Showing posts with label math. Show all posts
Showing posts with label math. Show all posts
Saturday, March 11, 2023
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Blogs and Websites and Groups
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Part Obituaries continued : R.I.P -- dear J310 - Greetings ### I'm working on a common gate RF amp using the ubiquitous RF home brewer's JFET, the J310. I happened to go on DigiKey and Mouser. Here's w...
19 hours ago -
Re: Radio Row explained by Jean Shepard - This is one of his lightning in the shack stories... https://www.youtube.com/watch?v=akyTVNorXQ8 Excelsior!1 day ago
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Soldersmoke Direct Conversion Challenge - revisited - I built the direct conversion receiver described on the Soldersmoke blog a while back but ran in to several problems. The audio chain was very unstable and...
1 day ago -
Five-band HF Linked Dipole [updated January 2025] - An improved build *This antenna was first described in the November-December 2023 Communicator. After a year of using it, I’ve developed some improvements....3 days ago
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Winter Sporadic-E opening on the FM band in the USA - 14th Jan 2025 - While the summer Sporadic-E season from late April to early August is well known, there is also a much smaller Sporadic-E season during the mid-winter. O...
4 days ago -
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NanoVNA-H4 – Surely Smith is better? – #2 - NanoVNA-H4 – Surely Smith is better? discussed a correspondents contention that “surely a Smith chart is superior for antenna system tuning, a universal di...5 days ago
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Charging LiFePO4 batteries from a vehicular electrical system - the problems and a solution. - *Figure 1:* The Renogy RNG-DCC1212-20 - an isolated and current-limited battery charger, intended for use with vehicle electrical systems. *Click on the im...
3 weeks ago -
Finding Your Best Crystal Radio 'DX Diode' (Part 2) - Readers may recall my summertime blog, "*Finding Your Best Crystal Radio ‘DX Diode'*". It described a theoretical method I tried in order to see which o...
4 weeks ago -
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WA2JMG - Episode 524 - Charles “Pete” Corp - WA2JMG Charles “Pete” Corp, WA2JMG, operates simple rigs into wire antennas, using low power. His primary operating mo...2 months ago
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Hollow-State Design, 3rd Edition - Hollow-State Design, 3rd Edition is available from: Lulu Press: tinyurl.com/hollowstatedesign3 eBay: search for “hollow-state design” Electric Radio bookst...3 months ago
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I Finally Bought My Dream Airplane - Aviation has been a love of mine since I was a very little person. Living in Nevada, seeing posters and ads for the Reno Air Races, specifically the Texa...3 months ago
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2000 47pF Caps ... - An unexpectged package arrive in the mail today. Did you ever wonder what 2000 47pF NP0 capacitors look like? Thanks to John, AB2XT I will never run ...
3 months ago -
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New QRP Cluster From OM0ET and OM6APN - By DX EXPLORER DX EXPLORER Paul OM0ET and Peter OM6APN recently launched a new cluster dedicated to QRP operations. Have a look and I hope you will enjoy...1 year ago
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Daylight Again – An all Analog Radio - What’s all this? In 10 seconds, A high performance, 7MHz, 5 watt SSB rig Draws just 24 mA of current 90 dB dynamic range, 80 dB close-in dynamic range 3D ...2 years ago
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New post: A “Walkie-Talkie” SSB transceiver for 14MHz or the higher RF bands - To access this article, please click link: A “Walkie-Talkie” SSB transceiver for 14MHz or higher rf bands2 years ago
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Other Electronic Projects • Re: Can I normalize both Mono Amp Outputs? - radm49 wrote: ↑ Mon Apr 25, 2022 3:56 am qmavam wrote: ↑ Thu Apr 21, 2022 8:57 pm Yes, you can use a wall wart for power, you might need to add a capacit...2 years ago
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Digi-chirp! Digital synthesis of ‘nostalgic’ CW - The bottom ends of 80, 40 and 20m are not what they used to be. For starters, the busiest part is the digital segment where computers talk to computers – l...3 years ago
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SMA Torque Wrench for the NanoVNA (uncalibrated) - I have been using SMA connectors on most of my projects, and have occasionaly gotten a slightly different reading than I had expected. Using the NanoVNA, ...
4 years ago -
40m SSB Tramping Rig - Please see my YouTube channel for details of the build. http://www.youtube.com/c/CharlieMorrisZL2CTM *2N3904 Antenna Amplifier (initial)* Voltage gain is ...
5 years ago -
Modifications to the Dayton/FDIM-2019 Antuino - The Dayton Antuino has sub-optimal performance. This is a short note on improving it to an 80 db range of measurements. The trouble with Antuino 2.0 (the o...5 years ago
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Raduino as NBFM TX - Here is a neat, 30 minute hack for your Raduino to turn the Si5351 into a pretty stable, solid NBFM transmitter. The hack is to add a varactor diode in ...
7 years ago -
QRP Labs shop! - [image: Shop] All QRP Labs kits may be ordered online securely at the shop, with PayPal payment. *Click here to visit the shop!* *Click!* *Shop! Order...9 years ago
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Courtesy Of F5VJD – A Working G4JST/G3WPO DSB80 80M DSB Transceiver! - As I’ve explained in earlier posts, my interest in the G4JST/G3WPO DSB80 rig goes back a long way – back to the mid 1980’s in England when I read the descr...12 years ago
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Hans Summers Homebrew Radio, Electronics and Computing - Radio, Electronics and Computing Projects by Hans Summers I make no claims for technical accuracy, good design, or necessarily even originality for the co...15 years ago
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E. Howard Armstrong on a Czech Stamp
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Radio Inventor Stamps
On Page 39 of the Nov-Dec 2024 SARC newsletter "The Communicator"