Sentry 7V8 doing attack!

[kswx29]

Very creppy sounding...altho it is not really seen you can sure hear it!
http://www.youtube.com/watch?v=f-WLG2HW8MY
EDIT: Listen to the wind down...sounds like those Screamers that wind down all fast...

[ThunderboltFreak]

Cool video! 8)

[500AT]

I really like the sound of their sirens. However, I don't care for the sudden braking of the motor when its winding down at the end. I am sure there is a way to defeat this function?

[Thunderbolt 612]

But when it was winding down with that abrupt stopping, it sounded like an ACA Screamer in the Sound & Video page of this site! :

[2001srnfan]

It's a shame(not literally) that the camera person didn't stay in the original location. That echo was creepy, and I bet the wind down would have been creepier from on the hill. The sound of the traffic drowns out the siren too, there is also next time though.

[loudmouth]

the breaking is usly so that if fire crews must commuincate they can with out the 3 min wind down in the back round of the raido.

tho that was one nice sounding siren. deffitly just won one of the coolest sound sirens on my list.

[gil64]

Great sound , I believe that is the first Sentry I hear even though I have seen them.

[scooterbugs25]

We have Sentry sirens here, and all 4 of them have that abrupt slow down at the end, when they are thru testing..but when they sound for the any other reason they don't do that..they have a normal slow down. i just thought it was our sirens that did this, thinking there was something wrong with them. I guess not. someone who really cares about it could research it or find out more about it?? I dunno

[JasonC]

The sudden "braking" is due to the fact that the motor is a single phase capacitor start motor, not for testing or communication (I'm not gonna go into electrical talk here, just think of it as a single phase motor with a small capacitor phase converter) . These newer cheaper single phase motors are different than older squirrel cage motors found on older sirens and industrial equipment. Three phase sirens and motors do not have this problem.

[SirenMadness]

That sound is something that you'd hear in the movies. Hearing that sound would be one of the best occasions for me!