🎓 Doc Freemo 🇳🇱 @freemo@qoto.org

@ab3xu Yea sadly as far as animals go the only response to stimuli an Opossum really has is to get scared, most of the time they just play dead (which is why they call it playing Opossum).

Sadly it wouldnt be easy to domesticate him enough to cuddle him, just not in their nature. But a boy can hope.

Interesting fact of the day:

Despite popular belief it is not really correct to say the speed of light is a universal speed limit in the universe. It would be more correct to say one object can never go faster, relative to another object by the speed of light.

In other words, no matter what speed I am going relative to the earth (or anything else) doesn't matter. All that matters is that nothing can go faster than the speed of light relative to me the observer.

I was cleaning out the cat boxes I keep in the yard and putting fresh straw in. Totally forgot about my nocturnal friend who was scared sensless and went hiding. I felt so bad cause he was shaking in fear. Took this quick picture then vacated the yard so he can get back to the safety if his box/home.

Poor little guy, too sweet, not mean bone in his body. I wish I could give him some cuddles ;)

Me every time I start a diet.

@M0YNG I dont recall, saved it a few days ago.

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.

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

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!

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

All the antenna on a Boing 747.

#RF #RADIO

Every day on the internet...

@bamfic @ab3xu

Oh i forgot to mention. V2 I'm working on will have 2 possible configurations. You can hook up a single Directional Coupler to it as you might a SWR meter. Or if you want you can hook up two, one before and one after your tuner. In this way the meter can track the actual antenna performance and the tuned performance at the same time. I might even add logging for analysis on a computer, or to review for checking ones on logs (since it would record the frequency time and power of any transmission, along with other info).

This post demonstrates V1 running (the directional coupler wasnt shielded as you can see).

@bamfic @ab3xu

@bamfic
Yup everything is open-source, including hardware and software. so far I am the only author. Version one worked well and was accurate, version 2 expands on it and will be more useful with a better UI. V2 will be the one someone would actually want to build which is what im developing now. V1 was a proof of concept that worked find had to be explicitly told what frequency it was on (no frequency counter).

@ab3xu

@bamfic

Screenshot in demo mode (not actual reading just showing off the UI).

@ab3xu

@bamfic Full PEP (1500W) 1MHz - 55 MHz,

@ab3xu

@ab3xu In this case it is for the sort of next level after a SWR meter. Part of a VNA Radio Meter. It doesnt just report reflected power but rather complex power, plotted to a smith chart in real time.

@ab3xu Sadly any more than that and it wont work well on the frequencies I wanted. The 126 turn one I tried out had some cool characteristics (like very low insertion loss) but self-resonated so much as to be useless.

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.

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

@Surasanji For any kind of RF really, but HAM radio too.