Words of Wisdom for Homebrewers -- From Dave Metz, WA0AUQ

When you are done, be proud of what you have accomplished! Use it on the air and show it off to your friends an amaze them. Then clean the bench and start dreaming about your next project. 

David Metz, WA0AUQ

http://www.fpqrp.org/homebrew.html

Summary:

• Decide if its important to do
• Study the prior work of others
• Make a preliminary simple design, document everything you do!
• Round up your parts
• Build in modules! Make one module at a time work.
• Don't get discourage, ask questions, finish what you start

http://www.fpqrp.org/homebrew.html

There is a lot of tribal knowledge and homebrew wisdom in this link.  I tried to find a picture of OM Dave, but he has kept a low profile on the www.  The best I could come up with is a symbol of the club that he has been associated with.  Thanks Dave!

Here is the full document:
http://www.fpqrp.org/homebrew.html

Brazilian Minimalism: The Curruira Transmitter

Miguel PY2OHH is the Wizard of Sao Paulo. This morning I was looking at his wonderful web site and came across this little rig.  It seems a bit simpler than our beloved Michigan Mighty Mite.  And the folks down in Brazil had several of these on the air and made contacts with them.  FB.  Miguel hints they may turn this rig into a transceiver. 

Here is the Curruira:

http://py2ohh.w2c.com.br/trx/curruira/curruira.htm

 

 

The rig is named for this little bird: 

 

 

Gregory Charvat HAS THE KNACK

Gregory Charvat N8ZRY

Yesterday I was talking to Allen W5SQK on 17.  He mentioned that he been working in his shop. You don't hear that too often these days, so naturally I asked what he was working on.  Turns out that OM Allen is building a coffee can radar!   He is enrolled in the MIT Lincoln Lab's Open Courseware Project (which looks very cool).  We had a great QSO, sharing tales of woe about the release of magic smoke from (dis)integrated circuits.  These are the things that pull us together my friends!

 

On the MIT page the name of a faculty member caught my eye: Dr. Gregory Charvat N8ZRY. Greg's rigs have been discussed on this blog at least twice, but it wasn't until today that I became aware of his many other interesting technical activities.  

 

Videos: 

https://www.youtube.com/user/charvatg

 

Bio:
http://glcharvat.com/Dr._Gregory_L._Charvat_Projects/About.html

 

Greg's KNACK STORY:

http://glcharvat.com/website%20pdfs/Charvat_Interview_AEXmag_Oct2013.pdf

 

 

  

Turkish Knack

Mehmet making contact using a homebrew rig

Lots of great homebrew videos from MehmetTB5X:
https://www.youtube.com/user/pashanline/videos

And he has a really nice web site:
http://www.tb5x.com/
Google Chrome does a pretty good job translating from Turkish.

DL1DN's First Homebrew Contacts with a BITX40

FB!

Nightmare Turns Real: "Rig Here is a Raspberry Pi OM, and I'm listening to you with my Dongle..."

As with many other nightmarish things, this one was launched at the world on Halloween. It all seems a bit flaky, but we knew this was coming.  Don't complain to me about the lack of low-pass filters, SSB testing on 7.000 MHz,  or the rather nebulous identity of the creator.... I'm just the messenger here.  And remember that I am a HARDWARE Defined Radio,  Discrete Component,  "Menus are for Restaurants" and (now) "Pi's are for eating" kind of ham. 

Here it is:

http://www.rtl-sdr.com/transmitting-fm-am-ssb-sstv-and-fsq-with-just-a-raspberry-pi/

 

CB to 10 Conversion? The Radio Gods Seem Ambivilent

A lot of trouble can begin with a 5 dollar purchase, as I found out after I bought a nickel bag of CB at a hamfest. 

The embarrassing little Good Buddy appliance has been hidden away in my junkbox for a while.  I pulled it out after watching Pete's videos about the conversion of his Ten-Tec Model 150A commercial rig.  I thought perhaps I could use a little DDS or PLL board to bring that CB rig onto 10 or maybe even 12 meters.  

The first thing I noticed when I opened it up was the smell -- there was a very strong chemical electronic smell.  It was as if components and wires and adhesives and PC boards had been venting inside that case for several decades.  This wasn't that pleasant electronics smell that you get from a Drake 2B or a DX-100.  No, this was different.  It gave me a bit of headache.  That's a bad sign.   I began to wonder if the Radio Gods might be sending me a message. 

But then I found this very cool conversion site:
http://www.jcoffman.net/WB5RUA/10_meter_AM_conversion_w_Photos.html

Wow, a few snips, a few jumper wires on the PLL board, and a few coil tweaks and that thing would be on 10 meter AM.  I also learned that the "Cybernet" board that was stinking up my shack was VERY common in CB rigs, so there is a lot of info about it on the internet.  This thing seemed to be crying out for a quick and easy conversion to ham-dom.  

So I don't know which way to go with this one.  I'm getting contradictory signals from the Radio Gods.  What do you guys think?  Garbage can or workbench? 

Rocket Knack in the Congo

This guy clearly has a rocketry version of The Knack.  Busted by the police for a match-stick rocket at age 17,  Jean Patrice stuck with his dreams of a Congolese space program.  Years later, when the rat flying in one of his rockets crashed and burned, he declared that the varmint had "died for science."  Indeed he did.  That is what I said about the lizards and mice killed in the payload chamber of my Astron X-Ray Estes rocket during the late 1960's.  A moment of silence please...

Imagine how difficult it would be to make any progress on something like this in the Democratic Republic of the Congo.  Godspeed Jean-Patrice! 

http://www.wsj.com/articles/one-africans-personal-space-race-turns-vermin-into-astronauts-1446239060

De-mystifying a chip -- Looking inside the 741 Op-Amp

Inside a 741 op amp, showing the die. This is a TO-99 metal can package, with the top sawed off

This is really cool and potentially life-changing for radical fundamentalist ludite homebrewers.  As our readers will know, my big objection to the use of integrated circuit chips is the fact that these little black boxes are in fact often, well,  little black boxes.  We don't know what is going on in there.  It seems to me pointless to shy away from the use of large black boxes (the extremely complex "radios" that dominate the amateur airwaves today) only to fill our homebrew rigs with smaller black boxes. 

But when we crack one of these boxes open and take a look at the transistors, resistors, and capacitors formed on the substrate, then diagram it all out,  I think the fog of mystery is blown away by a refreshing wind of insight and understanding.  We saw this happen on a much smaller scale when someone cut open an SBL1 mixer, but that wasn't an IC.  Ken Shirriff has now done this with the venerable 741 Op Amp.  And he did it with a hack saw.  Bravo Ken.  I can now in good conscience uses 741 op amps in my rigs.    

http://www.righto.com/2015/10/inside-ubiquitous-741-op-amp-circuits.html

Listen to my BITX17 Signal as Heard in France

I was talking to Alan F5LIW on 17 meters yesterday and he was kind enough to record a bit of my transmission and then e-mail it to me.  So here is what my BITX 17 sounded like in Dijon, France. I had the BITX17 going into the CCI EB63A amplifier running at about 100 watts into my Moxon antenna.  Thanks Alan! 

http://soldersmoke.com/N2CQRF5LIW.mp3
 

Real DX: The Mysterious Flicker of KIC 846

Artist conception of a Dyson Sphere Alien Mega-structure

This story somehow seemed appropriate for Halloween.  But it is for real (this is Halloween, not April 1!). The role of amateur scientists in this matter is especially interesting, as is the radio-astronomy follow-up.  Stay tuned!

 

http://www.theatlantic.com/science/archive/2015/10/the-most-interesting-star-in-our-galaxy/410023/

http://www.sciencefriday.com/segments/the-mysterious-flicker-behind-star-kic-8462852/

http://www.seti.org/seti-institute/news/alien-engineering-around-strange-star

http://www.cnet.com/news/the-full-story-behind-the-alien-megastructures-scientists-may-have-found-but-probably-didnt/

Si5351 -- G4GXO says "Give it a go!"

Hi All,

 

Many of you will know of the low cost Si5351A programmable clock generator which can serve as a VFO with a remarkable range of 2.5kHz to 200MHz. This device is available from the larger industrial component suppliers such as RS for as little as £0.68 +VAT and is offered as a small PCB module with regulator and level converters from many amateur component suppliers for around £7.00. I bought a couple of the Adafruit modules to evaluate as the second conversion oscillator in a DSP IF system I’m developing and once I’d overcome the hurdle of writing the dsPIC33 software to drive the device I decided to test the unit as an HF VFO. My reason for doing this was to assess the phase noise of the si5351A; a quick Google will turn up many blogs and forum listings on this subject with mixed opinions of the suitability of this device for VFO service. With no direct method of measuring phase noise I decided to examine instead the impact of phase noise on receiver performance, after all it is this effect that will determine the suitability of the Si5351A as a VFO. My strategy was simple, I used the receiver section of my 60m SSB transceiver which is based upon the Eden IF (SPRAT 144) and uses one of the club 9MHz SSB filters. The front end mixer is a discrete diode ring made from two trifilar wound FT37-43 toroids and four 1N4148 silicon diodes. Unlike a schottky diode mixer this silicon switching diode version requires more drive to keep conversion loss down. The VFO is a low phase noise 7ppm Si570 running on the high side of the IF at 14MHz, a MMIC output stage delivers +10dBm of drive to the mixer. The Si5351A was compared directly to the Si570 – which is a known “very good” performer.

 

The test strategy was to measure the receiver Minimum Discernable Signal (MDS) at 5MHz with the Si570 and the Si5351A as the VFO. With no buffer stage to raise the 5dBm output of the Si5351A to match the +10dBm output of the Si570 VFO module, I accepted that this compromise would have some bearing on the results through increased mixer loss.

 

Results (14MHz oscillator drive, 2.2kHz IF bandwidth)

 

Si570  +10dBm output, MDS –122dBm  (Well below noise from the antenna, perfectly acceptable for 60m!)

 

Si5351A +5dBm output, MDS –118dBm (Note, mixer drive 5dBm down!)

 

Some if not most of the 4dB difference in MDS is without doubt attributable to the lower drive power of the Si5351A in my test configuration, this is borne out by the AGC threshold which moved up by 4dB suggesting increased mixer loss. I’m confident that had I been able to match the +10dBm output of the Si570 then it would have been a close match. My conclusion is that for HF at least the Si5351A is a very useful oscillator which is easily applied and can deliver good performance. If you had doubts about using this device at HF I hope that these results encourage you to give it a go!

 

73 Ron G4GXO

Haunted by the Gong (Ooooo that's Awesome!) Donald's Knack Story

Bill:

 

First off thanks for the wonderful podcast. I only just discovered it and I have loaded as far back as I can go on my Phone. I have been listening to it every waking moment. Though I fear that even at one or 2 a month no amount of commuting, dishwashing or bathroom cleaning will allow me to catch up with you. 

  I so identify with your idea of the Knack. I was forever taking things apart, my mom had to remove anything that could be used as a tool from her home for my first few years as even at age 2 I was into clocks, cabinets and basically anything that wasn't nailed down. Until your podcast I hadn't even heard of the International Geophysical Year, but discovered I missed it by only 3 months being born in March of 59. I do think though that those of us that were even a little knackish were encouraged on our way by the Space program. 

  Even though I grew up in Canada, I was riveted to the TV for every space launch, touch down or space walk. Many of my first memories are watching grainy broadcasts from Gemini and then on to Apollo. Even now I stayed up to watch the Mars rover land those few years ago. 

  Radio was always a special interest for me from the First Short wave radio I got from my grand father. I remember discovering WWV, BBC VOA and the Netherlands english language programming. This of course launched me into a frenzy of stringing wires higher and higher much to the chagrin of my parents. My poor dad that was an arts major didn't know what to think of me. 

  I'd always wanted to get in to ham radio but the code requirement held me back. My dyslexia kicked me really bad. I had the little tapes from radio shack and I'd work and work but got no where. So i resolved myself to just shortwave listening. 

  I was laughing when you talked about your relationship with Regenerative Radios as one of the first radio projects I built was the "Science Fair Globe Parol Regenerative Radio" From radio shack. Here is a link to the thing http://www.ohio.edu/people/postr/bapix/rsglobep.htm I still have it at my mom's house. The last time I put batteries in it it would at least get WWV. Which is no small feet when you realize I built it with one of those Weller Soldering Guns that you could reseal canned goods with. I'm sure if I opened it up now there'd be blobs of solder the size of Cicada's in there.  

  I was just listening to Episode 147 where you were talking about the All American 5 tube radio. I must have tore down 20 of those things as a kid. Your Right they were dangerous as anything you could get. Most of them the chassis was hot if the plug was in wrong and there wasn't like a fuse or any safety equipment in there to stop you from hurting yourself. Yes they were cheep and made so without a transformer, and all the tube heaters in series with the panel bulb for a bit of protection to prevent a surge on power up. But one other feature they had was that when they were originally produced there was still some DC mains power around and they would run if you put in the Plug the right way. My old electronics teacher claimed that you could run them off 3 45 volt batters on the Farm in a pinch. Though 19 40's battery technology I'm not sure if that was a practical solution. Though In High School that's what we had to learn. Learned to tune, debug and repair those puppies. 

  After high School I went into the phone company and later made my way as a lot of us Knackish people in to the computer/software industry. And low and behold after about 30 years they dropped the Code requirement and now living in the States I went out and finally got a license. 

  I just wish I had found your podcast sooner as I would have done things a little differently. However I have managed to do some serious kit building. I have built two TNC's, one for the beaglebone and one for the Pie. I have built one softrock receiver and another Softrock emsamble  RXTX that I'm just trying to figure out how to make work. I also built though it's not really a kit a Kx3 that is my main HF rig. 

  I thought I was really interested in the computer radio connection but wow when I see what you have done with the BITX and the manhattan build I'm thinking I want to build a rig that maybe I can run some JT65 or PSK31 on. I know what you mean about the Phone and SSB but right now stuck in the city of Chicago my antenna space is limited and i'm surrounded by power poles so I have a lot of noise no matter what I do. 

  One thing I need to talk to your buddy Pete as in the left over spare time I have, between work family and radio I'm trying to complete the BSC that I never did during my misspent youth. But I'm stuck at the final project. I need something that needs some code and could be written up as a research paper I keep thinking there has to be a radio project here somewhere. 

  Anyhow that's enough I'm sure you get lots of people with their stories but I thought a little of what I encountered might be interesting. I really appreciate the podcast love all the personal stories combined with the tech talk. Keep up the good work. I'm looking forward to getting current. 

   Donald L. Gover KC9ZMY

P.S. I have woken up twice as of late thinking I heard a Gong followed by "Oooo That's Awesome" Maybe I'm listening a little to much :) 

 

P.P.S  Again catching up on the podcasts though my podcast listening time is a little reduced as I bought your darn book that's very interesting! But I wanted to make sure that I did inform the Knackers Union, whom I believe that Steve Snort Solder Smith is the enforcement officer that I had already constructed my 40m low pass from 4 state QRP. I have provided photographic evidence of it's construction and promise not to QRP on 40M without it. 

 

 

Hardware Hacking by Nicolas Collins

David Cowhig WA1LBP and I are the only two Foreign Service officers to have also been 73 Magazine "Hambassadors" (impressive, right?).   David was covering Okinawa for 73 (and for Uncle Sam!) while I was doing the same in the Dominican Republic.  

Today David sent me a link to the book "Hardware Hacking" by Nicolas Collins:   http://www.nicolascollins.com/texts/originalhackingmanual.pdf

It is not exactly about ham radio, but there is a lot of electronic wisdom in Mr. Collins' book.  You folks will like it.  I especially liked the hand-drawn schematics -- this adds soul to the book. 

Nicolas Collins is an interesting fellow.  He is Profesor, Department of Sound, The School of the Art Institute of Chicago.
https://en.wikipedia.org/wiki/Nicolas_Collins

http://www.nicolascollins.com/read.htm
  

Ed Walker of "The Big Broadcast" at WAMU-FM

Ed Walker, the long-time host of "The Big Broadcast" on WAMU-FM in Washington DC passed away on Sunday night, a few hours after his final broadcast.  I was a regular listener. 

He obviously had an abiding love for radio.  His obituary in the Washington Post notes:

Born blind, Mr. Walker grew up with radio as his constant companion from an early age. By age 8, he was operating a low-power radio transmitter in his family’s basement, beaming music to his neighbors’ houses down the block. He would go on to spend almost all of his adult life involved in the medium in some way, all of it on stations in Washington.

Wow, sounds like he had the Knack.  I wonder if he ever had a ham radio license?

https://www.washingtonpost.com/entertainment/ed-walker-wamu-personality-who-burnished-radios-golden-age-dies-at-83/2015/10/26/373c905c-7be2-11e5-b575-d8dcfedb4ea1_story.html

HB2HB! AC9JQ -- N3FJZ on 40 with Homebrew Rigs

On Saturday October 24,  Dean AC9JQ (Indiana)  and Rick N3FJZ (Maryland) made contact on 40 meter SSB using Si5351/TIA BITX rigs.  FB!:

Bill:

Dean and I made contact.  We both were in and out most of the time, but conditions seemed to improve towards the end where I could understand Dean about 90%.  Using the RST "by the book", I would say he was a 33, 3 =(readable with some difficulty), and signal strength was 3=(weak), and based on what Dean was reporting, my signal back to him was the same - 33.

73 to you both.

Rick - N3FJZ.

HB2HB! AC9JQ and N2CQR Make Contact on 40 with Homebrew Rigs on Both Sides (with help from N3FJZ/HB)

This weekend brought another HB2HB (Homebrew to Homebrew) contact.   We have been following with interest the 40 meter transceiver project of Dean, AC9JQ.  Above you can watch a video of Dean's rig in action before it went into the box.  Earlier this month Dean achieved a remarkable "Double First" when he made his very first amateur radio contact.  He was using his homebrew rig to do it.  So his first contact was also his first homebrew contact.   FB. More info on Dean's rig and homebrew exploits can be seen here:
http://soldersmoke.blogspot.com/search?q=ac9jq 

This week Dean got a decent 40 meter dipole up in the air.  We arranged (via e-mail) to meet on 40 on Friday evening.  We made contact, but conditions weren't great.  We tried again several times on Saturday, looking for open spots amidst the madness of the CQ WW DX contest.  Rick N3FJZ joined us and also tried to make contact with Dean, but had no luck either.  Daytime conditions didn't allow for a good contact between Indiana and the Washington/Baltimore area where Rick and I are located. 

Finally, last night after family obligations at both ends settled down, Dean and I found a relatively open frequency on 40 and made a good contact.  A short snippet of it can be heard by clicking on the link below.   Keep in mind that Dean was running about 2 watts to a dipole on 40 at night.   

http://soldersmoke.com/HB2HBAC9JQ.mp3

Thanks Dean!  Thanks Rick!

German Thermatron Homebrew

Michael DF2OK has been melting solder in Germany.  Above is a short video of the first sounds made by an AC-1 replica he built.   Michael notes:  "Yeah, I love these old style radios. You can see nearly everything. :-)  BTW: All without Arduino and other black boxes and chips!"
FB Michael.

During the AC-1 build Michael struggled with a bad tube.  His discovery and resolution of the problem is presented in this video (understandable even to those who don't speak German):



Finally, here is a nice video of Michael's 40 meter regen receiver. Anyone who has built or worked with a regen will understand perfectly this video.  Watch Michael tune in stations while adjusting the regeneration.  Note his demonstration of the lack of hand capacitance. FB Michael!  Thanks!  

QST Error on Elecraft K3 Phase Noise Measurement CORRECTED

Wayne Burdick, N6KR, of Elecraft let us know that there was an error in the QST article about the KSYN3A Synthesizer Upgrade.  The original graph in the QST article showed an improvement in phase noise at close-in frequencies, but it also showed a significant worsening of the phase noise beyond 10 kHz.  THIS CHART WAS INCORRECT.    The Upgrade does, in fact, improve the phase noise performance as shown in the corrected graph above.  A corrected version of the article appears here:

    http://www.elecraft.com/K3/QST%20KSYN3A%20revised.pdf

 

Thanks for letting us know about this Wayne.  We have long been big fans of Elecraft and are proud that a picture of your KX3 appears on all of our blog pages under the headline "One of the Best Receivers in the World."

Pete and I will continue our study and discussion of phase noise;  as synthesizers make their way into more and more of our hombrew rigs it is important for us to understand the significance of this parameter.   

 

November 2015 QST -- Wrist Radios, Phase Noise, and a 1958 BITX!

A Early BITX

I liked this issue.  Highlights:

Page 30.  Glen Popiel's article on the Arduino.

Page 33.  I know this may come as a surprise, but in spite of my admitted Ludite tendencies, I found the article on High-Speed Wireless Networking to be very intriguing.   

Page 38.  Hey!  Mike Aiello N2HTT has an article about an Arduino-based CW recorder.  FB Mike!

Page 54.  Review of LNR LD-5 QRP Transceiver. "The LD-5 is actually an SDR in a box with switches and knobs..."  They give a phase noise graph.

Page 58.  Review of Synthesizer upgrade for the Elecraft K3.  Uh-oh.  Phase noise again.  The review says the upgrade results in a reduction of phase noise, but the graphs seem to show an increase in transmitted phase noise on 20 meters as soon as you go 10 kHz from the transmit frequency.  I guess this is a tradeoff for a larger decrease in close-in (less than 1 kHz spacing) phase noise?  But if the objective on the transmit side is to deal with "a major problem with multiple operators in the same band segment in close proximity" resulting from transmitted phase noise,  is this a good trade-off?   Also, it would  have been interesting to know if the reviewer could detect -- by ear -- any improvement in the received signal.  

Wayne Burdick, N6KR, of Elecraft e-mailed us to let us know that there was an error in this QST article.  The original graph in the article showed an improvement in phase noise at close-in frequencies, but it also showed a significant worsening of the phase noise beyond 10 kHz.  THIS CHART WAS INCORRECT.    The Upgrade does, in fact, improve the phase noise performance.  A corrected version of the article appears here:

    http://www.elecraft.com/K3/QST%20KSYN3A%20revised.pdf

 

Here is the corrected graph:

 

 

Page 71.  My nightmare.  The WristRig.  The Apple Watch on 40 meters.  Sorry Steve, Dick Tracey did not have The Knack, and tackling the "Apple Watch challenge" is not an indication of "homebrew chops."  Software coding chops yes, but homebrewing is, for me, a different thing.   (But, as we always say, too each his own... And thanks to Steve for the interesting article. )

Page 82.  Ross Hull.  Very interesting article, especially the part about OM Ross's untimely death by electrocution.

Page 100.  "The Cosmophones" by Joe Veras.  Cool pictures (as always) from Joe.  And I loved the first lines:  "What in the world is a bilateral transceiver?  Byron Goodman, W1DX, posed that question in his June 1958 QST review of  the Cosmophone 35."    Wow, four months before my birth By Goodman was writing about BITXs in QST!