Roger G3XBM's (Mainly) Amateur Radio Blog

Way back in 2010 (when I was fitter!) I used to enjoy going out to see how far away I could detect my VLF earth-mode beacon running 5W. The ...

Looking back over some of my old photos, I came across this photo of my 5W earth-mode VLF transmitter, that was last used over 10 years ago....

Earth-mode experiments in 2011   This was my earth-mode signal 4.5km away from home in 2011 at 1.095 kHz using Spectran software on the PC. ...

This was the beacon TX I built for earth-mode tests at 8-9kHz. It can send either CW or QRSS at about 5W. It is some years since it has been...

In days past, I managed a fair bit of success with VLF earth-mode. This is a form of VLF communication that many can enjoy. Gear can be simp...

Ten years ago I was on 1.095kHz earth-mode.

It is many years now since my health allowed me to carry out VLF earth-mode experiments. Results obtained with 5W and simple kit amazed me. ...

Some years ago G6ALB did some earth-mode tests with me. He was running 40W and was a very strong signal with me 3km away in the next vill...

Years ago one of my favourite activities was experimenting with VLF earth-mode communications through the ground. I would put a beacon o...

My tiredness is still a problem but I am getting closer to restarting field work at VLF.  I bought a new soldering iron and have found a rep...

The yellow line shows the approximate 15m baseline used currently on MF WSPR. The red line shows the proposed new earth-electrode base...

Tomorrow morning, all being well, I hope to do a further test on VLF earth mode at 8.97kHz using my new Asus X101ch netbook using Spectran s...

Today I've been updating my VLF receiving kit ahead of doing some further field tests, probably on Monday. I've now changed my RX lo...

Today I did the first tests using my new 5W 8.97kHz beacon looking for signals at my usual "close" test site 1.6km from the home Q...

Today I completed the build of my new VLF beacon transmitter. The beacon puts out 5W into a 50 ohm load, which is very close to the resistan...

The output of my TDA2003 based VLF earth-mode transmitter is around 5W into 4 ohms. The new semi-permanent earth mode "antenna" ju...

This afternoon I installed a more permanent earth-mode ground system to use in forthcoming tests at VLF through to 500kHz. Instead of bringi...

30t loop on the ground feeding E-field probe An 8.971kHz earth mode (VLF through the ground) test was conducted today at 1.6km and 3.5km...

On Feb 10th I have been invited to talk to the Cambridge and District Amateur Radio Club on VLF through the ground although I intend to ...

In this first post of 2012 I thought I'd list the projects that are "on the to-do list" for the coming few months. As always, ...