2025-06-20T12:37:47Z https://yabu.me Alexander Knochel https://yabu.me/npub1dghqkq4sajpqxu0d959s3fv7ggducmdwuc3cxqpc8vxmx5afvt2qh6gkrs https://media.astrodon.social/accounts/avatars/109/305/225/464/946/153/original/0137b330dfe5bd75.jpg https://media.astrodon.social/accounts/avatars/109/305/225/464/946/153/original/0137b330dfe5bd75.jpg https://yabu.me/nevent1qqsvqxse7wjk7v8taksk8jfy0jrgx7t0evfgnlkr63agjcc34x50k4qzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgpkvt45 Now that&#39;s an amphora I can get behind, literally.<br/><br/>#archaeology <br/>#science<br/> <img src="https://media.astrodon.social/media_attachments/files/114/715/480/304/469/588/original/190b5dff21ec8ffe.jpg"> <br/> 2025-06-20T11:36:57Z https://yabu.me/nevent1qqsxf4g2t28cfpjlqclt75a0ja0e5r6mrhha09hurkwm2kjg6uqq63gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgvh9tc7 In reply to <a href='/nevent1qqs0u9npvj4nfv28ad9jjn8nzm69c7kzt9mnt2q0gzkqyg7uytyj6yc9ac7ru'>nevent1q…c7ru</a><br/>_________________________<br/><br/>Fun fact: if the vertical axis is interpreted as time and the horizontal axis as a spatial direction, this is an actual calculation in relativity theory: the zero stands for the time that passes for a hypothetical observer moving at the speed of light. More precisely, the distance covered by a moving object in minkowski spacetime corresponds to the proper time as measured by a moving observer. <br/>In the extreme case of a thing moving at the speed of light, it will cover as much distance in space as they do in time, exactly as shown in this geometric example, and hence their proper time is zero, i.e. for an observer approaching the speed of light, (almost) no time passes as seen in our rest frame. Light rays or massless particles in general travel on such null geodesics and have no notion of proper time.<br/><br/>However, the calculational trick of making time imaginary to account for relativistic geometry has gone somewhat out of style.<br/>#physics<br/>#math 2025-05-31T18:11:00Z https://yabu.me/nevent1qqs2lhrg4sfy49qepr77y4zk642c4qvrzfem7l3xhgr6sygd2adwwvszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgkrvxed In reply to <a href='/nevent1qqspm890svwndnhuc7q60ml9a8n6ja6f4qm4kjckzj4430qe5zqkfwgyxg6gg'>nevent1q…g6gg</a><br/>_________________________<br/><br/>Ich bin kein Synästhet, ich bin einfach nur alt genug um viele Telefonzellen verwendet zu haben ^^ 2025-04-24T20:47:33Z https://yabu.me/nevent1qqsr6gwfzdylav34098pwsdf6qan87g2ardvdm5vtyl0j0gdnk03fqszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg8tpktg In reply to <a href='/nevent1qqsr3zhmeczyy5lmr692mlk6shfrc9cds6gfhplfy8md02c78r89dycfkgeel'>nevent1q…geel</a><br/>_________________________<br/><br/>ist es komisch dass ich dieses Bild riechen kann? 2025-04-24T20:28:23Z https://yabu.me/nevent1qqs8mhl6xytqh2r6tgsuc8zv4atm3x4hkdxf3plr9cn9hzgfuv4rlrszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgehzrat In reply to <a href='/nevent1qqstevj8sszax9t5y8v2q8c58wfx0rjfjshj7g5sjh7w0fc45cwkhwsjc9vkx'>nevent1q…9vkx</a><br/>_________________________<br/><br/>This is in jest,but I just googled when piano rolls were invented, and it was like 1880 or so ;) 2025-04-07T19:30:49Z https://yabu.me/nevent1qqsqvfjau35lqafssm32jchfeakedx7n76z0qf29ha2j0sdalff8esczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg8cdgsu In reply to <a href='/nevent1qqswd07ek6lk5jgxdmf3laja668vuy8fpgelhntl87ycr9kyuprgh9gz8fn0p'>nevent1q…fn0p</a><br/>_________________________<br/><br/>I love the 60s classics. Especially the 1860s ;-) 2025-04-07T19:23:18Z https://yabu.me/nevent1qqsrwul03f8c9z743vylk8u0pzr57dnn79k76exye82pf5rat40lstgzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgw50w97 In reply to <a href='/nevent1qqsqe45zx9f2a8s5xm93xg72xky8d0jyh3yaaq7j00su6gqd6a3mwzs096995'>nevent1q…6995</a><br/>_________________________<br/><br/>I just had to check and, lol<br/> <img src="https://media.astrodon.social/media_attachments/files/114/297/672/163/448/165/original/755d23b93406d3c6.png"> <br/> 2025-04-07T16:41:18Z https://yabu.me/nevent1qqspnwgjmkadcgkl6gymc89tucr68mku5rkqeevyd63gthgl9y463agzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgdqr4l7 In reply to <a href='/nevent1qqs2k343kdhv7euclrhv9vwnuu6qvlvah5l6atuuhnecpfspnln8cdcmzwruc'>nevent1q…wruc</a><br/>_________________________<br/><br/>I&#39;ll explain in ainute why this indeed precise even if it doesn&#39;t sound so at first 2025-03-23T22:53:57Z https://yabu.me/nevent1qqsp7f0m5rf4gfnw2vjdcej8aa5twzwha37wqmpj47g9hwc9jc9hgcczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgh7zm7l In reply to <a href='/nevent1qqsd02e3vjdj8f55ph6fx48s8vj2wrdmlfyh4mhdtfd978jy54xtkhspvjvpw'>nevent1q…jvpw</a><br/>_________________________<br/><br/>Let me start this way:<br/><br/>I get asked rather often - &#34;what is energy, actually&#34;?<br/><br/>Over the years, I had a variety of different answers which always turned out to be either kind of vague, mysterious at worst, or not very general and unsatisfactory.<br/><br/>Thanks to Noether&#39;s theorem, I can instead give the following very precise statement:<br/><br/>There is a conserved quantity which is associated, via the NT, with the time translation invariance of the fundamental laws of nature. I call this quantity the Energy.<br/><br/>Let&#39;s take this statement apart a bit./<br/>#physics 2025-03-23T22:10:25Z https://yabu.me/nevent1qqsd02e3vjdj8f55ph6fx48s8vj2wrdmlfyh4mhdtfd978jy54xtkhszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dglrqnmw So today is the birthday of Amalie Emmy Noether.<br/><br/>I cannot speak competently about her work in pure mathematics - in other words, the majority of her ground-breaking accomplishments elude me somewhat.<br/><br/>But as a theoretical physicist, I can speak about her contribution to #physics which is so wonderfully deep yet simple. <br/><br/>So this is a short Thread on Noether&#39;s Theorem /<br/> <img src="https://media.astrodon.social/media_attachments/files/114/213/892/573/138/511/original/799a4884c3440e3b.png"> <br/> 2025-03-23T21:39:08Z https://yabu.me/nevent1qqsv7zks004hctr5ga08hy22pd5zzjeq2j860jqanv6cp8uy074p80szyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg9dtydk In reply to <a href='/nevent1qqsfz7qzxdtdvdafmdgf2qxxwuvxp3tpu7a8wfnz7zpnm2m5r89sc3sehrj0r'>nevent1q…rj0r</a><br/>_________________________<br/><br/>Noone ANTicipated that development 2025-03-16T06:12:35Z https://yabu.me/nevent1qqswzhar8ge2g9yusgmrkfel6tg76mg77wfnewmzn60ujusnys2uz4szyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg9hryr2 In reply to <a href='/nevent1qqs0s6hhu7g8sxn8xjglqr47e27ge48q44882p52nsxghk4fr5fphfg4yw9tx'>nevent1q…w9tx</a><br/>_________________________<br/><br/>But in seriousness, how does the biasing work in the output stage? Is it a JFET that self biases? 2025-03-15T21:10:51Z https://yabu.me/nevent1qqs0rpv0jr6k3advdczed7ycmnajxrtjlm629hweht0x36tckytgnhszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgfl849e In reply to <a href='/nevent1qqs0s6hhu7g8sxn8xjglqr47e27ge48q44882p52nsxghk4fr5fphfg4yw9tx'>nevent1q…w9tx</a><br/>_________________________<br/><br/>I hope this wasn&#39;t the amplifier module hrht 2025-03-15T21:04:52Z https://yabu.me/nevent1qqstudhhd2l52a9z4k64jlpz4z8pc5aqvuuuue59kk3tjy5464wq92szyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dglxp36c Using the latest Linux version of wsjt-x with a Xiegu X6100 with digital modes, and it only uses USB sound in for the first transmit cycle, during the next, it takes sound from the hand held mic. I tried a firmware update but it didn&#39;t seem to help. Help, I don&#39;t want to whistle the FT8 myself!<br/><br/>#hamradio 2025-03-10T07:11:18Z https://yabu.me/nevent1qqs9ctpjc5q5u04qry78ce96mptxvs3at0rlp6l8calnna729955s9szyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg7ypz5d Today was one of those physics lessons which completely escalated in a fun and spontaneous way when students demanded (at the end of a long arduous unit on induction and electric/magnetic fields) that they want to &#39;transmit something&#39;<br/><br/>So I took our pedagogical electronics system and let them slam together a meissner oscillator from the students manual, and pimped it to run at 400k instead of 400 ;). <br/>Whatever leaked from that to my SDR we put on the big screen. Supply voltage was modulated by an audio amp in series and voila ;-) a lot of fun was had<br/><br/>Let me emphasize for legal reasons that this is not a transmitter. It is an oscillator whose electric field can be picked up a few meters away.<br/><br/>Audio heard is the received signal decoded in the Airspy software.<br/><br/>#electronics<br/>#hamradio<br/><video controls width="100%" class="max-h-[90vh] bg-neutral-300 dark:bg-zinc-700"><source src="https://media.astrodon.social/media_attachments/files/114/082/702/971/635/574/original/3fa88ada3276465a.mp4"></video><br/> 2025-02-28T17:32:25Z https://yabu.me/nevent1qqstjmt34wmdj33rvu7prlf7c6mu4nmy8hzgdeqgc2lecl06m8zdx0gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgmnmlmh In reply to <a href='/nevent1qqsvfhz64462273l2r9stkxwm47htgkzc2kmyxtlt0y83m45q6yqurcmtll76'>nevent1q…ll76</a><br/>_________________________<br/><br/>Is it an accurate picture to have the language of the people descended from some pre existing lofty high language? That sounds partly backwards somehow 2025-02-09T08:40:53Z https://yabu.me/nevent1qqsyhmv6rc4rxmp5chsax2yl9633p6au6ryfgg6rxhruaczrdegacuczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgp9cxr9 In reply to <a href='/nevent1qqs93g5vmdukvc8krk0yfykc7s7pxu3hjzr78yfe0gm7srgd6zrhgfshgrgda'>nevent1q…rgda</a><br/>_________________________<br/><br/>I&#39;ll be looking forward to the tests! 2025-01-19T17:22:16Z https://yabu.me/nevent1qqs0g9at9qx2mej05rvqaz9w2qyerd7l5hqtrgzqeg92txh7qzcvz9gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgggeq6d In reply to <a href='/nevent1qqsq7jf0gtkjddewfz79ahzrtvp8ldfeageew97jqzd848trl3rnxpc00ae62'>nevent1q…ae62</a><br/>_________________________<br/><br/>A 12 V hair dryer is a bit scary tbh 2025-01-08T17:18:21Z https://yabu.me/nevent1qqsx3jhryqp6kw6ukm0y7k3668w876zjs4thx5qvhs0qmueejld4g3szyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgqgf300 In reply to <a href='/nevent1qqsvkrka6afuqcq73c8c54rqcp7jd59e8aydhvmwdfsl7zu87ynssvqug2td2'>nevent1q…2td2</a><br/>_________________________<br/><br/>Hey, so when do you expect to have a board finished for tests? 2025-01-07T14:12:08Z https://yabu.me/nevent1qqs0g8sll7lp6p5rta5h2jgdwdq8945cq8hu9y8guwydd9fxutryx0gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgddfdyg In reply to <a href='/nevent1qqstl88sva7j6l82ykaswgrfnrxc4lf57nukymu0lmucsnh69zjyndgth7dez'>nevent1q…7dez</a><br/>_________________________<br/><br/>Very nice thanks for sharing your measurements and the video.<br/><br/>I&#39;m still puzzled how this design puts out power to the antenna when one core with open primary provides 25uH of inductance, That&#39;s 1000j Ohms on 40 meters... 2025-01-05T23:01:11Z https://yabu.me/nevent1qqstl88sva7j6l82ykaswgrfnrxc4lf57nukymu0lmucsnh69zjyndgzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg626su4 In reply to <a href='/nevent1qqs9636gtfrd9eddypzxmfggnk0x0tlk97lua5c4plgx954q7sxzu4qwsync4'>nevent1q…ync4</a><br/>_________________________<br/><br/>rewatching the rest now 2025-01-05T22:17:12Z https://yabu.me/nevent1qqsx9sngyak2m9ccs7y4kjeuzqjg5pkyapwysgpk5tlcrzh2zdmpzvgzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgt8jskf In reply to <a href='/nevent1qqs2dgeugqlrz05haezl778vt0s8fdjgd93epe9cs75glrcq5wkclzq46js20'>nevent1q…js20</a><br/>_________________________<br/><br/>out of scientific curiosity apropos the.previoua discussion, can you measure L of one primary half turn with a shorted secondary? 2025-01-05T10:26:23Z https://yabu.me/nevent1qqsxa9g67chhud7mp5fhvdgx5mku8mp46a7r6w3997tkp6hdgy90qjczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgmgrdzp In reply to <a href='/nevent1qqs2hqa97pha5x2hmv7g27c3ed3lerhmndxfenx9pe9rzcxvs6xyutcjck9pd'>nevent1q…k9pd</a><br/>_________________________<br/><br/>Fortunately, one can murder a whole bucket full of those transistors before you get to the price tag of one of those NXP Ldmos things ;) 2025-01-05T09:14:30Z https://yabu.me/nevent1qqs2jmcpccp7fwwjya8jqc4m90mn2u6czgmjr2499kk98nxf2xnrmhszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgnmzdk8 In reply to <a href='/nevent1qqsvqtfyyfdgzrasnmyjax2mfvm0frmu55s2tp77hd739py9w2urjvc2wqyeu'>nevent1q…qyeu</a><br/>_________________________<br/><br/>If you tell me that these constructions as pictured achieve that well, I&#39;ll be happy...<br/> <img src="https://media.astrodon.social/media_attachments/files/113/744/353/795/147/817/original/e12e1e947edd7894.jpg"> <br/> 2024-12-30T23:25:03Z https://yabu.me/nevent1qqsy8nmk886yegar9jpcr8hpxautd6y8fy2mrxrrvv4tymrcne7s0cczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgyvsdjz In reply to <a href='/nevent1qqszfeugdk23fxu3je6fcx45rmutq2u9ezlxgjwv4xdp23zlsqz3q7cfef0ln'>nevent1q…f0ln</a><br/>_________________________<br/><br/>Sorry if my wording was confusing, I meant that if there is no great coupling between the two halves of the output transformer, half of the three windings always act as a large *series inductor* at the output when the corresponding transistor is open. 2024-12-30T22:34:55Z https://yabu.me/nevent1qqst8huz0ydefhwdglcy7lmcw9m9rwvz4hk5xcwpld5mst9e8dez4cczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgjy5q7x In reply to <a href='/nevent1qqsgs4kdqxqfy6lzdc4jmv52j8vmrxe8p5ky9rgudx2ks7f8m4ye8pqxevqxh'>nevent1q…vqxh</a><br/>_________________________<br/><br/>I&#39;m not sure about rail (because I&#39;m talking about the secondary side) but yes when one mosfet is high impedance and coupling between the two eyes of the transformer is not great, one of the secondaries looks like a choke to me, and that seems bad. 2024-12-30T21:52:22Z https://yabu.me/nevent1qqsqrd2rkqvaj4lm5yvd20zh8geqe5xvjhj8vjlalrnca2wvygljt8gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgarrz7x In reply to <a href='/nevent1qqsd2xu45lx4q6ugl9tvcee9kfvnhgukhmpmc53cja5prvamepvrxgcywenle'>nevent1q…enle</a><br/>_________________________<br/><br/>I&#39;m worried about the secondary imductance on that side! 2024-12-30T20:00:01Z https://yabu.me/nevent1qqsp7nh4xhj29t0vrze2rpx0e5l9qukp98z43amjmwewrdq6esqdglczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgjkhgwf I realize there is something absolutely fundamental I don&#39;t understand about those binocular RF amplifier transformers as they are realized in many designs: each transistor often seems to drive only the copper tube in one of the holes (see my &#34;drawing&#34;), while the secondary windings go through both holes. Do we assume that one transistor firing on one side magnetizes both sides? That seems a bit unlikely, and if not, the other, idling side acts like a very large series choke at the output. How is that supposed to produce a proper 50 Ohm output? <br/>To circumvent such lack of understanding, in my amp I let both transistors work a full winding through both holes.<br/>Someone who understands this is very much invited to answer :)<br/><br/>#hamradio<br/><span itemprop="mentions" itemscope itemtype="https://schema.org/Person"><a itemprop="url" href="/npub133kx3vtsccvrn4uxjn85wacm45uqglre8qz7z7tr86p6lhy0whsqmhfazx" class="bg-lavender dark:prose:text-neutral-50 dark:text-neutral-50 dark:bg-garnet px-1"><span>Rasmus "raek" [rɛːkʰ] SA5RJS</span> (<span class="italic">npub133k…fazx</span>)</a></span> <br/><span itemprop="mentions" itemscope itemtype="https://schema.org/Person"><a itemprop="url" href="/npub13waxuwj8pj2ktmc2w3z35jpc8xn3nk9qx7ucnka66s854ahsr56szw8n4z" class="bg-lavender dark:prose:text-neutral-50 dark:text-neutral-50 dark:bg-garnet px-1"><span>Andreas, DJ3EI, he/him</span> (<span class="italic">npub13wa…8n4z</span>)</a></span><br/> <img src="https://media.astrodon.social/media_attachments/files/113/743/167/280/959/264/original/2e5fcb063001716d.png"> <br/> 2024-12-30T18:23:44Z https://yabu.me/nevent1qqszggqx6jq4hq280uz5f9de4lxu84448tpjanmn0v0t85jvvsfg32czyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg7n8xw0 In reply to <a href='/nevent1qqs83wyr02wvd2mjwq5ka9dq5ypql32hsg5yjwsx7k9gxxyvjta4ckc9gpyvl'>nevent1q…pyvl</a><br/>_________________________<br/><br/>I cannot confirm his observation that the IRF530 suffer from thermal runaway at higher supply voltages. I had this problem massively with the 540, but the 530 runs reliably for me w/ 30V and relatively large quiescent currents of &gt;~100mA per side, even FT8 2024-12-30T11:45:49Z https://yabu.me/nevent1qqs2qzgfvvpu5vl97l8gfwcjt302eqt06827eny5pn8dwn0czl6xfkszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgy8zccz In reply to <a href='/nevent1qqsydkk6qdfrts7h5vn7rhfsmy6grhk4gd3z7e9gkdcwa8j78hr6jkcucxcu4'>nevent1q…xcu4</a><br/>_________________________<br/><br/>What is the intended supply voltage for 70W? 2024-12-30T08:52:55Z https://yabu.me/nevent1qqsqvm95g83x7m97qm7uymn4y0w7gs8zafxdu37y7zgs97vqp9p230qzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg28tdc8 In reply to <a href='/nevent1qqswkak7tv739xywqp4eq7tmdzuc0yaar22tcgztz8q23natqyru3zgln4s0l'>nevent1q…4s0l</a><br/>_________________________<br/><br/>I too tied my brain into knots about those impedance ratios. Especially since each transistor only works for roughly half a period, I ended up deciding that i&#39;d ignore the other transistor and simply consider the turns ratio one transistor sees looking at the load (*). But I don&#39;t quite follow how you go from 50 to 0.6, that looks like you take the 1:9 ratio squared again.<br/><br/>(*) except for the drain source capacitance of the idling transistor which is always in parallel as a nuisance 2024-12-30T05:54:52Z https://yabu.me/nevent1qqsvn88rs3rvln9tek922f8ndx9alnfequay59uwwa2pry843pykp2gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgw3wv22 In reply to <a href='/nevent1qqsp03v5ugyhjr4mmlltz4c0366yjjz4khp0kck5fzps9zg05kdj88cc708sn'>nevent1q…08sn</a><br/>_________________________<br/><br/>I believe in axial tilt. I am told he&#39;s the reason for the season ;) 2024-12-21T20:23:16Z https://yabu.me/nevent1qqs0ghjea55f5fgusl6g7xj5x5edv06cd6j9amnemn33xyfn4dv2lrgzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgzmhqz2 In reply to <a href='/nevent1qqsyud6fw7fdfyzm6ahye5v6xkc2et3j4r8wfvdzytx9vsg0tfx3zdc5mm62m'>nevent1q…m62m</a><br/>_________________________<br/><br/>I get it but I didn&#39;t find a silly tongue twister which reflected this fact accurately :) 2024-12-17T20:27:24Z https://yabu.me/nevent1qqsyctjw394dc0cft0cmn3s5ee25q794yv74wtz29g6mv7q2jwsfyuqzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg0wkj2h In reply to <a href='/nevent1qqs25rr2wk6z52dnhe9csdzptj93xnchaz7mnfld38anfcahccz67gq2y98jc'>nevent1q…98jc</a><br/>_________________________<br/><br/>so, are you saying she is not filled with guilt after gifting a machine with quality built for the quilting guild? 2024-12-17T15:21:36Z https://yabu.me/nevent1qqs0rggfuv595yy0u2t6cs2txgsmzgef2fkqr2vz2nd3nhe4r9ty7hczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg0rw94k In reply to <a href='/nevent1qqsqc63rg9f3dl6z2ajpv4uscuu0phqjnsnzujzk4a7dnksmq4mn9tcu7u03h'>nevent1q…u03h</a><br/>_________________________<br/><br/>ever since I&#39;ve seen microwave PCBs I&#39;m convinced it is black magic, pure and simple. 2024-12-17T08:54:27Z https://yabu.me/nevent1qqsweyjk0mdgvnlay3j2wjyet9dka6tg2q606nn2ymtg6fk5kgwg3fgzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgr8ek9q We need a word for that very deep uncanny nausea one feels watching #AI drawn images. You know exactly what I mean, right? 2024-11-28T07:30:49Z https://yabu.me/nevent1qqspvq7udvxez0kqfculgf6gasr33lvx0ch6zy0x7fqqzrrk259382gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg6lm5qn In reply to <a href='/nevent1qqsrkecj3ym0ee4rk5veftm3ru8lwvlvcmf27schqv2quzjczrr954gtqnnvp'>nevent1q…nnvp</a><br/>_________________________<br/><br/>Ticks against Tetanus 2024-11-25T18:09:03Z https://yabu.me/nevent1qqst2eyc8eu7z43l3x0pxyw2cj8awt29dh7sc9r8zkapm80qnnqmcmszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgll0nep In reply to <a href='/nevent1qqsykwjv9qzvv6jlywwvmkkfd00w7f8e3pnv742e9f9j54plwsakr7swn3ejx'>nevent1q…3ejx</a><br/>_________________________<br/><br/>No shit, Like when Captain Picard asks Crusher and Data to save the infected alien planet without violating the prime directive, and they&#39;re like: we&#39;ll simply use the vector and remodulate the genetic matrix of the parasite to align with the species immune response, and he&#39;ll be like, make it so! 2024-11-25T17:18:57Z https://yabu.me/nevent1qqspr5zuuwz0h9mf23e52656fjpt397lrvtflry7dyuj2e469fmhjuszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg9talp7 In reply to <a href='/nevent1qqsq3yknxdj0z09txks3aw0lx7lats8tv8n366eackc0d528kfksngqu8hndy'>nevent1q…hndy</a><br/>_________________________<br/><br/>I either want Brie or Entertainment, not both. This is unacceptable. 2024-10-20T20:59:44Z https://yabu.me/nevent1qqsph4vqsc726g5eure2g65u4vvtcs4evft6ug3869kgcjg0zrs8erczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg5v45vk In reply to <a href='/nevent1qqsyhprn2pm9agnn2ds8s0zpflwzfwa4l4kzcdlp94fcslc4uq2k7yg3h0tvn'>nevent1q…0tvn</a><br/>_________________________<br/><br/>Decades of Nazi documentaries on the Discovery and History channel, but the most important lesson wasn&#39;t learned. 2024-10-19T08:43:14Z https://yabu.me/nevent1qqsrzt2mnkyfpyt3dmr66x090v23mk08t9cgedmy776t7ufnata075szyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dge62407 Good morning!<br/><br/>For everyone running up that hill today, here&#39;s a nice cover by Eivør Pálsdóttir from the Faroese Islands<br/><br/><a href="https://www.youtube.com/watch?v=fA74UHgWblA">https://www.youtube.com/watch?v=fA74UHgWblA</a><br/><br/>#music 2024-10-15T04:27:11Z https://yabu.me/nevent1qqsfchyg40msf0hclpewnxyem0syafemrtsagnfku0j58w2xffnw6xqzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgdeyma3 In reply to <a href='/nevent1qqsz9g89tk96q0jy2u6ftljftzhztnppjy35q6afknjtj459rmv3qss932jd3'>nevent1q…2jd3</a><br/>_________________________<br/><br/>This is me, is there a modern name for it? 2024-10-11T16:51:15Z https://yabu.me/nevent1qqsf7dxfdn8jlfuqn2pmkkrep2esafx8yrtpjgmtkrd28zhynm4ulrczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dga0llht In reply to <a href='/nevent1qqs2zclyukwv8svwqzdpuvqdks0w7dn3z7lugdgr8ww3y9v54vqxk3cr5ddhq'>nevent1q…ddhq</a><br/>_________________________<br/><br/>My problem is that the Micro:Bit serial output does not seem to sink enough current to pull the LoRa Board RX down to 0V. The same module works when driven by a Raspberry Pico (shown on oscilloscope). Does the micro:bit have such a high output impedance, or the Seeed Wio E5 such small pullup resistors? 2024-10-01T11:41:19Z https://yabu.me/nevent1qqs2zclyukwv8svwqzdpuvqdks0w7dn3z7lugdgr8ww3y9v54vqxk3czyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgg09dwr In reply to <a href='/nevent1qqsgt26mxrgky0py7daflfx87auzkzrvnf7x5f7mfxyq5prrmham8zsjhvdj4'>nevent1q…vdj4</a><br/>_________________________<br/><br/>Oh great,debugging, but also with hardware. Thank the maker for RTL SDR so at least I know if and where the LoRa TX TXes<br/><br/>#physics<br/>#electronics<br/>#stem #hamradio<br/> <img src="https://cdn.masto.host/astrodonsocial/media_attachments/files/113/231/904/098/488/546/original/8a19bc6d55fd57f3.jpg"> <br/> 2024-10-01T11:23:19Z https://yabu.me/nevent1qqsgt26mxrgky0py7daflfx87auzkzrvnf7x5f7mfxyq5prrmham8zszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgwuelqg In reply to <a href='/nevent1qqspgq7mlv29vla9tm9z09nh9rehew4ffcgqqqv080vcwd6ynk3vlhqducatm'>nevent1q…catm</a><br/>_________________________<br/><br/>Great success!<br/><br/>Hid all the serial calls and additional initialization, as well as forming the LoRa payload, in blocks<br/>#electronics #hamradio #stem #education<br/> <img src="https://cdn.masto.host/astrodonsocial/media_attachments/files/113/217/444/200/514/909/original/bd66aeac53302c9d.jpg"> <br/> 2024-09-28T22:06:10Z https://yabu.me/nevent1qqspgq7mlv29vla9tm9z09nh9rehew4ffcgqqqv080vcwd6ynk3vlhqzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg3mtxc4 In reply to <a href='/nevent1qqsfqwp5axey7wr9ukqyet7z5ym4l2asj53h59hngzp3e6yq22d2nssgtum5x'>nevent1q…um5x</a><br/>_________________________<br/><br/>A first and second look suggests that the goal is reachable - I&#39;ve already tested the serial send functions in MakeCode, and one can send serial data to the big 0,1,2 pins.<br/>Also, MakeCode allows the definition of custom blocks, so putting the lora send AT command and an int to hex conversion into a single block might be appropriate for our purposes.<br/>#stem #education #electronics #teaching<br/> <img src="https://cdn.masto.host/astrodonsocial/media_attachments/files/113/216/723/892/634/637/original/981d13e398d9738d.png"> <br/> 2024-09-28T19:03:25Z https://yabu.me/nevent1qqsfqwp5axey7wr9ukqyet7z5ym4l2asj53h59hngzp3e6yq22d2nsszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgm8wktf All right. My #stem #teaching challenge for this week is to develop a way how 9th graders can program a BBC Micro:Bit with Block Code to send data via LoRaWAN in a way that is clear and simple enough for the students to do in two days of workshop. <br/><br/>#electronics 2024-09-28T14:56:08Z https://yabu.me/nevent1qqsyk72mck6xy3fj0e4djj962umc0f2c8clnq76wcmngmm9d03mrqxczyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgtlzdyf In reply to <a href='/nevent1qqspwquyyauavawejvu9xeqc3l7zr666ax03l6ejg5jkj079vhx8kes2x6hxj'>nevent1q…6hxj</a><br/>_________________________<br/><br/>Do you know by heart if full speed vara has a multi tone modulation? 2024-09-24T04:24:59Z https://yabu.me/nevent1qqswt2jssfv2expyvuzgvvyj8p03n7w7mwhw0rcaem0kasswmf6gaegzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dglmnlqj In reply to <a href='/nevent1qqsx95g6575gt2jk7ue5gjwwud5pnpg60wjfu3l3qm256udfrp4ay7s7806s7'>nevent1q…06s7</a><br/>_________________________<br/><br/>..--.. 2024-09-23T15:51:44Z https://yabu.me/nevent1qqsvqgqsh3p6l7phlwwauax9hyx6ls2ynd74j6kztxnu6pqrzmjt44gzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgst89zr In reply to <a href='/nevent1qqswwyxg0z3zs6ams625xygz0ggnhunp6fjez069d7l6ldwztdkxr7su3zzgg'>nevent1q…zzgg</a><br/>_________________________<br/><br/>I&#39;m using Vara but I couldn&#39;t tell you if it was using more than one frequency at the same time in principle. That being said, listening to my Vara transmissions, they very much sound like single tone.<br/>There are ostensibly also differences between the free and the paid for version in how it codes, so the full version might use multitone 2024-09-23T13:32:56Z https://yabu.me/nevent1qqstch72adpg9st4nxsm93uye5x2v5426ua57p622j790yrd3gmyddszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgxcy6ap In reply to <a href='/nevent1qqst47ucxu924jqm6w2xf8rfwyev8sehrye8unqnuegtfcf4kzys5rqcqa8ah'>nevent1q…a8ah</a><br/>_________________________<br/><br/>--.- --- .----. ..--.. 2024-09-23T13:29:10Z https://yabu.me/nevent1qqsx5pw8rpdtc5amre7hcvckafcpd9y99pqvrl2m42rterr37rd7kzszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgg7aptk In reply to <a href='/nevent1qqs8ase54g0lvfl8dmepzsj2uzdxneygmj43c4tj47pfexh6nvpvcjsdg7tma'>nevent1q…7tma</a><br/>_________________________<br/><br/>- .- .... .--. .- --. .... - .- .... -... . .----. 2024-09-23T13:02:58Z https://yabu.me/nevent1qqstzh86canlyd2pfnvk4z7pfvvqdmj66r68qwa8xz74464aj5r2y4qzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dg4c4ct4 In reply to <a href='/nevent1qqs0hnln2xc9gzz89pk0yvt8z20jqqzjca0pnn49pv9uj7yefhwxr3c3wlh3u'>nevent1q…lh3u</a><br/>_________________________<br/><br/>--.- .- .--. .-.. .- .----. 2024-09-22T21:47:24Z https://yabu.me/nevent1qqsw85dr4wfzht7lg08kp5m66znsj3jswlsz7r7r76e98adz3gqk5sgzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgesgm4e In reply to <a href='/nevent1qqswgx20nuhm9j23e4f8cgs574yyv9ngzsefku4lz53n2mmu2hetyzqsq8q6t'>nevent1q…8q6t</a><br/>_________________________<br/><br/>CQ on all subspace frequencies 2024-09-22T21:35:49Z https://yabu.me/nevent1qqsdzy8e9ev2mmzwee8xxwz54tj207p0j2t7mhf294dq55akm5seckszyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgkn3qg2 In reply to <a href='/nevent1qqsrepjpvtrnpxee3a6r3qda98fen05fa7f27qm9e06qz9sham7vk3s6l0vky'>nevent1q…0vky</a><br/>_________________________<br/><br/>#Grenzkontrollen<br/> <img src="https://cdn.masto.host/astrodonsocial/media_attachments/files/113/140/524/896/853/468/original/31ff295267822882.jpg"> <br/> 2024-09-15T08:03:29Z https://yabu.me/nevent1qqs09krdz8ay02fl2x2fxdf05k98ejegm2w8zjqplwcvq4gjhjr7jgqzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgkczpy4 In reply to <a href='/nevent1qqs22sqqtx0aa6d9ekm9s0hgpjf0epnaud8net9qd37rpau55pvj5fgaq6eyv'>nevent1q…6eyv</a><br/>_________________________<br/><br/>If you scream in all caps on mastodon, people will just ignore or mute it because there&#39;s enough of that elsewhere 2024-09-01T19:42:18Z https://yabu.me/nevent1qqsfsvgc7kmnelvayv9j0q7ejwxydrdct89pj920ynknmwqqn85la2szyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgwexma0 In reply to <a href='/nevent1qqszr9ph865z68dlxnrnln6khgghdsvav7kg2aqqnk33hp2kyhla3hcmjm3w5'>nevent1q…m3w5</a><br/>_________________________<br/><br/>physical:e 1:1<br/>I checked bog because that would be cool 2024-08-29T11:40:20Z https://yabu.me/nevent1qqs0mlvg2vwvx78cq7rvuu2jgwlu6wt2phquq7ccm7rhfyv075znylgzyp4zuzczkrkgyqm3a5kskz99nepphnrd4mnz8qcq8qasmv6n493dgqccxhv Funny #hamradio scene in Jurassic World: Fallen Kingdom.<br/>Person desperately tries to call the mainland from a remote island, in broad daylight on 80, and complains that all the channels are blocked.<br/> <img src="https://cdn.masto.host/astrodonsocial/media_attachments/files/113/018/419/142/571/810/original/a3fbb0be079fcf33.png"> <br/> 2024-08-24T18:30:45Z