At last I seem to be getting somewhere with the LimeSDR transceiver. Yesterday I started using Pothos to create an FM radio and today I was able to re-transmit one of my local radio stations to another frequency just before my local telecoms regulator discovered what I was doing.

This is an important step towards producing a proper 4G signal repeater - there's no point in diving in right at the deep end so a simple transmit is a good step forwards.

The Pothos file for this project is here on this Hackaday page under the 'Files' section.

Please could someone tell me why I was getting double transmission either side of the selected frequency? This can be seen on the video below: