Wiki, Wiki, Waggy http://wiki.waggy.org/dokuwiki/ 2008-09-07T16:01:07-04:00 Wiki, Wiki, Waggy http://wiki.waggy.org/dokuwiki/ http://wiki.waggy.org/dokuwiki/lib/images/favicon.ico text/html 2008-09-05T19:49:10-04:00 David Wagner Gardening SA http://wiki.waggy.org/dokuwiki/gardening?rev=1220658550&do=diff1220658550 Gardening SA --- David Wagner 2008/09/05 16:36 Serious gardening is an attempt to provide for most, if not all of the nutritional needs of a household in a limited area. With only two adult vegetarians to feed, and nearly an acre on which to grow things, this is a reasonable goal. text/html 2008-08-31T19:36:47-04:00 David Wagner Crystal Radio Design http://wiki.waggy.org/dokuwiki/crystal_radio/design?rev=1220225807&do=diff1220225807 --- David Wagner 2008/08/26 18:19 |------------RF------------|-------Audio------| \|/ \ / | || | +--[]--+ | | SP7 | | | | | +--UU--+--UU--+ | | … text/html 2008-08-18T18:21:40-04:00 David Wagner Dakota the Malador http://wiki.waggy.org/dokuwiki/pets/dakota?rev=1219098100&do=diff1219098100 --- David Wagner 2008/08/15 20:06 [Dakota after dinner] [Dakota after dinner again] [Dakota looking goofy.] [Dakota ready to pull the tire] [Dakota pulling] [Dakota makes pulling a tire look easy.] [Dakota stops in the street.] Click on a picture to view a larger image. text/html 2008-08-15T20:46:24-04:00 David Wagner wiki:navigation http://wiki.waggy.org/dokuwiki/wiki/navigation?rev=1218847584&do=diff1218847584 Introduction * Try New Page * Roy the Chow Retriever * Dakota the Malador * Maxwell Site Map ---------- * b.CD * POV-Ray * Economic Analyses * Part Data * Joule Thief * Crystal Radio * Microbial Fuel Cell * Web Development * Dokuwiki Plugin: Format JpGraph text/html 2008-08-15T20:46:05-04:00 David Wagner Roy the Chow Retriever http://wiki.waggy.org/dokuwiki/pets/roy?rev=1218847565&do=diff1218847565 --- David Wagner 2008/08/15 20:45 [Roy in the Backyard] text/html 2008-08-15T20:33:42-04:00 David Wagner Maxwell - created http://wiki.waggy.org/dokuwiki/pets/maxwell?rev=1218846822&do=diff1218846822 --- David Wagner 2008/08/15 20:26 [Maxwell in the backyard.] text/html 2008-07-19T13:34:04-04:00 David Wagner Dokuwiki Introduction http://wiki.waggy.org/dokuwiki/start?rev=1216488844&do=diff1216488844 [Unfortunately due to excessive spambot activity, only registered users can log in and post to this site at present. Apologies.] This software stores its data as text files so it is easier to export it to another format when necessary. The documentation is surprisingly good and available through the Syntax:Dokuwikilink on the left side of every page. text/html 2008-07-18T19:16:21-04:00 David Wagner Tuggle Antenna Tuner http://wiki.waggy.org/dokuwiki/crystal_radio/tuggle_tuner?rev=1216422981&do=diff1216422981 --- David Wagner 2008/04/30 15:09 This page accompanies the online Tuggle Tuner Calculator. [Tuggle Tuner Schematic] Another antenna tuner calculator is also available online. First, combine some components for convenience and determine the variable capacitor’s values as proportional to how much the vanes are meshed. text/html 2008-07-17T18:42:21-04:00 David Wagner Understanding LC Tank Q, Impedance, and Losses http://wiki.waggy.org/dokuwiki/crystal_radio/tank?rev=1216334541&do=diff1216334541 --- David Wagner 2008/04/20 20:05 A resonant inductor-capacitor (LC) tank is the beating heart of a crystal radio, filtering the signal of interest from the sea of radiofrequency (RF) energy received by an antenna. Properly loaded, a high-quality (high-Q) tank will give a crystal radio greater sensitivity and selectivity. text/html 2008-07-14T01:54:32-04:00 David Wagner Tuggle Antenna Tuner - created http://wiki.waggy.org/dokuwiki/crystal_radio/tuggle_tuner.001?rev=1216014872&do=diff1216014872 --- David Wagner 2008/04/30 15:09 This page accompanies the online Tuggle Tuner Calculator. [Tuggle Tuner Schematic] Another antenna tuner calculator is also available online. First, combine some components for convenience and determine the variable capacitor’s values as proportional to how much the vanes are meshed. text/html 2008-07-13T16:24:17-04:00 David Wagner Estimating Unloaded Q - created http://wiki.waggy.org/dokuwiki/crystal_radio/tuggle_tuner.000?rev=1215980657&do=diff1215980657 You can think of the Tuggle antenna tuner as a combined serial and parallel tuner. When tuned to lower frequency, it is more series-like, and when tuned to higher frequencies, it is more parallel-like. The unloaded Q may be estimated by combining the parallel and serial resonant Q values. text/html 2008-07-05T23:16:29-04:00 David Wagner piezo_headphone-notes http://wiki.waggy.org/dokuwiki/piezo_headphone-notes?rev=1215314189&do=diff1215314189 Communications headphones: 300-3000 Hz, centered at 1000 Hz. Low-frequency cutoff is good. 300g cup. ---Loudspeaker and Headphone Handbook, By John Borwick, pg 658. More sensitive magnetic headphones have a narrow frequency response with a low-frequency cutoff of 1.5 to 2 kHz. ---The HZX Headphone Adapter, By Dan Wissell, N1BYT text/html 2008-07-05T14:55:16-04:00 David Wagner Single-tuned Crystal Set http://wiki.waggy.org/dokuwiki/crystal_radio/single-tuned?rev=1215284116&do=diff1215284116 --- David Wagner 2008/06/14 15:29 A single-tuned crystal set is limited by the resistance of the antenna-ground system, but this can be offset by using a large coil (374 μH) and small dual variable capacitor (160/160 pF) in a Tuggle antenna tuner configuration.