Difference between revisions from 2010/10/03 22:04 and 2010/10/03 19:57.I have an [Small Wonder Labs SW-40+|http://smallwonderlabs.com/swl_swp.htm] on the bench, and I am very satisfied already. This project is unbelievably well-documented.
! Links
(Pages like these are the very heartbeat of what makes me love amateur radio.)
* [Elmer101|http://epic.mcmaster.ca/~elmer101/] - Transciever class that uses the SW-40+ as the lab
* [Elaborate Build/Exploration Instructions|http://qsl.net/kf4trd/lessons.htm] - Turns the project from a rote build into a rich lecture series---with funky "What happens if we short from here to here" diversions to help understand the components' roles.
* [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.
* [Component Dictionary(!)|http://epic.mcmaster.ca/~elmer101/sw_dictionary.html]
* [Block Diagram PDF|./ham/sw_40-blockdiagram.pdf]
* [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
* [Reviews|http://www.eham.net/reviews/detail/187]
* [Enhancements|http://mysite.verizon.net/tcminyard/SW40_work.html] - Full 5W, Full 40m/CW range, [RIT|http://www.qsl.net/kf4trd/mods.htm], and Freq display (though I want [audio morse output|http://www.arrl.org/files/file/Technology/tis/info/pdf/8309019.pdf]).
! 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]
* [Tiny Tornado|http://www.indianapolis.net/QRPp-I/tinytornado.html] - Minimalist (Improved PixieII). I ♥.
* [Tiny Tornado|http://www.indianapolis.net/QRPp-I/tinytornado.html] and [K8MAV|http://www.indianapolis.net/QRPp-I/KA8MAV_VFO-TT-40.html] - Minimalist (Improved PixieII). I ♥.