Just go to http://soldersmoke.com. On that archive page, just click on the blue hyperlinks and your audio player should play that episode.
http://soldersmoke.com
This has to be one of the most successful of SSB group-build projects. Dean KK4DAS has been leading 20 members of the Vienna Wireless Society in the construction of N6QW's Simple SSB Transceiver, with Dean's "Furlough 40" additions. This is very FB, and very encouraging. Dean clearly has The Knack. Just two winters ago I was smuggling a 3.579 MHz crystal to Dean for use in a Michigan Mighty Mite. He has clearly made a lot of progress.
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Dean writes:
It has been just over a year since I completed my initial build of the Furlough 40 with much coaching and assistance from Pete. Mike and Don are two out of 20 members of the Vienna Wireless Society Makers group that is working on a group build the SimpleSSB project as enhanced by me to include features like CAT control for digital modes. Beginning about six weeks ago the group is progressing module by module perSolderSmoke best practice advice. We started with the audio amplifier, followed that with the Arduino/SI-5351 based controller module and the builders are just completing the IF module. This week at our weekly meeting, Mike proudly showed off his success.
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Read all about it, and see some really great videos here:
In SolderSmoke podcast #229 Pete and I were discussing my rather flaky effort to turn the Hodgepodge BITX40 Module into a CW rig by injecting keyed 700 Hz audio into the mic jack (see video below). We got some very helpful responses from ND6T and VK2EMU:
Hi Bill,
You mentioned generating CW by modulating SSB: Collins did that in their
first SSB transceivers, I believe, as did SGC, but the results were less
than optimal. The problem is that you are involving the audio chain and
modulator. You know from experience how difficult it is to maintain low
intermod there and the tone is no exception. So we end up with lots of
spurs within the filter passband and then also have the opposite
sideband suppression less than perfect. If you check your transmitted
signal with a spectrum analyzer or SDR you can easily see the nasties.
Listening to a CW signal thus generated makes it obvious unless it is
buried way down in the noise. It IS a valid CW signal (not MCW) since it
is (almost) a single signal. However, in actual operation it doesn't
work very well.
I know because I have done that. I bought one of Farhan's original
BITX40 boards and wanted to put it on CW. I ended up injecting a keyed
signal from one of the spare clocks on the Si5351 into the RF amplifier
chain (thus avoiding the above stated problems) but still had garbage
from the audio and IF stages. I fixed that by shorting out that signal
during transmit by a transistor to ground. That was documented on your
With putting an audio oscillator into you hodgepodge radio, your transmission is not the same as a standard CW rig.
If we have a transmitter as described in the ARRL handbooks from the 1940's or 1950's, (or even the Michigan Mighty Mite) it is a crystal oscillator and maybe a PA tube. By keying either the oscillator and/or the final PA on and off, then we can send Morse code as ICW Interrupted Continues Wave. If we check the list of emission designators, we have A1A.
However, if we feed a tone into a SSB transmitter, then we have J2A.
At the other end it may sound the same, but because it is created in a different way, it has a different designation.
A quick look at Part 97 shows that J2A and J2B are classed as CW, so you are in the clear. However, if you put a tone oscillator into an AM signal to send CW, then that would be classed as A2A and not classed as CW, but as MCW. MCW can be used on 6 meters and above, but not HF.
So I say BASTA with the J2A! If I want to go CW, it's all A1A for me. I dusted off my Fish Soup 10 and am now back on 40 CW with 200 mW.... A1A all the way!
I just decided here over the COVID period to head back to basics here and build a Michigan Mighty Mite with a Color burst crystal I had here. And wouldn't you know it, it works! Here's a couple of pictures, it's not pretty at all. Needs to be mounted on something.
From Walter KA4KXX June 21, 2020 Michigan Mighty-Mite: Why So Complicated? The April 2020 issue of QRP Quarterly magazine featured an article by Bob Rosier K4OCE which included a schematic for a “Ten Minute Transmitter” by G4RAW (SK), which apparently first appeared in SPRAT 82 in 1996. It is even simpler than the Michigan Mighty Mite, so this transmitter can truly be built on a solderless breadboard in about 15 minutes, because a complex coil is not required. The only tuning needed was for me to establish the correct value of the output series capacitor. This rig allowed me to check-in to the Sunrise Net (see details in blue text on my QRZ page) today on my very first attempt, and landed me a 549 signal report from 250 miles away. The first photo shows the transmitter connected to a Transmit/Receive Switch mounted in an Altoids box. In the Transmit position the antenna is disconnected from my 1979 Heathkit HR-1680 receiver, which then coincidentally supplies a sidetone at an ideal volume level. That little black pushbutton which can be seen in the second photo serves as my key, and works just fine for a five-minute daily QNI on the Sunrise Net. Of course, part of the secret is having a crystal exactly on the Net frequency, and I have a few left, free to whomever in the Eastern U.S. is interested in building one of these simple Sunrise Net Special Transmitters and participating in our Net.
Thanks for the work you put into your podcast. I’ve been listening to it on my commute and while at work (I’m a welder/fabricator). Fantastic content. Keep up the great work.
All your talk about Farhan and the Ubitx convinced me to order one. I welded an aluminum case for it and upgraded to the Nextion 3.5” screen. Also added a tuning knob from a Heathkit SB-401. So far I’m really enjoying this rig. Plan to add an audio amp (to drive a larger speaker) and a CW filter to it this weekend. In the station picture I sent I also show my paddles made from a hacksaw blade and stainless steel hardware. It’ll send 25 WPM before it gets a little sloppy. My QCX 40 is also pictured. I have a commercial rig too but find I’m not using it very often.
Plan to start building the simpleceiver soon and maybe a bitx 17 too. Your podcast played a big part in convincing me to pick up a soldering iron again. You guys are awesome. Keep it up.
73’s
Adam
N0ZIB
(Pete noticed that the main tuning knob on Adam's uBITX was NOT from Heathkit but was instead from a Collins KWM-2 or 32S3. He advised Adam that the knob would sell quickly on e-bay. It did, and will finance additional N0ZIB homebrew projects. We are thinking of adding these knobs to our SolderSmoke Retirement Fund Portfolio.)
Adam continues:
I was listening to your older podcasts and heard several discussions about the Michigan Mighty Mite. So this jumbled up mess probably doesn’t look like much but I built one. I need to order a 40 meter crystal and actually build it again on a board(with the coil rewound for 40) but my “proof of concept” build was a success. Using a variable cap from a Hallicrafters S20-R and the crystal holder from a Heathkit.
You can almost see the excitement in the notes (al fresco!) of Dean KK4DAS. He made his first QSO with a homebrew transceiver this week. Not long ago Dean was taking his first tentative homebrew steps with a Michigan Mighty Mite. Wow, he has made great progress.
Leif WB9IWT has, during the emergency, been working on a Michigan Mighty Mite (See pictures above and below). FB Leif. But also check out the very astute comment from Rick N3FJZ (below) . I am, of course, all in favor of the HPMR Factor. Almost all of my rigs would score quite high. Others, I know, would seek a low score. To each his own. This is all for fun.
Leif,
Great work. If a ham from the 1920's were to see this rig, they probably wouldn't recognize the actual components right away (but knowing hams, they would no doubt figure it out), but the breadboard layout circuit flow would be immediately recognizable; e.g. the plug-in crystal, the coil, binding post. The transistor and variable capacitor may baffle them at first, but seeing there are three leads on the transistor would start to give them clues.
That's the cool part about analog discrete component radio, no matter how many years go by, and the appearance and size of the actual components change, the physics of what's going on at the electron level stays the same (SDR not withstanding).
I guess this could be a litmus test for us analog radio builders. It could be called the "Hiram Percy Maxim Recognition Factor" or "HPMR Factor" with a range of 0 to 1. After you build your rig, take a look at it and pretend that you could present it to Mr. Maxim and the more he could understand the circuits, components and circuit flow on his own, the closer to a factor of 1 your radio would achieve. For example, an SDR might only achieve a factor of .1 or even maybe 0, where as your rig may achieve a factor of .8, and one of your crystal receivers would definitely get a 1.
Someone could even workout a check list or formula where you would add or subtract some fractional numeric values for each component you used; e.g. you would subtract some value for every IC chip, microprocessor or LCD display you use, and add some fractional value for each hand wound coil, vacuum tube/valve or open air variable capacitor, et cetera.
Be sure to check out the blog of Dean KK4DAS. He is a new homebrewer who is having great success with one of Pete Juliano's ingenious SSB designs. Dean has a video of his receiver working -- AL FRESCO -- as construction on the full transceiver proceeds. This is amazing. Just a short time ago Dean was taking his first steps as a homebrewer with his version of the Michigan Mighty Mite. He has followed the advice of the Tribal Wizards and has proceeded slowly, step by step, stage by stage, gaining the experience that has allowed him to actually build a superhet receiver and be on the verge of completing a full SSB transceiver. Lots of inspiration to be found on Dean's blog. Check it out: https://kk4das.blogspot.com/2020/03/dean-kk4dass-furlough-40-ssb-rig.html
Travelogue! Dominican Republic trip. uBITX on the Beach. EFHW. LiPo Battery. First contact of the new year.
Bill's Bench Report
Following up on proposed uBITX mods:
-- Put pot on sidetone line from Raduino to keep the sidetone a bit quieter.
-- Fixed the key -- pounding brass
-- Will install 4 States QRP Active AF filter.
-- Need to reduce power on CW to 5W
-- Stereo to mono headphone adapters.
-- Turning off display and mic amp circuit not really worth it -- they don't pull much current.
Pete's Bench Report:
ELMAC Power Supply project
1930s era transmitter?
Teensy and SDR
PETE'S IDEA ABOUT GETTING LSB AND USB FROM BITX40
KWM-2 suggestions
Back to Bill's Bench:
Working on HRO-ish Receiver.
Bad SBL-1
Got idea for wider ceramic filter from Paul VK3HN
Ordered parts from Mini-kits in Australia. They sent 6kc filters.
Bruce KK0S sent me some 10 kc filters too.
Installed 6 kc filter with L network matching networks. Works great.
Also installed Infinite Impedance Detector that Paul used.
Needed some additional amplification ahead of the IID, so I used one stage of BITX amp.
Works great. I can tune full 40 meter band AND 49 meter SW band. Radio Romania, China, Radio Marti, Brazil, South Carolina.
Beefed up the shielding to cut down on AM detection.
MISCELLANY
-- AM and DSB in LTSpice
-- Duly Noted: Paul VK3HN's RIG: "THIS MACHINE KILLS KILOWATTS"
Kanji YC3KNJ's QRPesso Expresso Coffee in the field
-- The DANGERS of powerful magnets.
MAILBAG:
--KK4DAS Dean doing great things. MMM heard at Penn State. Where is the rest of the CBLA?
-- Thanks to Don for kind donation to the SolderSmoke cause
-- Dale BA4TB -- First SolderSmoke feedback from China. Thanks Dale!
--Steve Silverman: Sideswipers and bugs were made to handle "carpal tunnel of the day" So do I need a keyer for casual CW work?
-- Peter VK8VWA on the limited knowledge gained from kit building. Listens to podcast while walking on the beach in Australia.
-- Allan Hale -- Clothes Pins as Toroid holders. Yes! More Clothes Pins Wild Woody Keys from Dave Ingram
-- Pete WB9FLW 100 Watt Amp from WA2EUJ
-- Dave Wilcox K8WPE A medical question: Does the Michigan Mighty Mite work differently depending on what kind of medicine was in the pill bottles used for the coil form? Good question Doc! Dave suggest that putting CBD on the coil or the crystals. Anything to mellow out the ham bands...
Pete's Plank SDR When you know stuff, you can do stuff!
Dean KK4DAS continues to do great things with his Michigan Mighty Mite. He has been calling CQ on the Color Burst Liberation Army (CBLA) frequency of 3579 kHz. I think I was the first one to hear him, but since that memorable moment he has been picked up by multiple Web SDR receivers, including the one at Penn State (PETE JULIANO'S ALMA MATER!) (screen shot above, listen by clicking URL below). He has also been heard by Web SDRs in Concord Mass, Newport News Va, and Cleveland, Ohio. FB Dean.
So come on folks -- this is a mobilization call for the CBLA! Get those MMMs on the air. Send us reports and recordings from Web SDRs or the RBN.
Listen to Dean's MMM as received at the Penn State Web SDR:
QRZ.com says we are 5.9 miles away. The U.S. Postal Service almost prevented this from happening -- they objected to my just putting the crystal in an envelope and mailing it. Dean's wife had to pay postage due. The rig didn't work at first, but Pete N6QW provided sage advice and tribal knowledge. Adjustments were made and Dean experienced the Joy of Oscillation. Then, he connected an antenna and was heard at the SolderSmoke East Coast HQ.
Obviously the beret was the key to Dean's success:
This was a lot of fun. And it is a reminder of the power of the MMM. Dust off those Mighty Mites! Call CQ and see if you can be picked up by the Reverse Beacon Network. Let us know if you succeed.
Winter is approaching ladies and gentlemen, and it is time to think about radio projects. Bob N7SUR suggested a direct conversion receiver project. I think this is a great idea. As a kid, I had fallen victim to the idea that building receivers was "too hard" for radio amateurs. Not true! DC receivers to the rescue! Carry on with the DC revolution first launched by Wes W7ZOI in 1968. Pete N6QW is providing guidance and tribal knowledge via his blog. For those of you who want to join the ranks of those who have defied the conventional wisdom and have broken through the "receivers are too hard" barrier. I say build yourself a DC receiver. Build it from scratch. Many of you already got your feet wet in homebrewing with the Michigan Mighty Mite project. Now it is time to jump into a DC receiver project. You folks already know what kind of VFO Pete will prefer: It will be an Si5351. That's fine. But I will try to keep the banner of discrete component analog ludite-ism flying high. This morning I ordered a batch of 7.37 MHz ceramic resonators. I hope to pull them down into a significant portion of the 40 meter phone band. If this works, I will share the batch with anyone who wants to joining my Analog Army (remember the CBLA?). Note (above) that Pete has magnanimously left open the possibility of using a non-digital VFO. What a guy! Check out Pete's project here: http://n6qw.blogspot.com/2017/08/a-new-line-of-transceivers-difx_19.html
(Link to video appears below.) Stephen G7VFY sent me the link to Mike WU2D's Retro-QRP video. In the last month spoken to Mike at least twice on 40 and 75 meter AM. Stephen was responding to a post I did about a 1958 18 milliwatt solid state QRP rig.
Mike's video is really wonderful. I've never been into military surplus, but this video made me think I might want an ARC-5. The rig Mike builds and tests is very similar to our beloved Michigan Mighty Mite. His description of the build and the testing procedures he used will be of great interest to those who've built the MMM rigs. And he made some contacts. Finally, there is a cameo appearance by Paris Hilton. And she is holding a HOT transistor! Wow!
Mike has a real talent for making these kinds of videos. Thanks a lot Mike -- see you on 40. And thanks Stephen (Stephen has sent us so much great stuff over the years, including a fantastic box of British valves.) Pete: See how nice it is to get back to QRP? Here's Mike's YouTube Channel. I love the intro: https://www.youtube.com/channel/UCN7RQv_qmzhzuJV1HhJ4OEA
Doug KB8M did a beautiful job with his Michigan Mighty Mite. But, as often happens, it still didn't work. He turned to us for advice. I gave him a long list of things to check, but Pete brought the power of superior tribal knowledge to the problem and spotted the defect immediately: The transistor was in backwards. It is a P2N2222. That means the pin out it C-B-E not the usual E-B-C. I had fallen into this trap with one of my BITX rigs and had to pull out and reverse many of those transistors. Fortunately for Doug he had used a socket for the transistor. TRGHS!!!!!!!!!!!!! JOO!!!!!!!!!!!
I was on twenty today with my BITX, finishing up a rather disheartening contact with a fellow who told me that he is a "checkbook operator." I was trying to encourage this fellow to build something simple -- perhaps a Michigan Mighty Mite? He told me that he might give it a try, but only 16 years from now, after he retires. It was like a case of the Anti-Knack! Then Keith N6ORS saved the day by calling in with his beautiful MIN-X HOMEBREW transceiver. We had a nice talk -- Keith mentioned the beauty of Pete's "Blue Rig." That's HB2HB (phone) QSO #5 for me. Thanks Keith!
Bill, That was great fun! I was just tuning around and heard you mentioned the Michigan Mighty Mite so I stopped to listen and realized it was you! Well here was my chance for a homebrew to homebrew with 'the man' himself. I wanted to record it but missed the chance. Here is the Min-x boxed up. the case is made from thrown away computer cases. It runs about 70watts on 160,80 and 40 meters and about 35watts on 20 meters. I promise to write it up, maybe even draw a schematic. hihi. 73, Keith N6ORS
sTef DL1FDF/VY1QRP alerted us to this multi-band Michigan Mighty Mite beacon project out of Sweden. They certainly have some fine looking rigs! Check out the reports: http://www.radiorud.se/fyren.php
On April 12, Tom Gallagher NY2RF was in DC and was kind enough to make some time in his schedule for us to get together and talk about radio. As we mentioned on a recent podcast, Tom, who has recently taken over as Chief Executive Officer of the American Radio Relay League, is a true FB ham. He has a restored Drake station that he keeps on the air, and was recently talking up the Michigan Mighty Mite during his interview with Eric 4Z1UG in the "QSO Today" podcast. And he is a SolderSmoke listener. It was great to finally meet Tom.We are all lucky to have him at the ARRL.
A few days ago I received an e-mail from Jan PA3GSV -- Jan is working on a receiver similar to my old Mate for the Might Midget and had some questions about how I'd handled the filter portion of the circuit. Then on Sunday, while listening to Eric's interview with Farhan on the QSO Today podcast, I got so enthused that I felt compelled to work on a homebrew receiver. So out came the old Mate for the Mighty Midget. I built this thing in 1997-1998. It is described here:
In the above video I was listening on 75 meters to a very congenial early morning roundtable featuring W4CH, K5KBZ and others. I know, I know, this is the third or fourth video that I've made of this thing. This is almost as bad as 2B-mania. Or the Michigan Mighty Mite thing. I blame Jan. And Eric. And Farhan. And Grayson. And Lew McCoy!
Here is my e-mail exchange with Jan:
Bill:
I recently build the W1TS two tube xtal controlled transmitter, and am looking for a 80/40m companion for this that has a crystal filter.
At first, I wanted to build the “Simplex Super” and finally got hold of the 1700 kc crystals, but then they got lost in the mail…
Only part of a two box shipment arrived, with 455 kc fundamental frequency FT-241 crystals, so now I am looking for a diagram using a 455 kc IF. Jan
Jan: In this link you will find the schematic for the receiver I built.
I was not able to build the filter with the two 455 kc crystals. I could not obtain the needed crystals. I used two 455 kc IF transformers as described in my article. This resulted in a very broad frequency response but it was OK and quite good for AM.
Last year I put in a Toyo 455 kc SSB filter, but I did not match the impedances, so the results were not good. Your e-mail makes me want to work on this again!
Let me know how your receiver turns out.
73 Bill N2CQR
Thanks for your reply.
It is a neat looking little receiver.
And yes, I also have a cardboard box labeled “good junk” which is filled with stuff from ham fests J
Finally it will be put to good use!
I printed the article for some evening reading this week.
It will take me some time building this receiver, as there is some metalwork and mechanics involved.
I will let you know how the receiver turns out, and I am also curious what improvements you make on yours.
Thanks again, and I will let you know.
73 Jan PA3GSV
Wow, Jan has the Knack! Check out his station:
That's the W1TS rig on the left. More pictures from Jan on his QRZ.com site. He too uses wood cabinets! I'm not alone! Here's Jan, PA3GSV
Here is my contribution... After managing to somehow get my hand wound transformer to melt a pill container, I used my Dad's hand made, circa 1950 transformer and got it working on a 1.4 MHz xtal and also on 3.58 MHz with a colour burst xtal. A re wound coil on the remaining unmelted pill container worked on 40 meters. I succeeded in getting my Mighty Mite working on three bands. My father would have been pleased, as this was kept aside all this time and now has been put to use. He had built the coil while working part time in post World War II England at the GEC labs in U.K.
Thanks for the motivation! I'm going to move forward and clean up the 80 meter signal and see how far it goes on the reverse beacon website.
The coil form was about 80 turns on a 1 inch diameter with a 20 turn secondary that I used for the center tap portion by joining both bottom ends. Then I wound an 10 trim secondary, loaded up with a 50 ohm resistor to tune up (capacitor fully opened up) on 3.58 MHz in the video, and the audio coming from my receiver tuned to the 3.58 MHz signal.
I have been catching up on the last few SolderSmoke podcasts after that little QSO Today diversion. I wonder how many others did the same thing? I have really enjoyed these recent 'casts. Lots of fantastic HB content. Funniest moment was when Bill described his post-project workshop as looking like the aftermath from an electronic barfight.
I took a new ham up on a SOTA activation last year. Then about a month ago, he said that he wanted to do HF HB. He said he had been googling and found so much that he didn't know where to start. I told him that I'd be interesting in doing a beginner HF HB project with him.
I could have pointed him to LBS, et al. I could have pointed him to the Michigan Mighty Mite. I did neither. I pointed him to:http://web.cecs.pdx.edu/~campbell/EMRFD1dot34.pdf Note the name of the document. I pointed him also to:http://www.arrl.org/files/file/Product%20Notes/chapter_1.pdf (Did you guys know that chapter was online and free?) We scaled to 20m and kitted parts for this. And parts for a 4th transistor PA for serious QRO. :-)
Two others joined us building for 40m. Check out the attached photos of the first 3. The joy of oscillation was experienced by all.
After testing each oscillator, and borrowing from an article KK7B ran in CQ VHF, I told each that he had to ID every 10 minutes. Even though nobody was going to hear these signals a few hundred yards away. (But it sounds loud on a shortwave portable a few inches away!) I even wrote out the dots and dashes for a couple of them.
Next stop: to have everyone find a curbside TV discard, rip out some parts, and get on 5 meters! Haven't we gotten it back now, after the transition to digital TV? :-)
OK, maybe the next stop is to add some gain stages and experience the joy of communication. The joy of QSO-ification? The joy of EM-radiation? :-)
"SolderSmoke -- Global Adventures in Wireless Electronics" is now available as an e-book for Amazon's Kindle.
Here's the site:
http://www.amazon.com/dp/B004V9FIVW
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