Many thanks to SWLing Post contributor, Giuseppe Morlè (IZ0GZW), who writes:
I’m Giuseppe Morlè from Formia, central Italy on the Tyrrhenian Sea.
I want to share with you my latest ferrite antenna for listening; it is composed of 3 ferrites of 20 cm each in a tube for electrical systems with 2 separate windings, one for medium waves and one for short waves, 40 turns for medium waves, 4 turns for short waves. I use a 750 pf variable to tune the 2 windings and a switch is used to eliminate a winding. Since there is only one variable, if you listen to the medium waves I interrupt the winding of the shorts.
On shortwaves it is preferable to place the system on an iron railing which, due to inductive effect, behaves like a really long wire antenna.
For the mediumwaves it is enough to bring the receiver close to the ferrites and also in this case, the induction will have its effect with an excellent increase in signal and modulation.
The range of this portable antenna is:
- 520 to 1800 kHz
- 3.500 to 18.000 MHz
Here’s a video from my Youtube channel where I explain how it works:
I had previously built a similar antenna but with 12 cm ferrites–very portable.
Thank you for your attention and I wish you good listening.
73. Giuseppe Morlè iz0gzw.
This is brilliant, Giuseppe! I love how you never stop building and experimenting with various antenna designs! Thank you for sharing this with us!
Wow this is incredible, I’d buy this! Unlike the Greek guy that needs 3 or 4 different types to cover the same range (though the Q may be higher, I don’t know.)
A question I’ve wondered for a long time: do you think it would be possible to extend it down into the long wave region (both LW BCB & the 2.2km ham band) while keeping the existing upper MW & SW ranges?
Ciao, thank you Mike…
you should increase the turns on the medium wave coil and with a switch when listening to the long waves, double the turns …there are 40 turns on the coil for medium waves we have to put another 80 more or less, and with the switch turn them on or off when we want to listen to the long waves.
un saluto dall’Italia.