The Siren Board

I decided that I'd get a video of the vortex near my house one last time before I get off to school. Anyway, this is from Wednesday's test. The siren didn't "windup" as it usually does. It just started somewhere in mid-Alert. Anyway, sorry about the wind, and I left the camera going at the end so you can hear the other sirens finish up. This siren is closest to the activation point, (central FD) so it is the first on the call list, and consequently starts and stops first.


http://www.youtube.com/watch?v=L9dAl6ufk4E

Nice video. I never knew that the Vortex series could start that deep; that start-off frequency is mind-blowing.

SirenMadness wrote:Nice video. I never knew that the Vortex series could start that deep; that start-off frequency is mind-blowing.

We use "Whoop" for tornadoes, and it really helps get the point accross. The wide frequency range of that signal is quite attention-getting.

That is one of the best videos I have seen in awhile. The echo from the whoop is amazing, almost making the hairs on your back stand up. When the 2805's do the whoop by me, it's not that pronounced. I'm sure the directional concentration and the dBc rating have a lot to do with that. Travis, do you know what the dBc rating of that particular kind of Vortex is? I believe there are a few different kinds that have various dBc ratings.

AWESOME VIDEO!! That was cool. I love the loud echo of the whoop
after each cycle!

Those compression drivers can manage a very broad frequency range when loaded to that very long horn. In terms of their design, the drivers themselves look somethng like a cross between a Community M4 and a Community M200, having the balanced-drive diaphragm shape of the M200 but a more complex phase plug like the M4. The magnet assembly is extremely large, however -- more like that found on high-performance car audio subwoofers. It's a perfect design for achieving the very highest sensitivity when horn-loaded. You can see this in the patent drawings. And it makes the Whelen sirens capable of extremely high output across the entire midband.

I think i heard the 2810 in the background doing voice at the end.

WoW that was impressive. When it was doing the woop and hit the end of its rotaion point and did that woop the echo was amazing.
very good movie !

quiksmith10 wrote:That is one of the best videos I have seen in awhile. The echo from the whoop is amazing, almost making the hairs on your back stand up. When the 2805's do the whoop by me, it's not that pronounced. I'm sure the directional concentration and the dBc rating have a lot to do with that. Travis, do you know what the dBc rating of that particular kind of Vortex is? I believe there are a few different kinds that have various dBc ratings.

We have Vortex R4 s here in Tullahoma and they are rated at 129dBs. They are VERY loud, and I can't understand why some people say they aren't as effective as a mechanical siren because these bad boys can be heard 2-3 miles away!!!
Great video by the way.

Nice video! I think it's interesting how when the siren faced you, the start of the whoop tone was more piercing and it was softer when it faced away from you.