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Thursday, September 11, 2025
Puerto Rico -- Dominican Republic Tropo on 99.5 FM? Yes, probably
Wednesday, September 10, 2025
Puerto Rico FM Broadcast Station Heard in the Dominican Republic -- But How? WIDI 99.5 FM
WIDI 99.5 FM. Booming in during daylight here on the eastern tip of the Dominican Republic. Their antenna is about 2100 feet above average surrounding terrain. That would put the horizon at about 56 miles. But the path is about 100 miles. What do you folks think is the likely propagation mode?
https://en.wikipedia.org/wiki/WIDI
Saturday, September 6, 2025
Chris KN4GAH's 100th! SolderSmoke Direct Conversion Receiver
Wednesday, September 3, 2025
Chris KD4PBJ's FB SolderSmoke Direct Conversion Receiver
Good Morning guys!
I spent my July 4 weekend and 1200 round trip miles heading up to Richmond to pick up two 50 watt decommissioned airport non directional beacons that I hope to get working on either the 630m or 2200m bands. I'll most likely just use the amplifier, power supply and matching sections as they are modulated CW which isn't permitted.
At least I have a nice high current power supply, outdoor enclosure and inner workings. I was told one worked and one doesn't.
I got them off eBay and the seller is a television engineer in Richmond named Greg. He listens to Soldersmoke too and is a builder like I am.
He said these are government surplus from a place called Camp Peary in VA.
The DC receiver is still coming along, I've just been overwhelmed with things on my to do list as well as a new job (learning lots about high power lasers) so I promise it will get done soon.
Chris
Here are a couple of pictures of Chris's receiver. Thanks Chris, and Welcome to the Hall of Fame.
Tuesday, September 2, 2025
Dave K5YFO's FB Texas SolderSmoke Direct Conversion Receiver
After many diversions from the work bench I finally got the Solder Smoke Challenge Receiver to operate. There were the usual problems with the audio amp but my main problem was a faulty trimmer in the BP filter.
I hope I’m in the first 100 to complete the project.
Hopefully the attached videos make it. One is a CW and the other is SSB.
73 de Dave K5YFO
Monday, September 1, 2025
Robert Sutton's Amazing SolderSmoke Direct Conversion Receiver
Sunday, August 31, 2025
Hall of Fame Update: 95 Completed SolderSmoke Direct Conversion Receivers, and 7 Honorable Mentions. Total: 102 receivers as of September 19, 2025 0849Z. More receivers are being built.
Please let us know if you spot any errors, or if we have inadvertently missed anyone. Don't worry about being late to the game -- the challenge continues. All of the info is still available (see below).
For more information on how you too can build the receiver:
Join the discussion - SolderSmoke Discord Server:
Documentation on Hackaday:
https://hackaday.io/project/
SolderSmoke YouTube channel:
Bob K2BVR's FB SolderSmoke Direct Conversion Receiver
I wanted to send you a quick note of thanks. I’m very grateful to the SolderSmoke Discord users for their help, and to you and KK4DAS for all of the work you’ve both done in developing this project and sharing it through your videos.
I’ve been making progress on my build and thought I’d share a little update. I ran into some challenges with the bandpass filter – it turns out that reducing the trifilar winds per inch helped improve the performance. I also fought with a shorted test fixture along the way, which made things more confusing than they should have been.
On the audio side, my first amplifier module is still giving me trouble. I hated not getting it fixed right away, but I’ll be coming back to it. I did have to add a 470uF cap to the power rail to control oscillation but I haven't added the 220 ohm resistor. I’m thinking about putting the different modules into their own boxes so that I can experiment with them more easily in the future.
Thanks again for all of the inspiration and guidance — I really appreciate it.
73s
K2BVR
Tobias KK7BCO's FB SolderSmoke Direct Conversion Receiver
Friday, August 29, 2025
Shane G0JNR's FB SolderSmoke Direct Conversion Receiver -- With a Glow-In-The-Dark PTO Coil Form
Shane writes:
Shane G0JNR here. I've just got my Soldersmoke DC rx up and running! The thing that put me off earlier in the year was the 3d printed coil former. But my son has now got one and printer and printed one for me - as an added bonus, it glows in the dark! It didn't work straight away but perseverance has paid off. 73
Thanks Shane! Congratulations and Welcome to the Hall of Fame.
Tuesday, August 26, 2025
One (of several) SolderSmoke Blog Backups: This one in .pdf form
The SolderSmoke Daily News blog now has more than 4,000 posts, and some 10,000 comments. This is both good news and bad news. The good news is that there is on this blog site a vast repository of useful information. The bad news is that I sometimes fear that all this info might be lost if Google someday decides that its blog service should disappear. It could happen, and that is kind of scary, so I have been looking for backups, for ways to safeguard this information.
Several members of the SolderSmoke community have been helping me create WordPress sites that backup the blog. More info will be coming soon. The Internet Archive and the WayBack machine have also been of great help.
While here in the Dominican Republic, I have been working on a kind-of compilation of blog articles, with a bit of an intro. I think readers of the blog and listeners of the podcast might find this entertaining.
So here it is. Please download it to your computer. That will increase the survivability of the blog. I will probably do a few updates to the .pdf file:
http://soldersmoke.com/SolderSmoke Blog Book Compilation.pdf
Monday, August 25, 2025
The World's Largest Radio Telescope -- It is in the Netherlands
Sunday, August 24, 2025
Brian KI7LKB's FB Modifications to the SolderSmoke Direct Conversion Receiver
Wednesday, August 20, 2025
Grant K0GDB's FB SolderSmoke Direct Conversion Receiver
Congratulations to Grant K0GDB on his FB SolderSmoke Direct Conversion receiver. Welcome to the Hall of Fame Grant! That PTO former is especially FB! Grant is a relatively new ham, making his smooth construction of this receiver even more admirable.
Grant writes:
Proof of life video! Many thanks for the helpful YouTube tutorials, everything went together pretty smoothly.
The windings are actually as close to the specification as I could get them on the nanoVNA. It's been a bit since I built that part, but if memory serves I had one fewer turn and had to do some bunching to get it to read correctly. The main difference in the PTO is that I made the former on a laser cutter from slices of quarter-inch plywood since I don't have a 3d printer. The center cyllinder is actually just rolled up paper.
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":
--------------------
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!