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Wednesday, January 1, 2025
Happy New Year from the Dominican Republic! SKN from HI7/N2CQR
Tuesday, December 24, 2024
So Many Great Pictures, So Much Radio History
Monday, December 9, 2024
Listening to 40 meters on the DC Receiver -- And I Heard a Distinguished Homebrewer!
Thursday, September 19, 2024
AG5VG's Homebrew 20 meter Superhet (with a CW rig Coming) (Video)
Michael AG5VG finished this receiver last weekend. He hopes to build a CW transmitter using an output of the Si5351. Obviously I defer to Pete on that one. Good going Michael. I think it sounds great and looks even better.
Monday, September 16, 2024
"QRP Classics" The Book that Got Me Started in Homebrew
A question this morning from Scott KQ4AOP caused me to Google this old book On page 59 I found the article about my first transmitter. Someone has put a copy of the entire book on the interenet. Here it is:
Friday, September 6, 2024
Ham Radio in the 1970s (and earlier, with some cool Jazz). What favorite rigs do you see?
Thursday, May 16, 2024
A Light-beam QSO in Hollandia, Christmas 1944
Christmas, 1944
In a wartime world the singular and exclusive camaraderie that exists in the hobby of amateur radio results in so many unexpected and coincidental meetings between good friends, who have previously never seen each other, as to make such happenstance fairly commonplace. But I boast a tale in which time, place and circumstance combined to cause a similar occurrence to be most extraordinary.
The Liberty ship El Segundo Ruiz Belvis lay at anchor in the murky waters of Humbolt Bay, New Guinea, on a tepid tropical night in '44. In the absence of the moon, the Dipper and the Southern Cross scintillated bewitchingly. On the shore, the lights of the army base of Hollandia burned steadily in contrast to the varipowered signal blinkers which intermittently pieced the opaque darkness throughout the harbor. The latter were visual communication between ships and shore plus an admixture of ship-to-ship chatter, official and otherwise. There was an underlying tense tinge to the atmosphere and the stillness was broken only by the sharp staccato of the Belvis' blinker shutters as the signalman transacted port business with the powerful land station.
This was rendezvous. Our Liberty, with scores of army personnel aboard, had here become a unit in the formation of a huge convoy. Crammed into holds, on hatches and into every available nook and cranny of the steel deck, we were Leyte-bound. Stifled, sweaty and hungry on our two meals per day, we wore out deck after deck of pinochle cards and read every available piece of literature over and over again. It was almost a month since we had left Sansapor, scene of our last operation. We were exuberant in the knowledge that we were soon to leave New Guinea.
Christmas was but a few days away and we had had no mail for weeks. Men leaned languidly on the rail and thought of home while others dreamed of the same in their cramped quarters. The circumstances certainly made this Yuletide one to be long remembered. Nevertheless, all that would feature this day for us would be a possible piece of priceless turkey added to the usual dehydrated viands. Just another dragging equatorial day to be piled atop hundreds of others like it.
It was ten o'clock. I was wide awake; only my eyes were tired. Presently, I found myself detachedly reading the blinkers which poked their focused fingers indiscriminately about the bay. My quarters, in the cab of a 399, were on the port rail amidships and afforded a good view across the water. I became absorbed in various bits of chatter between nearby vessels. It struck me that QRM was quite heavy tonight—a sort of an optical 80 meters. I saw one of the lights sign off with a "73." This was interesting as among the host of merchant marine signalmen, hams are spread pretty thinly. I seized my M-1 torch and focused an insipid beam in the direction of that ship. I sent CQ CQ CQ K. A ham call sign is a cumbersome thing to handle with a blinker. Furthermore, I had no faith in the DX powers of my 3-volt flashlight bulb. I was therefore elated when a bright interrogatory sign beamed forth, aimed obviously in my direction. Contact! True, it was outside the hambands, but band divisions in the microwave region are indefinite anyway.
I was still dubious as to whether my man was an amateur. Rather than complicate matters immediately, at this speed of 8 words per minute, I began in the language of the layman: HELLO PAL WHERE YOU FROM? K. Back in an agreeably rhythmic style came: R TULSA OKLA NAME IS HAL K. The given name and place struck a subconscious inner chord vaguely. Next, I blinked: GE HAL IM ROD FROM CHGO K. There was a pause. He reoriented his beam to compensate for tidal drift and then startled me with: W9BRD DE W5EGA K.
The night quickly took on an exhilarant aspect as we lapsed into ham vernacular, spiced with many Morse slaps on the back. Hal Frank was no other than an old c.w. crony of mine. We had heckled each other on 80, 40 and 20 a countless number of times in the prewar days. In memory I was hearing again that beautiful swing and T9X sledge-hammer signal off his three-element rotary. We discovered mutual ham friends and we exchanged much welcome information and recounted bygone days. He was quite amazed to learn that I was behind a mere GI flashlight (with low batteries at that). The QSO continued far into the night—the next and the next.
We seemed destined to rot in our anchorage. The convoy movement was postponed from day to day. However, this Christmas season took on a much different aspect for me as arrangements were made and, at 0900 Christmas Day, my friend, Wilbur Kuure, W9YNY, and I debarked unsteadily down the ladder and made our way across an undulating swell to the Liberty ship Chittenden. There, we met Lt. Hal Frank, W5EGA, personally, for the first time. We all agreed that it was quite a small and bizarre world that December 25th.
Verbal reminiscences cluttered the air within W5EGA's exceedingly neat cabin for several hours. Shelves in his quarters were lined with excellent reading material including many late QSTs. Compared to our situation aboard the Belvis, Kuure and I thought this a bit of heaven.
We were thoroughly acquainted by the time we appeared in the officers' mess. As the cuisine took shape before us and disappeared into our eager gullets, my army pal and I felt somewhat sorry for our less fortunate buddies on the home ship. But such is life. We had, in nautical terms, a "Little Roundhouse," consisting of a generous helping of everything on the menu. We swept our plates clean to Hal's amusement. I remember, most distinctly, the dessert of apple pie and ice cream.
Nightfall found Kuure and me "back to earth" on the Belvis after a most delightful Christmas Day. According to plan, we blinked a "goodnight and thank you" to W5EGA through the twilight. That was our last QSO of that series. Not long after that we weighed anchor and headed for our next stop on the long road back home. Our holiday was over, a new year had begun and there was still a war to be won.
From S/Sgt. R. H. Newkirk, W9BRD, "Christmas, 1944" QST, January 1946, pages 25 and 102. |
Saturday, May 11, 2024
Helge SM/LA6NCA Activates Colorburst Liberation Army in Sweden!
Saturday, May 4, 2024
W4YWA's Homebrew Rig on 20 Meters
Ed W4YWA is far too modest -- he has built a very FB homewbrew transmitter. Congratulations Ed. I think your original plan to use a Web SDR receiver will work, if you and the other station are just willing to pause for an additional second or two to let the internet catch up with the real world. Also, you might find some Web SDRs that have less latency than other. You could used a little SW receiver or a simple buzzer for your sidetone ( I think sidetone is your most pressing latency concern.) My suggestion is to try to get a few contacts using the Web SDR (perhaps via schedule -- try the DX Summit or the SKCC web page to set some up). Then build yourself a simple Direct Conversion receiver to use with this rig. You don't have to try to build a VFO at 14 MHz (that can be difficult) -- you could build one at 7 MHz (use the circuit from our High School receiver project) and pair it up with a "Subharmonic Mixer" so that you can tune the 20 meter band. Please keep us posted on your progress.
Ed writes:
Home-Brew Fun and Failures
Wednesday, May 1, 2024
KE5HPY Builds a QRP Transmitter
Thought you would appreciate a recent project inspired by the fabulous EMRFD. This started as a test bed W7ZOI universal tx to evaluate my stock of RF BJTs and employ some FT-243s in the shack. That was interesting by itself but the 16-32 dBm output (choice of device really matters!) did not reach the intended targets using my 40m dipole. So, add a W7EL RF PA and a nifty, clean 7W emerges after damping output from Q2. The final is pleasantly efficient and needs only a modest heatsink to survive key down for 60 seconds. KFS then reported S7-9. Success. Time to box it up and go XTO, add a meter output at 30dB down and an RF driven LED indicator. Left room to add an ATtiny85 CQ keyer but ran out of time. Had to move house and knock down my 40-6m antennas. That was the most painful part of moving. So this rig sits while I find a new place to hang antennas. Eventually, the TX will get a RX mate when it is possible to box up a 40m DC RX with Si5751 and OLED display. Am still trying to solve how to mount an OLED display cleanly in an aluminum box. First, I have to reconstruct my workbench.
Keep up your good work, and that is no April Fool’s joke.
73,
Chuck KE5HPY
Sunday, April 21, 2024
The War of the Worlds -- In CW -- By Chuck Adams AA7FO
This is for CW fans, or for those wishing to improve their CW skills. You can now listen to the entire H.G. Wells book in CW, thanks to Chuck Adams, AA7FO.
This seems very timely becasue my son and I are watching the NETFLIX version of "The Three Body Problem" by Cixin Liu. This deals with an entirely different war of the worlds.
Check out Chuck's CW version of the book. Thanks Chuck!
Sunday, April 7, 2024
Another CW Contact with the SupeRX/TX 40 (Video)
Thursday, April 4, 2024
MXM SupeRX/TX 40 Rig Info
Click on schematics for a better view
Friday, March 29, 2024
A QRP CW Contact (Video) with the Winterfest MXM SupeRX/TX 40 (1 Watt, Crystal Controlled Transmitter)
I picked this transceiver up at Winterfest for one dollar. 40 meters. Superhet receiver with 455 kc ceramic filter and 2 NE602s. Crystal controlled one watt transmitter on 7039.5 kc. I emailed Jeff KA2BKG and asked him to slide up a bit to my freq. I am glad he did. Thanks Jeff.
Monday, March 18, 2024
Listen to me talking to Jean Shepherd in 1976. I was 18 years-old.
http://soldersmoke.com/JeanShepherd1976WMCA.mp3
One side note. I told my wife that some time after the broadcast, I was once again up early in the morning, kind of absent-mindedly getting ready for work when I heard Shepherd talking on WMCA to some guy about ham radio. It took me a moment to realize that this was a re-run, and that that guy was me!
When I first listened to this I didn't realize that later in the recording (around 9:30) another fellow calls in an asks Shep about why he uses CW. Shep is kind of short with him and ends up advising him to "go back to CB." I should note that in my conversation with Shep earlier in the program, I told him that I was usually on "40 sideband." He was nice to me, but said that he was mostly on 20 CW.
Wednesday, February 14, 2024
We Get Mail! Red Poster? Really a Tapestry from Ecuador
Listener Tobias was laid up yesterday, following the extraction of wisdom teeth. (This seems like an appropriate follow-up to our talk in SolderSmoke Podcast #250 of sBITX "wisdom files" to correct FFT "hallucinations.") Tobias does not appear to have been hallucinating, but he was having trouble seeing what he thought to be a "red poster" in my shack.
In fact, what he was seeing was a red tapestry from Ecuador that was sent to me by Galo Constante HC1GC way back in 1993. I was in the Dominican Republic, running my first ever real homebrew transmitter. Here is an article about this project: https://www.gadgeteer.us/TXHB.HTM I think Galo was also QRP homebrew. My log shows that I worked him eight times from the DR.
Mitad del Mundo = Middle of the World (a reference to the equator).
Here is the QSL I got from Galo:
Monday, January 1, 2024
Happy New Year! Straight Key Night at N2CQR (video)
Happy New Year to all. May you make good progress on your homebrew projects, and may the radio gods act favorably on your behalf.
73 es HNY de N2CQR
Tuesday, October 10, 2023
A Low-Power (QRP) Contact from Australia to Spain (with video from both sides!)
Wednesday, June 14, 2023
Nine Homebrew Transceivers by Walter KA4KXX (and some QRP and QRO RC planes)
I
tried a Si5351 VFO once in the dual-band rig #4, but by the time I built the
QRP Labs kit with so much closely-spaced soldering, and then added
sufficient filtering and amplification to properly drive a 50 ohm load, I
was exhausted!
These nine were created during the past eight years, and
were preceded by eight more transceivers that I can document, but those have
all been disassembled, with many of the parts being used in these later
rigs. I build my transceivers to be
operated often, and since 20 Meters has been hot lately, for example, my POTA
Hunter log shows over 300 CW and SSB contacts in 2023 alone, so rig numbers 7 -
9 have been earning their keep lately.
In summary I have created a lifetime total of seventeen transceivers so far, and although I am nowhere near the fifty-plus tally of Pete N6QW, I did spend a lot of years instead homebrewing many radio-controlled model airplanes of my own design. Two photos show one example that I flew in the 2011 Blue Max Scale R/C Contest at the Fantasy of Flight Museum in Polk City, Florida against some stiff QRO competition.
—Walter KA4KXX
Thursday, June 1, 2023
George Heron N2APB talks about Coherent CW at FDIM: Interview #7 by Bob Crane W8SX
It was great to hear George's voice again. I was a big fan of his "Chat with the Designers" podcast. And it was great to see that Pete Eaton WB9FLW (an old friend of SolderSmoke) was also involved in this presentation.
At FDIM George was talking about Coherent CW. Now, my views on CW have been made quite clear, but I am going to deliberately avoid snide comments about how Coherent CW might be a contradiction in terms. Thank you. I think this is something that Pete N6QW and I can agree on.
Nevertheless, this is all technically interesting. This reminds me of what happens with WSPR. But I wasn't quite sure what George was getting at with his discussion of the phase of the incoming signal -- I can see the need to get the receivers' narrow filter exactly on the transmitting station's frequency, but why the phase?
Here is Bob Crane's interview with George:
http://soldersmoke.com/N2APB23.mp3
And here are a couple of things with background info on CCW.
https://www.sigidwiki.com/wiki/Coherent_CW
http://www.arrl.org/files/file/Technology/tis/info/pdf/7509026.pdf
Thanks George, thanks Pete, and thanks Bob.