How would a UK siren sound for Tornado Warnings?

[SoundOff]

Since the UK carter siren sound is the most often used air raid siren sound effect in many "war" movies; I'm sure most people that hear one activating for a tornado warning will definately know that it's a warning siren. It may wind up faster on 60 hz power but a variable frequency 3 phase driver could be used to slow that down.

I wonder what the 2T22 will do in the UK; I'm sure they will hear it but wonder what the sound is since it may sound a little different. Setting it off in "attack" signal, however, may make it sound more distinct and also help people know that it's a warning siren.

But in any way, it will sound very frightning especially when the warning is given out at night and one is listening to it from a distance.

[Robert Gift]

I can't tell the difference between a 2t22 and a Carter.
To me they sound the same.
Why would they would not sound the same?
Each has a rotor inside a stator on each side of a motor.
What could be the difference?
Can someone post the two together so we can make an A-B comparison?
Thank you,

[SirenMadness]

Though the 2T22 and some British air-raid sirens have the same tonal ratios between their choppers, the 2T22 produces a higher overall pitch, because of its higher demands for current and its higher Hertz ratings. A 2T22 also has different acoustic qualities.

[Daniel]

One difference is that the 2T22 has projector horns which alter the quality of the tone. In American installations, sirens tend to be mounted higher above ground level, which allows for a more direct line of sight and therefore a direct path for the sound waves to the hearer. British installations are usually lower and depend upon refraction from structures to diffract the sound waves, which can dampen certain frequencies and add reverberation. Also, the ratio of the weight and air resistance of the rotor versus the size of the motor is different in these sirens, resulting in a faster windup for the 2T22.

[danwisbey85]

I can't tell the difference between a 2t22 and a Carter.
To me they sound the same.
Why would they would not sound the same?
Each has a rotor inside a stator on each side of a motor.
What could be the difference?
Can someone post the two together so we can make an A-B comparison?
Thank you,

This is I believe a 2T22 sounding the attack:
http://www.youtube.com/watch?v=vSelf6SSRhE

Here is a UK siren:
http://www.youtube.com/watch?v=8wIJ1D96ArI

Dan.

P.S, if you lower the pitch on a 2T22 mp3 recording, it sounds very similar to a Carters siren, just faster wind-up!

[Justin]

Yeah, I noticed the longer duty cycle on the Carters.

I prefer the 'Get down! Nuclear attack imminent' tone of the Carter, but the 2T22 duty cycle.

Just out of curiosity, what sort of timer was the Carter run off? Not the CD one's the US has?

[danwisbey85]

All I know is, that the timed signals of the UK Sirens, were 4 seconds on and 4 seconds off for the Air Raid Signal, and 60 seconds for the All Clear.
Another was the Flood Warning, which is 30 seconds on 15 seconds off.

Dan.

[Archon]

A T-135/C-125 Would sound like thishttp://zenixstudios.com/download.php?f= ... 0hz59f.wav
This is taking into account 50hz electricty and motor slippege.

[Robert Gift]

This is I believe a 2T22 sounding the attack:
http://www.youtube.com/watch?v=vSelf6SSRhE
Here is a UK siren:
http://www.youtube.com/watch?v=8wIJ1D96ArI
Dan.
P.S, if you lower the pitch on a 2T22 mp3 recording, it sounds very similar to a Carters siren, just faster wind-up!

Thank you, Dan.
You guys are amazing.
I'd never notice the subtle difference unless you pointed it out.
If we remove the 2t22's cones and cap and place it horizontally, do we not essentially have a Carters siren? (Except for the intake tube before the rotor (compressor) intakes on the 2t22.)
I especially like that the Carters siren rotors are so visible.

[Daniel]

One difference is that the 2T22 has more elongated, rectangular ports while the old Carters were squarer. We haven't yet determined how the shape of the port affects the sound, but I'm sure there would be a difference if you put them side by side.