GB3DT is currently suffering some intermittent interference at various times throughout the day. It typically results in the signal being chopped every second and renders GB3DT useless. Being secondary users of both the physical real estate and of the frequency band, does have its downsides!
We are aware of the source of the interference and are working to a resolution – hopefully by the end of Jan 2021.
To check whether the repeater is currently being affected by interference, send a * (star) on DTMF and the repeater should respond with its identification and the current time. Further instructions are available on the SVXLink Node Page.