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#imd — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #imd, aggregated by home.social.

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  1. Kerala has been placed under a yellow alert as heavy rain intensifies across all 14 districts. Schools and colleges are closed in several districts, while the IMD has warned of strong winds and lightning. english.mathrubhumi.com/news/k #KeralaRains #KeralaWeather #YellowAlert #IMD #HeavyRain

  2. Kerala remains on high alert as the IMD issues a red alert for six districts after Ayyankunnu in Kannur recorded 320 mm of rainfall. Heavy rain, strong winds and flood risks are expected to continue. english.mathrubhumi.com/news/k #Kerala #KeralaRain #KeralaFloods #KSDMA #IMD

  3. Heavy rain continued to lash Mumbai as the IMD issued an orange alert for Mumbai, Thane and Raigad. Assam floods have affected 3.63 lakh people, while the rain-related death toll in Jammu and Kashmir has risen to 23. english.mathrubhumi.com/news/i #MumbaiRains #MumbaiWeather #OrangeAlert #IMD #WeatherUpdate

  4. Nice summary of what the Index of Multiple Deprivation (#IMD) entails and what some of its strengths and limits are, from @opendatamcr :

    opendatamanchester.org.uk/digg

    #opendata #deprivation

  5. Good morning early birds, today is International museum day!

    Art things, technical things, funny things, historical things, interesting things, all there, including small and local museums, and mostly with free/reduced admission.

    - open lokjo.com
    - navigate/gps to your area
    - search 'museums' ..

    ..and there you go!

    #InternationalMuseumDay #IMD #europa #interesting #art #funny #technical

  6. Spectral Filth: Clean Up Your Signal or Shut it Down

    1,563 words, 8 minutes read time.

    The spectrum is a finite piece of territory, and right now, you’re squatting on it like a man who doesn’t know how to clean his own house. Amateur radio used to be the domain of builders—men who understood that every watt of power was a responsibility. Now, the bands are crawling with appliance operators who treat their rigs like smartphones. They buy a cheap, unbranded box from overseas, hook it up to a sub-par antenna, and start spraying RF across the band like a broken sewer pipe. This isn’t just a technical oversight; it’s a failure of discipline. If your transmitter is throwing spurious emissions, you aren’t a radio operator. You’re a source of pollution. You are the high-frequency equivalent of a neighbor who lets his trash blow into everyone else’s yard. It’s time to stop making excuses, stop blaming the ionosphere for your lack of reach, and start looking at the cold, hard physics of what is actually coming out of your feedline.

    THE GUTLESS REALITY OF NON-LINEAR TRASH

    When you push a signal through an amplifier, you’re engaging in a fight with physics. If that amplifier isn’t biased correctly—if you’re driving it into saturation because you’re obsessed with the “100W” glowing on your meter—you are creating harmonics. These are the bastard children of your fundamental frequency. You think you’re sitting pretty on 7.150 MHz, but because your hardware is junk or your settings are sloppy, you’re also screaming on 14.300 MHz and 21.450 MHz. This is non-linear distortion, and it is the mark of a man who hasn’t mastered his tools. A real operator knows that the “final” in his radio is a delicate balance of current and voltage. When you push it too hard, the peaks flatten out, the sine wave turns into a jagged mess, and the resulting spectral splatter is an embarrassment. You aren’t just taking up more space than you’re entitled to; you’re stepping on the weak-signal guys three states over who are actually trying to do something meaningful with their license. If you can’t run a clean signal at full power, back the gain off. Mastery isn’t about being the loudest voice in the room; it’s about being the most precise.

    SHIELDING, STRAY INDUCTANCE, AND THE COST OF LAZINESS

    RF is a restless beast. It doesn’t want to stay on the copper traces of your PCB. It wants to radiate from every unshielded wire, every loose screw, and every poorly grounded chassis. If your hardware looks like a bird’s nest inside, you have already lost the war. Spurious emissions aren’t always harmonics; sometimes they’re parasitic oscillations—high-frequency ghosts born from the stray inductance of long lead wires and the lack of proper bypassing. When you skimp on the build quality, or when you use a switching power supply that hasn’t been filtered for common-mode noise, you are inviting filth into your signal. You wouldn’t drive a car with a leaking fuel line, so why are you operating a radio that leaks RF from its own casing? Every milliwatt that doesn’t go out the antenna port as a clean fundamental frequency is a milliwatt that is working against you. It creates RFI in your own shack, it trips your GFCI breakers, and it makes you a nuisance to your neighbors. You need to understand the mechanics of shielding. A chassis isn’t just a box to hold the components; it’s a Faraday cage. If you’ve compromised that cage because you were too lazy to tighten the bolts or use proper EMI gaskets, you are the problem.

    THE GATEKEEPERS: BUYING VS. BUILDING YOUR DEFENSES

    If you’re running a high-power station—pushing a kilowatt or more—you don’t play games with homebrew experiments unless you have the lab equipment to back it up. At those levels, the heat and reactive power in a filter are enough to turn cheap components into shrapnel. You buy a commercial Low-Pass Filter (LPF) from the outfits that build them like tanks—Bencher, Barker & Williamson, or DX Engineering. You’re looking for a heavy-duty, shielded enclosure that guarantees at least 50dB to 60dB of attenuation at the second harmonic. This is your “Master Gatekeeper.” It’s the insurance policy that keeps your high-power harmonics from bleeding into every television and radio in a three-block radius. Buying a filter isn’t an admission of defeat; it’s a strategic decision to use a tested, calibrated tool to protect the integrity of the bands. However, if you want to call yourself a master of this craft, you eventually have to build. For low-power rigs or specialized band-pass needs, building your own filter is where the theory becomes reality. You don’t use junk-box parts. You use precision-wound toroids—T50-2 or T60-6 powdered iron—and high-voltage Silver Mica or NP0 capacitors. If you use cheap ceramic discs, your filter’s cutoff frequency will drift as soon as the components get warm, and you’ll watch your SWR climb while your signal turns back into trash. Building a Chebyshev or Elliptic filter forces you to understand the relationship between inductance and capacitance. It’s a rite of passage. But remember: you never put a homebrew filter on the air without verification. You use a Vector Network Analyzer (VNA) to sweep that circuit and prove it’s doing its job. You verify the insertion loss and you confirm the stopband. If you can’t prove it’s clean on the bench, it doesn’t touch the antenna.

    Whether you buy it or build it, the responsibility for what leaves your shack stops with you. You wouldn’t drive a truck with no mufflers through a quiet neighborhood at 3 AM, so don’t be the operator who thinks it’s okay to spray wide-band noise across the spectrum because you were too lazy to install a filter. A clean signal is the signature of a disciplined man. It shows you respect the physics of the medium and the rights of every other operator on the air. If you’re too cheap to buy a filter and too lazy to build one, do the world a favor and stay off the mic. The airwaves are a shared resource, not your personal dumping ground. Every time you key up, your reputation is on the line. Are you a technical asset, or are you just more noise? Real operators don’t guess; they measure. They don’t hope; they verify. Master your hardware, tighten your shielding, and for the sake of the hobby, clean up your signal. If you can’t operate with technical integrity, you shouldn’t be operating at all. Solder the solution or shut it down.

    SECURE THE SPECTRUM: LOCK DOWN YOUR SIGNAL INTEGRITY NOW

    Stop being a spectator in your own shack. If you’ve spent more time looking at the price tag of your rig than the spectral purity of its output, you’re part of the problem. Your license isn’t a trophy; it’s a mandate to maintain technical excellence. If you aren’t checking your footprint, you’re just another lid adding to the noise floor.

    Here is your mission:

    • Audit your signal: Stop trusting the factory sticker. Put your rig on a dummy load, grab a VNA or a spectrum analyzer, and prove to yourself that your second and third harmonics aren’t bleeding into territory where they don’t belong.
    • Kill the noise: If you find filth, fix it. Solder a low-pass filter, choke your lines with real ferrites, and tighten every screw on your chassis until that Faraday cage is airtight.
    • Educate the soft: When you hear an operator splashing across the band with a dirty signal, don’t just complain about it on a forum. Direct him to the physics. Demand better from your local club.

    The grid is fragile and the noise floor is rising. We need operators who are assets, not liabilities. Clean up your signal today, or pull the plug. The airwaves don’t owe you a thing—you owe them your discipline. Own your frequency or get off it.

    SUPPORTSUBSCRIBECONTACT ME

    D. Bryan King

    Sources

    Disclaimer:

    The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.

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    #AmateurRadio #AmateurRadioTechnical #AmplifierBiasing #BandPassFilter #ChebyshevFilter #CommonModeCurrent #electromagneticInterference #EllipticFilter #Elmering #EMI #FaradayCage #FCCRegulations #FerriteChokes #hamRadio #HarmonicDistortion #HighPowerRF #IMD #IntermodulationDistortion #LinearElectronics #LowPassFilter #LPF #NonLinearAmplification #ParasiticOscillation #Part97Compliance #QRP #RadioHardware #radioSpectrumManagement #RadioStationAudit #RadioTransmitterMaintenance #RFEngineering #RFFeedback #RFFilterDesign #RFGrounding #RFPowerAmplifier #RFShielding #RFI #signalIntegrity #SignalPurity #SilverMicaCapacitors #SpectralFootprint #SpectralSplatter #SpectrumAnalysis #SpuriousEmissions #TechnicalDiscipline #TinySA #ToroidWinding #VectorNetworkAnalyzer #VNATesting
  7. Government Downplays Heatwave Fears Amid Regional Alerts

    India's government reassures citizens about heatwave conditions on May 2, 2026. Find out which regions are affected and what steps are being taken.

    #IndiaHeatwave, #ClimateAction, #PublicHealth, #IMD, #HeatActionPlan

    newsletter.tf/india-heatwave-g

  8. Some parts of India may face hotter and more humid weather, but the government states most areas will have normal or cooler temperatures. Early warnings are in place for affected regions.

    #IndiaHeatwave, #ClimateAction, #PublicHealth, #IMD, #HeatActionPlan
    newsletter.tf/india-heatwave-g

  9. TIL that International Non-Binary People’s Day is on the 14th July, and this date was chosen because it’s midway between International Women’s Day (8th March) and International Men’s Day (19th November).

    en.wikipedia.org/wiki/Internat

    #IWD #INBPD #IMD

  10. Unofficial IMD Weather API: forecasts, past observations, weather & station codes. Reverse engineered from official sites, built with FastAPI + OpenAPI docs. No IP registration needed.

    weather-in-production.up.railw

    #WeatherAPI #IMD #FastAPI #Python #OpenSource #IndiaWeather

  11. Die Aktion ist Teil des Abschlusses eines Konzepts des Integrated Pest Managements (IPM) im #KunstdepotDarmstadt. Zusammen mit dem Institut #Mathildenhöhe, dem #JazzinstitutDarmstadt und dem Internationalen Musikinstitut Darmstadt #IMD werden darin präventive Vorgaben festgelegt, aber auch Maßnahmen für den Ernst(be)fall geplant.

  12. RE: 433.world/@Yuvalne/10998733887

    this week is #InternationalMensDay! this pattern still holds strong in 2025.

    trends.google.com/trends/explo

    the thing is, International Men's Day is a really great cause. but many people don't care about men, they just care about hating on women.

    #IMD #November19th

  13. @ChrisMayLA6 @TimWardCam
    Even averaging LSOAs (lower super output area) over districts can hide local variation.

    (LSOAs represent about the same number of people but low-density LSOAs can appear larger than high-density LSOAs.)

    Source maps: deprivation.communities.gov.uk

    #imd #imd2025 #deprivation #map #gis

  14. ‘Collective intelligence vs. artificial intelligence’.

    This closed expert roundtable hosted by the Wikimedia CH Innovation Programme, will bring together researchers, AI specialists, and Wikimedia leaders.

    The event held at IMD in Lausanne is curated by Alek Tarkowski (@openfuture). The conversation will contribute to a white paper on AI and collective intelligence to be published in 2026.

    #WikimediaCH #AIroundtable #InnovationProgramme #IMD

  15. On 18 May, the International Council of Museums will celebrate International Museum Day under the theme "The Future of Museums in Rapidly Changing Communities." At the invitation of ICOM, Wikimedia CH's GLAM team will be providing communications support for this year's campaign. We are organising an online event that focuses on the role of museums not only as guardians of the past, but also as architects of the future.
    IMD 2025-Poster by ICOM, CC BY-SA 4.0
    #ICOM #IMD #IMD2025 #wmch

  16. International Men’s Day 2024: On behalf of everyone at MBC (we run the UK International Men’s Day platform) we would like to offer our wholehearted thanks to everyone who took part in #InternationalMensDay / International Men’s Day yesterday. It was the best ever!. It is also not ‘over’ as there …

    Read more menandboyscoalition.org.uk/new #NewsEvents #IMD #InternationalMensDay

  17. Spending the day on posts about International Men's Day, derailing the whole post by asking when international women's day is, "what about women"-ing, and "not all women!"-ing everything..

    #IMD #InternationalMensDay #Sexism

  18. Zum nächstmöglichen Zeitpunkt ist im Internationalen Musikinstitut #Darmstadt #IMD eine #Fami-Teilzeitstelle im Bereich Bibliothek und Archiv zu besetzen. Bewerben kann man sich bis zum 16. August 2024 über das Online-Jobportal der Wissenschaftsstadt Darmstadt: dablog.hypotheses.org/16517

  19. Heavy rain drenched New Delhi, providing relief from the humidity. The India Meteorological Department forecast more rain in the next two hours for various areas. Northern India, including Delhi, is likely to see moderate rainfall this week. In June, Delhi recorded 235.5 mm of rain in a 24-hour period, the highest in 88 years.
    #Delhi #IMD #MastIndia #MastodonIndians #India @mastodonindians
    timesofindia.indiatimes.com/ci

  20. India experienced its hottest May in 36 years during the 18th Lok Sabha elections, with record-breaking temperatures reported by IMD. The high temperatures influenced voter turnout, especially in the north, as per meteorological and political analyses.
    #India #May #IMD #MastIndia #MastodonIndians #India @mastodonindians
    timesofindia.indiatimes.com/in

  21. Intensity of heatwave in northwest, central and east India to reduce over next few days, says IMD

    The southwest monsoon had advanced further into the central Arabian Sea and the remaining parts of Lakshadweep, Kerala and Tamil Nadu, the weather agency said.

    #heatwave #SouthwestMonsoon #ClimateChange #environment #IMD #india

    scroll.in/latest/1068696/inten

  22. According to the India Meteorological Department, some relief from the brutal heatwave may be at hand starting tomorrow.


    5/n