Monday, November 8, 2021

Save $2970! Build this $30 DIY Microphone!

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There are a number of good ideas in this video.  We've known for a long time that many expensive mics are really simple, cheap mic capsu...
4 comments:
Sunday, November 7, 2021

JPL, Mars Helicopter, Cube Sats, Ham Radio and more: N5BF talks to Eric Guth 4Z1UG

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This morning Eric Guth has a really interesting interview on his QSO Today podcast.   Courtney Duncan N5BF had a full career at JPL and is t...
Saturday, November 6, 2021

M0NTV's "Crystal Filters for the Fearful" (video)

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I really liked Nick M0NTV's approach to making a crystal filter (see video above).  He really simplifies a process that desperately need...
4 comments:
Friday, November 5, 2021

The Importance of Keeping the Noise FLAT

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  A few days ago I put up a blog post about using a noise generator (in my case my cheap FeelTech sig generator) and my TinySA spectrum anal...
9 comments:
Wednesday, November 3, 2021

Juliano

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  https://n6qw.blogspot.com/2021/11/a-scratch-built-minimalist-ssb.html
2 comments:
Tuesday, November 2, 2021

Farhan's Amazing Knack Story: From a Boyhood SW Receiver to the Design of the sBITX SDR

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The presentation starts at about the 4 minute point.  I think if I were only allowed to watch one YouTube video in the next year, I'd ma...
2 comments:
Sunday, October 31, 2021

Buy a Real Sputnik Satellite! Let's Put Sputnik Back in Orbit!

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Only 85,000 Euros (that's the opening bid).  But hey, it comes with the receiver pictured on the right.  I guess that's so you can l...
1 comment:
Saturday, October 30, 2021

Using Noise to Sweep a Filter with the TinySA

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  I've been meaning to try this for a long time.  Years ago Tony Fishpool and Graham Firth wrote about using a noise generator and a spe...
1 comment:
Wednesday, October 27, 2021

Why Does Solder Smoke Always Go Right Into Your Face? Now We Know

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Because our podcast and blog is called SolderSmoke, I felt compelled to post about this video in which a fellow does some pretty interesting...
2 comments:

How to Listen with your TinySA

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We don't get many chances to do hardware work on a piece of gear like the TinySA, but here we have one.  I mentioned this a while back: ...
1 comment:
Tuesday, October 26, 2021

SETI, Proxima Centauri, The Parkes Dish, and Intermodulation Distortion?

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  https://www.sciencealert.com/exciting-mystery-space-technosignals-were-indeed-produced-by-sentient-life-us A cosmically interesting troubl...
3 comments:
Monday, October 25, 2021

Putting a Ceramic Filter in the "Mate for the Mighty Midget" Receiver

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It is really simple.  I had one of the +/- 3kHz (6 kHz wide) 455HT filters on hand.  The spec sheets call for 2000 ohms at both ends, but lo...
3 comments: