THREE MILE ISLAND SIREN RECORDINGS A SUCCESS!

[dboyle]

That's right! You saw it here first!

I successfully got two TMI siren recordings. The first is a video of a P-10 in action. You hear a Cyclone and another P-10 coming in before this kicks on. It starts up when I start talking about the radio controls and the antenna. I say something like, "the antenna is maybe...". Listen to the noise coming off that thing!

http://www.youtube.com/watch?v=tu4lLyU2ot8

Before anyone complains about the jittering and shaking, allow me to say that I didn't have a tripod because I had to basically jump through every hoop to borrow a digital camera that could record videos with sound. Also consider that I was standing across the street from this thing, and being this close and standing there was like being in the front seat of a roller coaster. At some point I said, but I don't know if you can hear in the video, "the sidewalk is actually vibrating!"



And here's an audio recording I took by leaving a digital voice recorder on my roof before I left for the P-10 video. This is my town's Cyclone. Listen to how when it kicks on, it makes a nasty echo. After it winds down, you're complimented with the harmonic sounds of another P-10 and a Cyclone across the river going at it for another minute or two.

http://media.putfile.com/Three-Mile-Isl ... -June-2008

[Mr.Thunderbolt]

Wow! That Cyclone has a really high pitch! How much juice is it getting?

[ver tum]

I didn't realize just how loud P-10's are. What's the DB rating on one of those?

[dboyle]

Wow! That Cyclone has a really high pitch! How much juice is it getting?

They're 3-phase motors, I think the voltage options are 208, 277, and 460 volts. Not very efficient motors, and not suitable for battery backup.

[coyoteunknown]

I didn't realize just how loud P-10's are. What's the DB rating on one of those?

They should be about 126dB at 100', since they're basically an Allertor 125 with a different fiberglass casing.

[dboyle]

That's about the same dB rating as a Cyclone, yet a Cyclone has a 50-hp motor while a P-10 has a 10-hp motor.

EDIT: If you listen closely to the audio recording of the Cyclone, after it shuts down and you can hear the P-10, you can faintly hear bits and pieces of a Federal 2001. The Penetrator in this recording is down the street, less than a mile away, on Limekiln Road. The other Cyclone that is sounding with the P-10 has to be across the river, a few miles away, because there are no other Cyclones near me at all except the main feature of this recording. Further down Limekiln Road a few miles is a new 2001-SRNB. You can only hear it in a few spots, but it's in there.

[ver tum]

I was going to say that the P-10 in that video did sound like it was as loud as a Thunderbolt. The Allertor 125 runs at a slightly lower RPM than the P-10, so that may also contribute to the P-10 being a little louder. Anyone know how loud the single tone version of the P-10 is?

[dboyle]

Isn't a single-toned P-10 a P-15?

[RamFett]

Isn't a single-toned P-10 a P-15?

I used to think the same thing, but supposedly both models were produced in single and dual tone. The difference lies in the horsepower rating for the motor (P-10 being 10Hp, P-15 being 15 Hp.), dual and single tone choppers are the same size, so they should be interchangable. I've never heard a single tone P-10 before, and have only heard one dual tone Penetrator rumored to be a P-15.

[ver tum]

I think that there's at least one video on YouTube of a single tone P-10, and I think it was taken somewhere in WI. My ears tell me that the single tone P-10 has 8 ports, while the duel tone version has 9/12 ports. I think that the same goes for the P-15.