Showing posts with label radio history. Show all posts
Showing posts with label radio history. Show all posts
Tuesday, October 8, 2024

The Transistor that Changed the World -- the MOSFET

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Another great video from Asianometry.   My only quibble is that it kind of left unclear the differences between JFETs and MOSFETs.  After al...
2 comments:
Saturday, September 7, 2024

Sony and the Transistor

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  https://www.youtube.com/watch?v=7pi9k5n7Wrw I found the comment about Sony's belief that NPN transistors are superior to PNP very in...
1 comment:
Tuesday, August 20, 2024

"The Far Sound" -- Bell System Video from 1961 -- Good Radio History (video)

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This is a really OLD video, but there is a lot of great material here:  -- Tubes.  (Valves or Thermatrons) -- Coax.   -- Frequency Division ...
4 comments:
Saturday, May 11, 2024

Jens OZ1GEO's AMAZING Radio Museum

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Brace yourselves.  This is just too much, too much radio history, too much cool stuff.  We are into ham radio sensory overload territory h...
3 comments:
Thursday, March 7, 2024

The Wizard of Schenectady -- Charles Proteus Steinmetz

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Such a beautiful article.   Ramakrishnan VU2JXN sent it to me.  It reminded me of how puzzeled we were when we found "Schenectady"...
10 comments:
Wednesday, March 6, 2024

N6ASD Builds a Zinc-Oxide Negative Resistance Transmitter (and a Spark/Coherer rig)

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I saw this video and post on Hackaday this morning: https://hackaday.com/2024/03/05/making-a-crystodyne-radio-with-zinc-oxide-and-cats-whisk...
3 comments:
Monday, February 19, 2024

Jean Shepherd has Trouble with his Heising Modulator (and his date)

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This is probably Jean Shepherd's best program about homebrew ham radio.  It is about how we can become obsessed with the problems that a...
Thursday, January 18, 2024

Some Great Reading Material -- Links to Radio Publications

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  https://www.worldradiohistory.com/Home-DX.htm My fellow Hambassador Dave WA1LBP sent this to me today (from Taiwan, I think).  Lots of gre...
Sunday, January 14, 2024

QRP Trigger Warning! 500 kW from WLW (great video)

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Wow, this video will make you appreciate the simplicity of QRP!  My favorite part was when  they required the use of "dark welding gogg...
2 comments:
Friday, November 24, 2023

A FREE Book from the Early Days of Ham Projects with Transistors: The CK722 -- The Device that Got Pete Juliano Started in Homebrew

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  Pete N6QW sent this amazing book to me this morning.  Pete wrote:  "The book was the size of a Notebook and had a gray cover.  I buil...
2 comments:
Thursday, November 16, 2023

The Grid Leak Detector -- Follow-up from Yesterday's Post on the Whole Earth Catalog's "Hippy" One Tube Receiver

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Click on image for a better view When I first looked at it in the Whole Earth catalog circuit, I thought it was a regen.  But a commenter c...
1 comment:
Sunday, October 15, 2023

Spy Rigs, Para Sets, Bugs, and Enigma Machines -- Dr. Tom Perera W1TP (video)

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This is a really amazing presentation by Tom Perera W1TP to the Fairlawn (NJ) Amateur Radio Club.  There is so much great info in this prese...
Saturday, August 19, 2023

Valveman -- The Story of Gerald Wells

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Don't be deterred by the annoying test patterns at the start of this video.  Just skip past them.  The rest of the video is quite good. ...
2 comments:
Thursday, April 20, 2023

Artie Moore and the Titanic

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I had never heard of Artie Moore, but his is a very interesting story from the earliest days of radio.   https://en.wikipedia.org/wiki/Artie...
1 comment:
Thursday, February 23, 2023

Early (1912?) Ham Station

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  Perhaps a bit overdressed by today's standards, but he's got a familiar look on his face.  Confidence and pride in his rig, and a ...
2 comments:
Wednesday, February 22, 2023

The Transistor at 75, and the Raytheon CK722 (Pete's First Transistor)

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  https://www.eejournal.com/article/the-transistor-at-75-the-first-makers-part-1/ Part 4 is especially interesting to us because of the N6Q...
2 comments:

Is this the Origin of the Term "Ham" Radio?

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Click on the image for a better view The timing (1895) and the context (railroad telegraphy) seem about right.  But other etymologies are ou...
4 comments:
Monday, February 13, 2023

The Infinite Impedance Envelope Detector (done with an FET)

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Recently a fellow ham claimed that "envelope detection" doesn't really exist , and that the standard "rectification and f...
3 comments:
Thursday, January 26, 2023

"The Electrical Experimenter" -- A Treasure Trove of Inspiration

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Oh this is really phenomenal.  Nick "the Vic"  M0NTV is on the mend from some routine surgery.  While mending he found this 1915 i...
3 comments:
Monday, December 26, 2022

A Blast from the Past: TR on Homebrewing (sort of)

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  "It is not the critic who counts; not the ham who points out how the homebrewer stumbles, or where the builder of rigs could have bui...
2 comments: