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Showing posts with label Old radio. Show all posts
Showing posts with label Old radio. Show all posts

Saturday, September 3, 2022

Where Do You Think This Variable Capacitor Came From? What Piece of Gear Did it Come out of? Is it in the Old Catalogs?

 

In an effort to stop the slaughter of innocent Heath QF-1s (for their very nice variable capacitors), I bought this thing on e-bay.  Here is the info I have: 

I checked the resonance of the cap and the coil:   It tunes from about 10.140 MHz to about 13 MHz.   The cap is nice -- brass vanes and with the linear tuning shape.  I don't know about it being from a Hartley oscillator -- no signs of a tickler coil.  There seems to be some sort of a pass-through cap from "Faradon" of Camden N.J.  

Update: 
It tunes from about 9 to 138 pf. The coil that it had on the back of the cap is about 1.6 uH and is tapped (Hartley style). The capacitor is marked on the back: "Licensed Under Pats. MC 15257781258423"


From the e-bay ad: 

"Here's a great project part.  These were likely a VFO assembly for some RF equipment from the late 1920's or 30's.  Essentially it's 4" Type A Velvet Vernier dial (standard 5:1 reduction drive) with a variable capacitor.  The variable condenser is a high quality ceramic frame with brass plates and looks suspiciously like a General Radio house part (also in Cambridge at that time). The variable condenser looks like a SLF shape or similar, about 135pF.  It has a ceramic frame and has an insulated shaft, which was critical to keeping hand capacity down back then.  It appears to be wired for a Hartley oscillator, probably 10 MHz+ give or take (not measured).

The vernier is in excellent condition--smooth, without backlash or sticking.  There are no chips in the skirt and the numbers and nice and clear--these were obviously well cared for over the years.  They have the the hard-to-find dial markers!

There is a rigid metal panel to which the vernier assembly is attached, and this in turn supports the condenser frame.  I suppose you could just that in a project box with an appropriate sized hole for the shaft and have an instant shielded enclosure for a VFO, or maybe screw it to the side of a breadboard.  You can also remove the vernier assembly from the panel and use it separately (e.g., to fix up an old NBD).  Lots of possibilities.  

There is a loose sheet-metal collar behind the rigid panel that friction-fit a (now missing) can that went over the whole assembly. It's easy enough to unscrew the front and remove this piece.  Everything comes apart if you want, including the unobtainium dial pointer."

So where do you guys think this very nice cap came from?  Who made it?  Was it salvaged from a piece of radio gear?   Does it appear in any of the old catalogs?  

Thursday, August 25, 2022

SolderSmoke Podcast #73 Jan 2, 2008 -- AA1TJ Circuits and Poetry, Mixers, CW, Straight Key Night at WA6ARA, Boatanchors in South Africa with ZS6ADY (Part 1)

This is the first in a series of four podcast that include Echolink conversations with Andy ZS6ADY about old tube radios (boatanchors) in South Africa.  Click on the YouTube link above to listen. 

January 2, 2008 SPECIAL NEW YEAR'S EDITION AA1TJ's circuitry and poetry. Homemade tubes. Book Review "Early Radio" by Peter Jensen. The Vatican's antennas. Google Earth flight simulator. Mixer madness continues (now in LTSpice). Mars-asteroid collision? Bollywood: The BITX-20 connection. BANDSWEEP: Straight Key Night at WA6ARA. ECHO-GUEST: Andy, ZS6ADY, South African Boatanchor fan. MAILBAG: Jake N4UY(NOVA QRP), Steve G0FUE (Bath Build-a-thon), Nigel M0NDE

Saturday, August 20, 2022

TRIGGER WARNING: Solid-Stating Old Tube (Thermatron) Gear (Including -- GASP -- R-390As)

Look at that.  Well, maybe some of you shouldn't. (I'm thinking of you Grayson.)  I found the Charles Smith YouTube channel while innocently looking for ideas on how to solid-state the HT-37 VFO assembly I recently bought on e-bay.  Charles Smith has some really great ideas in this area.  He solid-stated a Heath VF-1.  But he took it all to an extreme when he solid stated an R-390A.   Take a look at how he built the replacements for the thermatrons:  He used those plastic wall sockets that you screw into sheet-rock when you need to hang a picture.  This is real genius. He used the tube filament lines to carry DC to these new sockets. 



R390A Solid State Conversion Video #1:  https://www.youtube.com/watch?v=xhWzX874wYo

Charles Smith's YouTube Channel 

He has videos on the HQ-170 (DEAN:  Just say NO!) and the SP-600.  He also covers the HQ-110, which is uncomfortably close to my HQ-100.  

Who is Charles Smith?   What is his callsign?    Charles Smith is KV4JT.  Here is his QRZ page: 

He has some great humor and wisdom in his videos: Procedures that are difficult or more trouble than they are worth are called "bugger-bears."  He advises that if your IF cans are stuck, you should "find a way to unstick them!"  Indeed you should!  He builds a cool jig to hold the IF section of the R-390A while you are working on it.  He provides similar protection (with two long screws) to the VF-1.  

Even though some of you will have to go to therapy after seeing all this, I say THREE CHEERS FOR CHARLES SMITH! 

Sunday, July 24, 2022

A Surprisingly Good Movie from the Late 1960s: "The Ham's Wide World" (Video)


I found this movie to be surprisingly good.  Narrated by Arthur Godfrey, it features Barry Goldwater, and a lot of other hams.  There is a homebrewer too!  Lots of  old rigs we know and love:  a Drake 2-B, a couple of Galaxy Vs, a Benton Harbor lunchbox, Heathkit SB-series rigs, many Swans, and was that an HQ-170 that I saw in there?  There are also many cool antennas, including a 15 meter quad set up by a bunch of Southern California teenagers. 

Near the end, when they visit ARRL Headquarters, we briefly see none-other-than Doug DeMaw, W1FB!  FB!  

Please take a look at this video and post comments about the rigs, antennas, and radio amateurs that you see in the film. 

Monday, July 11, 2022

Surface-Mount Solder Smoke -- Is THIS Really Homebrew?


I was recently noting that the assembly of IC, CPU-based projects doesn't seem like real homebrew radio.  I realize that there is a danger here -- there is a tendency in ham radio to reject the new and to stick with the old.  "SPARK FOREVER" was the rallying cry when CW came along.  There are still a lot of AMers who refer to SSB as "Single Slop Bucket." So, with that in mind I point the blog to the above video.    He is using complicated ICs that probably have thousands if not millions of transistors.  But he is definitely making something new. And he releases some real solder smoke in the process.   FB.  

It is probably not for me, but others may like it. Like the old song says "Different strokes for different folks." YMMV.   

Thursday, May 19, 2022

Frank Jones's Homebrew Rig -- as described by Michael Hopkins AB5L (SK)

"Frank is all homebrew. His receiver is unshielded outside, but built around a central square of aluminum that houses a Velvet Vernier dial thru the front panel and some tubes I did not recognize jutting horizontally on both sides of the box where coils also plug in. The transmitter is a multi-stage affair on a piece of particle board. The tubes are vertical here, and the bench was littered with brown Hammarlund coils labeled 5, 10, 20, and 80."   

https://soldersmoke.blogspot.com/2021/07/summer-reading-for-homebrewers-frank.html

https://qsl.net/ve7sl/jones%20oscillator.html


Wednesday, May 18, 2022

W1VD's Boatanchor Receiver Tests


I've been trying to get more rigorous in my evaluation of receiver performance.   My HQ-100 is tuned to Radio Marti, and it sounds great.  But how great is it really?  And what about all the receivers and transceivers I have built?  How good are they?  

Our friend Dean KK4DAS is about to start the rehabilitation of his dad's old HQ-170A.   A search for that receiver led me to Jay Rusgrove's very interesting measurement and analysis of old tube type radios.  Jay's results appear in the links below.  More important is his very clear description of how the tests were done and what the results mean (link below). Also included is one link showing a discussion of Jay's work.  

Jay notes: 

The decision of which boat anchor receiver(s) to own is seldom based on performance alone. A combination of favored manufacturer, period of manufacture, features, collectability or even just 'looks' often rank higher on the priority list than receiver performance. Even if one were interested in performance specs much of the available information is subjective as few receivers manufactured prior to the mid 70s have undergone standardized testing. Hard data on minimum discernable signal (MDS), blocking and two-tone IMD dynamic range is interesting to some operators and important in an historical context as it shows the progression of receiver development.

Jay designed the very first real transmitter that I homebrewed (The VXO 6 Watter from QRP Classics). Jay has been mentioned many times in the SolderSmoke podcast and blog:    

Saturday, May 14, 2022

Mr. Carlson's Grand Receiver Restoration Project -- Your Input Sought (video)


Mr. Carlson (VE7ZWZ) is launching a series of videos on the restoration of some old boatanchor receivers.  I have been working on an old HQ-100, so this all resonates well with me. 

He asked for viewer input on which of these receivers he should work on first.  I voted for the SP-600 because I wanted to see how difficult it really is to change out the infamous Black Beauty capacitors.  My second choice was the R-390, but I warned Mr. Carlson that he might need a chassis crane for that one.  No kidding.  Really.   

I look forward to watching the series.  Thanks in advance Mr. Carlson. 

Monday, January 3, 2022

1BCG -- The 100th Anniversary of the Trans-Atlantic Test


Thanks to the Antique Wireless Association for this really wonderful video, and for their involvement in the 100th anniversary event.  Special thanks to Ed K2MP. 

On December 11, 2021, the 1BCG team in Connecticut had some technical difficulties.  As we all know, that is part of being a radio amateur. Details of the problems are presented here: 

http://1bcg.org/1BCG/the-special-event-transmitter/

Phil W1PJE managed to hear and record some of the 2021 transmission (Thanks Phil).  Listen here: 

https://drive.google.com/file/d/1uPvD9Qh-VJTnyDzOPPSrYfbksks8sQsx/view?usp=sharing

Phil also sent this spectrogram of the signal. 


Good thing Paul Godley ran into Harold Beverage on the ship going over. 

And imagine me complaining about having to step out into the carport to adjust my antenna -- Godley had to trek one mile THROUGH SEA-WEED to adjust his.  Respect.   

Thursday, December 9, 2021

Bluetooth, Winston Churchill, The Speed of Light, and a 1938 Zenith Receiver

 

Hello Bill -


It has taken me a while to put hands on keyboard to send you this message, but having seen or heard a few more of your references to Jean Shepherd, I felt I must. Being a fan of vintage radio equipment and the American scene of the late 1930s, sometime back I acquired a very nice circa 1938 Zenith 5-S-119 AM/Shortwave radio. 


Though it had been recently re-capped, it took some effort to get the thing working (needed a new power transformer), and still needs to be aligned, but it made a nice addition to my 1930s NYC Art Deco-inspired office. One reason I bought it was to add a Bluetooth receiver to it so I could listen to podcasts, etc, from my phone. I like the big electromagnetic speaker that those radios have and thought it would be cool to bring this one back to life. I picked up a small Bluetooth receiver board and a power supply for a few dollars online and got it working in the Zenith with no difficulty, except for some AC hum and oscillator noise that I will work on when I have time. So, success!

But here is the Jean Shepherd part. I recall one of his broadcasts in which he offered his theory that every radio transmission ever made is still out there, traveling further and further into intergalactic space and getting weaker and weaker, but still there. What an idea that was. I would say he is right. I have pondered the idea ever since. So being also a Winston Churchill fan, what would be the first recording I would play through the Bluetooth? What else but his 1940 blood, toil, tears, and sweat speech! So there was the scene — the Churchill speech playing the same audio waveform through a radio that might very well have played it live (or close to live) back in 1940! Almost (though not quite) like detecting the original still-traveling radio signal out there past the star Phi2 Ceti or wherever it is now!

Well that was a quick adventure this past summer that I thought you might appreciate.

Keep the Solder Smoke podcasts coming!

Tom Fuhrman, WX2J

Saturday, December 4, 2021

A Great Morning on the Old Military Radio Net: AB9MQ's Central Electronics 20A, W3EMD's Dynamotor, WU2D

Just a portion of Masa's shack

I usually try to listen in on the Old Military Radio Net on Saturday mornings (3885 kc).  Lately I listen with my Mate for the Mighty Midget receiver.  

This morning's session was especially good.  For me the highlight was when Masa AB9MQ called in from Normal, Illinois using his Central Electronics 20A (see below).   That was one of the earliest SSB rigs.  A phasing rig, it also ran AM (which was what Masa was using this morning).  He had it paired up with a Central Electronics 458 VFO.  You folks really need to check out Masa's QRZ.com page: 

https://www.qrz.com/db/AB9MQ

Buzz W3EMD called in from Rhinebeck, NY.  I could hear his dynamotor in the background.  Buzz said hello to Masa in Japanese.   FB.

Always great to hear Mike WU2D


Saturday, November 13, 2021

"First Wireless" 1922 book by Allen Chapman with Foreword by Jack Binns (free download)

 

The cover caught my eye.  Thanks to the K9YA Telegraph for posting it.  I think it captures the allure of radio that most of us felt when we were kids of this age.  

Fortunately this 1922 book is available for free download: 

It is all about radiotelephone.  They are phone guys.  Just like us.  

And they were homebrewers.  They had The Knack. From Chapter II: 

Another thing that drew the boys together was their keen interest in anything pertaining to science. Each had marked mechanical ability, and would at any time rather put a contrivance together by their own efforts than to have it bought for them ready made. It was this quality that had made them enthusiastic regarding the wonders of the wireless telephone.

And they correctly viewed wireless telephony as being similar to Aladin's lamp.   I remember writing that my homebrew DSB transceiver was like Aladin's magic carpet, carrying my voice from the Azores to friends around the world.  From Chapter III: 

They had already heard and read enough of the wireless telephone to realize that it was one of the greatest marvels of modern times. It seemed almost like something magical, something which, like the lamp of Aladdin, could summon genii who would be obedient to the call.


This is a reminder of how young the radio art is.  This book came out just three years before my father was born. Many of us have in our shacks working rigs that are half as old as radio itself. 



Sunday, October 24, 2021

WA9WFA's Mate for the Mighty Midget 1966 QST Receiver

Scott WA9WFA and I have been exchanging e-mails about his Mate for the Mighty Midget receiver project.  This morning I finally took a look at Scott's we page on this effort.  There was a lot there that resonated.  For example: 

"I remember the moment very clearly.  June 1966 I was sitting in a lawn chair reading a stack of QST's that I had brought along to the summer cabin.  The February 1966 issue the Beginner and Novice section introduced the "Mighty Midget Transmitter", a 10 watt crystal controlled transmitter.  The April 1966 issue Beginner and Novice section introduced the "Mate for the Mighty Midget" which was a three tube super-heterodyne Novice type receiver.  Over the course of that summer I read and re-read those articles a jillion times.  Being 13 years old, I didn't have the electrical or mechanical skills to pull off such a project so I could only dream about it.  In 1970 I bought a handful of the parts.  In 1976 I bought more parts.  In 2021 I decided to build it while I still had the ability to do it.  This project is only my second homebrew radio project so I am still learning things every second of the way...
 
While I am not expecting to much in performance, the 13 year old in me is ever hopeful that this 1966 Novice receiver will be the most wonderful radio ever made.   73, Scott WA9WFA"

Scott's MMM RX page: 

Scott and I are now both updating the MMM RX by substituting 455 kHz ceramic filters for Lew McCoy's FT-241 crystal filter.   I have my filter wired in now, and it is working well.  Scott plans on soldering his in today.  I will post on this mod soon. 

On his QRZ.com page, Scott notes the need to fight the temptation to further soup-up this simple receiver:  "I did have to resist the temptation to add another audio stage, a mechanical filter, AGC, 2nd IF amplifer stage, etc..."

Exactly right Scott.  Resist the temptation.   Simplicity is a virtue.  I do use an outboard, powered computer speaker, but I justify this by telling myself that I just don't want to use headphones.  But I could use headphones, so this is OK.  OK?  

Scott's QRZ.com page: 

I must add that I think the yearning of Scott's inner 13 year-old can be fulfilled by the MMM RX.  I think it is pretty wonderful.  It is -- in my view  -- not as good as a Drake 2-B, but it is FAR better than an S-38E, and it is better than a Lafayette HA-600A (wjm).  

Tuesday, August 31, 2021

Kintsugi -- A Japanese Philosophy for the Owners of Imperfect Rigs


 On Sun, Aug 29, 2021 at 4:05 PM Bob Scott wrote:

Hi Bill:

   After listening to the latest Soldersmoke I thought you might find the Japanese concept of "kintsugi" (literally "golden joinery") interesting.  
 

       As a philosophy, kintsugi is similar to the Japanese philosophy of wabi-sabi, an embracing of the flawed or imperfect.[11][12] Japanese aesthetics values marks of wear from the use of an object. This can be seen as a rationale for keeping an object around even after it has broken and as a justification of kintsugi itself, highlighting the cracks and repairs as simply an event in the life of an object rather than allowing its service to end at the time of its damage or breakage, and can be seen as a variant of the adage "Waste not, want not".[13]

  Kintsugi can relate to the Japanese philosophy of mushin (無心, "no mind"), which encompasses the concepts of non-attachment, acceptance of change, and fate as aspects of human life.[14]
 
  Not only is there no attempt to hide the damage, but the repair is literally illuminated... a kind of physical expression of the spirit of mushin....Mushin is often literally translated as "no mind," but carries connotations of fully existing within the moment, of non-attachment, of equanimity amid changing conditions. ...The vicissitudes of existence over time, to which all humans are susceptible, could not be clearer than in the breaks, the knocks, and the shattering to which ceramic ware too is subject. This poignancy or aesthetic of existence has been known in Japan as mono no aware, a compassionate sensitivity, or perhaps identification with, [things] outside oneself.

 — Christy Bartlett, Flickwerk: The Aesthetics of Mended Japanese Ceramics


73,
  Bob KD4EBM

--------------------------------------------

I shared Bob's Kintsugi message with David, WA1LBP.  David was one of the few radio amateurs in the ranks of the Foreign Service.  He was in Okinawa during the early 1990s, when I was in Santo Domingo.  For a time we both wrote columns in the "73 International" section of Wayne Green's magazine -- this made us "Hambassadors."  David is a real scholar of difficult Asian languages.  During my last years in government service I would sometimes cross paths with David at lunch time on the National Mall in Washington -- he'd be out there with a colleague, studying ancient Chinese poetry. 

Here are David's thoughts on this: 

Thanks,  Hambassador Bill.

In Buddhism, muxin (in Chinese wuxin) is about freeing oneself from troubling thoughts, distractions, and selfishness and so attaining a calmness that is very aware of all that goes on at the same time.  I suppose once free from distractions one can be more alert.  So maybe not literally no mind but no-selfish-obsessed-mind

Amazing what one can find online. A distraction too I suppose!


Chan embraced this account of nonduality and Buddha-nature, but distinctively used it to qualify the meaning of Buddhist practice and the personal ideal of the bodhisattva. In the Platform Sutra attributed to Huineng, he insists that

meditation is the embodiment (ti) of wisdom, and wisdom is the functioning (yong) of meditation.

The point of Chan is to see one’s own “original nature” (benxing, 本性) and realize “authentic heartmind” (zhenxin, 眞心), and in doing so the dualities of thought and reality, of passion and enlightenment, and of the impure and pure all dissolve. Then,

true suchness (zhenru, 真如) is the embodied structure (ti) of thinking, while thinking is the functioning (yong) of true suchness. (Platform Sutra, 13–17)

To see our own original nature is to see that true suchness and thinking are as intimately related as the bodily structure of a horse and its customary activities. Just as the bodily structure of the horse establishes the conditions of possibility for grazing and galloping, it is only the proven evolutionary advantage of grazing and galloping in horse-like ways that have made this bodily structure possible. True suchness or ultimate reality is not a preexistent something “out there” that can be grasped intellectually or accessed through some mystical vision; it can only be enacted.

Huangbo Yixun (d. 850) describes this as demonstrating no-“mind” (wuxin, 無心) or freedom from conceptual impositions that would define or limit reality. But this is not a lapse into mental blankness or indiscriminate presence. Realizing no-“mind” restores our originally whole mind (yixin, 一心) that Huangbo qualifies as the “silent bond” (moqi, 默契) of “conducting oneself as all Buddhas have” (in Taishō shinshō daizūkyu, Vol.48, 2012.380b to 383c). Significantly, the term “qi” originally referred to notches or tally marks on a strip of bamboo that record the terms of a trade agreement and the bonding that Huangbo invokes is thus one of mutually entrusted obligation and responsibility. True suchness consists in the personification of the bodhisattva ideal of realizing liberating forms of relationality. Ultimate reality consists in enacting the morally-inflected nonduality of wisdom and compassion.

David 

-----------------------------------------------------

I remember that it was George Dobbs, G3RJV who introduced us to the concept of Wabi sabi:

https://soldersmoke.blogspot.com/2010/04/homebrew-hero-george-dobbs-g3rjv.html


This philosophical embrace of imperfection and repair is very appealing to me.  I am surrounded by old radios that bear the marks of wear, tear and repair.  My homebrew radios are filled with imperfections (especially in the cabinetry).   But Kintsugi tells me this is all OK.  I accept it. 

Thanks Bob.  Thanks Hambassador David. And thanks to George Dobbs. 

Wednesday, August 25, 2021

Video: E. Howard Armstrong and Early Radio


This is a really wonderful video. It might seem slow to those accustomed to faster-paced YouTube videos, but the information content is very high -- it contains a lot of pictures I hadn't seen before and audio of Howard Armstrong.  

I never knew that the name of the radio company Zenith was derived from the early callsign "9ZN." 

As a Northern Virginian, I like the reference to NAA Arlington.  

I used to live near Yonkers, N.Y.  I remember Warburton Ave.  What a fine shack young Howard had up in that cupola attic.  

The photo of Armstrong's breadboard was very nice.  My Mythbuster is in good company.

QRPers will get a kick out of the newspaper headline "New Radio Marvel Revealed!"  (They cut the power out from 20kW to 5 watts!) 

Thanks again to Dave Bamford W2DAB for sending me the book about Armstrong, "Man of High Fidelity" by Lawrence Lessing.  

Finally, I remember talking to Bruce Kelley W2ICE at hamfests.   He was a great radio amateur: 

Be sure to check out the Antique Wireless Museum's YouTube Channel.  Lots of good stuff there: 

We have the famous photo of Major Armstrong,
 but this is the first one I've seen of a slightly younger Captain E. Howard Armstrong. 


Sunday, August 22, 2021

Joe Galeski's 1960 "IMP" 3 -Tube Filter SSB Transmitter, and the Spirit of SSB Homebrew

Here is another important bit of SSB history.  In  May 1960, Joe Galeski W4IMP published an article in QST describing his super-simple SSB transmitter.  While Tony Vitale's "Cheap and Easy" rig was a phasing design, Joe came up with a filter rig.  He built USB filter at 5775 kc.  With it, he ran a VXO at around 8525 kc. This put him on 20 meter USB. 

Here is the QST article: http://marc.retronik.fr/AmateurRadio/SSB/A_3_tubes_filter_rig_%28SSB%29_%5BQST_1960_5p%5D.pdf 

In discussing how to put this rig on other bands, Joe got the sideband inversion question exactly right: 


Thank you Joe!  

Joe even provides an comment that seems to capture an important element of the homebrew SSB ethos.  Joe homebrewed his filter, but he mentioned the possibility of using a store-bought filter: 


That's the spirit Joe!  

Along the same lines, Jim Musgrove wrote in Electric Radio: 


Having built Lew McCoy's Mate for the Mighty Midget receiver (which also used just three tubes), I can't help thinking that an IMP-ish transmitter would be an excellent complement to the Mate for the Mighty Midget.  

Jim Musgrove K5BZH knew Joe Galeski and wrote about him in the January 1992 issue of Electric Radio.  Jim wrote that Joe was an optometrist by profession. When OE1FF wanted to know the cost of building an IMP, Joe Galeski boxed up the original and sent it to him.  FB Joe. 

In December 1961 Joe Galeski published a QST article describing a transistorized version of the IMP -- this rig ran on 15 meters.  K5BZH wrote that Joe later published an article about a small, solid-state transceiver,  appropriately called "The Shrimp." 

Saturday, August 21, 2021

W2EWL's "Cheap and Easy SSB" Rig -- And The LSB/USB Convention Myth


In March 1956 Tony Vitale published in QST an article about a "Cheap and Easy" SSB transmitter that he had built around the VFO in an ARC-5 Command Set transmitter.  Vitale added a 9 MHz crystal-controlled oscillator,  and around this built a simple phasing generator that produced SSB at 9 MHz.  He then made excellent use of the ARC-5's stable 5 - 5.5 MHz VFO.  His rig covered both 75 meters and 20 meters.  Here is the article:

http://nebula.wsimg.com/2b13ac174f7f2710ca2460f8cf7d6b8b?AccessKeyId=D18ED10DA019A4588B7B&disposition=0&alloworigin=1

Because it used the 9 and 5 frequency scheme, over the years many, many hams have come to think that Vitale's rig is the source of the current "LSB below 10 MHz, USB above 10 MHz." This is  wrong.   An example of this error popped up on YouTube just this week (the video is otherwise excellent): 


First, Vitale's rig had a phasing SSB generator. All you would need to switch from USB to LSB was a simple switch.  And indeed Vitale's rig had such a switch. Pictures of other Cheap and Easy transmitters all show an SSB selection switch. So with a flip of the switch you could have been on either USB or LSB on both 75 and 20.  With this rig, you didn't even need sideband inversion to get you to 75 LSB and 20 USB. 

Second, even if hams somehow became so frugal that they wanted to save the expense of the switch, leaving the switch out (as suggested above) would NOT yield the desired "75 LSB 20 USB" that the urban legend claims that W2EWL.   As we have been pointing out, a 9 MHz SSB generator paired with a 5 MHz VFO (as in the Vitale rig) will NOT -- through sideband inversion -- yield LSB on one band but USB on the other.   

W2EWL's rig could not have been the source of the LSB/USB convention.  I still don't know where the convention came from. I am still looking for the source. 

But leaving the LSB/USB convention issue aside, Tony Vitale's rig is an excellent example of early SSB homebrewing, and of a very clever use of war surplus material.  In the January 1992 issue of Electric Radio magazine, Jim Musgrove K5BZH writes of his conversations with Vitale about the Cheap and Easy SSB.  Tony told Jim that this rig came about because the Central Electronics exciters required an external VFO -- they recommended a modified BC458.   B&W had recently come out with a phase shift network. Vitale went ahead and built the whole rig inside a BC458 box.  FB Tony! 

In the December 1991 Electric Radio, Jim K5BZH reports that Tony was recruited into the ranks of SSBers when he watched a demonstration of SSB by Bob Ehrlich W2NJR in November 1950. Tony very quickly started churning out SSB rigs.  His daughter Trish Taglairino recounted that when her father had "done something great again" there would be a parade of hams to the basement shack.  About 30 guys showed up when Tony put his first SSB rig on the air -- they sent out for beer.  

Thanks to Jim for preserving so much SSB history. 

Tuesday, August 17, 2021

Todd K7TFC on Pessimism, Optimism, and Homebrew Radio

In response to my blog post about Rob Sherwood, Todd K7TFC sent this very thoughtful comment.  It is so good that I wanted to put it up as a more visible blog post.  Thanks Todd. 

Todd wrote: 

Several of 4Z1UG's recent interviews have either hinted at or clearly expressed pessimism over the future of technically-oriented, homebrew ham radio. Of an age myself (another IGY baby) in which disgruntled cynicism is endemic, I nevertheless found their pessimism exaggerated and perhaps a little-too conventional.

Not that there's little evidence to back them up: recent retirements at QST and the magazine's thin technical coverage have not improved matters, and even QRP Quarterly recently found it necessary to spend more pages on UFOs in New Mexico than on VFOs in their readers's hamshacks. Even podcasts whose names might suggest otherwise--I'm thinking of Ham Radio Workbench--actually spend more time talking about store-bought black boxes, antennas, and cool things they've purchased (or want to purchase) than melting solder or winding coils. To be sure, HRWB, QRPQ, and even QST, make important contributions , but they do reflect the *proportional* decline of hands-on electronics.

For me, though, that the *proportion* of homebrewing, technically-oriented hams has declined is not as important as the actual numbers of hams so oriented. If their proportion is down to, say, five-percent of the total number of hams in the world, that's still *a lot* of homebrewers worldwide, and now that we interact in a truly-global theater of enthusiasts, we've never had it so good when it comes to the numbers of people who share our enthusiasms.

This question of actual numbers versus proportions can be seen in the most common modes of operation as well as on the hardware side. SSB long ago passed CW as the mode-of-choice, and now SSB is in decline *proportionally* as the weak-signal digital modes seem to be taking over. But when the bands are open, you can still tune through the lower portions of most bands and find *plenty* of CW ops at all levels of speed and clarity. CW is not dead, and in fact it's easier to learn than ever before. I expect a proportion will always see CW as essential to ham radio--enough in fact to keep them supplied with contacts to satisfy their retro-cravings and keep the tradition alive.

I may be in the last quarter (third?) of my life, but the older I get the more I come to believe in living *three-dimensionally*. The "X" is my own time and place (a west-coast Boomer), the "Y" is my own time but other places and cultures, and the "Z" is other eras, times, and places. The "other eras and times" in the ham-radio context means I don't have to abandon tank circuits and crystal filters and vacuum tubes *merely* because other and perhaps objectively-superior technology is now at my disposal. I can use the new stuff and the old stuff, too. I'd even argue that to abandon all use of older technologies means there's been no *growth*, only "progress."

We see this clearly enough in other aspects of the human endeavor. The computer may have totally replaced the typewriter, but it hasn't replaced pen, ink, and paper. The internet may be a superior repository of knowledge than printed books, but books and magazines are still widely used and are in some ways superior to online media. Microwave ovens cooking prepackaged, processed, and *manufactured* food are more efficient, but no one denies a meal made with raw whole foods and hand-prepared is better.

I expect there will always be plenty of people living three-dimensionally as hams with whom I resonate. There's already a high SWR between me and *most* people anyway. I've grown comfortable with a more-narrow bandwidth--73, Todd K7TFC
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Todd's Web Site: https://mostlydiyrf.com/

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