Serving the worldwide community of radio-electronic homebrewers. Providing blog support to the SolderSmoke podcast: http://soldersmoke.com
Podcasting since 2005! Listen to Latest SolderSmoke
Wednesday, August 20, 2025
A Second Aeronautical Mobile Contact with Mike KX4WC/Aeronautical Mobile
Tuesday, August 19, 2025
Coil-Making in Japan -- Manual and Automatic
I found this video sort of soothing. I liked the manual process, but the automatic process is amazing too.
Thanks to Rogier PA1ZZ for sending this.
Thursday, August 7, 2025
SolderSmoke Podcast 261: Travel, AI-Apocalypse, ARRL Award, Amplifiers (with Claude) , Transcoms, Smoke released in DR, QRP, CW, MAILBAG
Opening: Travel notes: Pete to Denver. Dean to Alaska. Bill in the Dominican Republic.
The future of the podcast. We will embrace our NIMCEL status and fight on in spite of the AI Apocalypse. Thanks to Peter VK3TPM, Hamilton KD0FNR, Sam AI7PR, Todd K7TFC and the WayBackMachine for providing backup and transfer options for the blog. Google could end Blogspot at any time.
Dean and Bill win the 2025 ARRL Technical Service Award. Thanks to Bruce KC1FSZ for the nomination. And thanks to Bill Morine N2COP for letting us know. 91 receivers completed so far!
SolderSmoke East was pleased to host Phil W1PJE, a distinguished MIT radio astronomer AND member of the SolderSmoke Direct Conversion Receiver Hall of Fame.
Dean: Amplifier design, woes, triumphs, tribal knowledge. And help from Claude.
Pete: Project X -- The Transcom SBT-3, Crossroads and Decisions.
SHAMELESS COMMERCE DIVISION: FIGHT THE AI-APOCALYPSE -- BECOME A PATREON SPONSOR.
Mailbag:
Who is the Project 326 Guy? A British engineer resident in China for last 20 years.
Steve EI5DD Ham Radio Ireland magazine. Hey -- Why no Irish DC RX builders?
Paul K9ARF -- Thanks for the very kind e-mail about SolderSmoke.
Rogier PA1ZZ -- Many nice videos and suggestions on blog backup.
Grayson KJ7UM on the EF-50 valve (thermatron!)
Bruce KC1FSZ Four DC RX builders at the Wellesley Mass radio club.
Chris KD4PBJ -- Long trip to pick up two directional beacons possibly for 630m or 2200m bands!
Alan W2AEW did a Minimum Discernible Signal test on the DC RX. FB!
Mike WN2A -- Many great comments on MDS in its various forms.
Philippe F6GUH is a FB homebrewer.
Mike EIOCL -- Always great to talk on the air with an old friend.
Walter KA4KXX -- I checked into the Sunrise net! With my HW-101! Thanks Walter.
Farhan VU2ESE -- Watched our interview with Phil W1PJE
Wednesday, August 6, 2025
Antenna Options and Views from the Terrace of SolderSmoke Shack South
CuriousMarc Fixes the HP-182C Power Supply -- But More Fun to Come!
Tuesday, August 5, 2025
Monday, August 4, 2025
ElectroBOOM! CuriousMarc Tries (and fails) to fix an old HP182C Oscilloscope -- Words of Wisdom for all Homebrewers
It will be great to see, in subsequent episodes, how Marc makes it work. It is really great to see someone present an unvarnished view of how troubleshooting really works.
Thanks Marc. 73
Here is Marc's YouTube channel:
FAKE, FRAUDULENT COMPONENTS on Ali Express
Sunday, August 3, 2025
Paul K9ARF -- SolderSmoke and a Knack Story
Bill:
Having been an occasional Solder-Smoke listener, I recently purchased your book "Solder Smoke Adventures" to read during vacation. Previously I limited reading material to technical material, but I retired two years ago and can now allow myself to read stuff just for fun. I devoured your book.
I found you and I to be kindred spirits, seeking to understand the mysteries of electricity and electromagnetic waves as we follow life's path. We're close to the same age, you're a couple years my senior.
My fascination with electronics began as a boy when my Dad and I put together a crystal receiver as a Cub Scout project. I fondly remember my father scrambling up on the roof to string a long wire as an antenna, and then listening to the Cubs ballgame in the earpiece. No batteries required!
I exhibited "knack" tendencies later as an early teen. At a local estate sale I picked up some magazines teaching basic TV repair, and a box of parts that previously was a portable B/W TV. My family was amazed when I resurrected that little TV set.
My career path went into audiovisual interests - I heard broadcast engineers made a lot of money, so I went to Milwaukee Area Tech College electronics communications program. The students there ran UHF channel 36 alongside the professionals running TV channel 10 (both pbs affiliates). On the way to getting your 1st class "phone" license, we learned 2way radio (2nd class). I found that repairing things was far more fun than pushing buttons in Master Control, so I ended up working in 2way.
While attending MATC, I met some guys who were hams - and they invited me to my first-ever hamfest. Wow. A gathering of electronics enthusiasts, many who also have "the knack". I purchased a couple of old books cheap, not knowing this would steer my life in the future: the antenna book and a 1970s radio amateur handbook, both from ARRL. Reading these books, I was intrigued by people who design and build their own equipment - the ultimate in coolness!
I guess what really kept me interested in reading your book is your desire to understand the basic building blocks of electronics - how does it work? This mirrors my personal experience. Though I have formal electronics training, my schooling was aimed mostly at troubleshooting, finding the malfunction. The understanding of why the components in a circuit are the values specified and how they produce the desired output was, like you, a lifelong learning process I still work on today.
My adventure into Amateur Radio was delayed by life activities: marriage, a house, and a child. It didn't help that I never met any hams in rural north Wisconsin. I finally met an amateur who was a VE, and Radio Shack study materials had me on the way in 1990-91.
I tested in early '91 and passed the Novice, Tech, and 5 wpm code - the VE knew that I was a career radio tech, and at his urging I passed the General written test too. My initial call was N9KQX (a horrible cw call). The next months had me work on my code speed and study the Advanced material, and later I became KF9GQ.
At that test session, I sat alongside a gentleman who was taking his 20 wpm code test (wow). A few months later he was one of my interviewers as I applied for a new job - Radio Tech for the Electric & Gas utility in Green Bay. I believe my ham radio hobby helped me land that position, which I held 30 years to retirement.
When the vanity call sign program started, I changed my call to K9ARF "amateur radio fun" (yes, I like dogs...) or "analog radio fan" - life must include a sense of humor.
In my years as a ham, I have done quite a bit of homebrewing, from repeaters and accessories for my station, to test gear and complete transceivers. My proudest projects were building W7ZOI's spectrum analyzer and a multiband KK7B based phasing transceiver using AA0ZZ's DDS synthesizer kits.
I want to thank you and the other solder smoke guys for what you do. Hopefully I will someday have an opportunity to meet you in person to share a cold beverage, laugh and tell stories of molten solder variety. Keep up the good work!!
73 de K9ARF Paul, Green Bay, Wisconsin
Saturday, August 2, 2025
Bill WA5DSS's FB SolderSmoke Direct Conversion Receiver
I forgot to send you a recording. This is what I recorded last night. I did not let it “warm up” so the stability is a little better after awhile. Also, I have a knob for tuning…just haven’t hacked off the head of the bolt yet.
I have put the receiver up for now. I am trying to get a Heathkit DX-60 on the air for New Years Eve Straight Key night. It’s the only time I attempt a straight key. Also I am amazed at how difficult it was to operate these old cw radios. No wonder I didn’t get many contacts back in the early sixties...
Tuesday, July 29, 2025
The Guy with the USB-powered X-Ray Machine -- The Identity of the Project 326 Builder
This morning a comment came in from Hong Kong/Shenzhen that explained who Project 326 is and why he was saying "tubes" and not "valves":
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Thank you for featuring my video. Some background for you, I am a British engineer and have lived in China for over 20 years. I am resident in both Hong Kong and Mainland China (Shenzhen, which is just over the border from Hong Kong). I used the term vacuum tubes as most of the viewers are from the US and us Brits are fully conversant with both terms, but in the US, they are often less 'bilingual' in these kinds of phrases.
Hope that helps!Sunday, July 27, 2025
Joe N90K's FB SolderSmoke Direct Conversion Receiver
Saturday, July 26, 2025
Ham Radio Ireland Magazine available for free download
I was recently talking on 17 meters to my good friend Mike EIOCL. He mentioned that Steve Wright EI5DD had put out new editions of Ham Radio Ireland -- a very FB publication. This morning a message from Steve showed up in one of my e-mail accounts:
Hi,
Here is the link to the latest August 2025 issue of Ham Radio Ireland Magazine, A free publication downloadable from the following link in PDF Format https://docdro.id/Hg8uxRx
Recently we introduced the facility of an Online FlipBook which enables you to turn the pages on Screen.
Here is the link to the FlipBook https://heyzine.com/flip-book/7b84284360.html
Once the link opens there is a box at the top right-hand corner which will enable enlargement and clicking on the Cloud Icon will allow the PDF to be downloaded. There is even a share facility.
If you have enjoyed our magazine, please share on social media or distribute around you club members as this will increase our circulation.
If you are a Secretary of a club do feel free to send us information about your planned activities and we will include them in our news section. It is free publicity.
Steve EI5DD Editor
John EI3HQB Sub Editor
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Check it out! Thanks Steve and John. And thank you Mike!
Friday, July 25, 2025
The Decline in Quality
"Artificial intelligence itself could deteriorate if no action is taken. In 2024, bot activity accounted for almost half of internet traffic. This poses a serious problem: language models are trained with data pulled from the web. When these models begin to be fed with information they themselves have generated, it leads to a so-called “model collapse.” "
https://english.elpais.com/culture/2025-07-20/the-bewildering-phenomenon-of-declining-quality.html
Wednesday, July 23, 2025
The Red-Shifted Neutral Hydrogen Signal from the Cosmic Dark Ages is in the Range of our Direct Conversion Receiver
On the flight to the Dominican Republic I was listening to Fraser Cain's interview with Dr. Christiaan Brinkerink. I was kind of blown away when they started talking about where the neutral Hydrogen signal would be NOW, after the all of the cosmological red shift. Asked this question, Christiaan kind of casually responds that it would be "just above 7 MHz." He talks about this at 41 minutes and 41 seconds in the video above. He points out that this represents a redshift of about 200. Wow, that is just where our SolderSmoke Direct Conversion receivers tune, and where their PTO/VFOs operate. And we thought Radio Marti was a factor to consider! No wonder Christiaan and his colleagues want to go to the far-side of the moon. They want to get above the ionosphere, but they also want to get the shielding provided by the moon to protect them, I suppose, from signals like those being produced by the 40 meter ham band, and, (to a lesser extent) by devices like our little oscillator.
You can watch Fraser's interview with Christiaan above. It is really interesting and inspirational. Christiaan talks about dipole arrays, RFI, interferometers, sensitivity, signals of "several kHz" in width, dynamic range, and other topics known to us. Christiaan is an "Instrument Systems Engineer" at Radboud University. I think he deserves a ham radio license. Maybe he should build a SolderSmoke Direct Conversion receiver. Fraser should build one too.
Here are a couple of links to articles about this:
https://pmc.ncbi.nlm.nih.gov/articles/PMC10961189/
Thank you Fraser and Christiaan.
Monday, July 21, 2025
Fritz's FB SolderSmoke Direct Conversion Receiver
Hi folks! First-time radio builder here, and I've just completed my DCR build! (Pic and video below...)
I have a background in electronics, but mostly audio, digital, video games, tube guitar amps, etc. My only previous experience with radio was a restoration of a small AA5-style radio for a friend. I first saw this project featured on w2aew's site and it seemed too fun not to try. First go with Manhattan construction, too, and I really enjoyed it!
Though I built everything on one board, I did test the modules one by one as I went. I did build and test the audio amp "left to right" instead of the other way around, because I have enough bench gear that I could check as I went without relying on the speaker.
My audio amp build did tend to motorboat turned about half-way up, particularly with no RF input. It was easy to see on the 'scope that the DC power bus was the feedback path. Threw a couple 470uF on there and that pretty well quenched it. In addition to the coil former, I also 3d printed a battery clip and and bracket for the volume pot.
Tuning turned out to be pretty delicate/twitchy, but I am getting better at it. I opted to start with the 28 TPI steel screw after reading some things on the blog. I will probably end up moving some of the windings off the tuning former to try and improve this, and/or investigate a fine tuning option.
I am running right now with a 33' wire out my basement window, up the side of the house, and partway across my flat roof, plus a 16' counterpoise on the basement floor. Will probably get more ambitious with a feedline to a vertical wire in a tall tree in the backyard away from the house this upcoming week.
No license or callsign yet, but I've definitely got the bug with this project, so am reading the materials and hope to take the exam(s) soon!
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Congratulations Frtiz -- Welcome to the Hall of Fame!
Friday, July 18, 2025
Saturday, July 12, 2025
Looking for a Web Person to Create a WordPress Staging/Backup site for this blog.
Please let me know if you can help or if you know someone who can. We will pay. We can discuss this before any work begins.
Thanks. 73 Bill
A USB-powered Homebrew X-ray machine. And who is Project 326?
Friday, July 11, 2025
How many of you guys have changed the clutch on a Heathkit HW-101 (or similar rig)?
Wednesday, July 9, 2025
Oscillation! Negative Resistance! Barkhausen Explained Very Well!
Dan KF5DAN's FB SolderSmoke Direct Conversion Receiver
Tuesday, July 8, 2025
Homebrewing a Quantum Computer
Friday, July 4, 2025
AI Apocalypse: How Google is Changing the Internet-- Implications for SolderSmoke
Here's what happened in a nutshell: During the spring of this year Google rolled out an automatic AI search feature. So now, when you have a question, Google's AI looks at websites across the web and writes up a nice, specific answer to your question. Good for you, but disastrous for those who built blogs and websites on the assumption that Google searches would be sending a lot of people to our sites. Why go to the sites if the nice AI has already given you the answer? Many of us have seen precipitous drops in the numbers of visitors. I have noticed an especially large drop in the number of comments on my blog posts. And I have noticed that many of the other blogs listed on my blog site are no longer posting regularly.
This is not imaginary.
Here is a BBC article on what has happened: https://www.bbc.com/future/article/20250611-ai-mode-is-google-about-to-change-the-internet-forever
Here is TWiT TV talking about it: https://www.youtube.com/watch?v=EDdLw1ubLaY&t=86s
Andreas Speiss (White gloves, Swiss accent, motorcycle hat) talks about the YouTube trends that are causing him to stop regular video production: https://www.youtube.com/watch?v=GTerwIniB24
Leo Sampson talks about the pressure to get high hit numbers on YouTube (scroll forward to the 3 minute 20 second mark): https://www.youtube.com/watch?v=E4tSOQO3kxY
Fraser Cain of Universe Today talks about the Google ""AI apocalypse" (scroll ahead to the 18 minute mark): https://podcasts.apple.com/us/
Monday, June 30, 2025
Will Everett N5OLA -- the Heathkit Guru from South Texas
As a journalist, Will Everett has reported from the Middle East, South Asia and West Africa for National Public Radio, the BBC, Voice of America and other outlets. With Walter Cronkite he wrote and produced the 2006 documentary World War One Living History Project, the only media project to honor the last surviving veterans of WWI. He also collaborated with CNN’s Soledad O’Brien on a program for the National Campaign to Stop Violence.
For ten years he was the creator and host of the syndicated NPR program Theme and Variations. His work has been recognized by the Society for Professional Journalists, the New York Festivals, the National Headliner Awards and the Poynter Institute.
His novel We’ll Live Tomorrow was published in October 2015. He also provided lyrics for a choral collaboration with Joseph Martin, “The Message,” published by Hal Leonard.
Will holds a master's degree from the University of Southern California Annenberg School for Communication and Journalism.
Saturday, June 28, 2025
Alan W2AEW Measures the Minimum Discernible Signal (MDS) of the SolderSmoke Direct Conversion Receiver
Thursday, June 26, 2025
Hack-A-Day on the Tao of Bespoke Electronics
My comment: Good post with good points about the under-appreciated differences between true homebrew and kit building. I have a lot of Heathkits around me, but I never considered them to be homebrew. There is a big difference. We have been promoting and supporting the HOMEBREW construction of 40 meter direct-conversion receivers. No one would confuse these receivers with commercial, or even kit-built gear. But they work very well, and the builder earns the satisfaction that comes with building something from scratch. There are no factory made PC boards to “populate.” All four of our boards are made using Manhattan construction techniques (super glue, isolation pads, copper-clad substrate). Almost 90 receivers have been completed, in more than 15 countries. Check out the receivers. Build one if you dare:
https://soldersmoke.blogspot.com/search/label/DC%20RX%20Hall%20of%20Fame
BTW — I own a Dymo machine, and my SSB transceivers are in wooden boxes made from junked packing material. 73 Bill N2CQR











