I'm working on an educational app for #amateurradio. In it I have visualizations for different factors that affect radio signal propogation.
My AI agents hit a quality plateau. Prompt tweaks weren't helping.
The problem? My agent was anchored to MY understanding of the domain, reflecting my blind spots back at me. 🤦♂️
Here's how I got through it:
https://philjohnstonii.com/blog/fresh-eyes-how-i-got-past-my-agents-quality-ceiling
Ever wonder why your HF signal skips over the next town but hits the next continent? 🌎
Master NVIS (Near Vertical Incidence Skywave) to close the gap! Perfect for regional nets and emergency comms when the repeaters go down.
Check out the definitive guide here: 👇 https://vu3dxr.in/near-vertical-incidence-skywave-nvis-the-definitive-guide-to-reliable-regional-hf-radio/
Learn how NVIS (Near Vertical Incidence Skywave) enables reliable short-range HF communication, including propagation, frequencies, and use cases.
Ever wonder why your HF signal skips over the next town but hits the next continent? 🌎
Master NVIS (Near Vertical Incidence Skywave) to close the gap! Perfect for regional nets and emergency comms when the repeaters go down.
Check out the definitive guide here: 👇 https://vu3dxr.in/near-vertical-incidence-skywave-nvis-the-definitive-guide-to-reliable-regional-hf-radio/
Learn how NVIS (Near Vertical Incidence Skywave) enables reliable short-range HF communication, including propagation, frequencies, and use cases.
Ever wonder why your HF signal skips over the next town but hits the next continent? 🌎
Master NVIS (Near Vertical Incidence Skywave) to close the gap! Perfect for regional nets and emergency comms when the repeaters go down.
Check out this definitive guide: 👇 https://vu3dxr.in/near-vertical-incidence-skywave-nvis-the-definitive-guide-to-reliable-regional-hf-radio/
Learn how NVIS (Near Vertical Incidence Skywave) enables reliable short-range HF communication, including propagation, frequencies, and use cases.
Ever wonder why your HF signal skips over the next town but hits the next continent? 🌎
Master NVIS (Near Vertical Incidence Skywave) to close the gap! Perfect for regional nets and emergency comms when the repeaters go down.
Check out this definitive guide: 👇 https://vu3dxr.in/near-vertical-incidence-skywave-nvis-the-definitive-guide-to-reliable-regional-hf-radio/
Learn how NVIS (Near Vertical Incidence Skywave) enables reliable short-range HF communication, including propagation, frequencies, and use cases.
The Ultimate Guide to Affordable NVIS Comms (How to Build a Regional Off-Grid Radio Box)
https://www.youtube.com/watch?v=ZZxR-qtGH7c
I build a $200 portable HF radio box and test whether it can really communicate 100+ miles off-grid using a technique called NVIS. This video walks from first principles to real field tests, showing how normal people can stay connected when infrastructure fails...
Was ich hier in Patagonien schon häufiger gesehen habe:
NVIS Kurzwellen -Antennen bei Hilfsorganisationen. Krankenhaus, Feuerwehr usw. Anders kann man hier wohl die Verbindung über die Berge nicht halten, ohne alles mühselig mit VHF-Repeatern voll stellen zu müssen.
Alles niedrig hängende Breitband-Dipole nach dem T2FD Prinzip.
I can't find for sale anywhere a 1:4 #balun for HF. It is for a low height 40m inverted V #NVIS #antenna. Military versions such as #AS-2259 use the custom coax support pole as an impedance transformer.
To be clear, I mean 12.5 ohm balanced antenna side to 50 ohm unbalanced coax side. The ones for sale on eBay/Amazon seem to be mislabeled 4:1 ones.
Making one isn't an option: my hands don't work properly.
Anyone any ideas.
Phil
VU3DXR
OccuWorld
Ekki DF4OR
Peter
LB5JJ
Jef Allbright