Friday, December 31, 2021

Troubleshooting Apollo: 23 MHz Crystals in a NASA Ground Receiver

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More amazing Apollo stuff from CuriousMarc.  Here we see them struggling to find the proper frequency for one of the oscillators in a dual c...
Thursday, December 30, 2021

McCoy SSB Crystal Filters (1963) -- But Apparently NOT the Real (Lew) McCoy

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  Last month we were talking about this company.  Someone thought it was run by Lew McCoy of ARRL Homebrew fame, but it now appears that ou...
Wednesday, December 29, 2021

My Kind of Chip: A Homebrew Discrete 555 Timer Built on Wooden Boards (video)

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This is really beautiful. Radraksha Vegad (Pargrahi) from India built a discrete component version of the venerable 555 timer chip.  He buil...
3 comments:
Tuesday, December 28, 2021

How to Fix the Spur Problem in my 17 Meter SSB Transmitter?

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  I built the transmitter almost 20 years ago.  It is in the larger box, which originally housed a Heathkit DX-40.  There is a lot of soul i...
6 comments:
Monday, December 27, 2021

A Christmas Story: Mike AA1TJ Builds Receiver for 486 kHz, Listens to Fessenden Commemoration (Audio)

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Mike's 486 kHz receiver As if being able to get home on Christmas Eve 2021 and then catching the Webb Telescope launch was not enough, S...
1 comment:
Saturday, December 25, 2021

A Nice Christmas Gift Out of French Guiana -- The Launch of the James Webb Space Telescope

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  A nice Christmas present from NASA and ESA on the screen early on Christmas morning.   Track Webb Telescope's progress here:  https://...

The (Real) Solar Flare of August 1972 in Cixin Liu's Science Fiction

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  A view of McMath Region 11976 from the Paris Observatory early on 4 August 1972.  I have a vivid memory of seeing -- as a kid -- Aurora fr...
2 comments:
Saturday, December 18, 2021

On 17 meter CW from Santo Domingo with a uBITX

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We are up on the 12th floor of a building in Santo Domingo. I brought my uBITX and managed to check in as baggage a 16-foot crappie fishing...
1 comment:
Thursday, December 16, 2021

Ryan's New Prototyping Board

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https://miscdotgeek.com/a-new-prototyping-pcb-for-qrp-homebrew-radio/
7 comments:
Tuesday, December 14, 2021

The Story of OSCAR 1, The First Ham Satellite

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  https://www.inverse.com/science/60-oscar-1-presaged-the-cubesat-era
Sunday, December 12, 2021

Hack-a-Day: Has DIY become Click-and-Buy?

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https://hackaday.com/2021/12/11/has-diy-become-click-and-buy/ Hack-A-Day today asks about the boundaries between DIY construction and the us...
14 comments:
Friday, December 10, 2021

The Lamakaan Annual Radio Convention Starts Today!

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  The Lamakaan Amateur Radio Club's annual convention begins today in Hyderabad, India.  This is Farhan's club so it is sure to be a...