Roger G3XBM's (Mainly) Amateur Radio Blog

These are very small RX antennas that can be very effective at VLF, LF and MF.  As you move HF, they get less effective. The main issue is t...

  At VLF, LF and MF, external noise usually is the limiting factor.  Making the RX antenna bigger also increases the noise picked up, meanin...

This tiny antenna is very effective on VLF, LF and MF. Versions are available which can be bought ready made or as kits. See https://sites.g...

These antennas can be very effective on VLF, LF and MF. They are extremely small but work every bit as well as big antennas. They are the b...

There is a common myth that VLF, LF and MF antennas have to be big. Whilst this is true for radiated TX antennas, this is absolutely not tr...

It is total myth that VLF Rx antennas have to be big. They do not! ! Very effective VLF, LF and MF RX antennas can be very small indeed. Som...

It is some years since I have tried these antennas. They are RX only and can be very effective at VLF, LF and MF. Some use them on RX up to...

Over a year ago I bought an E-field probe from PA0RDT . It has still to be erected! In the meantime I have been busy on 472kHz WSPR usin...

Looking back over 2018 I see I failed in at least one project aim!  I actually bought the e-field probe, but it has still to be erected. May...

These are RX only antennas, but they can be remarkably successful on VLF, LF and MF. Years ago I made my own, but these days building and e...

Many years ago, I tried looking for my tiny 137kHz beacon with a small E-field probe mag-mounted on the car. After seeing the signal quite...

It is a common misconception that big antennas are needed for MF, LF and VLF reception. This not true!! Some very small antennas work ver...

There is little doubt that I shall have to try one of these on LF and MF and possibly other bands next autumn. I have the time from now un...

Some years ago (in the days when I was fit and well) I tried these compact receive only antennas on 137kHz and higher bands. They work on ...

A very successful antenna for VLF, LF and MF receive only is an E-field probe. Ideally these should be mounted outside the house with som...

Image of miniwhip on VK1OD's website VK1OD has done an interesting analysis of the PA0RDT E-field probe miniwhip receiving antenn...

Route taken from A to F (about 4km) Today I did a fascinating experiment on 8.977kHz VLF using my 5W earth mode transmitter and a mag-mo...

Today I started some tests at 8.97kHz with my mag-mounted E-field probe (EFP) on the car roof. As usual, the transmitter was my 5W QRSS3 bea...

This afternoon I put a new page on my www.g3xbm.co.uk website describing the 137kHz E-field probe antenna used in my recent "drive a...

This afternoon I started my tests on the 137kHz band again. With my 8W (RF out from the unit - ERP will be uW level) crystal controlled beac...