Roger G3XBM's (Mainly) Amateur Radio Blog

In 2010 I managed to see DK7FC on 8.970kHz using my earth-electrode antenna in the ground. Notice this took hours! Just a faint line. After...

Stefan DK7FC has been doing experiments at even lower frequencies! This was posted a few days ago. His attachment has NOT been included. ...

Stefan DK7FC is planning more VLF tests at 17.47kHz: "Hi VLF, For this week, i'm planning to start with new experiments on 17.4...

This was posted Saturday by Stefan DK7FC: VLF, After nearly 8 days the carrier is still on the air without an interruption, despite occas...

From Stefan DK7FC: "Hi ULF friends, Saturday night i build an active E field receiver optimised for ULF. It is using a BF862 fron...

From Stefan DK7FC : Hi all, Meanwhile my 1 week taking transmission, starting  01.FEB.2017 23:30 UTC on 2970.000000 ...

Paul Nicholson has successfully decoded a message on 2.97kHz from DK7FC using clever analysis. Hi Paul, Am 25.01.2017 19:30, schrieb Pau...

DK7FC has been testing at even lower frequencies: Hi ULF, Since a few hours i'm running 15 mA antenna current on 970 Hz, the 309 km b...

The latest ULF DX news from Stefan DK7FC : Hi ULF, In addition to the informations from older mails about this experiment, here are the r...

Stefan DK7FC has successfully decoded his radiated signal at 65km on 2.97kHz. He refers to an attachment that is not included here. &qu...

Several people have now built versions of my 472/500kHz transverter. The latest version is shown below which includes provision for an a...

There are some very neat ideas for simple LF receivers around that make use of programs like Spectran or Argo effectively as the second IF a...

There is a new VLF grabber at Darmstadt Germany that may be useful for 8.97kHz tests. It is at http://skmail.ikp.physik.tu-darmstadt.de/gvw...

DK7FC has been helping YV7MAE set up a grabber for 136kHz and over the last month they have been improving the system day by day. Last n...

Whilst I was away on holiday there was considerable activity around 8.970kHz from Europe with Henny PA3CPM now putting a consistant sig...

DK7FC, PA3CPM and DF6NM have all been TXing today around 8.970kHz with reception reports coming in from many of the western European grabb...

DK7FC's VLF E-field probe antenna Stefan DK7FC is well known for his experiments at VLF. Here is his circuit for the E-field probe h...

G3ZJO's reception of DK7FC on 8.97kHz Yesterday's test by DK7FC from his fixed location was a resounding success with receptio...

This is an extract of the note from Stefan to the LF-reflector about his tests last weekend: "Dear LF/VLF group and further VLF watche...

After a few false starts and faulty kit, I managed good copy of Stefan DK7FC 's signals on 8.97kHz this afternoon with my loop in the g...