Show more

Cat Update:

My cat is still fantastic and I love her more everyday.

This has been your cat update.

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

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.

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

So i stuck a piece of hot pepper cheese in the dehydrator for shits and giggles... this is actually working. It is drying out, solid (was liquidy for a quick minute), and the little sample i took it tasted good. This might actually work...

Just a reminder, even if big game hunters are assholes for their desires, the truth is it is the #1 most effective way to fund conservation in many third world countries.

It has done more to save species than much of anything else we tries.

So next time you want to ban trophy hunting just remember like most things all that does is drive it to the black market and denies an effective revenue source used almost exclusively for conservation.

I finally got to watching "Adam Ruins Everything". I'm on the eigth episode and really digging this.

I'm usually pretty critical of mainstream "fact" shows because even when they are sorta close to accurate, they frame it in a way that is often misleading or with an agenda.

This show however is spot on. No left or right lean, controversial facts are delivered really accurate. this is completely on spot. Really digging it.

Hell even i am learning shit. They are talking about the hymen and definitely threw me some new info.

While I luckily don't suffer from any of these diseases myself I have spent a lot of time trying to help those that do. This meme is spot on, peoples judgments are always more a mix of ignorance and hate rather than any sense of real understanding.

The plot of spiderman really kinda had to work out the way it did. The alternative would be kinda boring.

After seeing over a dozen doctors and being dismissed by all of them I finally found one who took my situation seriously. I got a steroid injection today and in 2 - 3 days if all goes well i should feel some relief.

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.

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.

"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.

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.

Show more

πŸŽ“ Dr. Freemo :jpf: πŸ‡³πŸ‡±'s choices:

QOTO Mastodon

Welcome to the QOTO instance

QOTO: Question Others, Teach Others

A Mastodon instance for scholars in Science, Technology, Engineering, and Mathematics (STEM) and all yearning to learn.

A free speech space. No censorship here.
We do not silence or block any instances.

Unique Features
  • Inline math Latex support - Use \ ( and \ ) for inline LaTeX, and \ [ and \ ] for display mode.
  • 65,535 character limit for toots (usually 500)
  • 65,535 character limit for profile bio (usually 160)
  • Full text searches - usually you can only search hashtags and usernames
  • Halcyon / Twitter clone front-end - Want the interface to look exactly like the Twitter interface? After you signed up just go here to login:
  • PeerTube - We host our own PeerTube server with open registration for up to 100MB, but all of our active users get unlimited quotas. Sign up here:
  • Professionally hosted with nightly backups
  • light modern theme with full width columns (not fixed)
  • Several extra themes - including mastodon default and mastodon default with full width columns (not fixed)

Message to New Members

Welcome to the Qoto Mastodon instance, its like twitter but better!

Please don't hesitate to Direct Message me or tag me in Toots (what we call tweets here) if you have any questions or even if you just want to chat.

If you are new to Mastodon you may want to check out this official getting started guide:

We are a free speech, no censorship zone. Feel free to talk about whatever you want, say whatever you want, as long as it is legal you wont ever get banned from the server. With that said we do have a few rules: No spam, and no using multiple accounts to circumvent personal bans.

This server isnt a typical mastodon server either. I have personally modified the code on this server to give it several unique features you wont find on other servers.

If you are new to Mastodon here is some useful info.

First off, if your coming from Twitter and you'd prefer an interface that looks exactly like twitter, then just go here and login with your Qoto credential: No need to create an account there, your account on this server will work just fine. Just enter your username in the following format @[username] so for me it would be @freemo But personally I think our default skin here is way better.

Basically Mastodon is a decentralized twitter. That means anyone can run a server (like Qoto) that people can sign up to and use just like twitter. The unique part is how the servers talk to each other.

If you want to tag someone on the same server as you then you can just do @user however if you want to specify someone on a different server you can do @user@server. If someone follows you or mentions you on any server on the internet you'll get notified right here. So my full tag is

So now a bit about the timelines, there are three (unlike twitter there is just one): Home, Local, Federated.

The Home timeline is just like what you'd expect on twitter, that is, everyone you are following.

The local timeline is any post made by anyone on your local server.

The federated timeline is what is cool. It combines the timeline of everyone on the server into one. This way you can see the posts of everyone that is followed by anyone on the server (assuming the post is public). So this timeline is a close representation of everyone on the internet who has Mastadon (though not really). Moreover we have a bot here that goes around and federates with everyone it can find, so our Federated Feed is rather robust covering thousands of instances.

Only other thing that is unique is listed vs unlisted posts. You have normal privacy settings like on twitter but you also can set a post to be listed or unlisted. If it is listed it acts just as i described. If it is unlisted then it acts just as a normal tweet would but it doesnt show up on local or federated timelines anywhere.

Also this goes without saying, but don't be racist, sexist, hateful, and don't harass people. Its a pretty shitty thing to do, don't be shitty!

The following is the list of QOTO administrators/moderators.
Note: The account listed as the administrator is NOT an actively monitored account. It was selected so as not to show favoritism among our moderator group, we are a democracy and even our administrators and moderators are held to the same high standards of decency as the rest of the community.

***We will never advertise on QOTO or sell your information to third-parties***