The Siren Board

I thought STH/STL standed for Single Toned High/Low, and the 10
standed for 10 H.P.

there was a 15hp stl-10? how much faster does it wind up?

Whelen Rules wrote:Here is an STL-10 http://www.airraidsirens.com/mp3/airraid101.mp3

These are my favorite federal sirens ever made.

I believe that this recording is actually an ATI in San Francisco, which are programmed to sound a recording made from one of their old STL-10s. The real STL-10 sounds exactly like this from a distance. I was in San Francisco yesterday. It was sad to see all the STL-10's gone and replaced by ATI speakers, which apparently cannot be heard from many places. The Ferry Building, which once hosted the world-famous Heath Siren, now has eight ATI speakers. Two point north, two point south, four point west, and none point east (sorry, Oakland!).

ATI's are no good, why have something that wont do it's job? most people can't hear them due to the sound being "fake" and not pure like a chopped air stream!(which travels a lot beter than speakers)

I found the recording of a STH-10, and i like that more than the STL-10 posted bofore. The STL in that recording sounds like a frog like someone said!

I can remember the STL-10 that was located in a nearby city. This siren had a beautiful sound to it, but was scrapped when it was retired by a Whelen omni directional unit. The local police station had the pull-lever (PB) box, which ran a semi-coded fire signal of three 20 second blasts. However, the downtime between the first and second blasts was only three seconds. While the PLB worked just fine on the Model 5, the STL-10 would barely start downwards, when it went back up again. You had to really listen to tell if it had been set-off for fire or tornado.

On U.S. Highway 12, on the south shore of Wamplers Lake, which is located in northwest Lenawee County, there is a 1978 vintage STL-10A that runs off 440 voltage. This siren is the best STL-10 I ever heard. The motor pickup and wind-down is just like an STH-10 that is very, very fast. I always enjoyed hearing that siren along with the two nearby STH-10s running for a three minute fire cycle. Likewise, this siren was even more effective at night, when the wind was blowing to the north. Many people have claimed they heard this siren up to seven miles away in the wee hours of the morning.

When I lived in Omaha, the STL-10 in Irvington would sound three minutes of attack for fire calls, and I would hear it three miles away inside my house. It had a rather spooky, echoing sound, but much nicer than the 2001 that I couldn't hear only 1 1/2 miles away.

How much do the STL's weigh? The STH's must be very similar in weight, but a little more for the three more projectors.

I think the STL10 has 7 horns.

Yes, it weighs about like an STH10.

I have a 1950's STL with a GE motor IT weights about 600lbs The motor by itself weights 200lbs it's a beast to move around in the garge.