🎓 Doc Freemo 🇳🇱 @freemo@qoto.org

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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"You nobles, you sons of my chiefs, you superfine dandies, you have trusted to your birth and your possessions and have set at naught my orders to your own advancement; you have neglected the pursuit of learning and you have given yourselves over to luxury and sport, to idleness and profitless pastimes. By the King of Heaven, I take no account of your noble birth and your fine looks, though others may admire you for them. Know this for certain, that unless you make up for your former sloth by vigourous study, you will never get any favour from me"

-- Notker the Stammerer in De Carolo Magno

While I have no love for Trump, and will be quick to admit he is the worst president we ever had, the truth is, the electoral college is important. The main issues with it that I have personally are the changes that were made to laws around how the electorate can choose to vote. But the fundamental principle of the electoral college was a positive one in its original form.

96% of all statistics are made up on the spot.

Not even an exageration...

(taken from @Liberty4Masses )

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.

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #HamRadio

Woot! Just finished my high power directional Coupler. She works perfectly. A day well spent.

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LOL, as much as i appreciate and support the message of "we are all the same if you look past the color of our skin" I always laugh a little inside when I see that skull meme passed around. I think its just because I know enough science to recognize that there are professionals (usually archeologists or criminologists) whose entire job is to identify what someone looks like (including race) based on their skull.

One of those examples where the meme's intention is right but the execution is wrong. Either way this meme made me giggle.

I am both disturbed and amused by this at the same time.

Again, while that may be the intention of a small minority, that is not what i see from most people who use the phrase "illegal immigrants".. for the vast majority of people who use that phrase they mean, very clearly an precisely people who immigrated illegally.

In fact, youd think if you really jsut cared about accuracy of language youd be more likely to support "illegal immigrant" over "undocumented immigrant". It is possible for me to be without documents but still legal (for example someone who lost their documentation). It isnt very specific and is intended to blurr the lines between people who just dont have paperwork and people who actively committed a crime. Just as a person with forged documents wouldnt be "undocumented" but would be illegal.

Calling an illegal immigrant an "undocumented immigrant" is like calling someone who is breaking and entering into your home an "undocumented tenant".

This is coming from a person who believes illegal immigrants are not worth our time or money to prevent and, if we werent a welfare state, I'd be pushing for open borders.

Pulled out my old Directional Coupler project. It worked very well according to my spectrum analyzer. So going to build this design in to some thick well shielded project box. The old design just used solder boards I fused together. So far just got the holes drilled for the new project.

This will ultimately be the couplers I'll be using on the ROES meter to get me full PEP capable (1500 watts)

I'm amazed by just how long it takes to organize over a thousand teeny tiny surface mount electrical. components.

I love this keyboard because it completely disassembles if you need to fix it or even just want a new keyboard layout (like Dvorak). Well that and its a clicky keyboard so when I type it sounds like a million angels tap dancing :)

Upgrade? Pssh this has been my outfit since 2015!

A sneak peek at the Schematic for Version 2.0 of the ROES meter (A SWR meter with VNA capability).

#AmateurRadio #electronics #Radio #ham #Engineering #RF #HamRadio #EE #Electronics #Arduino #AVR

Person: "Would you like a cocktail?"

Me: "I didnt even know cocks could have a tail, but no, I like my cock just the way it is."

The truth hurts!