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Saturday, November 21, 2015

SolderSmoke Podcast 182: Bears! MMM Update, On Pete's Bench, 160 AM Dreams, MAILBAG


20151116_091050[1]
N6QW Selfie
SolderSmoke Podcast #182 is available


Travelogue:  In Shenandoah with BEARS!

Michigan Mighty Mite Update and a Generous Offer (with conditions).

BENCH REPORT:
-- Pete's Ten Tec Conversion using LTSpice
-- Pete's Simple-ceiver
-- My CB to 10 conversion plans

DREAMS OF 160 METER AM:   KB3SII, N2CQR, N6QW Building for Top Band

Raspberry Pi Nightmares

Homebrew to Homebrew (HB2HB) Contacts

Elser Mathes Cup -- We have some competition!

QST, "The Radio Art,"  and The Channelization of HF Bands

WA5BDU Nick Kennedy on QSO Today  Podcast

Ed Walker of "The Big Broadcast" was a ham:  N3HFT

MAILBAG:  A Letter from Turkey: Tubes and R-390s
Si5351:  G4GXO says give it a go!


Thursday, November 19, 2015

Listening UP for KIC 846


How's SETI's investigation of peculiar star KIC 846 2852 going? @EricCMack checks in https://t.co/4roQ7nbDk9



Since October 16, the SETI institute has been using its Allen Telescope Array to observe KIC 846 2852 over a wide range of radio frequencies (1 to 10 GHz), looking for any artificial signals. Keep in mind that this star system is relatively far, roughly 1400 light-years away. That's more distant than the Orion Nebula, and getting there (if you feel the need) would require a 23 million year ride in our fastest rocket. But more to the point, any signals detectable here on Earth would have to be exceptionally powerful.
We're continuing to analyze the data. In another week, our SETI team will once again observe KIC 846 2852 using some new receivers being affixed to the Allen Array - known as Antonio feeds - that will increase the sensitivity by a factor of two. Check this space.
Meanwhile, consider KIC 846 2852 as something suggestive of cosmic company, but no more than a suggestion.

Wednesday, November 18, 2015

Pete's Suggestion for My Next Rig

8 FET Class E Rig made by Steve, WA1QIX
 
 
OR THIS:
 
The Class E rig is very tempting.  But no way on the ebay!  Too much of an appliance -- it even looks like a refrigerator.

Tuesday, November 17, 2015

AM Madness: Just When You Thought It Couldn't Get any Cooler...


I pulled an old Eico 435 'scope out of retirement.  I hope to use it as a modulation monitor (any suggestions on easy ways to hook it up for this purpose?).  I really like the grey and aluminum look of this station.  I tried putting a DX-60 on the same bench, but the green of the "modern" Heathkit clashed with the serious-radio look of the DX-100 and HQ-100. Thanks again to Tim Sutton for the aluminum boxes -- I am temporarily using them as supports for the D-104 and the 'scope.  You see, I'm standing up when I modulate this gear.  Somehow it seems right.  Also, the transmissions on AM are so long that you can go back to your chair and rest (a lot!) between your transmissions.  When your turn comes, the few seconds it takes you to get to the rig provide the customary (and polite) "dragging of the feet" that allows others on the frequency to announce their presence.  Then comes what is perhaps the most fun part of this setup: the AWESOME KERCHUNK sound of the DX-100 going from receive to transmit.  As you can see, we pay a lot of attention to aesthetics and radio ergonomics here at SolderSmoke HQ.  That little blue recipe box holds my AM contact card file from the 1996-2000 period of operations from Northern Virginia.

I'm planning on doing a little work on the DX-100.   There is a standard set of mods to the audio amplifiers, mostly just changing some caps. And I need to find out why some of the crystals are not working -- I suspect dirty contacts.   I might also change the mic connector.  Looking ahead, Steve Silverman KB3SII (SolderSmoke Lex-pert), Pete Juliano N6QW and I have vague plans for an assault on 160 meter AM.  

Over the weekend this rig yielded a number of really FB contacts. Brett N2DTS in South Jersey was running an amazing homebrew station:


Sunday, November 15, 2015

And Now for Something Completely Different: Boatanchors! AM! Top Band!


Lately  I found myself looking for something different to get involved in.  Pete's conversion of his Ten-Tec commercial rig got me thinking about converting an old CB rig to 10 meter AM.  I'm still planning on doing this, but noodling on this project got me thinking about AM in general.  I had the DX-100 that John Zaruba K2ZA had given me (it was his dad's).  I had it paired up with an old HQ-100 that I'd picked up in the Dominican Republic 20 years ago. (Looking at the old manual for this receiver, I realized that there is another reason why I feel so connected to it:  it was built on West 34th St. in New York City, not far from where I was born.)   On Veterans Day (November 11) I connected these two old Boatanchor veterans  to my 40 meter dipole, rigged up a connector for my Astatic D-104, and fired up on 40 meter AM. 

I had a blast!  I found myself in contact with hams who are interested in the inner workings of their gear, guys who know which end of the soldering iron to grab.  The DX-100 got great reports -- people said it sounded nice. 

Sam K4NDY told me that his DX-100 had started out at 100 pounds, but that as time passed (and as he has gotten older) he noticed that it has somehow increased in weight!   

Bill K8DBN was running a DX-60 and (like me) an HQ-100 (you see, we're no longer in Yaesu-Icom-Kenwood land!)

Mike KC2KJ was running a DX-100 and a Drake 2B.  FB!

Steve W3DEF was on with his B&W 5100B.

Dave W3CRA was on from the Collins Radio Association.  He restores Collins gear.  When he told me the DX-100 sounded great, I knew that it really did.

Today I talked to Ed KA3PTX who has this really cool Boatanchor station:
And also today I had a great contact with Howard Mills W3HM, one of the greats in the world of radio restoration.  Another fellow on frequency asked me to makes some critical comments  on Howard's signal quality ("Does he have too much low frequency?") -- I refused, saying I was unworthy. (I did say that he sounded great -- he did.)

Anyway, I'm out of the rut. An added benefit is that this new (old) interest moves me even further away from microscopic SDR rigs, and closer than ever to the Hardware Defined, analog, discrete component, menu-free radio that I prefer.  Check out the full schematic of a DX-100 -- simplicity, clarity, beauty:  

I had been thinking vaguely about someday getting on 160 meters -- I've never used those frequencies.   Yesterday I noticed that both the HQ-100 and the DX-100 cover this band.  THE RADIO GODS HAVE SPOKEN!

Saturday, November 14, 2015

W2DLH's 20 meter Mighty Mite



N2CQR & N6QW,
 
I ran across a reference to the SolderSmoke book and read through it very quickly.  Through the book, I discovered the SolderSmoke podcast and have been enjoying every minute!
 
I just want to thank the two of you for the inspiration and new motivation I’ve found in a hobby I’ve loved for 25 years!  I’ve never tried homebrewing anything but that’s about to change.
 
It took me a while but we have oscillations on or about 14.060 MHz!
I adjusted the circuit to use resistor divider biasing of the 2N2219 and changes to the biasing and coil to accommodate the 20m crystal. Also the only cap I had that worked was a 10-50pF trimmer. Aside from my placing the crystal in the wrong point in the circuit because I wasn't paying attention, this Michigan Mighty Mite needed minimal tweeting. The antenna is a 50 ohm resistor which the KX3 heard very well with its attenuator in line. 
 
Now my problem is that I listen to SolderSmoke in the car and it's bad form to take notes and drive at the same time. Also, I find myself wanting to experiment with all of the ideas from the podcast at once...  If I build your LBS in modules, Pete, then I can experiment later and swap circuits to my hearts content.
 
One question for now...where is a good source of plentiful, inexpensive crystals?
 
Thanks again, guys!
 
Darryl Hambly, W2DLH
- - - - - - - -
Grid DM78pu
G-QRP 15014
QRP ARCI 15138
SKCC 10990
- - - - - - - -
http://www.qrz.com/db/W2DLH

Friday, November 13, 2015

Waco Mighty Mite Mojo!



Eric:  Wow, great news from Waco.  JOO indeed!  And I really liked the WAY you did it, liberating crystals and wire from old TVs.   That definitely adds mojo to the Waco M^3.  Bill
 
Hello Bill,
  My name is Eric Melling KD0OXY. I have, as of tonight, officially passed selection for the CLA. My Michigan Mighty Mite began oscillating tonight between 1830 and 1900 CST and I am ecstatic about it! My foray into home brewing began mid-2011 when I obtained my general class ham license (I took Technician and General at the same time taking advice from my late grandfather). The first radio I ever purchased was the Pixie II kit and boy was that frustrating. I meticulously assembled the kit and worked very hard to stuff the transceiver, volume control, options to use the on-board key or a straight key, and maybe an on-board speaker or phones.  But, to my chagrin, I was treated to the sweet wafting smell of the magic smoke long before ever getting on the air. I eventually did get on the air with my aforementioned grandfather's VHF/UHF HT and until recently, this has been the extent of my Ham career.
 
  But on the advent of my starting an MA in applied linguistics at a school in Dallas (hour and a half from home in Waco) and the rekindling of my electronics knack occurring near- simultaneously with my discovery of the SolderSmoke Podcast, I decided to give it another go. First, I got the old pixie kit to oscillate and then ripped it apart for parts to another project (non-radio). Then I procured a second Pixie kit from ebay and built that. It oscillated right away! Still no contacts; my CW is... improving.
 
  All this to say that I still had an itch that wanted scratching Enter: The Color Burst Liberation Army! Not only could I truly build something from scratch, I could follow my true calling and de oppresso liber some crystal. So I pulled some 30 (or so) gauge magnet wire from an old CRT. I had wound and rewound my coil three times (and unfortunately, the third one looks the worst) for 80m then 20m (far fewer turns) and back to 80m with N'JOO (No Joy of Oscillation) in any configuration. I am using a polyvaricon pulled form an old AM/FM transistor radio, the Mitsumi PVC-2FX which has 82 pF, 140 pF,  20 and  40 pF sections which I have wired in parallel giving me ~0-282 pF of range? And finally, I was using a MPS A42 NPN transistor. I had to run some resistors in parallel and some caps in series to get the right values, but I eventually got it all together and looking pretty smart on a 1" x 1.5" piece of perf board. Alas! Nothing!
 
  I was poking around at the circuit and realized that when I keyed the transmitter, the coil would get really hot right at the tap. I still don't know why that was, but I figured it was a good sign as it meant something was happening. I also was getting plenty of pops and clicks on the receiver. Anyway, to make a short story long, I decided that the dark mark under the transistor was a bad sign, found an NTE 123 and plugged it in instead. And oh what a wonderful day to hear the first warblings of my very first all scratch built transmitter hitting the airwaves! And here is the video: https://youtu.be/yq2M1ryMkII
  
  Probably more than you wanted to hear, but there it is. I do plan to build an SSB transceiver someday (hoping sooner than later). I feel you and Pete and your podcast have really set me out on the right foot! I hope to HB2HB with you soon!

  Sincerely,
    Eric KD0OXY

Thursday, November 12, 2015

Psst... I know a guy with some caps.... Variable caps... Real beauties.... But only for Mighty Mites.


Feast your eyes my friends.   That is 400 micro-microfarads of variable capacitance.  (400 picofarads for you sophisticated young folks.)   A benefactor interested in expanding the ranks of the Color-Burst Liberation Army has stepped forward to make us an offer that is hard to resist:  He will send ELIGIBLE recipients one each of these fine electronic components for the cost of postage (approximately 6 bucks in the USA). 

He has specified that ELIGIBILITY is limited to those who need this part to build or complete a Michigan Mighty Mite.   And I have been appointed "Grand Poobah and Chief Arbiter of Capacitor Eligibility." 

So here is the deal:  Send me an e-mail telling me about your planned or stalled Michigan Mighty Mite project.  Include some information about your personal "Knack Story"  -- tell us why you share in this strange compulsion to build a largely useless 250 mW 3.579 MHz oscillator.   If I find your plans believable and your Knack Story compelling,  I will recommend you for a capacitor.  Purely aspirational MMM projects and obviously fabricated Knack Stories will not make the cut.

Supplies are limited, so act now! 

Wednesday, November 11, 2015

Stuart AC9LZ's Mighty Mite



FB Stuart!  Great work.  Pete is sending you info on a Low Pass filter that will clean up that harmonic-rich signal. 

Tuesday, November 10, 2015

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. 

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


Monday, November 9, 2015

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:

 
 
The rig is named for this little bird: 
 
 

Sunday, November 8, 2015

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: 
 
 
Greg's KNACK STORY:
 
 
  

Saturday, November 7, 2015

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.

Thursday, November 5, 2015

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:
 

Wednesday, November 4, 2015

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? 




Tuesday, November 3, 2015

Rocket Knack in the Congo


Ground control for Mr. Keka’s space program is a shed with a tin roof. Inside are old computers and televisions.

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

Monday, November 2, 2015

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
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

Sunday, November 1, 2015

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
 

Saturday, October 31, 2015

Real DX: The Mysterious Flicker of KIC 846


Artist's conception of a Dyson Sphere. Image Credit: Kevin Gill via Flickr CC By SA 2.0
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!
 




Friday, October 30, 2015

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

Thursday, October 29, 2015

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. 
 
 

Wednesday, October 28, 2015

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
  

Tuesday, October 27, 2015

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?

Monday, October 26, 2015

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.

Sunday, October 25, 2015

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!

Saturday, October 24, 2015

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!  



Friday, October 23, 2015

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:
 
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.   

 

Thursday, October 22, 2015

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:
 
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!

Tuesday, October 20, 2015

Homebrew Computers -- REALLY Homebrew Computers


Hackaday has an article today that is, for me, very timely.   In our last podcast, Pete and I were discussing the meaning of the word "homebrew" in the world of Software Defined Radio.  As always, Pete was closer to the cutting edge, while I remain mired in Ludite (one D please!) curmudgeonism, committed to RADICAL FUNDAMENTALIST HOMEBREWING.  No chips and no menus for me please.  

Today, the Hackaday guys came to my rescue with a blast from the past.  Homebrew computers!  Not that simple "buy a mo-bo and plug in some boards" stuff.   No, REAL homebrew, so HB that they even made their own components.  1968.  I can dig it!  I should have gone down this road.  I had the C.L. Stong book "The Amateur Scientist" IN MY HANDS. It had some great articles about relay-based computers.  I could have been rich! 

http://hackaday.com/2015/10/19/diy-computer-1968-style/

Sunday, October 18, 2015

HB2HB! N3FJZ-N2CQR Si5351 and BITX TIAs on Both Sides, with Some LBS and Peter Parker Circuitry Too!



In those dark days of February 2015, when all the members of the SDR ESSB Panoramic Spectral Police were on my case over some imperfections in my 40 meter homebrew SSB signal, Rick, N3FJZ came to my rescue by sending me a great YouTube video of his reception of my new rig.  Rick was using a wonderful homebrew Direct Conversion receiver with a really cool PTO.   Here is my blog post on Rick and his receiver:

Then, yesterday, I received this e-mail:


Bill, Pete,

I want to share my excitement with you.

After 32 years as a ham, I finally had my first ever HF QSO on October
16, 2015, and on a homebrew rig no less!  Oh the Joy of Emission!
It was on 7.242MHz, 8:00 a.m. eastern on the "Woodpecker net".
- Rig was based on the Bitx, using ZIA bidirectional amps.
- 20 Watts into a 80 meter full-wave loop up at 20 feet.
- 600 ohm homebrew open wire ladder line.
- Balanced antenna coupler inspired by the Annecke and Johnson matchbox
units.
- and most importantly, the Arduino controller software and use of the
Nokia display were derived and inspired from Pete's "Let's Build
Something" code presented on his website, and the carrier
oscillator(BFO) & L.O. are generated by an Adafruit SI5351 clock
generator board.  Thank you Pete.

See my N3FJZ look-up on QRZ.com for photos of my homebrew rig. I have
also put links to the SolderSmoke blog and to Pete's web page and blog.

I just want to tell you both that your podcasts, websites, circuit
diagrams and stories were a huge part of my success.  They were the
inspiration I needed on many dark days when my amplifiers would
oscillate, and my oscillators would simply smoke.  At times I thought I
would never get on the air, but an hour listening to SolderSmoke podcast
would give me the drive venture on.  Thank you!

***VERY IMPORTANT!!!!

Bill, during my first QSO, I was getting 5x8 and 5x9 signal reports
(with 20 watts!)from North Carolina, up-state New York, Michigan, and
Indiana, and I know we are only about 50 miles apart (I'm in north
central Maryland), so I believe we could probably achieve a successful
HB2HB contact if you want to try.

If you want to, and have the time, you could join me on the Woodpecker
net any Friday, Saturday or Sunday on 40 meters 7.242MHz 8:00 a.m.
eastern, or we could set-up a prearranged contact on a General class 40
meter frequency of your choosing.  Let me know - making an HB2HB
contact with you would mean the world to me.

Pete, I also extend this invitation to you as well, but with only 20
watts on my end, it may be a stretch, but we could try.

Thank you both again for the joy you have given me with your pod-casts.
73
Rick - N3FJZ
.................

Rick and I got together on 7.288 MHz yesterday evening.  It was a really amazing QSO.  Rick made a video of it (see above) and I recorded the audio on my side.  My old tape recorder didn't do Rick's signal justice -- it sounded better than this.  But here is the full QSO:


Be sure to listen closely at around 21 minutes when Rick describes a software feature that allows him to switch -- with the touch of a button -- from high side VFO to low side VFO.  The BFO frequency also changes to account for the resulting sideband inversion.  Very cool.

Rick's Digital Board

Ricks Rig as it was during our QSO
 
Crystal Filter

Rick's Dual HEXFET Power Amplifier
 
Check out the N3FJZ QRZ.com page for more info. 
 
CONGRATULATIONS TO RICK!  


Saturday, October 17, 2015

SolderSmoke Podcast #181 Of Dongles and DX-100s -- SDR vs. HDR, Music & Art, 2B, HB2HB, Noise, The Martian, VK3YE's New Book



Two RTL SDR Dongles in front of a DX-100 Transmitter

SolderSmoke Podcast #181 is available:


17 October 2015

-- Our audience IGNORES Pete's guitar intro!
-- Pete on QSO Today Podcast.
-- Part 97, The Radio Art and International Goodwill.
BENCH REPORTS:
-- Pete connects his new beam to the KX3.
-- Pete puts the Bell-thorn on 20.
-- Simple-ceiver update.
-- Pete's new drum machine: http://makezine.com/2015/10/15/learn-electronics-worlds-oldest-drum-machine/
-- Bill fights noise in the DIGI-TIA.
-- Bill fights power-line noise (and wins!).
-- Drake 2B, skirts, reduction drives, and tuning rates.
-- Warming up (with!) the DX-100.

-- N2CQR -- N6QW  First Ever HB2HB QSO.

-- On 40 AM with an HT-37
-- Listening to Chinese CubeSats.
-- SDR Dongle as a bandwidth checker.

-- SDR and the Future of Homebrew Radio.

-- Bryan's LBS Receiver.
-- Dean's First Ever QSO with his HB rig.

-- 32 Mighty Mites Completed

-- The Martian -- Did Mark Watney REALLY have the Knack?

-- MAILBAG:
Peter Parker's New Book
Sparks from Ron Sparks
Armand's 1Watter
Rogier's  pyro machine
BIG boxes from Tim KI6BGE
Mikele's ZIA and N6QW rig collection
SPRAT 141 and SPRAT 164

Friday, October 16, 2015

Dean's TIA Transceiver with Si5351 (Video)



Nice work Dean!  With this rig, Dean recently had his first ever ham QSO.  FB OM.
Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column