Moosetodon#engineering

If anyone is curious here are the characteristics of the Directional Coupler I just posted. The top line is the dBm on the forward port and the bottom line is the dBm on the REFL port for a 0dBm input signal. The markers for the common radio bands.

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Woot, just tested the Insertion Loss on the directional Coupler I built. It has an amazing -0.05dB IL on most frequencies except 50MHz where it is still only -0.15dB!

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I finally had the nerve to seal her up. Next I am going to clean up the outside and put a coat of laquer on her before she begins to get a patina.

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Started the final draft of the directional Coupler. Building in extra levels of shielding and a 20:1 winding ratio. I'm stoked to finally have the design locked down

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Over the past few days I built 5 different Directional couplers. Each one uses either a new design even tierly or a new winding ratio. After all the testing I've finally figured out the ideal design for the frequency range I'm targeting. Time to build the final prototype.

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It took me 3 hours but I rolled two perfect 126 turn Toroid inductors. These will be two halves of the two transformers in a Tandem Match Circuit (Directional Coupler). Should have infinitesimal insertion loss

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Reading my own code from another project to remember how to use a library because the documentation wasn't working for me.

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Decided to build another tandem match circuit based directional Coupler. This time I used a 21:1 winding ratio instead of the last one at 8:1.

It seems to have reduced unwanted coupling at lower frequencies. But more important it decreased insertion loss from about 1.15dB to only 0.03dB at 2 MHz and 0.4dB around 50MHz.

I think I prefer this particular winding ratio for my design.

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So my Directional Coupler performed fairly well. Here is the output from my spectrum analyzer. Basically one trace is for the forward port when the antenna is matched, the other is when the antenna is an open circuit. Then the other two traces are the same condition on the reflected port.

As you can see all the powers show a nice flat -20db coupling. Only exception is the one cyan trace that shows the reflected port when the antenna is matched. Since there are no reflections as expected the response is much less. It is also not linear which is to be expected.

Pretty similar results to my last attempt. Though going with fewer windings this time (8 instead of 12) seems to have results in a slight stronger coupling (-20 dBM rather than the -23 dBM I got before).

All in all I'd say its a success.

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I am now sitting next to the Celluloid Nightmare and reaching over and manually winding the take up reel every minute or so. This is how #engineering is done.

"we should be working not just to pay the bills, but to make sure we donโ€™t create software that we will one day regret", I like the term #ethicalDebt, software engineers think a lot about technical debt when building software but we should not forget the ethical debt of what we build. thenewstack.io/tech-ethics-new #software #engineering #ethics

@diegovicente Sorry, can't answer your question about data science.

For , Probability Concepts in Engineering by Ang and Tang is good.

Was running my new project in demo mode where it just continually increases the phase and magnitude of a load's complex value then plots it on a Smith chart. I was pleasantly surprised when I noticed it produced a Celtic knot pattern.

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