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Thursday, May 20, 2021

Cicadas Arrive in Northern Virginia


Usually the only bugs we talk about here are dead bugs (components with their leads up on circuit boards) or perhaps CW keying devices.  But in the last podcast I mentioned  the arrival in Northern Virginia of Brood X Cicadas.  They are coming to the surface after 17 years underground.  This morning I found this amazing animation that explains the lifecycle of these fascinating creatures. 

This morning Elisa mercifully took the time to take several dozen of them off the tires of her car.  

Here is the animation.  Just scroll down to follow the life cycle. 

Be sure to turn on the audio!  

https://www.washingtonpost.com/science/interactive/2021/cicadas-lifecycle-brood-x/?fbclid=IwAR39n951RzQfNPvr3iurHjCDcnDEj2ues0c1UmJFiYV8k5vwO2NZoekKN18


The SST QRP Transceiver

 
Click on the schematic for a better view

Bob KD4EBM recently sent me an amazing package of radio goodies.  Included was a little metal box not much larger than a deck of cards.  It is a 20 meter SST transceiver designed by Wayne Burdick N6KR during the late 1990s.  This transceiver is built around three NE602 Gilbert Cell mixer chips.  It arrived in my shack as I was struggling to understand the Gilbert Cell.  TRGHS.  It also put me back on the path of QRP CW righteousness.    Thanks Bob.  Thanks Wayne. 

I e-mailed Wayne Burdick (now of Elecraft fame) to tell him I was now using the rig he had designed so long ago.  Wayne e-mailed back, saying that the SST was the smallest "real" radio that he had ever designed.  SST stands for Simple Superhet Transceiver

I've been using the SST every day for the last week or so.  It is a pleasure to operate.  I'm using it with the key from India that Farhan brought for me.   It is truly QSK -- the receiver stays on when I transmit.  I've never used a QSK rig before and I can now see the big advantage that this provides:   When I am responding to a CQ, I can immediately hear if the other guy put out another CQ or respond to someone else -- I can stop calling at that point.  My first contact with it was with F6EJN.  Again, TRGHS. 

I made two small mods to the SST:  I added 1 uH to the RFC in the VXO; it  now tunes 14.053 -- 14.063.   And I took out a noise blanker that had been installed. Removing the noise blanker left an ugly hole in the front panel which I promptly filled with a completely cosmetic machine screw. 

Here's the manual:

https://qrpbuilder.com/wp-content/uploads/2017/04/sst_manual_042217.pdf




Tuesday, May 18, 2021

HRDX Interviews Paul Taylor VK3HN


Wow, Paul Taylor, VK3HN is working on homebrew rig #11.  FB.  

This interview was quite thought-provoking. 

-- I agree with Paul about the importance of not being dogmatic about 
always staying under 5 watts.  It sounds like Paul is having fun with his 
100 watt SOTA project. 

-- It was great  to hear that Leon VK2DOB is still active in ham radio and running a QRP company in VK.  FB.  An article by Leon on CMOS mixers in the summer 1999 issue of SPRAT played a key role in my understanding how switching mixers really work.  I put Leon's diagram in my book SolderSmoke -- Global Adventures in Wireless Electronics. 

-- On blowing up the finals in simple HB gear.  The first real transmitter that I built was the VXO-controlled 6 watter from QRP Classics by the ARRL.  It had a 36 volt Zener diode across the collectors of the final.  This was to prevent the kind of final destruction Paul suffered up on that summit:  "D2 is used to clamp the collector voltage waveform to protect the output transistors if the transmitter is operated into an open circuit or high SWR antenna system."  Maybe we should revive the use of that simple SWR protection circuit, especially for SOTA rigs. 

Monday, May 17, 2021

Bill N2CQR Talks to Dean KK4DAS about the Simple SSB Group Build


Dean KK4DAS visited the N2CQR SolderSmoke shack.  We talked about a lot things including chess, Mars, and AI.  Dean is an amazing guy -- he used to work at NASA's Jet Propulsion Laboratory and a couple of times  actually spoke with Richard Feynman. We also shot a video about the Vienna Wireless Society's group build of Pete Juliano's Simple SSB transceiver (video above).  

This group build all started with Dean's build of Pete's rig.  He built his early in the pandemic, while on furlough from work,  thus the name "The Furlough 40." That makes all of this very much a quarantine effort. As we have learned, dark clouds often do have silver linings. 

For more details on the group build, check out Dean's blog:
https://kk4das.blogspot.com/

And here is the Vienna Wireless Society's Group Build page: 

Thanks Dean!  And three cheers for all the Vienna Wireless builders!

Saturday, May 15, 2021

SolderSmoke Podcast #230 is available! Apr 1, Mars, Group Build, SDR, SSB, Mich Mighty Mites, Mailbag

SolderSmoke Podcast #230 is available for download

http://soldersmoke.com/soldersmoke230.mp3

N2CQR was down for maintenance 
A few words about April 1
China lands on Mars
Brood X Cicadas arriving in NOVA 

Pete's Bench
The Dentron Project
The Spillsbury Tindall SBX-11A
KK4DAS and the Simple SSB Group Build
TenTec mods
Shack Mystery solved.  Maybe 
Changing the channels at age 9 

Bill's Bench
Why LSB below 10 MHz? The "SSB Legend" Rig
WU2D RTL-Dongle Up converter
Understanding the Gilbert (Jones) Cell
SDRSmart  RTL-SDR.com V3 Dongle 
VK3HN and 2 meter SSB
Jack NG2E, MMM and the 10 minute transmitter
KD4EBM sends me SST by Wayne Burdick. DX!  
A new computer 

Mailbag: 
MM0ACN
VK2EMU
N5VZH
VE3KZJ
HS0ZLQ
AD0JJ
VK8MC
KK0S
VE3VVH
KB3SII
WA9WFA
M0NTV
W2DAB



 60 Minutes Story on Mars Ingenuity Helicopter: 

Friday, May 14, 2021

The Homebrew Spirit of the Radio Amateur

I just liked this picture.  It seems to capture the pride and satisfaction that comes from getting on the air with homebrew gear. It's obviously a simple QRP station, but it is all homebrew.  And -- from the QSL cards on the wall -- we can see that he has had some success with it.  The map on the wall is of the United States and the QSLs are from the east coast and the mid-west, so my guess is that he's probably on 80 or 40.   FB OM.  

Wednesday, May 12, 2021

The Joy of Fixing Broken Things (a really amazing video)


This amazing 10 minute video captures very well the joy of fixing broken things. It comes to us through a recommendation from Paul VK3HN in Melbourne, Australia. Thanks Paul.

I hope we will see more from Van Neistat.  He already has a bunch of videos on his YouTube channel:   https://www.youtube.com/channel/UC5mPJA4y5G8Z6aNkY6AxgAw

I often tell the story of the OT (probably now an SK) who at hamfests would ask if a piece of old gear was working. If the vendor answered honestly and said no, OT would reply, "Good, I pay extra for that."  He too liked to fix things.

Saturday, May 8, 2021

Chuck Penson WA7ZZE, Heathkits, and the Titan Missile Museum


                                             WA7ZZE Shack

The video above popped up in my Facebook feed today and reminded me of Chuck Penson WA7ZZE.  Chuck is the author of a wonderful book on Heathkits (and several other books). 

The Titan missile explosion (not of the warhead) in Arkansas is described in an excellent but horrifying book entitled "Command and Control" by Eric Schlosser.

PBS made a video out of the book.  You can watch it here: 

Here's an interesting article on nuclear weapons tourism.  It has a great title. 
https://www.nytimes.com/2007/01/05/travel/escapes/05atomic.html

It is easy to see how an interest in ln old technology would lead someone to both Heathkits and Titans.  I get that.  But on the other hand the Heathkits and the Titans are at completely opposite ends of the humanity spectrum:  Heath made friendly technology that ultimately brought people together on the ham bands.   We know that the Titans were supposed to do. 

In any case it was great to be reminded of Chuck WA7ZZE.  We last posted about Chuck more than 10 years ago: 
In a comment to that post, Steve "Snort Rosin" Smith WB6TNL noted that Chuck had spoken at the 2009 CactusCon hamfest, and that the club pledged to put his presentation on-line.  But Google and I can't seem to find it.   Do any of the Scorpions or anyone else out there know where Chuck's hamfest talk is? 

Bob KD4EBM has been out there.  He reports that hams can bring their rigs and make use of the Titan site's large Discone antenna:

Friday, May 7, 2021

NASA Rocket Launch from Virginia to Create Artificial Aurora Saturday Night

 
https://www.news4jax.com/weather/2021/05/06/friday-nights-nasa-rocket-launch-may-produce-high-energy-auroras/?fbclid=IwAR1b3PX3VrT0IzljFiOCYYC1W2HmBMZZqpHqdB7xwNU7MmOeID3BMjHlbwo


"Adventures in Electromagnetism" Video by Julius Sumner Miller


This guy is quite a character, with a real knack for describing physics.  At the start of this video he says that these kinds of adventures are "good for the spirit and the soul."  Right you are Professor Miller.  I am currently recovering from a minor back injury.  It is nothing serious, but it has delayed the production of the SolderSmoke Podcast #230.   These videos are, for me, just what the doctor should have ordered.  

I liked Miller's references to Michael Faraday. 

There are many videos on the Julius Sumner Miller YouTube Channel.  They are indeed "good for the spirit and the soul."   Thanks to Hack-A-Day for alerting us to this treasure trove. 

Tuesday, May 4, 2021

Ciprian's Romanian Ten Minute Transmitter with Roots in SPRAT, KA4KXX, and the Florida Sunrise Net


It sounds great Ciprian!  It was really cool to see your video and hear you reference not only the SolderSmoke blog, but also SPRAT, the Michigan Mighty Mite, and Walter KA4KXX. Your little rig has a very fine lineage!  

I found Ciprian's video just after seeing the wonderful Herndon Mighty Mite of Jack NG2E.  TRGHS!  The Color Burst Liberation Army is on the march!   For more info on NG2E's Mighty Mite, check out his blog: https://jackhaefner.blogspot.com/2021/05/mounting-to-perfboard-and-scope-test.html 

Jack has in his possession one of the  7.123 MHz crystals that Walter KA4KXX sent me back in 2019 (during my ET-2 craze).   It seems obvious that Jack should build a Ten Minute Transmitter and use it to check into the Sunrise Net  https://qsl.net/srn/

Monday, May 3, 2021

A New Michigan Mighty Mite Oscillates in Northern Virginia


We are pleased  to report that OM Jack, NG2E, has successfully built a Michigan Mighty Mite transmitter, and has experienced JOO (the joy of oscillation). You can see Jack's prototype in the video below: 


Jack has his eye on more ambitious homebrew projects, but is wisely taking a step-by-step approach.  He described his plans this way: 
  1. Capture this MMM into a semi-permanent design: ie, perf board.
  2. Measure performance. What does the carrier wave look like on a scope? 
  3. Build a low-pass filter.
  4. Can I amplify the signal? Maybe add an amplifier stage or two. Transistor? 
  5. Next, let's look at receivers. Pete & Bill recommend that I build a Direct Conversion receiver. I know Peter Parker (VK3YE) has a simplified version

Friday, April 30, 2021

Trying to Repair Some Old Gear, He Got Hit with a Dose of LSD!

Oh no, here's something else for us to worry about when working on old gear.  As if the treat of electrocution or radioactive poisoning were not enough, now we have to worry about being hit with a dose of  the 1960's drug culture. That could be one bad trip indeed.  Imagine if you were having a hard time troubleshooting the Buchla Model 100.  All of a sudden things start getting weird and your test gear starts dancing on the bench.  

Fortunately, this is not likely to happen with a rig like the DX-100.  With rigs like that the only similar danger is nicotine poisoning. 

https://allthatsinteresting.com/engineer-accidentally-takes-lsd?fbclid=IwAR2KzZl3qoL6oqq5SqWYquKpHR2mGxk2GN2Kk0O-ytUb9MNXmVNX9XnyeaU

Thanks to Stephen Walters for finding this groovy story. 

Saturday, April 24, 2021

Coming Soon! An N6QW Action Figure!

 

A few quick mods and Bob will be our uncle!  
(Pete will be our Fauci!) 
Think of the many possible accessories:  
A soldering iron!  A beret!  An Si5351!  Pasta!    

It's an INVESTMENT!

 

Exactly what we've been saying about Drake 2-Bs and copies of SSDRA!  

Saturday, April 17, 2021

Argentine SSB (BLU) Homebrew from Guillermo LW3DYL



Really nice work.  BLU is Spanish for SSB.  (Juliano BLU?)

But I think Guillermo needs to build ONE MORE BOARD!  A VFO or a VXO.  Analog. To finish the job.    Guillermo tells me this is in the works -- he selected an IF of 11.0592 MHz specifically so that he can use a variable oscillator built around a 4 MHz ceramic resonator.  

Complete schematic and PC board patterns on his site: 

https://qrplw3dyl.blogspot.com/2021/04/transceptor-blu-para-40-metros.html?fbclid=IwAR0BLMVfVTxMlVy1WyUovVJ0FVrrkMulFxeuu24lkjdkW8j-6QX5g_yV05o




Click on the Bloc Diagram for a Better View:

Friday, April 16, 2021

Homebrew Lives! TWENTY N6QW Simple SSB Transceivers Under Construction in Northern Virginia

IF strip by Don KM4UDX

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.  
-------------------------
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 per SolderSmoke 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.  

-------------------------

Read all about it, and see some really great videos here:  


Leon NT8D's Front Panel


What Kind of Car Would Have this Plate?

 

We are proud to say that the owner is a SolderSmoke listener.  Can you figure out what kind of car he is driving? 

(See comments for answer). 

Tuesday, April 13, 2021

For Your Vacuum Tubes: Isotopic Ionization Sources from U.S. Radium


One or two podcasts ago I mentioned radium in regulator tubes.  As I predicted, this provoked a number of comments about how silly it is to even mention such things. Nonetheless, I find it interesting.  It seems that real radios really do glow in the dark!   

More info on the company: 


Sunday, April 11, 2021

RIP Isamu Akasaki -- Shared Nobel Prize for LED -- Analog Guy


From the obituary in the Washington Post: 

In addition to the Nobel Prize, Dr. Akasaki’s honors included a 2009 Kyoto Prize — Japan’s highest honor — recognizing developments in advanced technology. He found that some technology, however, needed no advancing at all. He took great pleasure, for example, in long-playing classical music records.

On that point, he joked, “I am analog.”

Thursday, April 8, 2021

N6QW On 40 Meters with a Civil Air Patrol Dentron Scout -- WYKSYCDS

 

Pete is in the air with his Dentron Scout.   Check it out: 


WYKSYCDS = When You Know Stuff You Can Do Stuff.  Pete proves it.  

Wednesday, April 7, 2021

"The Perfect Trap for the Engineering Mind" -- Leo Fernekes' Stirling Engine


I did a post about Leo back in August: 

Although it is not about radio, homebrewers will find much to resonate with in Leo's Stirling engine project.  

Warning:  There is a Part II.  And there may be more.  Proceed at your own risk. 

Sunday, April 4, 2021

A Satellite Ground Station (Receiver) Made from Junk


Very cool.  This guy (who brew up on an island in Alaska) really knows how to use aluminum tape and the junk that fills most workshops. I like his use of the security camera mount as an az-el antenna rotator. 

I foolishly discarded a Direct TV dish.  I could have been receiving GOES images by now! 

Just last week I got the same RTL-SDR.com V3 dongle that he is using.  Very FB.   It does HF direct sampling with no hardware mods and no upconverter. 

More from the builder, Gabe Emerson (KL1FI): 


Saturday, April 3, 2021

A VERY Successful April Fools' Day

 
I was worried.  It was early on the morning of April 1, 2021, and I had NOTHING. Maybe this  was because so much unbelievable stuff has recently happened in the world.  Or maybe it is because technology has been moving so fast that today's April Fools' joke is tomorrow's new device. Whatever the reason, for the first time in about 15 years, I had noting.  April Fools' Day has long been part of ham radio's culture and I was worried that I would not be making a contribution this year. 

Then something caught my eye.  Did you know that on Thursday they decided to change the rules of chess!  Yes indeed!  NO MORE DRAWS!   Fantastic!    This provided the inspiration for our announcement of the brutal FCC rule-making action regarding the banning of "legacy equipment."  

I knew that that headline would attract a lot of attention. And let me inform you that, according to the official rules of April Fools' Day,  if that headline did pull you in,  well that constitutes a "gotcha."  So far 1,758 people are in this category.  I thank you all.   

The comments attached to the announcement were really heart warming, even those that included profanity directed at my persona.  People recalled earlier April 1 events, like the time Pete was defenestrated from the QRP Hall of Fame.  Good times, my friends, good times!   

This was an especially happy April 1 for me, because I also launched two other highly successful operations: 

-- I teach a Zoom class.  On Thursday morning I told the students about new concerns regarding  the light hitting their eyes from the computer screens.  We were all being issued dark glasses and would henceforth have to Zoom with shades on (see above).  The students -- bless their hearts -- all agreed to do this.  

-- We are closely associated with a small company that has the word "native" in the corporate name.  As in "Native Vegetation."  Shockingly, last Thursday we got an e-mail from the Virginia Small Business Commission DEMANDING that we change the name of the company.  It seems that ANY use of the word "native" was now deemed unacceptable.  The people in this company (ALL OF THEM!) were really outraged by this.  I had to pull the plug before any legal actions were initiated!  

So, to all of you, Happy April Fools' Day!     

Thursday, April 1, 2021

FCC to Ban "Legacy" Equipment and Circuitry


From the FCC Newsline: 

Out with the old

In a long-expected policy move, the Federal Communications Commission today announced that starting on April 2, 2022,  all equipment in use by the amateur radio service must comply with strict emission purity standards.  The Commission's rule-making focuses on the bandwidth of high frequency transceivers.   Starting one year from tomorrow,  amateur equipment will be limited to a bandwidth of 3500 cycles per second.   Emissions outside the bandwidth limits must be at least 100 db below the average power in the bandpass.  In effect, this means that amateur equipment must make use of the kind of "brick wall"  filtering only available from software defined equipment.   Bringing the service into conformity with commercial practices, all high frequency equipment will be on Upper Sideband.  

"No more skirts" 

An FCC official -- who requested anonymity because of "threats"  -- told Newsline that part of the motivation behind today's announcement was a desire to end the unseemly discussion of the filter "skirts" of "legacy" ham radio gear:  "Obviously there were concerns about the pejorative way many hams were referring to 'the skirts.'  This is the 21st century!  It was time to be more inclusive!" 

Audio Tinkering to Continue

The FCC official told Newsline that the Commission is not in any way attempting to discourage hams from tinkering with the "audio quality" of their commercial SDR equipment: "As long as they keep the bandwidth to 3500 Hz, they can tinker and adjust to their hearts' content," said the official.  He went on to use some of the colorful language recently heard on the ham bands: "If they want to include very low audio frequencies -- what some call 'the thunder down under' they can do that.  Or if they want to emphasize the high frequencies -- for that "Krispy Kreme" sound -- they can do that too.   All they have to do is learn how to set  the menus on their equipment. We understand that the manufacturers will soon be making available software packages that will -- with just a simple download -- set the menus according to the desires of the consumer. Uh,  I mean of the radio amateur." 

The FCC official said he thinks the ruling will actually encourage and facilitate audio tweaking. "We know this is important to modern hams.  It makes them feel connected to the days when hams actually built their own equipment.  We have noticed the development of an amazingly rich  technical vocabulary, terms like 'presence'  "muddy'  'bright'  and 'punchy' are now in common use.  Clearly the Commission would not want to stand in the way of this kind of technical advancement!"

Sinking the Boatanchors

The FCC acknowledged that this ruling spells the end for on-the-air use of  older ham equipment. "Clearly none of that old junk will meet the new requirements.  I mean these guys were literally using hunks of rock to filter their sidebands.  It was practically medieval!  Time to wake up, smell the decaffeinated coffee, and get with the SDR program OM!" 

Fears of violent push-back

The FCC official did acknowledge that there are fears of possible violent push-back from certain "sub-cultures" in the ham radio world.  "Working closely with our partners in Homeland Security, we have looked closely at the possibility of violent pushback.  Of particular concern are groups that appear to be fiercely loyal to what they sometimes defiantly refer to as 'Hardware Defined Radio.'   There are some truly frightening groups out there.  One group is called the CBLA -- The Color Burst Liberation Army.   They seem especially fond of quartz crystals and are radically opposed to the new SDR requirements.  Also of concern are groups that continue to insist on using Double Sideband Unsuppressed Phone generated by equipment using vacuum tube.  Vacuum tubes! They call them 'thermatrons.'  Again this is really medieval."  The spokesman said that the FBI is monitoring these groups, but is not very concerned because of the physical condition of many of the fanatics.  "Most of these guys rarely leave their homes.  In fact, for the last year many of them seem to have been repeating a strange "Stay in the Shack" mantra.  Many still smoke, never exercise, and now refuse to take the vaccine.  So we are not too worried, " said the FBI spokesman. 

Support from Industry and the Major Ham Organization

FCC officials tell Newsline that the major equipment manufacturers -- along with the principal ham radio organization -- were very supportive of this move, seeing it as a major opportunity to "stimulate" both sales and advertising revenue. 

Wednesday, March 31, 2021

Mending vs. Ending -- The Fight Against Planned Obsolescence


We don't get a lot of mail from Darwin, Australia, so the message coming in from Phil VK8MC immediately got our attention.  When I looked into the details I realized that it was very SolderSmoke-relevant.  The Guardian article that Phil cited even mentions hobbyists tinkering with electronic devices in their sheds (that would be us!).    Phil points to the connection between our repair efforts and the struggle to save the planet: "It's not just a hobby, it's an ethical position which contributes to the well being of the planet. A higher calling indeed!" 

Here is the article Phil pointed us to:

https://www.theguardian.com/commentisfree/2021/mar/17/ending-over-mending-planned-obsolescence-is-killing-the-planet?CMP=Share_AndroidApp_ProtonMail

The poster above (which hangs above my workbench) is from https://www.ifixit.com/Manifesto


Monday, March 29, 2021

"Analog Man in a Digital World" by OM Joe Walsh (music video)


After seeing my last post about SDR, the dongle, the Android tablet, and the Bluetooth mouse, Bob Keller grew concerned about my, uh, stability.  Here is our e-mail exchange. 

Bill, 

Have you had a comprehensive medical evaluation recently? All this digital activity from an erstwhile analog man is a concerning symptom. <g>

I suggest listening to the following number at least once each day until you have the chance to get checked out:



-- 73 de KY3R, 
    Bob Keller


Bob: 

I know.  It really is quite disturbing.  I've been getting a lot of "welcome to the dark side" messages!!!  

I am now trying to get back in the good graces of The Radio Gods.   Today I fired up the Fish Soup 10 and made two CW SKCC contacts on 40 meters.  I feel better already.  

Thanks for the song from OM Walsh.  I had heard it before but it is more meaningful to me now.  I will put it on the blog.  Others may need help too.  

Thanks for caring Bob.  

73  

Bill 

Tuesday, March 23, 2021

Double Sideband Transmitter using Vacuum Tubes -- From Sweden


Tommy SA2CLC has built a really nice DSB transmitter using Thermatrons.  
FB Tommy.  
Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column