Full report claude.ai/public/artif... #hamradio #spaceweather #HFPropagation

Before a #CME hits Earth's magnetic field, high-speed solar wind streams and energetic particles can already reach Earth. These interact with the ionosphere, particularly the F2 layer. This interaction can temporarily increase ionization in the upper ionosphere #hamradio #spacewx

Effect of Solar radiation on #HFPpropagation #spacewx 1–8 Å = “bad news” for HF (absorption, blackouts) 100–1000 Å = “good news” for HF (increased ionization, higher MUF) Data on my website grafana.gafner.net/goto/7LIFgS6... #hamradio

As a rule of thumb, when the 10.7 cm solar flux is above 150 and the Kp index remains below 4, you can expect great #DX condx on the higher HF bands like 10 m, 12 m, 15 m, and 17m. Check the current #SpaceWX and key #HFPropagation indicators at my website grafana.gafner.net/d/kAZyp6bMz/...

Last week, 10m DX was picking up 🚀 Expecting to see even better condx in the coming weeks

The forecast for the DX performance of the 10 m band is far behind that of September 2024

Combined chart showing the average annual Kp and Ap indices from 2020 to 2025 #sc25

A high Solar Flux Index generally improves HF propagation by raising the MUF and opening up the higher bands. SFI is currently at 226, and DX on 10m is picking up is.gd/WoY6pk

SSB radio enables long-distance communication without satellites or infrastructure, using HF bands to bounce signals off the ionosphere. A lifeline for sailors beyond VHF & cellular range sailmagazine.com/cruising/sea... #hamradio #amateurradio #sailing

WSPR is a great tool to: - Optimize your RX/TX - Assess your HF Propagation - Compare performance with other stations - Compare performance of Antennas - Compare RX performance of Radios/SDRs Some of the tools I use on a daily basis wspr.hb9vqq.ch wspr.live wspr.rocks

The DX peak for the high ham radio bands was likely in 2024. Autumn MUF will show #sc25 #hamradio #spacewx

I was reaching out to ARDC to check if this project would qualify for a Grant. Unfortunately, individuals don't get grants without fiscal sponsors. Furthermore, ARDC wants to have evidence of demand from potential future users. Too many roadblocks...

This is bloody brilliant. I've spent months optimizing my RX and it's finally a top-notch receiving station. Over 1000 WSPR reporters in the last 24 hours, which I rank 12th for unique spots and 33rd for distance. Not bad at all considering my suburban QTH, far from an RFI quiet location

First draft of a new Project - Development of an AI Model for Predicting Long-Distance HF Radio Skywave Propagation - long way to go ... Looking for SMEs Team members docs.google.com/document/d/1... #hamradio #AI #bigdata #spaceweather #spacewx #HFPropagation

I am taking a break from social media. I need a digital detox. I will continue to experiment and chase DX. 73 #hamradio

Deepseek's answer #hamradio

Question for the experts. Is there a difference in inductance between a copper tube and a copper rod with the same diameter?

Difference between the Wellgood and the N4CY Amp - RX-888 HF Spectrum #hamradio #swl

I have found a way to reduce the loop inductance of a magnetic antenna by 20% (using the same 22mm copper tube). I discovered this 5 years ago out of curiosity and it improved the RX, but I didn't know why at the time. Now I do... I'll have to confirm it with another 24 h WSPR comparison.

CQWWSSB 2024 - SOAB QRP All Bands #9 World - ATAS 120 FT450D #hamradio

That my new radio setup inspired of @hb9vqq.bsky.social work i duplicate that setup for all band 144/222/432/902/1296/10G that replace the need of the costly flex6700 and permit to monitor all VHF band instead of only 2 #hamradio #VHF

More than 7000 WSPR Spots past 24h where distance > 6000 km at HB9VQQ - RX is King #hamradio #WSPR

The RSR200 will be in series production starting in January 2025. The price target is just below 1000€ and includes 2x 16-bit ADC, 2x HF inputs 0-71 MHz, 1 VHF input 70-250 MHz, diversity reception, and 1 Gb/s SFP LAN interface. The 2 ADCs can be interconnected in parallel or serial order #hamradio

Just worked 7Q7EB - TX Flex 6600 RX Airspy HF+ Discovery #hamradio #DX #SSB

#Solar activity past 90 days #hamradio #spacewx

Mitigating #OTHR #QRM with RM Noise #hamradio ournetplace.com/rm-noise/ youtu.be/j9qzEOivKTk

80 and 40m band DX propagation behind expectations #hamradio

10m Band DX Propagation - 2022 to now #hamradio

The Airspy receiver and an ALA-1530-LNP will be installed at the Marion Island Research Station, a particularly quiet RX site. #hamradio #HFPropagation

We are in the planning phase of a new permanent multiband WSPR receiver on Marion Island - Callsign ZS8A using an Airspy HF+ Discovery - scheduled deployment in April 2025 -Thanks to the South African National Space Agency #hamradio #spaceweather #HFPropagation

The goal of this design is to reduce loop inductance. Low inductance = better performance. Let's see if that can be proven #hamradio #swl

On the air now #hamradio #swl

#hamradio #swl

It's amazing an SDR design from 2007 still performs extremely well today. Perseus vs Airspy HF+ Discovery. WSPR decode shootout on the 40m band #hamradio groups.io/g/wsprbeacon...

Prototype of the parallel loop (Ø 1m each) construction for HF RX. The best I could do, it‘s not a perfect construction 🤷‍♂️ Weight incl. mast excl. amp exactly 5kg. Special thanks to Colin @MM0OPX and Robin @rdavies6. Great cooperation guys🙏 #hamradio #swl #LoopAntenna

Making good progress - 2 parallel RX loops for HF #hamradio

Very interesting!

There’s a nice magloop calculator at miguelvaca.github.io/vk3cpu/maglo... but it can also calculate inductance of different shapes of Cu & Al pipe. For your large loop (for instance), set a=22mm; b=1.3m & N=1 (for a single turn loop). You might want to experiment with the N =2 (P) option😉

What makes a good HF RX Loop? One with a low inductance (~1 μH) and a large conductor area - fat pipe #hamradio #swl

More work has just arrived - The legendary Perseus and an N4CY loop amp #hamradio #SDR #swl

I found a potential source, there might be more but this one is the closest, the strongest, and matches the PLC pattern 100% #hamradio #PLC #QRM #swl

Let‘s take a walk and try to locate the source of the PLC #hamradio QRM #swl

If you have an RTL-SDR dongle, Airspy R2, Airspy HF+, AMSAT UK Funcube Pro+ or RX-888 Mk II then ka9q-radio is a must learn cli-based SDR package. Very flexible & capable of monitoring hundreds of frequencies simultaneously. However only the RX888 gives you the gorgeous 30Mhz wide waterfall display!

I start to like the RX888 as a wideband general-purpose HF SDR. Unlike the Kiwi it provides better Frontend Gain control and the number of ka9q-web users is limited only by the CPU power of the host PC #SDR #hamradio #swl

Access is open again rx888.hb9vqq.ch:8081. Make sure to use HTTP instead of https

That's how I apply ATT to the KiwiSDR to prevent ADC overruns via crontab after assessment using the programmable USB Attenuator #hamradio #swl

Powerline PLC QRM in my neighberhood recorded with the RX888 - Ham radio bands are notched #hamradio #swl

A Perseus SDR is on its way to me for a comparison. I won't be able to make an amateur radio QSO this year... #hamradio #swl

That's why you need to connect the RX888 to an SS USB port #hamradio #swl

Listening to my favorite radio station Radio Caroline while hacking through the night - Red Team - RX888 web SDR