No Aircraft
Air Traffic Control Developmental
Training / Qualification; Situational Awareness; Communication Breakdown
ATC Issue All Types
Equipment / Tooling; Procedure; ATC Equipment / Nav Facility / Buildings
[My trainer and I] had just assumed the Local Control Number 1 position to begin training and immediately lost all radios on our ETVs [Enhanced Terminal Voice Switch] system. At the same time Ground Control lost all of their radios and the ATIS frequency was not working either. My trainer immediately took the position and tried the emergency backup jacks in the tower cab and neither [Ground Control] or [Local Control] worked. My trainer then began to use the portable radio and had to work Ground Control and Local Control due to our facility only having 'one' [radio]. We remained in alert status for the next 2-3 hours until FAA Technicians arrived. The very next day the same problem occurred which put us back in alert status.My recommendation is for us to have a 'second' [radio] backup radio for Ground Control to relieve some of the workload on [Local Control] when we have this situation in the future. Usually at most of my previous facilities we had two radios; one for [Ground Control] and one for [Local Control].
Hayward Tower Controller reported losing radios and having to use one back up radio between all the positions in the Tower.