Contester and DXer
Lisboa, Portugal
Joined March 2009
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📡 Introducing CT1BOH Interactive Atlas!
qsl.net/ct1boh/Atlas.html
🌍 Rotatable azimuthal maps
📏 Distance & azimuth measurement
🧲 Geomagnetic latitude contours
🌌 Live NOAA aurora forecast
☀️ Day/night terminator
📍 Maidenhead grid centering
Built for DXers & contesters!
New version for CT1BOH Live HF Propagation Quality! 📡Beyond spot counts, understanding Live Propagation Quality, SNR, high-latitude paths (≥50°/60°/70°) and day/night exposure.
🌍 JA–EU, EU–USA & JA–USA Corridors | 10–40m
📈 Rolling propagation history qsl.net/ct1boh/propindex1.ht…
🌍 Exploring HF propagation in real time!
qsl.net/ct1boh/propindex1.ht…
New: 🎛️ Select any band, region (World, JA, EU, USA) or Maidenhead grid to explore live propagation paths.
73, CT1BOH
🌍 Can we actually see where HF propagation begins and ends?
My latest project visualizes worldwide HF propagation boundaries using thousands of live PSK Reporter reception reports on an interactive map.
📷 Explore it here: qsl.net/ct1boh/propindex1.ht…
José Nunes CT1BOH retweeted
After three months of work, the first beta version of my antenna calculator is read, now available in English as well.
antennenrechner.boscolab.de
#hamradio #amateurfunk #Antennasimulator
It is never too late to try to get old QSL cards to fill in missing DXCC Challenge slots - TURKMENISTAN #11 most wanted
José Nunes CT1BOH retweeted
Bullseye! Our Sun finally aims straight, launching a big solar storm directly at Earth. Impact: Early October 9 UTC time. This is the best coronal blast wave I've seen in a long time. Kudos to @HaloCME for the analysis despite being on the mend. Please help me wish an esteemed colleague and SDO/AIA team member a speedy recovery!
Your antenna may not be what you think it is.
S53ZO’s drone measurements show how towers, antennas, guy wires, terrain and ground can dramatically distort real HF patterns. Verticals can be far from omnidirectional, arrays can develop deep nulls youtube.com/live/O6b00FVW8tA
Not good for propagation but beautiful to watch
New images captured by SMILE, a joint mission between ESA and the Chinese Academy of Sciences, show the entire auroral oval surrounding Earth’s North Pole in ultraviolet light, a global view that has not been seen in this way for around 18 years.
The video also shows the ring becoming brighter during a geomagnetic substorm, when stored energy in the magnetosphere is suddenly released and particles are accelerated toward the polar regions.
As these particles enter the upper atmosphere, they excite atmospheric gases and produce the auroral glow.
Observing the aurora from space makes it possible to study it as a complete, dynamic structure rather than only from individual locations on the ground.
Even though the path of totality is relatively narrow, the varying levels of solar obscuration around it could create interesting propagation opportunities across 3.5 to 10 MHz
August solar eclipse offers an opportunity to test nighttime propagation during the day. Interesting for North American stations: around 17Z, they may have a chance to work Asia on the low bands while still in full daylight, as the eclipse temporarily reduces D-layer absorption.
José Nunes CT1BOH retweeted
Solar Cycle 25 is declining faster than any of the major predictions at its beginning. It is trending below all curves in this plot by @helio4cast. The cycle is declining ahead of all predictions, the closest still being by @swmcintosh al., 2023 (and SC25 still trending 6-9 months ahead of it). Smells like solar minimum possibly as early as 2029-2030?
July was yet another slow month as Solar Cycle 25. The monthly sunspot number reached 78.1, way down from the peak of 216 in August 2024 - less than two years ago. Solar Cycle 25 is declining quite rapidly, we are now at about the same activity as in 2022-2023. Frankly, it kind of feels like SC24 right now. Perhaps not quite as bad, but it is really slow. Will we hit solar minimum before 2030?
José Nunes CT1BOH retweeted
🇫🇷 Un atoll français perdu dans le Pacifique, assailli de toutes parts.
🌊 Clipperton est un minuscule atoll de 1,7 km² à 11 000 km de la France qui offre une zone économique exclusive de 436 000 km²
🦈 Ce territoire isolé et cerné de requins est aujourd’hui menacé par les rats et la surpêche souvent illégale.
😠 L’atoll est également envahi par des déchets plastiques apportés par les courants marins.
⚠️ Sans action rapide, ce territoire ultramarin risque de perdre son équilibre écologique.
🛡️ Faut-il créer une base permanente pour protéger cet écosystème et affirmer la présence de la France sur ce territoire stratégique?
📼Vidéo TF1 : 23 janv. 2026
Just worked RI0BU after RI1PC, RT25AA and RI0BW. Just missing RI0BI to make a clean sweep from Artic's Legends rt9k-club.ru/en/index.html
José Nunes CT1BOH retweeted
Today a coronal mass ejection launched from the Sun towards Earth and the northern flank is expected to impact us around July 28th. Here is the awesome visualizer used: swx-trec.com/h3lioviz/visual…
José Nunes CT1BOH retweeted
🚀 Introducing the CW4EVER Callsign Trainer
A free online platform
cw4ever.eu/trainer/
Features:
⌨️ Typing Trainer
📻 SSB (Voice Trainer)
📡 CW Trainer
🏆 Worldwide rankings
🌍 International statistics
#CW4EVER #HamRadio #AmateurRadio #Contesting #DXing #CW #MorseCode #SSB