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Fig 1: Circuit diagram of the K9AY 25W, 3.5-30MHz Class A amplifier based on an ultralinear self-biased FE module made by Microwave Technology. For further details see QST, February 1994. The article provides full constructional details and also indicates that kits of components (including circuit boards, heat sink and rotary band switch but not the enclosure, connectors, TR relay or power supplies) are available from Crestone Engineering, PO Box 3702, Littleton, COL 80161 (25W kit $115 $6 shipping). Clearl it is not the cheapest watts per dollar approach but K9AY summarises the case for the module approach: "Thi project shows how new RF products can make home construction of amateur equipment very easy. Home- brew-ers can benefit from a growing trend in RF product engineering: reducing development time by using 'super components' that require few external components and little engineering time to design them into a product. "A secondary purpose is to show how even simple software tools can be used to speed up design. The progra used to design the amplifier's low-pass filters are inexpensive, and accurate at frequencies in the MF/HF bands. In this case, they made it possible to examine trade-offs among standard-value components for seven different filters, without having to build, measure and tweak each one." "The result is a linear power amplifier with good gain and performance. Its uncomplicated design leaves little room for error, and no fancy test equipment is needed to build it successfully. Projects this easy can make an old-timer forget about the 'simpler' days of vacuum tubes!" Sida2 av2 Easy-to-build 25W MF/HF amplifier 2014-09-15 http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/radcom/19...
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