Serving the worldwide community of radio-electronic homebrewers. Providing blog support to the SolderSmoke podcast: http://soldersmoke.com
Podcasting since August 2005! Listen to Latest SolderSmoke
Saturday, October 10, 2026
CuriousMarc and Company Fix an Old Analog Device (an Apollo Hand Controller)
Saturday, August 29, 2026
"Solvitur ambulando." Latin for "It is solved by walking."
We've been proponents of this idea for a long time: Essentially it is that sometimes you have to at least temporarily put a hard technical problem on hold. Sometimes you need to just STOP working on the problem, put the rig on the shelf, and go out and take a walk. Or, perhaps, a hike.
In the travel section of the New York Times today, I found this phrase from Latin: "solvitur ambulando." It was in an atricle by one of my favorite authors, Paul Theroux. One of his his novels, "The London Embassy" was eerily true to life, and had me thinking that the house he described was, in fact, the house in London that I was living in. Paul has been at it for so long that, frankly, I thought he was gone. I was delighted to learn that he is not, and that he is still writing books.
Theroux wrote, "Is something fuddled in your mind? Searching for an idea? Then lace your boots, leave the house, and set off alone: Chances are you will find the answer along the way. This remedy (attributed variously to Diogenes the Cynic and St. Augustine) is one that all true piligrims know, and in many respects serious hikers are the modern embodiment of medieval pilgrims."
Indeed, if the solution is fuddled in your mind and you are searching for an idea, take a break, do something different. Take a walk: "solvitur ambulando."
Tuesday, August 18, 2026
SolderSmoke Podcast 266: TROUBLESHOOTING! Test Gear, LA6NCA, ZIA Rig, Australia, Nuvistors, 75 AM, MAILBAG
Video version: https://www.youtube.com/watch?v=_hbLmsFxzx4
Audio version: http://soldersmoke.com/soldersmoke266.mp3
Travelogue: Dean to Boston, Bill to Glenmore in Maryland.
Discussion of AI, data centers, and ham radio.
Dean's Bench:
-- Troubleshooting
-- Why we emphasize building in stages
-- Helge LA6NCA's Rig
-- Troubleshooting when the data fools you: The ZIA rig.
SHAMELESS COMMERCE DIVISION:
-- Mostly DIY RF.
-- Please continue to comment on blog posts.
-- Please think about becoming a Patreon sponsor/
Bill's Bench:
-- Working Australia on 20 and 17 SSB.
-- Putting 80 meter antenna back up. But high (August) noise level on 75. SOLVED!
-- Nuvistor adventures with 1964 Parks Electronics Converter. 6CW4s.
-- Thinking of audio derived S-meters.
Mailbag:
Grayson KJ7UM -- admiration for Helge LA6NCA. 6L6 Rig.
Hidehiko JA9MAT's super regen, And FT-101 VFO Box.
Chuck WB9KZY on older UK covert listening devices.
Paul VK3HN: Australian CBLA rig.
Andri in Bandung, Indonesia -- Built a SolderSmoke DC receiver. 137 built so far!
Mike WN2A liked 3885 kHz post (not everyone did -- AI Slop?)
Walter KA4KXX liked piece on G0UPL breaking the I and Q code of Si5351.
Bob KD4EBM and Peter VK3TPM on AI.
Ryan KJ7KVD will build MMM when family duties permit.
Chris KD4PBJ noted SolderSmoke on a ham radio sign sheet. FB.
Eric 4Z1UG -- Interviewed Will N5OLA (Heathkit Guy) https://www.qsotoday.com/podcasts/n5ola
K6AUS seeking understanding on mixers. FB!
K6AUS: Did Drake make any 2Bs with serial numbers 3000-4000? https://nomadiq.net/blog/post/how-many-drake-2bs-were-ever-made
I am still looking for a Drake 2B for K6AUS.
NT0Z -- Kirk. A big fan. Thanks.
Saturday, August 15, 2026
Fixing up a Nice Old (but not TOO old) Receiver in the UK -- What would you have done? Please comment below.
Crikey! Blimey! The parts are wonky! Then he fixes it and they are all lovely! These are some great descriptive words that you just won't hear in a U.S. workshop. Pity.
I liked the receiver. I had never seen one of these.
The Ultrasonic cleaner was nice. As was the oven.
His repair of the switches was very cool. I like his technique for repairing the many leads that got broken.
When he started unplugging the plugs on the boards, I got nervous. Pull out the cell phone and take some pictures first!
Opening up those old pots was really going the extra mile. I would have just squirted some deoxit in them.
He ended up changing almost all the caps on the AF amplifier board. The Capacitor Police would indeed been annoyed.
Great job. It was fun watching him work. But what would you guys have done differently? Please comment below.
Thanks to Rogier PA1ZZ for sending me this.
Thursday, July 2, 2026
Vintage Audio Restoration: Glue, Fusible Resistors, and Relays
This guy is restoring VINTAGE audio gear. It is definitely younger than the Boatanchors we usually work on, but it is a lot older than more recent gear that is made with largely pick-and-place machines and surface mount components. There are mostly through hole components here.
There are some challenges I've never thought about: glue that over time starts to mess up the circuitry. Fusible resistors? Who knew? And then there are relay contacts that go really bad. We use a lot of these kinds of relays.
All in all, there are a lot of good ideas in this video. His other videos are probably worth watching too. I think it will be especially useful for my friend Bob, KD4EBM who does a lot of work in this area.
Please let me know what you think. Comment below.
Thursday, June 11, 2026
Why It Makes Sense to Take a Break When Stuck on a Problem: "Unleashing Your Creativity" -- Hidden Brain Podcast
Wow. For years we have been telling other builders that when they get stuck on a technical radio problem, when they can't fix a rig or get something to work, they should NOT stick with it, pull their hair out, and bang their heads against the wall. Nor should they do what many of us do in our troubleshooting nightmares: start pulling components off the board until, in the end, the board is empty. No, don't do that. Take a break, take a walk, do some gardening, do something different. Then, when your mind is clear, suddenly the solution will come to you. "Of course," you will think, "R16 should be 10K not 10 ohms!" Or something like that.
But why does that happen, and how does it happen? It seems that many creative people through the centuries have been aware of this phenomenon.
Listen to this podcast. They discuss the benefits of taking a break and clearing your head.
https://www.hiddenbrain.org/podcast/unleashing-your-creativity/
Wednesday, June 10, 2026
Troubleshooting in "2001 -- A Space Odyssey" -- And Trouble with the AI (HAL 9000)
Thursday, April 30, 2026
The Agony of Troubleshooting -- Shielding, Bypassing, Testing, Throwing Things at the Wall
Thursday, October 30, 2025
"Troubleshooting Analog Circuits" by Bob Pease
Get this book: https://www.amazon.com/Troubleshooting-Analog-Circuits-Design-Engineers/dp/0750694998
Wednesday, August 6, 2025
CuriousMarc Fixes the HP-182C Power Supply -- But More Fun to Come!
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:
Monday, January 13, 2025
SolderSmoke Podcast #256: HNY SKN, LA Fires, Barkhausen! Southern Cross, Homebrew vs. Kits, AN762 Kit, Woe, Beacon, ARRL Kids, SDR Build, DC RX videos, Pete Hacked! Power alternatives, KWM4, Mailbag
Fires in LA.
Dean: Breaking the Barkhausen criteria.
Seeing the Southern Cross for the first time in 30 years.
For all three of us: The SolderSmoke Homebrew Challenge. And assembling a kit. https://soldersmoke.blogspot.com/2025/01/some-history-of-homebrew-ham-radio-from.html
https://soldersmoke.blogspot.com/2025/01/the-magic-that-only-comes-from-radio.html
https://soldersmoke.blogspot.com/2025/01/steve-g0fuw-talks-homebrew-and-kits.html
________________________________
Bill's (Southern) Bench:
-- SKN with QCX given to me by Bob. Thanks Bob!
-- Finishing up the AN762 .1kW amplifier. Socketry and relays. Working well.
-- A tale of woe: Some difficult troubleshooting on the 15-10 rig. Intermittent oscillation. Naturally I blamed the TJ DC RX AF amp. Spent a lot of time working on that amplifier. But problem always returned. Started looking at output from carrier osc/BFO. Waveform weird. Then weirdness disappeared and so did the whooping. So I rebuilt the entire carrier osc/BFO/ mixer board. Went back to singly balanced 2 diode mixer. Used LTSpice for the oscillator amp.. No more whooping. Turning the diodes on and off but not quite 7 dbm... Should I be concerned?
-- A 10 meter beacon! 28.233 Please listen. Send e-mail reports. Thanks to WN2A.
-- Antenna thoughts. Getting a tripod.
_______________________________
SHAMELESS COMMERCE! Mostly DIY RF! Lots of useful kits and boards there. I have used their TIA boards. Todd K7TFC is one of us. FB store.
Become a SolderSmoke patron. We need the help. Homebrew is under seige! We are one of the few sites, blogs, podcasts that are promoting it! Help us!
Buy stuff from Amazon and E-bay using the links on our sites.
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Dean's Bench:
-- ARRL kids day -- Exhausting.
-- VWS Makers SDR receiver build.
-- High School DC RX Build news. How to watch the videos.
_______________________________
Pete's Bench:
-- Hacked!
-- Power Alternatives.
-- Thermatron Finals
-- KWM-4.
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Mailbag
Dave Newkirk W9BRD (son of Rod). Great comments on homebrew radio. And a great picture.
Derek N9TD built the DC Receiver. FB Derek!
Peter VK2EMU at 39C in Australia. HOT!
Drew N7DA -- Some great comments on kits vs. homebrew.
Tommy SA2CLC has a nice video about fixing the cavity resonator in his HP8640. Respect!
Ben KC9DLM sent good presentation from India: https://github.com/kholia/talks/blob/master/Dhiru_My_RF_Homebrew_Adventures.pdf
Scott KQ4AOP and Derek N9TD offering to 3D Print PTO coil forms. FB!
Donnie WA9TGT on the beautiful signals from DC receivers.
Chuck KE5HPY's FB Altoids DC receiver.
Todd VE7BPO: POPCORN ELECTRONICS IS BACK! Thanks Todd. And thanks Vasily!
Jim KA4THC has his uBITX on the air and is making contacts!
Farhan VU2ESE fond memories of homebrew dinner with Wes and other HB Heroes (on the blog).
Charlie ZL2CTM -- About his new Pelican Case SSB rig.
Walter KA4KXX. All new hams should build a transmitter.
Buzz W3EMD A nice QSO on 10 and then a shout out to the Old Military Radio Net
Saturday, January 11, 2025
Monday, January 6, 2025
A Tale of Woe -- Troubleshooting my 15-10 Rig in the Dominican Republic
Wednesday, September 18, 2024
Vulnerable MOSFETS in NASA's Europa Clipper
Monday, February 5, 2024
"The Soul of a New Machine" -- Re-reading the Classic Book by Tracy Kidder
This book is especially important to the SolderSmoke community because its title has led to one of the most important concepts in our community and our lexicon: That we put "soul" in our new machines when we build them ourselves, when we make use of parts or circuits given to us by friends, or when we make use of parts (often older parts) in new applications. All of these things (and more) can be seen as adding "soul" to our new machines. With this in mind I pulled my copy of Tracy Kidder's book off my shelf and gave it a second read. Here are my notes:
-- On reading this book a second time, I found it kind of disappointing. This time, the protagonist Tom West does not seem like a great person nor a great leader. He seems to sit in his office, brood a lot, and be quite rude and cold to his subordinate engineers. Also, the book deals with a lot of the ordinary stupid minutia of organizational life: budgets, inter-office rivalry, office supplies, broken air conditioners. This all seemed interesting when I read this as a youngster. But having had bosses like West, and having lived through the boring minutia of organizational life, on re-reading the book I didn't find it interesting or uplifting.
-- The young engineers in the book seem to be easily manipulated by the company: They are cajoled into "signing up" for a dubious project, and to work long (unpaid) hours on a project that the company could cancel at any moment. They weren't promised stock options or raises; they were told that their reward might be the opportunity to do it all again. Oh joy. This may explain why West and Data General decided to hire new engineers straight our of college: only inexperienced youngsters would be foolish enough to do this. At one point someone finds the pay stub of a technician. The techs got paid overtime (the engineers did not), so the techs were making more money than the engineers (the company hid this fact from the engineers). The young engineer who quit probably made the right move.
-- The engineers use the word "kludge" a lot. Kidder picks up this term. (I'm guessing with the computer-land pronunciation that sounds like stooge.) They didn't want to build a kludge. There is one quote from West's office wall that I agree with: "Not everything worth doing is worth doing well." In other words, don't let the perfect be the enemy of the good. Sometimes a kludge will do.
-- Ham radio is mentioned. One of Wests lead subordinates was a ham as a kid. Kidder correctly connects this to the man having had a lonely childhood. Heathkit is also mentioned once, sarcastically.
-- The goal itself seems to be unworthy of all the effort: They are striving to build a 32 bit computer. But 32 bit machines were already on the market. The "New Machine" wasn't really new.
-- Kidder does an admirable job in describing the innards of the computer, but even as early as the 1978 models, I see these machines as being beyond human understanding. The book notes that there is only one engineer on the hardware team who has a grasp of all of the hardware. The software was probably even more inscrutable.
-- I found one thing that seemed to be a foreshadowing of the uBITX. The micro code team on this project maintained a log book of their instructions. They called it the UINSTR. The Micro Instruction Set. Kidder or the Microkids should have used a lower-case u.
-- The troubleshooting stories are interesting. But imagine the difficulties of putting the de-bugging effort in the hands of new college graduates with very little experience. I guess you can learn logic design in school, but troubleshooting and de-bugging seem to require real-world experience. We see this when they find a bug that turns out to be the result of a loose extender card -- a visiting VP jiggled the extender and the bug disappeared.
-- Kidder provides some insightful comments about engineers. For example: "Engineering is not necessarily a drab, drab world, but you do often sense that engineering teams aspire to a drab uniformity." I think we often see this in technical writing. Kidder also talks about the engineer's view of the world: He sees it as being very "binary," with only right or wrong answers to any technical question. He says that engineers seem to believe that any disagreement on technical issues can be resolved by simply finding the correct answer. Once that is found, the previously disagreeing engineers seem to think they should be able to proceed "with no enmity." Of course, in the real world things are not quite so binary.
-- This book won the Pulitzer prize, and there is no doubt about Kidder being a truly great writer, but in retrospect I don't think this is his best book. This may be due to weaknesses and shortcomings of the protagonist. I think that affects the whole book. In later books Kidder's protagonists are much better people, and the books are much better as a result: for example, Dr. Paul Farmer in Kidder's book Mountains Beyond Mountains.
-- Most of us read this book when we were younger. It is worth looking at again, just to see how much your attitudes change with time. It is important to remember that Tracy Kidder wrote this book when he was young -- I wonder how he would see the Data General project now.
-----------------------
Here is a book review from the New York Times in 1981:
https://archive.nytimes.com/www.nytimes.com/books/99/01/03/specials/kidder-soul.html?CachedAug
Here's one about a fellow who also re-read the book and who provides a lot of good links:
https://auxiliarymemory.com/2017/01/06/rereading-the-soul-of-a-new-machine-by-tracy-kidder/
Thursday, January 25, 2024
RIP Arno Penzias -- Co-discoverer of the Big Bang Cosmic Background Radiaton
Monday, October 23, 2023
Bringing a Faulty Herring Aid 5 Receiver Into the Light -- Fixing the AF Amp Schematic Error (video)
Wednesday, October 18, 2023
A Big Error Discovered in the 1976 QST "Herring Aid 5" Article (After 47 Years)

Friday, October 6, 2023
A Pretty Good Troubleshoot -- Fixing the Transmitter in my 75/20 meter Mythbuster Transceiver -- Mind the Gap!
All of a sudden the transmitter in my 75 & 20 meter dual band homebrew Mythbuster transceiver stopped working -- there was no output at all. I went into troubleshooting mode.
The first clue was that the receiver was working fine. This meant that many stages of the rig were taken out of suspicion: It probably wasn't the VFO, the first mixer, the BFO/Carrier Oscillator, the second mixer, or the bandpass filters. Nor was it any of the receive sections in the bidirectional amplifiers I was using.
Suspicion fell on the power amplifiers and on the transmit sections of the bilateral amplifiers.
With the output going to a dummy load, I put the rig into transmit mode and put a bit of audio into the mic jack. Then with the 'scope I started to work my way back from the antenna jack. I wasn't seeing anything. Then I got back to the transmit side of the TIA amplifier between the crystal filter and the mixer. There was a strong signal at the input, but nothing at the output. Bingo! I had found the faulty stage. But where, exactly, had this stage gone wrong?
There are three transistors on each side of a TIA amp (see schematic above) -- I just started from the input of the first one with my scope probe and moved through the circuit. Finally, at the output of the last of the three amplifiers, the signal stopped. I knew I was very close to the problem.
Looking at the components, suddenly I could see the problem: At the output there is a 47 ohm resistor (R2 in the circuit diagram above) and a .1uF cap in series. The cap went to a Manhattan pad. But when I looked at it closely, the lead was kind of floating above the pad. See it?
And when I moved it, the connection between the 47 ohm resistor and its pad seemed quite flimsy.
I quickly replaced both components and was back on the air.
I don't really know how or why the lead to that capacitor broke. Maybe I had bent it repeatedly, to the point of weakness, and, over time, it just let go.
Whatever the cause, I found this to be a satisfying troubleshoot and repair. It required me to think a bit about what could be wrong, and to use some test gear to zero on on the faulty component.




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