Author Archives: Steve

About Steve

I'm Steve Conklin, AI4QR I'm employed by Salesforce, on the SRE team for Heroku. Interests include Linux, open source software and hardware, electronics and music, and amateur radio.

QRP Labs QRSS/WSPR Kit (Part 5 – mitigation)

Posted on June 20, 2017 by Steve

Continued from Part 4 I looked at the design of the transmitter again, thinking about where all the VHF energy could be coming from. The transmit signal is generated by the Si5351A synthesizer module, and then goes directly to the FET … Continue reading →

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QRP Labs QRSS/WSPR Kit (Part 4 – chasing the problem)

Posted on June 19, 2017 by Steve

Continued from Part 3 I replaced the 25mm standoffs between the main and filter boards with aluminum ones, and retested. Things got better . . . and worse. It was now passing on half the bands but still failing on … Continue reading →

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QRP Labs QRSS/WSPR Kit (Part 3 – Testing)

Posted on June 18, 2017 by Steve

Continued from Part Two. When I put the kit on the test bench, I found that it didn’t meet FCC Part 97 requirements on any of the six bands: 10, 15, 20, 30, 40, or 80 meters. Part 97.307 requires … Continue reading →

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QRP Labs QRSS/WSPR Kit (Part 2 – the User Interface)

Posted on June 17, 2017 by Steve

Continued from Part 1 The user interface for the unit is a two-line LCD display, and two pushbuttons. The LCD is a good looking White on Blue backlit display. There are construction options to set autodimming of the backlight, and … Continue reading →

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QRP Labs QRSS/WSPR Kit (Part 1 – the Build)

Posted on June 16, 2017 by Steve

Building the ARP Labs Deluxe 6-band U3S Kit. Continue reading →

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Ubuntu File System Benchmarking

Posted on January 17, 2014 by Steve

UPDATE: The URLs below are dead. I no longer work at Canonical, and don’t know if file system benchmarking is still part of their kernel testing process.   I’ve been working to implement file system benchmarking as part of the … Continue reading →

Posted in Open Source, Ubuntu | Tagged , , , , | 5 Comments