R de Groot

@ElecNotes It's rubbish, lots of "de-sensing" and overloading due to the absence of decent frontend bandfiltering and the use of a single chip transceiver ... have you do some real measurements ? , i guess not, it's simple: quality for 30 $ is not possible.

Watch Out - There’s a New Ham Radio HT! For years, the Baofeng UV-5R has been the undisputed king of budget handhelds. But it’s starting to show its age. After putting the new TIDRADIO TD-H3 through its paces, I think we finally have a "Baofeng Killer" that brings modern, professional utility to the budget price point. In my latest review, I explore why this compact dual-bander is rapidly becoming the go-to choice for Hams, hikers, and SOTA/POTA enthusiasts. Here are 3 reasons why the TD-H3 stands out: ✅ Revolutionary Programming: Forget hunting for specialized "K-plug" drivers. The TD-H3 features native Bluetooth for field programming via your smartphone and a direct USB-C port that handles both charging and data (CHIRP compatible!). ✅ Superior Display & Build: It’s more compact than the UV-5R but feels significantly more solid. The 1.44-inch color TFT display is vibrant and high-contrast—a massive leap forward from the dated, segmented LCDs of the past. ✅ Better Receiver Performance: While it’s not a high-end Icom or Yaesu, the TD-H3 handles local interference and "de-sensing" noticeably better than its predecessors. Plus, the AM Airband reception is surprisingly clear. The Verdict? If you’re looking for a "glovebox" radio or a reliable hiking companion that doesn’t feel like a toy, the TD-H3 is arguably the best value on the market today at the $30–$35 price bracket. Read the full technical breakdown, including comparisons with the Quansheng UV-K8 and detailed performance specs, over on Electronics Notes: 🔗 electronics-notes.com/store-shop/ham… #HamRadio #AmateurRadio #TIDRADIO #TDH3 #SOTA #POTA #RadioReview #TechReview #ElectronicsNotes #hamr

@MehdiHacks What do you need 80 mhz bandwidth for ?

80 MHz of instantaneous RF bandwidth, captured with LimeSDR Micro over PCIe. Currently my largest-bandwidth SDR.

@shortwave78 Absurd , this model is totally not suited for this type of use , way to much knobs, settings and unneccessary features made for radioamateurs ... emergencyservices never use this type of toy ... they use simple to use and channelized radios like in use by military or ships.

🇮🇹👨‍🚒🚒Italian firefighters have purchased a significant amount of ICOM IC-7610 All Mode HF Transceivers in “Corpo Nazionale Vigili del Fuoco” special version

The design should deal with the flow of electrons where electrons flow away from roundings and towards pointy shapes of the element , nearby ground should be avoided to minimise loss of potential (spraying).

Mini Whip is not a Antenna ! It is a high impedance sensor amplifying the potential between the sensor-plate and ground-potential Design should minimise charge leaking to ground Not one radioamateur understands this, they want to apply classic wavelength theories on it, wrong !

Uses different wavelengths to make objects standout Depending on purpose or object it changes color. It's Resonance, Fluoresence, Spectrumanalysis. 300~800 nm. Incl UV, used to inspect food, drinks. All science: Nature figured it out already.

Adjusting reflected wavelength.

Hummingbird doing "Electronic Warfare" It has a "Tunable Wideband Reflector Antenna" 100's of reflectors reflecting sunlight to a target Reflectors can be directed at any target Liquid crystals act as electrically tunable filters Use: Sexual Selection, Defense, Foodanalysis

2026 April 05 | Comet "C/2026 A1 Maps" Looks like it desintegrated while passing the Sun. The cloud of leftovers & debris still moving trough space

Inspite others saying it did not survive i'm not convinced yet since i now see it showing up at the other (right) side of the sun. (green line) Not shure what happens next.

2026 April 04 Comet "C/2026 A1 Maps" closely passing the Sun. Will it survive or vaporize ? Source for video: Spacecraft Soho Lasco C3

Emergency comms via satellite, works in all outages or SHTF. Worldwide coverage, 66 Irridium Satellites (1600 Mhz band) Low cost solution: 500 € + Monthly subscript 10 € p/m Device: "Garmin inReach Mini-3 Plus" Device to Device comms even when groundstations are down.

Top-10 Afro House Latin Dance Party Remakes 2026 List compiled by me from 1000's new videos in this genre. Many tracks are (home) re-made using Ai, these are the best. Playlist here: youtube.com/watch?v=8gS9wr…

Listening to the Universe: Natural Radio Signals from Earth & Space. List of frequency-bands of natural phenomena that emit radio-signals. Many can be received on a SDR or simple receivers.

@PatrickPierre73 Laptop + SDR , you walk around, or on the bike or ski's ha ha , and find the source (strongest signal) ... use a telescope or loop or ferrite antenna. Or the lazy-way: use a "QRM-Eliminator" (50 €) which can phase out the interference.

Any idea what type of device could cause this kind of interference on MW? (it ranges roughly from 0.5 to 4 MHz, but it's most intense on medium wave.)

Tunable Cavity Helical Filter 110~180 Mhz Homemade from copper & maximal optimized Bandwidth 1~10 Mhz, Insertion-Loss 0.3 dB Max P: 125 Watt, Materials cost: ~100 €. Best reception & S/N ratio, Less interference. Used for SDR receivers which have no bandfiltering

Fireball over Europe , Radio-Reflection Signature. Date: 2026-03-08 , Time: 17: 55:06 GMT. Receiver: Brams Kirchberg Luxemburg. Beacon-Transmitter: Dourbes @ 49.990 Mhz. IMO Fireball-iD: 2026/1567 Pieces found in Koblenz-Guls Germany. I was able to find it's traject.

@msahsorin @sciam @msahsorin , Nothing new since the article is about "Near Infrared" and not (Human) Visible Light ... it is long known in all kinds of sciences that infrared and near-infrared in a lesser extent will penetrate bio-materials ... a little clickbait to post here that it is Light.

Earlier this year, we showed the human brain emits ultraweak light now featured in @sciam : scientificamerican.com/article/your-b… But a bigger question remained: how does light propagate through brain tissue - especially in neuroimaging tools like fNIRS? This study provides the first robust evidence: light can travel through the human head -not just scatter, but be guided by cerebrospinal fluid and tissue geometry acting as optical waveguides. It reshapes how we think about light in the brain, mfrom chaotic diffusion to structured, potentially information-carrying flow. A paradigm shift for deep, non-invasive brain imaging & biophotonics. 🔗 doi.org/10.1117/1.NPh.…

@Fraunhofer_FHR May i ask where did they get the domes (glass/plastic) from ?

Im Winter sind Lawinen eine große Gefahr. Forschende des Fraunhofer FHR nutzen Passivradar, um mit Signalen von Satelliten-Megakonstellationen wie Starlink und OneWeb Lawinen in abgelegenen Gebieten zu überwachen. Machbarkeitsstudie zeigt: Es funktioniert! fhr.fraunhofer.de/de/presse-medi…