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DIY Transciever
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I have an [SWL+40|http://smallwonderlabs.com/swl_swp.htm] on the bench, and I am very satisfied already. The project has so much documentation it is ...heartwarming. ! Links * [KU4QO's Guide|http://qsl.net/kf4trd/lessons.htm] and [Elmer101|http://epic.mcmaster.ca/~elmer101/] - Pages like these are the very heartbeat of what makes me love amateur radio. * [Reviews|http://www.eham.net/reviews/detail/187] * [Enhancements|http://mysite.verizon.net/tcminyard/SW40_work.html] - Full 5W, Full 40m/CW range, RIT, and Freq display (though I want [audio morse output|http://www.arrl.org/files/file/Technology/tis/info/pdf/8309019.pdf]). * [Schematic PDF|./ham/sw_40-schematic.pdf] - This and the next are extracts from [K6QO's doc|http://www.k7qo.net/oscilloscope.pdf] for easy printing. * [Block Diagram PDF|./ham/sw_40-blockdiagram.pdf] * [Component Dictionary(!)|http://epic.mcmaster.ca/~elmer101/sw_dictionary.html] * [NE612A|./ham/NE612A.pdf] - The mixer chips, "Double-balanced mixer and oscillator" ** [Elmer 101 on NE612|http://engphys.mcmaster.ca/~elmer101/swgilb.html] * [NE5532|./ham/NE5532.pdf] - OpAmp Chip * [2n4401|./ham/2n4401.pdf] - The transistors * [LM78LXX|./file/up/LM78LXX.pdf] - The Voltage Regulator ! Goals * I want to understand as much of it as possible (for debugging, education, and expansion). It's OK if it's big and complicated as long as the design is componentized and well-explained. * CW Only (for now) * Monoband is fine (for now) * N6QE post (on [eHam.net|http://www.eham.net/articles/23116]) ups direct conversion and downs AGC. I like it. ! Honorable mention * This [Norcal SMK-1|http://www.cromwell-intl.com/radio/hfqrp.html] really nails it. I like the built-in keyer addition, too. * The [KK7B Binaural I-Q Receiver|http://www.kangaus.com/Documentation%20files/BIQR/biqr.pdf] looks fascinating (great use of stereo sound). * Also by KK7B: [http://www.kangaus.com/microt2.htm] * Popcorn Direct-Conversion Receiver [page|http://www.qrp.pops.net/popDC.asp], [short demo video|http://www.youtube.com/watch?v=_5Gt15_w7Ds]
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