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One for Kelly, Mike et al - Radio Communications.

AncientMariner
I couldn't help but notice a similarity between the picture at https://www.bbc.co.uk/news/uk-england-wiltshire-53132567 with the photograph at https://qrznow.com/wp-content/uploads/2015/01/Abh%C3%B6ranlage_Gablingen.jpg  This seems to suggest that radio communication is not as recent as you might think? ?

There used to be a Wullenweber DF Antenna at RAF Chicksands in Bedfordshire some years ago when the USAF had tenure. I remember seeing it back in the late 1960's from a coach on our way to the Shuttleworth Trust. Similarly from a ship passing Galeta Island, Panama. Both these now long gone, but the locations still visible in Google Earth. Other than the WW2 German work, most seem to have US origins and I was pleased to see that Plessey in the UK had an involvement too.

Clive

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    Using rings of antennas with an antenna at the middle,  and  combining the signals with the right phases and amplitudes to allow the user to select (or null out) a  signal  from a particular direction receive . This is 'old hat'.

    A wide band coherent receive chain and high data rate digitisation and storage on each antenna allows recording, and then potentially many hours after some event, the recorded signals can be re-combined with some desired  amplitude and phase to look at arbitrary signals of interest from one or more a specific directions.  This is the 21st century  game changer, as you can in effect go back and listen to something over again, but concentrating on (or removing) signals from a different angle.
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    Using rings of antennas with an antenna at the middle,  and  combining the signals with the right phases and amplitudes to allow the user to select (or null out) a  signal  from a particular direction receive . This is 'old hat'.

    A wide band coherent receive chain and high data rate digitisation and storage on each antenna allows recording, and then potentially many hours after some event, the recorded signals can be re-combined with some desired  amplitude and phase to look at arbitrary signals of interest from one or more a specific directions.  This is the 21st century  game changer, as you can in effect go back and listen to something over again, but concentrating on (or removing) signals from a different angle.
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