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Recent Posts
- QRP Labs QRSS/WSPR Kit (Part 5 – mitigation)
- QRP Labs QRSS/WSPR Kit (Part 4 – chasing the problem)
- QRP Labs QRSS/WSPR Kit (Part 3 – Testing)
- QRP Labs QRSS/WSPR Kit (Part 2 – the User Interface)
- QRP Labs QRSS/WSPR Kit (Part 1 – the Build)
- Ubuntu File System Benchmarking
- Baofeng Packet Radio Adventures
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Author Archives: Steve
QRP Labs QRSS/WSPR Kit (Part 5 – mitigation)
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)
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)
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)
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)
Building the ARP Labs Deluxe 6-band U3S Kit. Continue reading
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Ubuntu File System Benchmarking
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 linux, planetubuntu, ubuntu, ubuntu linux, ubuntu-kernel
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Baofeng Packet Radio Adventures
Recently, I decided to set up packet radio capability for my station. This is primarily in order to be able to reach the local Winlink Radio Message Server (RMS) gateway and have email access when power and/or internet are down, … Continue reading
