Pinned toot

I am no longer on octodon.social and I will try my best to keep away from some of the people on that server who have taken upon themselves the mantle of upholding the principles of Free Software! I am also observing that mastodon is not so different from twitter when it comes to sane discourse. That is expected - people can't be different when they type on a different browser tab.

I will be mostly tooting my (mis)adventures with amateur radio here and not much about anything else.

Pinned toot

Thank you @M0YNG.

Hello everyone - I am Ramakrishnan. My callsign is VU3RDD and I live in Bangalore, India. I am interested in homebrew electronics and I mostly operate HF/CW at the moment. I have inverted V antenna for 40 and 20m bands.

I do computer programming for a living and work on low level software, cryptography and network protocols..

I have another account octodon.social/@vu3rdd but i thought of separating the radio/electronics toots into a separate account.

ON4UN's "Low band dxing" book is an excellent book to learn about antennas. Highly recommended.

I think as hams we should eliminate folklore and replace them with science.

2019 was a very hamfull year for me and expecting 2020 to be even more hamfull.

Did anyone save any 2019 HaskellX talk at SkillsMatter London (which has closed down since then)?

is the father of . He completely changed the computing landscape, he has a direct influence on the fixed majority of servers, websites & smartphones. Today is his 50th birthday.

*Linus Torvalds's master's thesis (1997) [pdf]
cs.helsinki.fi/u/kutvonen/inde

Built a 20W Power Amplifier for use with HPSDR. I am not very happy with the transformer wiring! It isn't hard, but I didn't research well enough before I did that. And now, I have no way to check the correctness of it as I don't have an inductance meter or an antenna analyser.

I have a few more things to do before I can test it out.

Can we have any faith in our code when it depends on tons and tons of libraries underneath? The suggested answer, "use a strongly/statically typed language" is some kind of a thought-terminating cliche. No, there are still so many moving parts in the system that one cannot fully understand.

Our washing machine has an "30 minute express wash" option. Clothes are still a little wet after this wash. One has to press another option for 17 minutes to dry clothes.

Would have been nice if there are ways to chain these options, one after the other. It would be fun to hook up an esp32 series microcontroller and talk to it wirelessly over the local network and send commands.

May be all the IoT stuff originated from these benign thoughts and then grew into the monster that is IoT today.

This page has a bunch of source for various filter design and other interesting stuff..

qsl.net/in3otd/programs.html

In short, very disappointed with Dell XPS13. The RAM is also soldered and cannot be upgraded.

I have never had a good laptop ever since I had a previous work Thinkpad laptop. I usually work from home on a Desktop computer which I really like. But I would like a good laptop for occasional travel.

If I can sell off this Dell one and an old Apple Macbook air (which works perfectly after 6 years!), I would buy a second hand x230 with more RAM and SSD.

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I have this 2015 version of Dell XPS13 (which came with Windows 10) that I use now as my radio shack computer (I had GNU/Linux on it, but now I have Windows 10 on it again).

I am very disappointed with the laptop. It has a strange hissing noise with audio (sometime, not always). It does not power on (while on hibernate/sleep) sometimes. Sometimes while powering on, it gives a long beep (not really a clean beep, it is some strange sound that my 10 year old daughter used to be scared about)..

Some more progress on building a HPSDR based station. Ordered a Hammond box for the filters. Ordered a few PCBs from JLCPCB for the receive filter. This is the first time I am ordering a PCB from them. Next up is the ordering of parts for the Rx filter. Going to be a lot of fun when everything arrives.

Correction: macos fuse stopped being free software 2 years ago. The change in the license is this:

"...redistributions bundled with commercial software are not allowed without specific prior written permission..."

(Thanks @irl for the correction)

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So fuse for macos is not free software anymore and it is going to be difficult to fork and make a free version because of Apple's kernel module certification process..

The interesting thing is that the developer used his rights under the BSD license and decided to keep the changes with himself!

A good time to remember the four freedoms that the so called "viral" copyleft gives a user: gnu.org/philosophy/free-sw.en.

Yes, copyleft licenses are good for you, the user.

I would like to initiate a fund to hire a programmer to keep an eye on Sinhala input support in GNU/Linux. This person's job will be to keep an eye on four main distributions and make sure Sinhala support is in tact when they make a new release. Please RT / share your thoughts.

"One small way to get our independence and agency back from exploitative platforms is to build personal websites to share on instead. It’s a step to taking back control, and building a web that neither relies upon, nor feeds, the harms of Big Tech."

Great post by @laura

24ways.org/2019/its-time-to-ge

Looks like everything I knew about solder flux has been wrong. Just found a bizarre problem in a board that I soldered 10 years ago and fixed it just by cleaning up the solidified solder flux on the board with alcohol.

The problem was this: The board was transmitting "dits" because there was a low resistance path from the dit line to the ground via flux.. Had a hunch that it could be a low resistance path from the line to ground via the flux which can conduct. And looks like that was true!

Got my HPSDR boards out. Setup PowerSDR (on windows, unfortunately!) and could listen in to a lot of 40m and 80m chatter. The noise reduction algorithms are so good! Next, setup a T/R switch, build a 20W amplifier and hook up the Tx. That would easily take me a few weekends. I badly need a 20m antenna now. It seem to be getting very active here! Heard russia, ukraine, poland and a few south east asian stations..

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