Category Archives: Uncategorized

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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Seriously?

No really? Have I abandoned this blog for that long? I’ve been posting updates on projects and such to g+, but that’s not very discoverable, so I think I’ll come back here and post about some longer-form topics.

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Antenna modeling, part 2

Disclaimer: I’m going to start using Amazon affiliate links for books that I recommend. I’ve prepared another video about how to use xnec2c. Here’s the link to the video on blip.tv This one begins to explain the input file format … Continue reading

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