sábado, 14 de outubro de 2017

1090 Filter

I getting an hard time to decode some ADS-B signals, my antenna is not ideal (using a J-Pole for 2 M 70 CM) and only aeroplanes right on top of my location wore decoded, so time for a filter. I got an ADS-B filter for 1090 MHz and now I can pick up ADS-B signals in a 150 Km radius, the next pictures show why:
No filter


1090MHz filter
With the filter the main difference is obvious, no more FM stations an less GSM.
These pictures wore made using qspectrum, and the filter is this one.