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Thursday, May 20, 2021

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

Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column