Any idea what these do please and why are there 3 of em?

[GAP]

Yep, standard issue on Bachmann here in the US, would find it hard to believe that it was removed for the European market, which is normally MORE restrictive in terms of EM interference requirements.

Greg

Different parts of the spectrum used in different countries eg I was advised by the local amateur radio club that I cannot use Airwire 900 in Aust without attracting the attention of the spectrum managers.

 

[Greg Elmassian]

This is wideband RF interference suppression, so spans a wider range of frequencies, usually lower down than cell phone. the 900 band is one of those which is very inconsistent between countries.

I am a amateur radio operator also... N6RGZ

Greg