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Baofeng UV-5R plus – Defective antenna

I don’t use this cheap handheld often, on the contrary, I rarely use it. Anyway, I prepared it for the holiday trip, to hear some local Hams and have FM chat. Once I got there I turned on the small radio and with great surprise I could not hook up any repeater, even the FM […]

Useful support for cheap sdr receivers

Since we had the possibility to use the cheap RTL-SDR receivers for amateur radio purposes, I encountered some problem on how was possible to place them in my radio station. Usually fix them directly in the PC USB socket is not an easy way, often the PC is far from the antenna cable inlet and […]

3rd of September strong thunderstorm

In the afternoon of the 3rd of September, a strong storm broke down in central Italy with very violent electrical events. Tens of thousands of lightning strikes the peninsular skies while our meteor scatter station at the APA Latina observatory was active. At that time the GRAVES transmitter was not in operation (perhaps […]

ARISS SSTV Award – Owen Garriot commemoration

Diplome (1)

The first ham radio operator in the space Owen Garriot – W5LFL Here under the received images from ISS in SSTV PD120 mode #gallery-1 { margin: auto; } #gallery-1 .gallery-item { float: left; margin-top: 10px; text-align: center; width: 33%; } #gallery-1 img { border: 2px solid #cfcfcf; } #gallery-1 .gallery-caption { margin-left: 0; } /* see gallery_shortcode() in wp-includes/media.php */

Meteor scatter “cloud”

On June 14th APA radio meteor scatter station detected a persistent and widespread “cloud” of debris for about 75 minutes after the 20:30 UTC. In the video below is it possible to see how the backround noise rises highlighting the reflection of the timed GRAVES transmitter carrier.

In the next image is […]

APA – lan|Meteor scatter antenna improving

After about a month and a half from the beginning of the meteor scatter project with a satisfactory success, we wanted to make a small improvement to the reception system by doubling the antenna. From the beginning the antenna was a four element 1.5 lambda boom length with a gain of about 8.5 dbd. We […]

The project: how to “show” the falling stars to the blind

It’s more than three years that I monitor VHF for meteor scatter signals thanks to the French GRAVES radar near Dijon. This is a bistatic radar that transmits a CW signal at 143.050. With a simple radio system is possible to receive the radar signal reflected by the meteors ionized plasma that these […]

Tentativo di ricezione eco dell’asteroide 2012 TC4

Questi giorni si avvicinerà alla Terra l’asteroide 2012 TC4 ad una distanza veramente minima per un oggetto spaziale, domani alle 7:42 ita il picco di massimo avvicinamento.

Con quasi le stesse modalità del sistema meteor scatter sto provando a ricevere sulla frequenza del GRAVES l’eco dell’asteroide che transiterà a circa […]

My Perseid 2017 time lapse video

Quadrantidi 2017: un piccolo report (ITA)

Grazie alla positiva esperienza avuta con le Perseidi della scorsa estate, da poco prima di Natale ho pensato di installare una postazione fissa che mi permettesse un monitoraggio pressocchè continuo degli eventi meteorici tramite la ricezione in VHF del segnale del radar GRAVES.

Filtro in costruzione

Dopo un primo periodo […]