Lmst

Санкт-Петербург | St. Petersburg, 2008.

(c) Artem Lezhepekov

#closeuprussia #artemlezhepekov #rf #photography #photo

Here's the voltage controlled phase shifter's voltage to phase relationship at 140MHz. I had to make the graph on my Ryzen PC because the Pentium III was having nothing to do with matplotlib (actually ran out of disk space trying to install all the deps!). #electronics #rf

A graph produced using matplotlib, it shows phase on the x axis and voltage on the y axis. The curve rises from -50 degrees to 70 degrees, with a concave shape, it's not quite exponential or a square law curve.

A while ago at Nighthack we built an RF directional coupler. Why? We’re working on a power amplifier and need to feed a spectrum analyzer while dealing with signals above 1 kW. High-power attenuators are painful, so the coupler “steals” a small, safe fraction of the signal for measurement. Target was –30 dB; we’re flat to ~30 MHz and reach ~–33 dB above that. Not bad at all.

#rf #hamradio

A detailed close-up of the internal wiring of the RF coupler. The camera focuses on the soldered connection between the center pin of a large coaxial connector and a short length of coaxial cable used as the through-line. The dielectric and braid termination are clearly visible. The aluminum enclosure walls surround the assembly, with threaded mounting holes in the corners. On the right side, a smaller SMA connector is mounted through the wall, with its center pin extending inward but not connected in this view. The image highlights precise mechanical layout and RF-aware construction techniques.

A close-up photograph of RF components on a light-colored workbench. In the foreground there is a small toroidal ferrite core tightly wound with multiple turns of enamelled copper wire, forming a transformer or current-sensing coil. Two copper leads extend from the winding to the left. Behind it sits a small rectangular aluminum enclosure with an open top. The enclosure has RF connectors mounted on its sides: a gold-plated SMA connector on one wall and a larger silver UHF or N-type connector on another. The metal surfaces are clean and machined, suggesting a custom-built RF measurement device.

A photograph of a spectrum analyzer screen displaying multiple RF traces over frequency. The horizontal axis spans from approximately 1 MHz to 150 MHz, and the vertical axis shows signal level in decibels. Several colored traces (cyan, yellow, and magenta) represent different measurements or configurations of the RF coupler. A deep notch is visible around the mid-frequency range, followed by a pronounced peak near approximately 55 MHz. On-screen markers highlight specific frequencies and amplitudes, including a readout near 55.16 MHz at about –31 dB. The image documents frequency response and coupling characteristics of the device under test.

Спасский, Челябинская область | Spassky, Chelyabinsk region, 2018.
(c) Sergey Trapezin

#closeuprussia #sergeitrapezin #rf #photography #photo

@rf

Российские регистраторы начали разделигировать домены по требованию ркн
https://habr.com/ru/news/977860/

#rf #1984 @rf@mastodon.ml

Vestrahorn, Where the Ocean Dreams by Vagelis Pikoulas

https://tmblr.co/Z7VXvxibSF7KCy00

#vestrahorn #stokksnes #iceland #icelandic #mountains #mountain #black #sand #beach #canon #r6 #r62 #r6ii #1435 #rf #panorama #panoramic #pano #vertical #august #summer #2025 #travel #europe #landscape #scenery #scenic #nature #view #sky

Random FediRequest - does anyone know of a good verilog discussion of "large" cross bar switches? I'm wondering if I can build a 16 x 16 cross bar in the Zynq fabric. I've seen a bunch of "small" cross bars (2 x 2 up to 5 x 5) with basically a bunch of case statements. But was wondering if there was some scheme that helped with larger ones. #rf #verilog #fpga

Published: Python → generates 3D Fresnel zone volume + LOS between two points and exports KML/KMZ for Google Earth. Great for quickly seeing whether “it should work” and why it doesn’t.
https://github.com/jlpoolen/3D_fresnal_line_of_sight

#RF #Fresnel #LineOfSight #Wireless #GoogleEarth

A night alone with the Universe by Vagelis Pikoulas

https://tmblr.co/Z7VXvxiaE-F-Ka00

#stars #star #milky #milkyway #way #universe #galaxy #sky #skyscape #night #nightscape #long #exposure #silhuette #canon #r6 #r62 #r6ii #1435 #1435mm #rf #september #autumn #2025 #view #flickr #thingsdavidlikes

Саратов, Саратовская область | Saratov, Saratov region, 2014.
(c) Alexander Aksakov

#closeuprussia #alexanderaksakov
#rf #photography #photo

@rf

Принят законопроект о запрете передачи персональных данных в небезопасные страны, который значительно ужесточает правила и накладывает ограничение на трансграничную передачу данных граждан рф.

государство будет определять, какие страны и компании обеспечивают достаточный уровень защиты персональных данных граждан и если они не будут соответствовать новым требованиям, они могут быть заблокированы на территории рф.

https://sozd.duma.gov.ru/bill/951518-8#bh_histras

#rf #1984 @rf@mastodon.ml

Complete Smith chart GTK4 widget ... (for the few who write microwave /RF applications for Linux)
https://github.com/VK2BEA/GTK4-Smith-Chart/tree/main

#rf #microwave #gtk4 #smithchart

Пользователи приложения госуслуги на Android сообщили в отзывах, что после установки обновления не могут зайти в приложение без подтверждения через получение кода из мессенджера max.

Ранее, минцифры рф сообщало , что приняло решение отказаться от подтверждения входа на портал госуслуги через смс:
https://digital.gov.ru/official-position/vhod-v-prilozhenie-gosuslugi-mozhno-podtverdit-raznymi-sposobami

Но еще осталась возможность использования totp, в настройках госуслуг можно сменить двухфакторное подтверждение по смс на вход по одноразовому коду.

#rf #1984 @rf@mastodon.ml

From ⁨⁨⁨⁨⁨#AnnafromUkraine⁩⁩⁩⁩⁩ @AnnafromUkraine@youtube.com

#PUTIN’S THREATS TO EUROPE EXPOSED: COLLAPSE IN #RUSSIA Vlog 1246: War in #Ukraine

Ukrainian #drones destroyed two very important military sites in #Chechnya, #RussianFederation, – an #FSB base and #Kadyrov`s #Akhmat regiment base, demonstrating how far inside the #RF frontlines extend.

#russoUkrainianWar

https://youtu.be/UvKNS5J1Gak

You can always buy me a coffee for more video projects to come:
☕️ https://www.buymeacoffee.com/AnnafromUkraine

"Rzecznik Finansowy przygotował ogólne Oświadczenie w sprawie sankcji kredytu darmowego"

[PDF] https://rf.gov.pl/wp-content/uploads/2025/12/SKD_ogolne_oswiadczenie_RF-1.pdf

https://rf.gov.pl/rzecznik-finansowy-przygotowal-ogolne-oswiadczenie-w-sprawie-sankcji-kredytu-darmowego/
#rf #kredyt #bank #finanse #money

Сясьстрой, Ленинградская область | Syasstroy, Leningrad region, 2014.
(c) Artem Lezhepekov

#closeuprussia #artemlezhepekov #rf #photography #photo

@rf

Kirkjufell, West Iceland by Vagelis Pikoulas

https://tmblr.co/Z7VXvxiWLEDniu00

#kirkjufell #mountains #mountain #iceland #icelandic #view #west #canon #r6 #r62 #r6ii #24105mm #24105 #rf #mount #sea #seascape #landscape #scenery #scenic #scene #travel #europe #2025 #summer #august #flickr #thingsdavidlikes

Сатка, Челябинская область | Satka, Chelyabinsk region, 2017.
(c) Sergey Trapezin

#closeuprussia #sergeitrapezin #rf #photography #photo

@rf

1月28日(水)に、CQ出版社がセミナ『実習・ギガビット高速信号伝送技術の基礎と適用技術および評価 ―― 高速信号伝送の基礎、そしてシミュレーションから計測技術まで』を開催。東京都文京区・CQ出版社にて。詳細は https://seminar.cqpub.co.jp/ccm/ES25-0120 に。
#Seminar #RF #Gigabit #SignalTransmission

OKIサーキットテクノロジーは「高周波ビア高精度シミュレーション技術」を開発した。1.6Tbpsクラス高速伝送・多層プリント板のビア特性を制御する。詳細は #OKI の11月17日付プレスリリース https://www.oki.com/jp/press/2025/11/z25052.html を参照。カンファレンス SWTest Asia 2025 (11月20日-22日、福岡)に出展する。
#PCB #Vias #RF #Simulation

#RF

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