Do I Need A Filter?

[abcd567]

@pretoescuro

I’m using Pro Stick Plus with light blue filter

Cavity filter, if built & tuned properly will provide very good filtering.
However, an easier solution to remove GSM900 interference is to use Dark Blue “1090 MHz Only” filter.

Announcing the new 1090 MHz only bandpass filter!

FlightAware is excited to announce the availability of a 1090 MHz-only bandpass filter for the ADS-B community outside of North America. This is something many of you have asked for. The filter we’ve offered in the past wasn’t great at blocking GSM mobile phone interference that can be found outside of North America. This new filter is an economical bandpass filter option that provides better attenuation of 950 MHz GSM. Those of you building PiAware sites in urban areas or other areas with 950 M…

FlightAware 1090 MHz ADS-B Bandpass SMA Filter