S units on av-erage) over his 5 W rig. No indications of in-stability, CW key clicks or distortion on SSBhave been reported. To make it easy for you toduplicate this project, PC boards and parts kitsare available, all at a cost of about $100!
42 March 1999 by thermal runaway. MOSFETs do not re-quire negative feedback to suppress low-fre-quency gain as is often required with bipolar RF transistors.
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