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Ripples in the Ether

Emanations from Amateur Radio Station NT7S

Category: Microcontrollers

Wideband Transmission #9

Arduino in the Cloud I saw a recent post on the Make blog about the new cloud ecosystem for Arduino which has been dubbed Arduino Create. Since this will most likely be the future of Arduino, it seemed wise to get an early look at the platform. It includes quite a few features, but the… Read More Wideband Transmission #9

21 June 201621 June 2016 Jason Milldrum2 Comments

200,000 Miles Per Watt

If you wouldn’t mind, I would like to draw your attention to my latest post on the Etherkit App Notes blog. In it, I detail how to create a 10 milliwatt WSPR beacon using nothing more than the Etherkit Si5351A Breakout Board, an Internet-connected PC, and a low-pass filter. A simple project, but one that… Read More 200,000 Miles Per Watt

18 April 2016 Jason Milldrum4 Comments

Wideband Transmission #6

Happy New Year 2015! 2014 was a bit of a mixed bag here. It’s been a transition year for Etherkit, as I reorganize and reorient the business for a renewed push to get the CC1 and other new products to market. I believe that good things are beginning to happen there. On a personal level,… Read More Wideband Transmission #6

1 January 20152 January 2015 Jason Milldrum12 Comments

Si5351A Breakout Board Update

I’ve had a good response to the Si5351A Breakout Board when it was posted on Hackaday last month. There have even been a few folks who went through the trouble of ordering PCBs from OSHPark so that they could build their own copies of the board for experimentation. One of them, Tom AK2B, even constructed… Read More Si5351A Breakout Board Update

15 August 201415 August 2014 Jason Milldrum14 Comments

Si5351A Breakout Board Documentation

I appreciate all of the interest in the Si5351A Breakout Board that I have available on OSHPark. I apologize for not having this available sooner, but here is a GitHub repository which hosts the KiCad design files and a PDF of the Breakout Board schematic, which lists the part numbers for the reference oscillator and… Read More Si5351A Breakout Board Documentation

7 July 2014 Jason Milldrum15 Comments

Si5351A Investigations Part 6

The theme of this blog post is not lots of tedious work, but refinement leading to good results. First off, let’s talk about the funny I2C address on the parts which I received from Mouser. Since Digi-Key has no order minimums and very inexpensive shipping available (in the form of USPS First Class mail), I… Read More Si5351A Investigations Part 6

3 June 20142 November 2014 Jason Milldrum4 Comments

Si5351A Investigations Part 5

The Si5351 library for avr-gcc that I’ve been promising for the last four posts is finally in a state where I feel comfortable releasing it, so I’ve posted it on GitHub. I think that the documentation posted on the README file and inside the code should be enough to get you going, but if you… Read More Si5351A Investigations Part 5

26 May 2014 Jason Milldrum6 Comments

Si5351A Investigations Part 3

Since the previous Si5351 Investigations post, I’ve made quite a bit of progress integrating the Si5351 into a grabber receiver. First, let’s look at the grabber receiver architecture and how the Si5351 is used in it. Above you can see the basic block diagram of the receiver. The front end has two switchable plug-in bandpass… Read More Si5351A Investigations Part 3

8 May 2014 Jason Milldrum8 Comments

Si5351A Investigations Part 2

It has been another productive weekend with the Si5351 here in the shack. Since the last report, I’ve made significant progress in confirming that the Si5351 may be a good candidate for use as a LO in a radio. After getting the most basic communications with the Si5351 going via the Bus Pirate, my next task was… Read More Si5351A Investigations Part 2

22 April 201422 April 2014 Jason Milldrum6 Comments

A Hellschreiber Clock!

I don’t know if the guy who created this is a ham (he does say he’s an engineer), but it’s a neat application of some old-school technology. He uses a PIC 12F510 to output a Hellschreiber modulated square wave right to his PC’s sound card line in port. I really get a kick out of… Read More A Hellschreiber Clock!

6 November 2008 Jason Milldrum1 Comment

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About This Blog/Bio

You've arrived at the blog of Jason Milldrum, NT7S. It's mostly related to amateur radio (especially homebrewing and QRP) but occasionally other topics will pop up when they strike me as amusing. The QTH is in Oregon wine country. Husband of Jennifer, dad of Noah and Eli. Butler to a pair of cats and a rescue Beagle.

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