What in the world is this signal?
Posted: Sun Mar 12, 2023 6:04 pm
I've been looking around YouTube at international sirens, and came across Severnside, UK's siren system, made of a dozen Federal Signal Mod 5020s and DSA6s and operated by a nearby industrial facility. I expected the sirens to have relatively normal signals, but their warning signal made me question if it was even real (which it is). Their all clear signal is just steady tone (which I expected.)
https://www.youtube.com/watch?v=OGUuKEXp_RE
https://www.youtube.com/watch?v=vei8lBeSozM
The sirens do two cycles of five whoops, then a normal windup, then eight pulse blasts. The signal is essentially just the "shelter in-place" sound but why not use a simpler signal like wail or hi-lo tone? Is there a specific reason why the signal is like this or is it just how the industrial company wanted it?
https://www.youtube.com/watch?v=OGUuKEXp_RE
https://www.youtube.com/watch?v=vei8lBeSozM
The sirens do two cycles of five whoops, then a normal windup, then eight pulse blasts. The signal is essentially just the "shelter in-place" sound but why not use a simpler signal like wail or hi-lo tone? Is there a specific reason why the signal is like this or is it just how the industrial company wanted it?