https://pinboard.in/u:keithpeter/public/ recent bookmarks from keithpeter 2021-12-07T17:20:01+00:00 https://practical.engineering/blog/2021/12/5/why-retaining-walls-collapse keithpeter>"You can get many types of earth to hold a vertical slope temporarily, and it’s done all the time during construction, but over time the internal stresses will cause them to slump and settle into a more stable configuration. For long-term stability, engineers rarely trust anything steeper than 25 degrees. That means any time you want to raise or lower the earth, you need a slope that is twice as wide as it is tall, which can be a problem."<< Trig example. Arctan(0.5) = 26.6 degrees... 'twice as wide as it is tall' is the kind of practical rule of thumb a builder would see and remember. ]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:944eee8fa307/ 2021-11-30T22:15:56+00:00 https://nymag.com/intelligencer/2021/11/david-graeber-dawn-of-everything.html keithpeter> "They weren’t paying taxes, they weren’t calling police, and, rather than relying on hierarchical structures of authority, they were making decisions collectively. The Malagasy didn’t call attention to this state of affairs. They just went about their business, behaving [...] as if they were already free." << I think most people do this. The State only pops into existence when certain boundaries are crossed, and most people can spend most of their lives within the boundaries without causing The State to manifest.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:5e63ef418709/ 2021-11-28T21:50:43+00:00 https://news.virginia.edu/content/when-it-comes-problem-solving-new-uva-study-finds-less-more keithpeter> "We are going to pay you $1 if you can renovate the structure so that it will hold a real masonry brick above the little Lego person’s head without collapsing. There is a pile of other Legos that you can use, but each one is going to cost 10 cents from your bonus. For most people, their first inclination is to grab some extra Legos and add three more bricks under the platform. About 60% of people pursue that solution under normal conditions." << I want to know if I put a lego brick back do I get an extra ten cents; and I want to know what the 40% who didn't add bricks did. If the 40% subtracted bricks and the sample size was less than say 100 people then this is basically a coin toss. >> "Well, for another group, we explicitly mentioned that “removing pieces is free.” This was superfluous information – people in both groups knew it was true when we quizzed them about it – but it brought subtraction to mind more easily. In that group, more people subtracted." << OK, how many more? Note: *adding* a prompt to the experiment...]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:a90e85fc29af/ 2021-11-27T18:31:58+00:00 https://unherd.com/thepost/the-melancholy-decline-of-the-semicolon/ keithpeter> "Lancaster's linguists believe that the end of the semicolon, along with shrinking sentence lengths in novels, is a reflection of a society addicted to social media. The shift, commented Justin Tora of the University of Galway, is part of a "more realistic way" of writing for the modern age." << Non-fiction: "The Moon, and the Condition and Configurations of Its Surface" by Edmund Neison has a sentence that extends to one and a half octavio pages set in wonderful letterpress type with several layers of punctuation (semi-colons, commas, dashes). It is a sentence to tobbogon through, leaning into the turns. ]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:c8c6c419fccf/ 2021-11-20T19:03:34+00:00 https://www.larches-cottage.co.uk/rx_antenna/web_sdr.php keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:159593b7b86d/ 2021-11-19T20:55:50+00:00 https://ethw.org/Oral-History:Lloyd_Espenschied#Overseas_Transmissions keithpeter> "Then we had to do something better than that, so Carty decided that he was going to try to bridge the oceans, just like that. The only tubes we had were these little power tubes of about ten watts each. I supposed we had 100 watts at the most. But the prospect was that we could build bigger tubes, so Arnold and the tube shop got busy to produce bigger and better tubes. Three or four men were dispatched to various places, Paris, Canal Zone, Mill Island, California and Hawaii to do the receiving. The Navy promised to cooperate, to let us install a new powerful transmitter that we were going to build at the foot of the towers at Arlington. John Mills made the arrangements there. Later on, Heising took his tube racks, hundreds of these fifty-watt tubes, down there and tried to make them work in parallel."<< 1915 wireless telephony transmission from Washington to Paris and Hawaii. Receivers would have been navy? Armstrong regens? 60kHz so very long wave, ground wave. >> "I did and found that it had a lot of interference, it was no good. I went and erected my own antenna out in Pearl Harbor, which was then a wilderness, only a power station, an officer's building, and a storage building on the docks. I ran this antenna between a water tank and smokestack, then down into an old carpenter's shop where I did the receiving, thanks to B.W. Kendal's homodyne reception, which was invented then and there. Homodyne reception means that the detecting oscillator was oscillating in unison with the received carrier. It had to be in exact unison, and the control was so exact that I couldn't move my body after setting it properly. I had to stay perfectly still and then receive it." << Direct conversion. I'm assuming audion oscillator and rf and af amplification ]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:f5abc9d132a3/ 2021-11-18T21:57:49+00:00 https://karl-voit.at/2017/09/23/orgmode-as-markup-only/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:6fe5b8a7af00/ 2021-11-14T18:24:02+00:00 https://web.archive.org/web/20081017104636/http://home.btconnect.com/gmb/airequip.htm#TR9 keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:07e17093db57/ 2021-11-12T16:39:04+00:00 http://www.pa3fwm.nl/technotes/tn07.html keithpeter> "A whip has a capacitance of almost 10 pF per meter of length, slightly dependent on it thickness. A circular metal plate has a capacitance of about 0.35 pF per cm diameter (proportional to the diameter, not to the area, as one might expect). I haven't found a formula for a rectangular plate, but the shape should not matter too much, so a typical MiniWhip has about 2 pF of plate capacitance. That capacitance is important, because together with the amplifier input capacitance it forms a capacitive voltage divider. If the plate or whip's capacitance is smaller, less voltage remains when the amplifier is connected." << So should I use a small spike or a square of tin? Research continues]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:95413554c38b/ 2021-11-12T09:10:17+00:00 https://a.skh.am/2021/11/10/org-babel-sympy-latex.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:5b23d28c67fe/ 2021-11-09T20:25:12+00:00 https://simplifier.neocities.org/about.html keithpeter> "Fundamentally, my work here is about creating a stable foundation of technology that is reliable, understandable, and practical for an individual to build for themselves. As of writing this, I believe I have done this on a conceptual level, but I intend to continue this work to the highest level of technology that I can achieve on my own." << Fabricating your own triode and tetrode valves is pretty impressive (access to machine shop and vacuum equipment capable of 10 milliTors helps but even so...). Via brutalistwebsites.com]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:5aa3f214cbd7/ 2021-11-09T11:31:07+00:00 https://lists.gnu.org/archive/html/emacs-devel/2020-09/msg00607.html keithpeter>"However, people actually use Emacs, so a greatly incompatible change in Emacs is as unthinkable as a greatly incompatible change in the New York City subway." "We have to build new lines through the maze of underground pipes and cables." << Via HN in an article about the values of emacs. Modernising an old (software) city is hard work.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:b9804cf3e179/ 2021-11-06T21:04:09+00:00 https://www.aavso.org/antenna-options keithpeter> "A small loop that I have recently been using with good results utilizes two 15 inch-long wood crosspieces that are cut from 3/4 inch square stock. Notches are cut in the center of each piece, 3/4 inch wide and 3/8 inch deep. Vee notches are cut 1/2 inch deep in the end of each piece. The two pieces are then assembled in the form of a cross, using glue for attachment. The frame is then wound with 200 turns of #26 enameled wire. Both ends are terminated at one of the arms. A two terminal tie point is mounted on the arm to serve as a connection point. This loop was resonated to 24.0 kHz for the NAA frequency. Polypropylene capacitors were used to give the loop a high Q. A twisted pair of wires was also connected to the terminal point, along with the capacitors. The value of capacitors to resonate at 24.0 kHz was 1320 pf. This completed loop had a Q of 37 and a half power bandwidth of 650 hertz. This narrow bandwidth helps to reject unwanted signals. Ceramic capacitors from Radio Shack may be used in place of the polypropylene type with a somewhat wider bandwidth." << Corresponds t0 around 34 mH for the inductance of the loop ignoring the stray capacitance (which might be quite large).]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:d2abd7bb4ea6/ 2021-11-05T18:57:30+00:00 http://bit-player.org/2021/does-having-prime-neighbors-make-you-more-composite keithpeter> "...the neighbors of primes have 2 as a divisor, which gives them an immediate head start in the race to accumulate divisors. Twin tweens have a further advantage: All of them (with one exception) are divisible by 3 as well as by 2. Why? Among any three consecutive integers, one of them must be a multiple of 3, and it can’t be either of the primes, so it must be the tween." << Nice bit of simple logic - could almost use this as an investigation for H tier GCSE students...]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:93a743185a80/ 2021-11-05T10:58:27+00:00 https://news.stanford.edu/press-releases/2021/11/03/researchers-findles-eat-expected/ keithpeter> "Phytoplankton are a vital food source for krill, small fish and crustaceans – which are, in turn, consumed by larger animals, including whales, birds and other fish. But whales also help sustain phytoplankton. Through eating krill and then defecating, whales release iron locked within krill back into the water, making that iron available to phytoplankton, which need it to survive." << Loops up and down the food chain.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:d3ee8b16d916/ 2021-11-05T10:48:21+00:00 https://www.tate.org.uk/art/artworks/grimshaw-liverpool-quay-by-moonlight-t00902 keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:41fa8a771748/ 2021-11-04T18:04:04+00:00 https://solar.lowtechmagazine.com/2021/11/fascine-mattresses-basketry-gone-wild.html keithpeter> "The oldest image is a 1676 painting by Matthias Withoos, which illustrates the repair of a dyke. However, there are references to brushwood constructions in hydraulic engineering already in the sixteenth century. Many fascine mattresses remain functional today, centuries after their construction. Willow wood becomes rock-hard underwater and almost doesn’t deteriorate." <<]]> https://pinboard.in/ https://pinboard.in/u:keithpeter/b:98874efab7f3/ 2021-10-28T16:33:46+00:00 https://archive.md/cMMqn#selection-625.136-625.493 keithpeter> "...at San Francisco’s hungry i in the early 1950s, he broke new ground with what was then a radically casual approach to performing — riffing, as if by free association, from the headlines in the folded newspaper he always carried and dressed as the UC Berkeley mathematics graduate student he was at the time, in what would become his trademark V-neck sweater" << Traffic management? Question is did he ever write the thesis? Via NextDraft]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:694cdd869af6/ 2021-10-27T08:45:58+00:00 https://www.thisiscolossal.com/2021/10/jon-larsen-project-stardust/ keithpeter> "Larsen, who works in the geosciences department at the University of Oslo, has been at the forefront of micrometeorite discovery since 2009 when “a shiny black dot suddenly appeared on my white veranda table while I was having strawberries for breakfast.”" << Utter magic. The noticing certainly paid off]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:accb4181189e/ 2021-10-27T08:43:48+00:00 https://www.nutsvolts.com/magazine/article/calculating_current keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:97b1c5f12cf6/ 2021-10-26T10:29:06+00:00 https://www.atlasobscura.com/articles/moorish-cuisine keithpeter> "In tūma (eggplants “Looking Like Ostrich Eggs”), whole peeled and boiled eggplants are arranged vertically in a casserole topped with grated cheese, garlic, olive oil, and chopped walnuts." << I'm thinking of those little aubergines, about 2 inches long and an inch in diameter... >> "the long-lost carrot recipe which calls for boiling the pieces until tender, browning them in olive oil, and simply finishing them with vinegar, garlic, and a sprinkle of caraway seeds" << Nice side dish (carrots cut in half lengthways and halved, so about 3 inches long...]]> food https://pinboard.in/ https://pinboard.in/u:keithpeter/b:e060fe2fb90d/ 2021-10-24T21:15:35+00:00 https://www-radiomuseet-se.translate.goog/medlem/audionen2/nr4_2005/kung.html?_x_tr_sch=http&_x_tr_sl=sv&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=nui,sc keithpeter https://pinboard.in/ https://pinboard.in/u:keithpeter/b:e8d97a61a98f/ 2021-10-24T09:27:51+00:00 https://nshdpi.ca/is/marconi100/marconi1.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:afbf97b1b6ea/ 2021-10-22T10:06:34+00:00 https://spitalfieldslife.com/2021/10/22/alan-deins-east-end-shops-x/ keithpeter> "But I have always loved peeling paint, paint that has been weathered and worn seafront textures, and this was just at the last moment before these buildings were going to be redeveloped, so I photographed the shopfronts because this landscape was not going to last." << Colour documentary of an area before the (inevitable) rent driven redevelopment.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:b60ecbaa6c66/ 2021-10-19T12:19:28+00:00 https://www.rfcafe.com/references/radio-craft/de-forest-navy-january-1947-radio-craft.htm keithpeter> "In April, 1914, the de Forest company wrote to the Navy, stating that it was about to display a new form of receiver at an exhibition sponsored by the Bureau of Standards, and asking that a representative of the Navy Department be present. "This includes the use of the audion as a detector of undamped oscillations," the letter said. This was enough to cause immediate and thorough inspection, and it was found that these receivers fitted exactly the Navy's desire for c.w. reception. It was also said that these receivers "did not include feed-back coils, hence did not violate existing patents." " << Clarke was around at the time and evaluating receiving systems for the navy. He states a paragraph above this that he had seen a coil based feedback system. The de Forest Ultraudion receiving system was an audion that fed back via capacitance (external plus grid-anode I suppose). It replaced the small arc based heterodyne detectors. Amazing for 1914-16 ish period. Clarke is coy about Armstrong probably because of all the patent court cases.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:3147bd692de7/ 2021-10-17T17:32:52+00:00 https://www.hakaimagazine.com/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:0d0fd9cc657e/ 2021-10-17T10:51:57+00:00 https://www.bonappetit.com/trends/article/what-the-irish-ate-before-potatoes keithpeter> "Grains, either as bread or porridge, were the other mainstay of the pre-potato Irish diet, and the most common was the humble oat, usually made into oatcakes and griddled (ovens hadn't really taken off yet). And as was often the case in the more northern parts of Europe, the climate made growing wheat relatively difficult, so it was reserved for the fancier parts of society, and consequently thought of as a real treat." << Active experimentation on griddled oatcake recipes starts now. Alas, without the butter. >> "For veggies, the Irish relied on cabbages, onions, garlic, and parsnips, with some wild herbs and greens spicing up the plate, and on the fruit front, everyone loved wild berries, like blackberries and rowanberries, but only apples were actually grown on purpose." << Seems fine to me, but how to store the vitamin C over the winter? Jams?]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:6ad1dab7e857/ 2021-10-16T19:05:42+00:00 https://www.reed.edu/physics/courses/Physics331.f08/hout.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:34b5b98bf38d/ 2021-10-16T09:37:24+00:00 https://www.lareviewofbooks.org/article/the-decline-and-fall-of-rome-a-dangerous-idea/ keithpeter> "Since Gibbon, historians have “blamed” Rome’s fall on a wide range of causes from degeneracy to lead poisoning, from excessive bureaucracy to Christianity. But in his final chapter, Watts demonstrates the absurd lengths “political commentators” will go to use Rome to buttress their criticism of modern politics and society. If even Rome fell, it can happen again." << The idea of the Fall of Rome used to justify an opinion about the current time. The actual history is economics and military power as usual.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:393473252d0e/ 2021-10-16T09:25:38+00:00 http://plopes.org/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:c55e40687eed/ 2021-10-15T15:27:13+00:00 https://www.antiqueradios.com/forums/viewtopic.php?p=944879#p944879 keithpeter> "My Dad was a Tool maker as a young man and worked for the Mason & Hamlin piano company. He saw opportunity in the growing technology of Radio and decided to set up his own business. With only meager capitol he set up shop in an old barn on the property of the home he rented in Lexington, MA. The exact date I do not recall but it had to be either 1912 or 1913. At first he concentrated on components for radio reception equipment only and did obtain several patents. I can still see him, assisted by Mom, making fixed capacitors from melted paraffin wax and other materials at the kitchen table. The project grew and in time he rented space for a small factory in Cambridge, MA. Here he manufactured crystal sets, two types of telegraph keys, the heavy marble base spark key and a lighter model; oval metal base with a shorting bar. His last product was the old familiar five tube (201-A) hetrodyne, battery operated receivers. The plant was open half day on Saturdays and may Dad would take me with him when he went to work. I had my first indoctrination into Radio watching the men putting together and wiring the Broadcast Band receivers. Also the Plating area of the plant where the key components were chrome plated intrigued me no end. When the 1929 depression hit things went down hill. Unable to collect on outstanding invoices from many of his customers the cash flow ceased. He put a great deal of his personal moneys into an attempt to save the business and keep his 14 employees on the payroll. This went on for a few months and as the situation showed no signs of improving in the near future he accepted the advice from his lawyer and closed the plant." << Knowing when to get out (keep a roof over your head). Radio boom then bust in USA]]> notes radio https://pinboard.in/ https://pinboard.in/u:keithpeter/b:fdc64f3a3a89/ 2021-10-15T09:45:06+00:00 https://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/www/mozilla-firefox/Makefile?rev=1.460&content-type=text/x-cvsweb-markup keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:d6d6c32f59f6/ 2021-10-12T18:38:49+00:00 http://blogs.mhs.ox.ac.uk/innovatingincombat/files/2013/03/ACDavies_wavemeters_Oxford_conference.pdf keithpeter> "‘A tune’ at 400 feet (e.g. 2.5MHz) and ‘B tune’ at 1025 feet (950kHz) were separated sufficiently for such simultaneous operation, and the Admiralty decided to add further ‘tunes’ for their own use, at first with the intention that their wavelengths would be kept secret." << Security through obscurity has a long history. Measuring frequency before frequency meters.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:83896e6df100/ 2021-10-11T19:17:43+00:00 https://studio.ribbonfarm.com/p/remystifying-supply-chains keithpeter> "The supply chain crisis is in some ways more unprecedented than Covid itself, given that containerized supply chains, and the world of distributed, networked, computationally coordinated production they enabled, are only a few decades old." <<]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:d80db796e13d/ 2021-10-11T18:27:48+00:00 http://theradioboard.com/rb/viewtopic.php?f=4&t=5051 keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:aa2f8ecafa79/ 2021-10-10T09:03:27+00:00 https://spitalfieldslife.com/2013/08/06/professor-dick-hobbs-criminologist/ keithpeter> "Once a posh woman who wanted to buy some paint asked, 'Do you work here?' and without missing a step he said, 'Not if I can help it.'" << Dodging and weaving. How people got through.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:c01f91d085ab/ 2021-10-09T17:07:30+00:00 https://www.qsl.net/yo5ofh/doc/calculating%20coils%20for%20hf.htm keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:7263b595f168/ 2021-10-08T09:28:20+00:00 https://spitalfieldslife.com/2021/10/08/a-brief-introduction-to-criminality/ keithpeter> "They were different from the other men who populated my small fifties world. Unlike the ex-servicemen who nervously smoked and drank tea through tense evenings of heavily edited reminiscences in my parents’ home, these market men were relaxed, but wary. Of what, I was not certain. They were very well dressed, in trilby hats and overcoats over dark suits, though they seemed to talk in code, and my grandfather always politely refused the coins that they offered to me." <<]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:dfab57c9d3e1/ 2021-10-07T19:35:13+00:00 http://www.ar88.net/arm4/regeneration/regen_demo_video.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:20b956195ab2/ 2021-10-06T16:29:56+00:00 https://go.pardot.com/webmail/509131/798459210/30c11b6e512945328b98171d5efe329eb217aa0c23b419fe3606348877e5f475 keithpeter> "That’s the essential tension at the heart of the Conservative party. “Levelling up” is a project of the Prime Minister: cutting Universal Credit is a project of the Chancellor's." << Minimum wage £12.50 and rents capped at £150 a week. Then I'll believe the rhetoric. £12.50 per hour is £24K full time with holiday pay, which puts my capped rent at 32% of earnings, just about meeting OECD recommendation of housing cost *maximum* of one third of income.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:8878bfed0d15/ 2021-10-06T08:55:54+00:00 https://lucasfcosta.com/2021/09/20/monte-carlo-forecasts.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:eb30d0160109/ 2021-10-04T15:46:31+00:00 http://earmark.net/gesr/loop/ribbonloop.htm keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:eeafb75ac3f8/ 2021-10-02T09:36:11+00:00 https://www.rtl-sdr.com/reviews-of-the-low-cost-mla-30-wide-band-hf-magnetic-loop-antenna/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:b86fa1e48623/ 2021-10-02T09:19:35+00:00 http://www.kk5jy.net/rx-loop/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:3df16739ce3f/ 2021-10-02T08:31:41+00:00 https://watchesbysjx.com/2016/09/how-japans-thomas-edison-built-the-nations-most-complicated-clock.html keithpeter> "Time is indicated via a pointer fixed on the bezel at 12 o’clock, with the face making one counterclockwise rotation a day to show the time. But because traditional Japanese time is seasonal, the silver discs with numerals for the hours move gradually throughout the year. During spring and summer, the discs indicating daytime spread apart, since days and longer, with the opposite happening during winter. During the summer solstice, the daytime discs are the furthest apart, with the nighttime discs so close as to be almost touching." << Seasonal hours by clockwork: move the markers and use equal time for the hands. The markers change more slowly! Genius. ]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:496e3d60ee5e/ 2021-10-01T21:08:26+00:00 https://www.larches-cottage.co.uk/rx_antenna/loops_rx/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:eb46d731beba/ 2021-10-01T20:44:40+00:00 https://www.qsl.net/m0ayf/active-loop-receiving-antenna.html#The_loop_amplifier_circuit_diagram_is keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:df1b323dabe7/ 2021-10-01T20:18:32+00:00 https://www.pa1m.nl/simple-active-receive-loop/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:6be14911da2a/ 2021-10-01T20:17:14+00:00 https://www.qsl.net/m0ayf/G8CQX-Loop-antenna.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:cc182ed4b7e2/ 2021-10-01T09:18:09+00:00 https://jeremymarkovich.substack.com/p/mick-jagger-charlotte-thirsty-beaver keithpeter> "So yes, it is possible for one of the world’s most recognizable men to walk into a bar in Charlotte and not be recognized. People who live in brick bars should not know Stones." << I actually think that this is perfectly fine. And the same about building the flats round the bar.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:998b6cbc86f6/ 2021-09-25T19:05:34+00:00 https://g3ynh.info/zdocs/magnetics/part_1.html keithpeter 1 then l/D = 1 then l/D < 1. Derives the classic Wheeler correction formula, and various optimised approximations for the Nagoaka coefficient. Heavy use of special functions. Good warning about online coil calculators!]]> notes wireless https://pinboard.in/ https://pinboard.in/u:keithpeter/b:40f7119965db/ 2021-09-25T11:36:36+00:00 https://archive.fo/yFias#selection-761.0-761.429 keithpeter> "Mr Chiesa says that giants were a standard embellishment of faraway places in Norse folklore and, indeed, Galvano cautioned that “no sailor was ever able to know anything for sure about this land or about its features.” The Dominican was scrupulous in citing his sources. Most were literary. But, unusually, he ascribed his description of Marckalada to the oral testimony of “sailors who frequent the seas of Denmark and Norway”." << Fishermen of Bristol were fishing off the Grand Banks around 1100 AD according to Kurlansky's book. ]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:883e4463deef/ 2021-09-25T10:53:40+00:00 https://www.bristolwatch.com/radio/crystal_radio.htm keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:deeb44d7ca1f/ 2021-09-24T15:51:34+00:00 http://web.archive.org/web/20160109155844/http://www.k7qo.net/ keithpeter notes wireless https://pinboard.in/ https://pinboard.in/u:keithpeter/b:a815c36e92db/ 2021-09-19T16:26:32+00:00 https://antiquewireless.org/wp-content/uploads/2013-AWA-Review-Vol-26-compressed.pdf keithpeter> "Although his prime interest was mathematics; Hazeltine also became highly interested in the work of Howard Armstrong. Not only had Armstrong patented the regenerative circuit but he also wrote a paper with possibly the first scientific analysis of how the Audion tube worked." << Genealogies in engineering: Major Armstrong solved problems for the Army in the fields of Flanders and Hazeltine designed a well-regarded maritime receiver for use on ships. the SE-1420, from the relative comfort of NY. The SE standing for - I kid you not - the Navy department's Bureau of Steam Engineering which is where radio contracts were issued and managed. Steampunk or what?]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:53c41a05b4ff/ 2021-09-18T09:37:46+00:00 http://blogs.mhs.ox.ac.uk/innovatingincombat/brian-austin-wartime-wireless-intelligence-and-ewb-gill-world-war-one/ keithpeter> "Every hour, and almost on the hour, those Zeppelins would report their position to the High Seas Fleet under whose command they fell. These regular wireless transmissions were a bonanza of the highest order for the listening British wireless stations with their associated direction-finding facilities. Not only was warning given of an impending attack, several hours before they crossed the British coast, but their positions and courses were plotted as they lumbered on." << Culture of an institution can have unanticipated effects]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:898822698ab4/ 2021-09-15T08:59:25+00:00 https://spitalfieldslife.com/2021/09/15/a-walk-with-suresh-singh-x/ keithpeter> "The librarians always helped me and I could spend hours there. It was a sanctuary from the mayhem outside, a kind of university of the ghetto." << Libraries closing and those that remain may have less staff and be forced to have less of a social inclusion ethos. Internet does not fill the gap. What do we do?]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:032dde5606bf/ 2021-09-14T15:11:14+00:00 https://www.bloomberg.com/news/articles/2021-03-26/goodhart-s-law-rules-the-modern-world-here-are-nine-examples keithpeter> "Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes." << Goodhart is still working!]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:58a04d8224a3/ 2021-09-13T11:50:32+00:00 https://livingstingy.blogspot.com/2011/03/waddington-effect.html keithpeter> "There is always a finite chance that the new part you install will be defective, and as a result, you've removed a perfectly good part and discarded it, in favor of a bad one." << A touch of the Beysian priors? I use a recycled corporate laptop and have never had a problem with hardware with this particular one. It has survived 4 years of corporate use and so probably no 'Friday afternoon' parts close to tolerance.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:5adacf72dcaa/ 2021-09-13T10:33:01+00:00 https://vocal.media/01/hacker-news-disease keithpeter> "The wise man knows he doesn’t know. The fool doesn’t know he doesn’t know." << Atrib Lao Tzu. I'm printing it in 72pt aimed at ME. And trying to get into the mind set of asking questions before volunteering help.]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:22fc3f9838c2/ 2021-09-12T10:14:33+00:00 https://www.johndcook.com/blog/2021/09/11/much-less-than-much-greater-than/ keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:3164f03a7c91/ 2021-09-11T18:45:46+00:00 https://californiahistoricalradio.com/CHRSPix/10LeeMarconiBeacon2008.pdf keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:5b112f97f9af/ 2021-09-02T19:22:18+00:00 https://www.youtube.com/watch?v=o7G5KN0_erI keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:9d307342ee7f/ 2021-09-02T15:55:30+00:00 https://www.susanrigetti.com/physics keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:83ab958e5088/ 2021-08-31T17:43:51+00:00 http://users.erols.com/oldradio/eha1.htm keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:21618ae26774/ 2021-08-30T19:24:19+00:00 http://webcache.googleusercontent.com/search?q=cache:yLAUkRyH1EYJ:www.ucs.mun.ca/~jcraig/marconi.html+&cd=6&hl=en&ct=clnk&gl=uk&client=firefox-b-e keithpeter> "In addressing the Royal Institution, Marconi stated he could hear the Poldhu signals using untuned detectors, but not with a tuned receiver. Marconi attributed this to 'the varying capacity of the aerial wire' as the kite supporting it moved about in the wind." << Dirty spark transmitter and untuned receiver - just about possible ]]> notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:96512b24d684/ 2021-08-30T19:09:59+00:00 https://ewh.ieee.org/reg/7/millennium/radio/radio_differences.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:82e7198cf7ac/ 2021-08-29T16:07:48+00:00 https://archaeologynewsnetwork.blogspot.com/2021/07/neolithic-burials-and-vast-gallic.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:b2ca4e26fe91/ 2021-08-25T08:40:12+00:00 http://www.tamikothiel.com/cm/cm-30th.html keithpeter notes https://pinboard.in/ https://pinboard.in/u:keithpeter/b:185192a2b7e1/ 2021-08-23T09:27:10+00:00 https://64k.space/perhaps-wsl2-should-be-a-wake-up-call.html keithpeter> "[...] you see more and more laptops running things like i3 and dwm than back in 2010 -- and these tools haven't gotten any better in these ten years. The fact that a substantial part of the FOSS community seriously prefers using what is effectively the Windows 1.01 interface with a few more features and anti-aliasing instead of any of the results of nearly a decade of UX-focused work in KDE, Gnome, or Cinnamon is a pretty convincing hint that Linux' whopping marketshare in the desktop space isn't so whopping just because of evil Microsoft's monopoly." << Substantial part? ]]> notes linux https://pinboard.in/ https://pinboard.in/u:keithpeter/b:597eb5e6e293/