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pyramid head
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STH-10/STL-10

January 11th, 2007, 9:40 pm

What is the difference between these two sirens? The only thing i noticed was one of them had more projectors. So more projectors= more ports is what i guess is the alteration.
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Whelen Rules
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January 11th, 2007, 9:50 pm

The STL-10 which is my favorite federal siren of all time, has a lower pitch than the STH-10 STL= Special tone low STH-10= special tone high
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pyramid head
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January 11th, 2007, 10:00 pm

Oh, ok thanks for clearing that up for me! I have noticed that there are sirens in models"a" and "b" which is for motor power(single/three phase) does the three phase power have something special about it? All sirens were made to use it, so it seems. Single phase would be a lot better seems how you wouldn't have to do different wiring, and use just about all other house hold things with it. Does three phase use more energy?
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January 11th, 2007, 10:20 pm

Three phase is more efficient. If you tried running a 10HP motor on 120 volts, you would be pulling a lot of amps. With 3 phase you are lowering the amps by raising the voltage. Like a hose and a power washer. If you wash something with a garden hose, you are in theory going to need more water then if you used a pressure washer. Not the best analogy in the world but the first one that comes to mind. In the building I work in, every piece of major equipment is 480V 3 phase. Pumps, air handling units, exhaust fans, the compressor. Everything except the boilers, which use 120. Even some of our lighting is 277, not much, but some. You have to watch for that, trust me, you dont want to accidentally put a 120V ballast into a 277V fixture.hahaha

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January 12th, 2007, 1:32 am

I believe that both sirens have the same motor and the same rotor diameter. The STH-10 has 12 ports while the STL-10 (sometimes labelled STL-7) has 7 ports, which makes it almost an octave lower. Both sirens run at 3,450 RPM and have a fairly slow rise and fall, but the STL seems slower because it has less of a musical scale to climb.
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pyramid head
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January 12th, 2007, 3:35 pm

I have seen two sirens that look like they are part of the STX-10 series, i will try to figure out which they are when i get my permit and take pics. Also i will be taking some pictures of our local fire department's siren, a blue model 3. 8) Five days remain untill i am 16 :D
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January 21st, 2007, 9:28 pm

Does the STL-10 have a very slow and low sound to it?
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January 21st, 2007, 9:37 pm

Could someone post a recordings of both for a comparison? I've heard a STH-10 before but never a STL-10.

Isn't the Thunderbeam based on the STH-10?

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January 21st, 2007, 10:50 pm

holler wrote:Could someone post a recordings of both for a comparison? I've heard a STH-10 before but never a STL-10.

Isn't the Thunderbeam based on the STH-10?


Here is an STL10 recording: http://www.longislandfirealarm.com/Mill ... -Sig16.wma

Yes the Thunderbeam is the rotational version of the STH10.
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January 21st, 2007, 11:02 pm

Thanks for the recording.

That is one more freaky windup sound. Sounds like a Budweiser frog getting squeezed to death.

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January 22nd, 2007, 12:00 am

The FD in the next town south of my place (Melville) used to have *years* ago an STL-10 as one of their satellite whistles. This one had a slightly faster wind-up and achieved full-cycle for about 10 seconds before easing back down. It was junked when I was maybe 15 (I'm 36); so it must have been a venerable oldie.
Maybe this one was programmed to fast wail or something... :?:

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January 22nd, 2007, 3:37 am

I have a STL from the 1950's The rotor is quite big Mine has a GE motor the 60's STL's had Wagner and the 70's had Marathon 3-Phase Mine is 15HP

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January 22nd, 2007, 5:09 am

Were the motors from the STH-10, interchangeable with the STL-10 and vice-a-versa?

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Ron W.

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January 22nd, 2007, 2:23 pm

I believe the motor interchanges within the STH/STL/SD-10/500 serieses.

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January 22nd, 2007, 6:02 pm

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

These are my favorite federal sirens ever made.
Tyler Lund

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