The Siren Board

I don't know if this can be done or not, but is it possible to have two sirens on one pole, like a giant pitchfork? I think you've seen streetlamps where they have two lamps on the same pole but can they apply that design to sirens, or would that be unstable?

Hi!

Of course it is possible; the construction must be strong enough and you have to take care that the horns don't collide while the sirens run. But it would be easier to use two poles.

Like this?

Leave it to Daniel to have a photo!

Would be fun to hear all the resultants created by those two sirens so close to each other.

But seems like a waste.
They should spread them out.

Two sirens together are no louder than the loudest one.

My guess is that one is for Tornadoes (being in Wisconsin and all) and the other is for Fires/other.

The one to the right is a Decot dual-toned model which sounds on a major fifth near A major.
Having heard both on separate soundfiles offered during the 2004 Siren Contest (I can e-mail you both if you wish), I can say that the T-Bolt shown sounds on the lower portion of the aforementioned chord, or something like a C-sharp.
Therefore (or at least IMO), the resultant chord shouldn't be any different than if the Decot were to sound alone.

PhRed wrote:The one to the right is a Decot dual-toned model which sounds on a major fifth near A major.
Having heard both on separate soundfiles offered during the 2004 Siren Contest (I can e-mail you both if you wish), I can say that the T-Bolt shown sounds on the lower portion of the aforementioned chord, or something like a C-sharp.
Therefore (or at least IMO), the resultant chord shouldn't be any different than if the Decot were to sound alone.

Not to be nit-picky, but that particular Decot is actually a 10/16 model and sounds a 6th interval. There is a sound file on Marcoz' site and it is quite melodic.

There was another photo from Indiana, I believe, which showed two Model 2's side-by-side on a pole and painted red, white, and blue.

Since they cannot rise and descend in the same relation to one another, they no doubt create all kinds of interesting resultants.

When I was driving an ambulace with the Unitrol 800 siren in Wail, when I hit the Q siren and it rose with the Wail rise, it created all kinds of effects.
Where the Q was rising as the Wail was descending, or vice-versa, at some points it felt as though our ears were "cracking" -though the volume in the passenger compartment was never loud at all.
Wish I could have recorded the effect.

I have wondered what would happen if two sirens in a "pitchfork" arrangement were slowly alternated back and forth, perhaps switching back and forth every four seconds or so. If both sirens were of a similar size but different port ratios, such as 10-port and 12-port Model 5's, it could produce a very distinct warning signal. Here is a short simulation taken from my old GCS Model 2 alternating with a pitch-modulated recording of the same. The timing isn't perfect, but it makes an obnoxious warning.

http://media.putfile.com/Alternating-siren-setup

Daniel wrote:
Not to be nit-picky, but that particular Decot is actually a 10/16 model and sounds a 6th interval. There is a sound file on Marcoz' site and it is quite melodic.

Thanks for the correction. I was never a music buff.