Broadmoor Hospital Carters Hilo, Alert.

[kswx29]

http://www.youtube.com/watch?v=FFLMdRvAl4I
Sounds a bit sick if you ask me.

[thunderbolt69]

It has a stuck damper producing the sickning tone.

[Robert Gift]

How does it work?
Same as a 3t22 with dampers?

[JasonC]

How does it work?
Same as a 3t22 with dampers?

Yup.

[Daniel]

This is a Klaxon siren, I believe. Dan Wisbey made a recording of one of these a couple of years ago (maybe even this siren), but one damper was stuck open. This is a much better recording. My guess as to why it is alternating so slowly is that when this siren was built during the cold war, most emergency vehicles in the UK used hi-lo air horn sirens that sounded a faster rate. This goes slowly enough so that it won't be mistaken for a vehicle siren. I think the hi-lo signal was used specifically for nuclear attack.

[mhmcdonal]

Very nice high-low signal + alert. Too bad the dampers shut as soon as the siren is cycled off.

Sounds like a healthy dual-tone British horizontal siren to me... The dampers don't seem to be stuck open/closed. If there was a stuck damper, it would not have been able to do a perfect high-low signal. I think if the camera person used a different method of sound recording the results would be clearer.

[Archon]

They pulsed sirens for a Gray Alert

[Robert Gift]

They pulsed sirens for a Grey Alert

What's a gray alert?

[Archon]

If I remember right it was for Radio active fall out

[Archon]

to me it sounds like both solenoids are working fine