Matt W1CDNNew reading material!
Oliver KI3P
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Primarily interested in home brewing. Contributor to the open source T41 software defined transceiver and primarily software developer for the new software baseline
@W6KME The Great Scott YouTube channel compared Wago connectors to wire nuts regarding pull strength, resistance, flammability, etc: https://youtu.be/zgjo36-jaFY
What Wire Connector is the Best? Settling a Debate! Wire Nut VS Wago
@BrucePerens_K6BP The 3 axis antenna will solve the issues: you don't have to be concerned about orienting a 2-axis system orthogonal to the incident wave since you're sensing 3 axes
@BrucePerens_K6BP If your antennas are horizontal, they will only be orthogonal to a wave that comes from directly overhead. Any actual HF signal will arrive from close to the horizon, which will affect the accuracy of this measurement in some fundamental way I'm sure
@BrucePerens_K6BP Yes, if I understand your question. If the two horizontal antennas are orthogonal to each other and to the incident wave and you sample them in a phase-coherent manner, then you have all the information you need to fully describe the polarization state of the incident wave.
A useful way of describing that polarization state is with a Stokes vector:
https://en.m.wikipedia.org/wiki/Stokes_parameters
In the setup you describe, you have measured Ex and Ey from which you can calculate I, Q, U, and V.
@g7kse my guess is that it's supposed to be #8-32 which is a standard size:
https://www.machiningdoctor.com/threadinfo/?tid=15
https://www.machiningdoctor.com/threadinfo/?tid=15
@hb9hox The bones of such a project exists in the homebrew community in the T41 software designed transceiver -- a fully open source hardware and software radio. The current version is V12. The software part is currently implemented in C code in the Arduino framework, executed on a Teensy 4.1 microcontroller. But since the radio is open source and modular you can replace the Teensy with, for instance, a Pi 4 running gnuradio instead.
@g7vkq @g0fcu I tried both hot plate and hot air. Both worked ok, though I prefer hot plate if I'm assembling a large board in one go. The biggest effect was due to how I put down the solder paste. I tried squirting it from the end of a syringe which was messy and led to doing a lot of cleanup. The best method for me was to use a toothpick to dab blobs of solder paste on the pads and lines of paste across the pads of the QFN parts
@g0fcu hmm, I don't know the answer to that. The V12 boards have significant changes in layout, particularly for the QSE/QSD sections, but might share many of the same components. I only got involved in the project with V12 so lack first-hand knowledge. The BOMs for the V12 boards are all on GitHub:
https://github.com/DRWJSCHMIDT/T41/tree/main/T41_V012_Files_01-15-24/T41_V012_BOMs
https://github.com/DRWJSCHMIDT/T41/tree/main/T41_V012_Files_01-15-24/T41_V012_BOMs
