Roger G3XBM's (Mainly) Amateur Radio Blog

This was the RX VLF loop antenna I used for my earth-mode tests when I was fit. It was tuned to the RX frequency that was usually about 8-9k...

Last year, I used this tiny antenna on many HF bands.  It is only about 50cm across and sits on the shack windowsill, but worked remarkably ...

There is widespread Es on 10m this morning. A few moments ago (it is now 0917z) I turned on 10m FT8 RX with the FT817ND and the tiny indoor ...

As you may know, I have no external antenna for 10m at present. Instead I use the 50cm loop on the shack windowsill.  It is extremely hard ...

For a change I am on 10m FT8 RX with the FT817ND and the tiny indoor loop (50cm diameter) antenna.  Plenty of Europeans being spotted by Es....

It is now 0855z. I have been on 10m FT8 RX for about 30 minutes and have spotted 11 stations so far using the 4 transistor RX and indoor loo...

My loop antenna works better than I expected. I stayed off 10m last year mostly as I did not have a suitable external antenna.  At the momen...

As you may know I have had a good deal of success with tiny indoor loop antennas. The photo shows the loop for 10m.  At the moment I have no...

This is the inside of my loop antenna used successfully on 20m FT8 to 10m FT8. I am amazed how well it works.  The wire used for the loop is...

One of the great advantages of QRP is in the design of loop antennas for TX. With 100W, the voltage at the high impedance part of the loop c...

This afternoon, I tried in vain, to mend my "better" 10m loop antenna. I failed.  Before, there was a distinct peak when tuned and...

As the IC-705 is becoming more widely available, minds are turning to portable antennas.  From my own limited experience, I can say that mag...

For the last few months I had been unable to get on 10m as my external antenna was down. In the end I rebuilt my loop antenna which I last...

Yesterday, I modified my 10m loop to make it easier to tune. The measured capacitance at resonance was just under 40pF. I replaced the 365...

Later today, all being well, I intend to finish the rebuild of my loop for 10m. I have still to decide on WSPR or FT8. Before doing it, I ...

At our old house, I did some tests with a loop antenna using central heating pipe. More recently I have been using a Wonder Wand loop th...

Normally, loops are matched with a primary winding about 1/5th the size of the main loop. In my case the matching is done using a tapped t...

Jay, W5OLF sent me a photo of the loop antenna he has been using on 10m WSPR. The loop is quite small, but the wire diameter quite large, ...

As I have been asked about this, here are some details. It has been used for 20m,17m and 15m. with powers up to just over 10W. It should...

After the recent experiments with the Rybakov antenna, I am trying the tiny magnetic loop antenna on the windowsill indoors (see photo). A...