ARLA/CLUSTER: Nunca se diga que algo é tecnicamente impossível - Full duplex! Tx and Rx on the same frequency - at the same time.

[João Costa > CT1FBF]

Full duplex! Bristol boffins demo Tx and Rx on the same frequency - at
the same time

Transmitting and receiving on the same radio frequency, at the same
time, has been demonstrated by the UK's University of Bristol in a new
YouTube video.

The system being used is running 900MHz and 1800MHz with exactly the
same equipment.

There are a number of companies working on this technology, called
full duplex radio, a technology traditionally viewed as being
extremely difficult to implement – if not impossible.

However, what has now seemingly made it possible are improvements in
processing, which allows the noise of the transmitted signal to be
subtracted from the received signal.

One of the first patents on full duplex was filed by UK-based
electronics, defence and telecoms company Plessey in 1980, for a
combat radio repeater using the tech. This was called "Groundsat" and
was used by the British Army. There was also a patent filed by Bristol
University in the 1990s.

Read more and watch the video here
http://www.theregister.co.uk/2015/08/13/
full_duplex_radio_tech_bristol_uni/

Our thanks to Stephen, G7VFY for spotting this item