N3FJZ's Al Fresco. BITX-inspired, TIA. 50 Watt, SSB Rig (Video)

The last blog postings on Rick N3FJZ were in 2015.  Rick sent me a very uplifting reception report, then we had a pretty amazing Homebrew-to-Homebrew contact.  

Paul Taylor VK3HN yesterday alerted me to a new YouTube video that shows the progress Rick has made with his homebrew SSB rig.   

This is a great example of true amateur SSB construction.  Rick is making use of a combination of digital and analog technology.  He is adapting circuitry developed by others and using it to meet his needs.  During the development stage he is keeping the circuit open (Al Fresco) so that he can easily work on it.  

FB Rick.  

Novice Rig Round-Up -- March 7- March 15, 2020

I may go with my Drake 2B and HT-37.  But If I get ambitious (and masochistic) I might try to involve the Hallicrafters S-38E that has been torturing me lately.  And I do have a DX-40 on the shelf... 

Here is the announcement:  

http://www.novicerigroundup.org/

VE7SL has a really nice description of the event with great pictures: 

http://ve7sl.blogspot.com/2020/02/here-comes-novice-rig-roundup-nrr-2020.html

KG7TR Describes his Homebrew SSB Rigs (Video)

We have posted before on the amazing homebrew creations of Mike Bohn KG7TR. 

Today I watched this 54 minute video in which Mike describes his rigs. (Thanks to Pete Eaton, WB9FLW for pointing me to a site that has this video.)    

Quote from KG7TR:  "I have never destroyed a pristine Command Set." 

Wonderful tribal knowledge throughout, especially on the metal work, parts acquisition, front panel work and toroid placement. 

Clear you schedules.   This is really worth watching. 

How to Measure Output Impedance (video)

Thanks to Tony Fishpool G4WIF for alerting us to this very useful video by Alan Wolke W2AEW. 

Alan's video channel is a real treasure-trove for homebrewers.  

It was very cool to see "AEW" inscribed on the function generator that Alan built 30 years ago. 

Be sure to stay to the end of this video for some electronics humor from Alan.  (Steve Silverman:  Take note -- we might want to add this to the lexicon.) 

Now I'm going to search Alan's YouTube channel for a video on how to measure input impedance. 

From a Student of C.F. Rockey, W9SCH

C.F. Rockey W9SCH

We have discussed the monumental work of C.F. Rockey, W9SCH, SK before.  Yesterday a comment appeared under that post that is just too good to leave buried in the comments.  It appears below.   Jeff's comment also caused me to dig up my small collection of "The Five-Watter" issues from the Michigan QRP Club.  Rockey wrote a column for that magazine.  It contains a lot of tribal knowledge.  Here is Jeff's look back:  


This turned up for me in a Google search for "Charles Rockey QRP ARRL" during a phone call with a friend of mine who was bemoaning that he never got a novice license because he could not master Morse code (he is in his mid-60s, as am I). I was taken back to the communications electronics class I had my freshman year at New Trier East in Winnetka (not Wilmette) IL in 1971. That class was taught by none other than C.F. Rockey, known to us students as The Rock. I think about him fairly often because I grew up to become a very hands-on engineer and can recall parts of his class quite clearly, even at this remove. Somewhere I still have the reports we had to write (typed on a typewriter) each week. He was a huge influence on me and I was saddened to have his passing undeniably confirmed for me. I have the little chemistry book he authored beside me now *Electrons, Atoms and The World* and am glad to be able to read his obit. One thing needs to be added to it: He won the ARRL 5000 mile-per-watt award for working Anzio, Italy from his home north of Chicago on 5W. I am very lucky to have had him as a teacher and mentor for those years. Thanks for sharing. Cheers, Jeff Mizener, DFW-TX

For those rare occasions when things go well....

SolderSmoke Podcast #218: S-38E Woes; CW filter for uBITX; A Teensy Explosion; Mint, Cheese and Peaberries; Mailbag; A SPECIAL PLEA FOR FEEDBACK

SolderSmoke Podcast #218 is available 

http://soldersmoke.com/soldersmoke218.mp3

SolderSmoke 218 is Sponsored by AF4K Crystals: 
 Bry Carling can get you the crystals you need. 

Go to:  http://www.af4k.com/crystals.htm

Flying drones with Billy.  Amazing tech out there.  In the 50 buck range with video cameras and facial recognition and tracking.  Check out Air Pix. 

Bill's Bench: 

Active CW filter in uBITX. 

Hi-Per-Mite from 4 State QRP.  Easy to do. Works well. 

uBITX to 5 W level. 

S-38E adventure.  

Replaced antenna input coil BUT -- it came from an earlier S-38 and doesn't resonate. 

So I bought a junker on e-bay and will take the E model coil out of that one. 

Had to re-string the dial!  And add rosin to it from Maria's old violin. 

BFO was not working.  Bad buzz sound. 

So:  Re-cap, Re-tube, Re-string, Re-align, Re-build power supply.  

Shortwave sounds good.  Nice to hear music coming from our machines.  

SHAMELESS COMMERCE DIVISION:   Please use the Amazon Search Box in the upper right hand portion of the blog.

Pete's Bench

A teensy-weensie explosion and fire

Mint!  Kl7FLR

60 Meters

Cheese    Microscopes

Peaberry

Radig

California hams using online SDR receivers for local nets.  

News You Can Use!

J-310s in LTSpice

MAILBAG

K5HCT August via Regen and YouTube

Doug WB5TKI and his wife read "Us and Them."

Rich K7SZ finally following SolderSmoke Podcast.  Welcome aboard Rich. 

Rick KD4KRA  His son was one of the kids in the MIR-Classroom contact that I monitored around 1993...

David AD8Y  Read SolderSmoke Book.  Similar Knack story.  Shared 1978 story:  Homework net on 75 meters.  

Paul KL7FLR Tapping and other tribal knowledge. 

Dave K8WPE   Says I'm fortunate to have a supportive wife.  So true. 

SPECIAL REQUEST:   IT IS VERY DIFFICULT FOR US TO KNOW HOW MANY PEOPLE ARE LISTENING TO THIS.  SO PLEASE, SEND AN E-MAIL TO SOLDERSMOKE@YAHOO.COM   JUST SAY THAT YOU LISTENED TO PODCAST #218 AND TELL US HOW YOU LISTENED TO IT (ITUNES, DOWNLAD FROM BLOG, STITCHER, PODBEAN, WHATEVER...  THANKS

http://www.af4k.com/crystals.htm

TRGHS: Hearing K5HCT Through a Single 12AU7 Tube with 12 Volts on the Plate (Video)

The lower portion of the column on the right-hand side of this blog is where I put links to interesting blogs, YouTube channels, and web sites.  Yesterday one of the links there led me to the above video. It presents a regen receiver using one 12AU7 tube and a 12 volt power supply.   Wow! I have many of those tubes.  And at 12 volts I am unlikely to electrocute myself.  Count me in.  

In the final minute or so of the video, the builder tunes around the 40 meter phone band.  Suddenly I heard a familiar voice.  It wasn't recorded long enough for the callsign to be heard, but I was pretty sure it was our old friend August, K5HCT (Here Comes Texas) from Odessa. 

Odessa, Texas is a good skip distance from both California and Virginia, so Pete and I have both talked to August many times. When I was testing out new homebrew contraptions, August was often there to help me out.  

I was pretty sure it was August in the video.  I checked with Pete -- he too recognized the voice.  Then I got an e-mail response from August -- yea, it was him.  

On the air, I often recognize a voice before I hear a callsign.  In this case it happened via a somewhat wobbly regen and the internet.  

THE RADIO GODS HAVE SPOKEN. 

Now where did I leave those 12AU7s? 

VK3HN's AM Pulse Width Modulated Homebrew Transmitter

I'm still working on trying to match the excellent results Paul achieved with his AM receiver.  Then this morning I wake up to a Hack-A-Day article describing his even more impressive achievement with his AM transmitter.  

There was one line from the Hack-A-Day article that made me think of Pete Juliano: 

Younger hackers will note the Arduino Nano at the heart of the project, running the VFO and handling all the relevant transmit/receive switching. We can only imagine how welcome modern microcontrollers must have been to old hands at amateur radio, making synthesizing all manner of wild frequencies a cinch.

Indeed.  

And once again this story about Paul's AM operations has made me jealous of the obviously great AM homebrew culture that exists in Australia. 

FB Paul! 

PH2LB's Homebrew Hi-Per-Mite CW Filter in his uBITX

I really like the way Lex PH2LB measures and demonstrates the effectiveness of the Hi-Per-Mite CW filter designed by David Cripes NM0S.   Watch the short video above.  The blue trace is the audio input to the filter, the orange trace is the output.  Watch the output change as Lex sweeps the audio frequency range. 

He wrote: 

After studying the schematic I shifting through my spare parts stock to collected the components and build one according there design on a breadboard (I changed the center frequency from 700 to 600Hz).
I hooked up my signal generator with a amplitude of 2v max and sweeped it from 250Hz to 2KHz looking at the output on my rigol osciloscoop. On 2khz VMAX=0.04V, 885Hz=0.2V, 700Hz=1.5V, 662-585Hz=2V, 400Hz=0.2V, 500Hz=0.9V, 250Hz=0.04V. So a nice flat top between 585Hz to 662Hz.

A full description of Lex's project (with more videos) is here: 

https://www.ph2lb.nl/blog/index.php?page=ubitx-mods3#ubitx-mod14

Lex's Knack Story and the intro to his blog is here: https://www.ph2lb.nl/blog/index.php?page=history