HN user

IndrekR

1,875 karma

An electronics engineer. You can contact me via indrek@hedgehog.ee

Am open for good chat on topics that matter in life and elsewhere.

Posts106
Comments317
View on HN
www.youtube.com 4mo ago

Air defence in Kyiv visible on ISS video stream [video]

IndrekR
4pts0
war-sanctions.gur.gov.ua 7mo ago

Shahed-107 UAV Components

IndrekR
3pts0
www.signalintegrityjournal.com 11mo ago

RF Transmission over Plastic Cable Surpasses Copper and Optics at Terabit Scale

IndrekR
3pts0
econtent.hogrefe.com 1y ago

The child-like role of dogs in Western societies

IndrekR
77pts178
academic.oup.com 1y ago

Seismic evidence of liquid water at the base of Mars' upper crust

IndrekR
2pts0
www.trendforce.com 1y ago

Rapidus Reportedly to Install 10 EUV Machines, Aiming for Early Mass Production

IndrekR
2pts0
nationalpost.com 1y ago

A simple math error sparked a panic about black plastic kitchen utensils

IndrekR
141pts176
www.sciencedirect.com 1y ago

Quantum Computing and Chemistry

IndrekR
1pts0
old.reddit.com 1y ago

PSA: The Kagi search engine directly funds Yandex –- and refuses to stop

IndrekR
59pts19
www.science.org 1y ago

The dogs of Chernobyl: Populations in the nuclear exclusion zone (2023)

IndrekR
109pts25
science.nasa.gov 1y ago

Ladee Frog Photobomb

IndrekR
2pts0
www.youtube.com 1y ago

Torso by Clone – Bimanual Android with Artificial Muscles [video]

IndrekR
1pts0
jamestown.org 1y ago

PRC Adapts Meta's Llama for Military and Security AI Applications

IndrekR
3pts0
www.sciencedirect.com 1y ago

Acile E-nose based on single antenna

IndrekR
1pts0
www.axiomspace.com 1y ago

Axiom Space, Prada Unveil Spacesuit Design for Moon Return

IndrekR
1pts0
onlinelibrary.wiley.com 2y ago

A Spider Leg-Inspired mm-Scale Soft Exoskeleton Enabled by Liquid

IndrekR
1pts0
claroty.com 2y ago

Unpacking the Blackjack Group's Fuxnet Malware

IndrekR
1pts0
en.wikipedia.org 2y ago

Sputnik 99

IndrekR
3pts0
en.wikipedia.org 2y ago

Order of the Smile

IndrekR
2pts0
www.usatoday.com 2y ago

Astronauts drop tool bag into orbit that you can see with binoculars

IndrekR
114pts127
www.gc4hr.org 2y ago

Internet activist sentenced to death for tweets

IndrekR
1pts0
github.com 3y ago

Drone-ID Receiver for DJI OcuSync 2.0

IndrekR
1pts0
science.nasa.gov 3y ago

DIY Spacecraft Models

IndrekR
100pts12
royalsocietypublishing.org 3y ago

Wheel Running in the Wild

IndrekR
3pts0
www.youtube.com 3y ago

Brick Assembly [video]

IndrekR
1pts0
www.digitimes.com 4y ago

Taiwan restricts exports of modern CPUs to Russia and Belarus

IndrekR
8pts0
www.cnn.com 4y ago

Farm vehicles stolen from Ukraine by Russians have been remotely disabled

IndrekR
30pts5
en.wikipedia.org 4y ago

Dissolution of Russia

IndrekR
1pts0
ccdcoe.org 4y ago

Ukraine accepted to NATO cyber defence centre

IndrekR
125pts317
github.com 4y ago

RFC: Remove support for Russian Elbrus processor

IndrekR
7pts6

2/156 lost for Soyuz in 59 years, 2/135 for Space Shuttle in 30 years. Same rate. People often underestimate how intense STS actually was.

In QC, keeping cold is not just needed to superconduct, but to reduce thermal noise to level below the energy levels operated at.

I am using Leo Bodnar’s fast pulse generator (SMA) in my lectures to teach transmission lines. With sufficient length (I use ~1m) it works quite well to demo with a low cost scope. I originally bought it for TDR with 40GSPS/15GHz scope, which works very well with few orders of magnitude smaller lengths. Old on has upper length limit with 10MHz fixed frequency. There is a new one available with external sync and variable frequency, but I have not bought/tested it.

Except that after 11 years the equipment will have broken down or be obsolete, at which point you have to start over.

If my calculations are correct, that setup probably lasts at least 30 years. This is not a cell phone battery and panels do not degrade that fast.

A similar concept has been used for university lectures to start 15 minutes after the full hour. This was due to nobody having watches and everything being synced to the church bells ringing at the full hour. Then you had 15 minutes to get to the next lecture (in another building). Starting time was given as ct (cum tempore, with time) or st (sine tempore, without time). Usually only st was marked as everybody assumed the 15 minutes delay.

https://en.wikipedia.org/wiki/Academic_quarter_(class_timing...

Funny thing is, that news, by definition, are written about things that are newsworthy. Newsworthy things are not common, but exceptional and rare. Thus one shall not worry too much about the news as those things practically never happen in everyday life.

Used to develop readers based on similar UHF chips (868 MHz in EU). They were quite expensive compared to printed bar codes those were replacing. Also large. With (folded) antennas we are still talking about 40*10 mm minimum for the label. You can not use them on metal surfaces. Readers nearby will interfere as it works by EM wave backscattering, unlike NFC which is essentially a transformer (with electric field intentionally supressed usually). I think it still is a solution looking for problem. QR codes are cheap and NFC (14 MHz) readers are everywhere.

Have mailed live queen bees in Europe as well. Funniest was when receiving some (I think it was from Denmark to Estonia before we joined the EU) and one delivery got stuck in customs due to unpaid alcohol tax — someone had misread “Live Bees” as “Live Beer”. Fortunately this was cleared out within two days and bees were still alive (but a little short on food).