Recycling an old Smartphone to easily remote VLF probes

All this started when I decided to move my home made geophone from my lab room to my cellar at about 3 meters under the ground. It was a better position for this device because of absence of electro-magnetic noise. Only a simple 220VAC socket and an incandescent lamp are located in the cellar, no […]

SAQ 1st of May 2018 transmission

After a while and some technical problem the VLF station SAQ from Sweden was again in the air today. Signal was very strong despite the noise created by statics and thunderstorms. I received the station more than 20 db over the noise level. Unfortunately a local noise appeared time to time exaclty on the same […]

IW4DXW 8270 Hz Carrier detected – Italian VLF QRB Record

After months of test I finally detected the VLF carrier signal from Riccardo IW4DXW. Today, probably thanks to a particular propagation condition on VLF, was possible for me to “read” during the entire daylight the signal from Riccardo’s transmitter. Unfortunately with the first rain drops the signal was cancelled from my spectrogram. But I don’t […]

Receiving DK7FC on 17 km band

In these days Stefan DK7FC is transmitting with a special license on 17470,1 Hz a CW signal. I and other Hams are trying to receive his signal. I already received Stefan’s signal on 8 kHz with a 47 uHz waterfall grabber, now I successfully tryied also a 424 uHz grabber. Here is an image of […]

VLF e Inquinamento elettromagnetico

Questo pomeriggio, durante un forte nubifragio con tanto di fulmini, l’energia elettrica del quartiere è venuta a mancare per circa 40 minuti. Questo proprio mentre lavoravo al mio sistema di ricezione per le VLF. Dopo un primo classico disagio, come quando si avverte sete se manca l’acqua corrente, ho voluto fare dei brevi test […]

First reception on 8270 Hz

Finally, thanks to Stefan DK7FC, I’ve my first “human” signal on 8 kHz band. Stefan was active for all the last week-end on the band to give me a chance to receive his signal, and pixel after pixel the signal apeared in this way: A well marked peak exactly on 8270.005 Hz shows the integration […]

Almost ready for VLF again

Ready again to receive VLF with my new loop. At the moment the antenna is located on the roof under the TX antenna for MF-LF.

The preamplifier circuit comes from the easyloop of VLF.IT with an OP27 and few others components.

The antenna is composed by 32 turns of 0.15 […]

Inside SAQ station Grimeton (Sweden)

Fantastic virtual tour inside the SAQ building