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Listen to Pete Juliano's Interview on "QSO Today"

October 30, 2015

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http://www.qsotoday.com/podcasts/n6qw

Juliano -- Pete

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Manhattan-style Vacuum Tubes: "An Evolution of Thermatron Homebrew Techniques" by Grayson Evans

Grayson Evans was at Dayton. Scheduling problems prevented him from being interviewed by ace correspondent Bob Crane, but Grayson was kind enough to e-mail us the essence of his presentation. And it is really wonderful. He brings the advantages of the Manhattan construction technique (fast prototyping, all components on the same side of the board, easy modification) to the world of tubes (aka valves or, as Grayson prefers, thermatrons). We also see in Grayson's work an admirable willingness to bridge the digital-analog design, to bring into his rigs the best of the old and the new. Thanks Grayson! Grayson writes: An Evolution of Thermatron Homebrew Techniques For a long time I have been trying to develop some techniques to prototype Thermatron projects as easily as the typical ?Manhattan style? solid-state construction. Thermatron projects you see now-a-days still use the traditional technique of mangling aluminum-drilling ...

Re-purposed Computer Power Supply Box Provides a Home for a BITX Transceiver

Jaydip VU3JOJ came up with a really inventive way to box up his new BITX transceiver. Nicely done. I especially like the way he put the speaker in the space intended for the fan. Very nice. This appears to be one of the new BITX 40 meter "modules" described in yesterday's blog post. FB! How fortunate the new board fits in the power supply boxes. That's very lucky. You know, I had an old computer power supply in my hand just yesterday. I almost threw it out. Obviously that would have been a mistake. Today was a BITX day. Using my BITX DIGI-TIA on 40 I had a long QSO with Rich N3TDE. Rich has a BIT20 built from a Hendricks kit acquired at Dayton. He takes it with him on the Appalachian Trail.

Why We Need To Thank Homi Bhabha for India's Role In The Discovery of Gravitational Waves

Bhabha's legacy in 21st century India is well captured in the LIGO detection paper, "Observation of Gravitational Waves from a Binary Black Hole Merger", which has over 30 Indian researchers. The LIGO scientific collaboration gratefully acknowledges the role of these Indian funding agencies, which Bhabha charted within just 25 years of his active role in India. Another critical contribution of Bhabha to modern India was the inclusion of the term "scientific temper" in our Constitution.

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Listen to Pete Juliano's Interview on "QSO Today"

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