Rare Siren! Federal Signal ""ST-12"" - Alert- Monmouth, IL 

Probably just a prototype SD-10. You have to realize, it’s in Illinois and Federal probably tested prototype models mostly within the state.

Love that wind up!

That sounds amazing! The tone is so smooth it almost sounds like it’s an ASC e-class

That's one of a kind my friend, lots of rare sirens seem to be popping up recently!

670 Hz! Sounds like a mechanical ASC E-Class/iForce.

I don't know what it is but I love how it sounds.

That’s pretty unique. Great video

It even has the fast wind down just like the SD-10 has. Great video and nice catch!

That's one rare siren! I've never seen this kind before, but Man that thing's amazing, I think they took an HOR 12 Port Rotor and stator and probably motor.... Unsure about the motor part.... But that having the SD-10 parts makes me think it's an early prototype single tone ST-10 or maybe something similar to that. Anyway, awesome video! That siren is one of a kind my friend. It really is.

My friend moved to this town 2 months ago. When I sent this to her, she happily told me she lived near it and will take me to go see it when I spend the night in a few weeks!

Wow that’s neat! Seems like this is some sort of a single tone SD-10 model that was never made in mass! ALSO - on Streetview, you can see the bottom cone of the shroud about to fall off below the stator.

Nice find. Twice in one day I discovered new sirens on RU-vid.

Woah. Awesome video!

Thats awesome! It looks like they took the stator from a model 7, shoved a STH-10 rotor into it then slapped on parts from a SD-10… idk if I should consider this a abomination or not lol

Update I spoke to FedSig and they're completely stumped on what this is Going to be going back when weather is a bit nicer and seeing about roof access or getting the drone up for more pics and will make an updated post in Siren Enthusiasts FB

Wow! An amazing video!

I imagine this is a SD-10 that’s single tone

Incredible sound 😧

I'm aware you mentioned that you made the designation up and it isn't official, but I would've called it the SS-10, since SD-10 actually means Special Dual-Tone 10HP. So, it would logically make sense to call this thing the SS-10 since you'd be changing the Dual-Tone part of the siren to Single-Tone. But as much as I want to believe this thing is official, some of the parts on this siren do not look Federal made, which leads me to believe that this is a mishmash of different siren parts.

It sounds strikingly similar to a 2001

incredible

I noticed this siren August 2021 during a car show, but I thought it was just an old deactivated one, I was wrong. Very nice footage Also, the new boston il sd10 looks kinda like this, too. Update: I'm 99% sure this and new boston's sd10 are both prototypes

I’m guessing this is an STH-10 that someone had quite a bit of fun customizing.

A RSH-10 with the deflector disc and squirrel cage removed

I guess it’s safe to call it a mystery siren for now. I can hear 2 other sirens in the background

The sound of the siren is very similar to that of federal signal sht-10

Such a beautiful perfect "F" note.

Sounds good

what if the town got an SD-10 and asked for it to be single tone

what building is this on

Wouldn't it be ST-10 because im sure even if this is a prototype, it would still have a 10HP motor, right?

To me, this looks like a 12-port HOR rotor/stator, with the intake and motor cover from an SD-10. Looking on Streetview, it had the bottom half of an SD-10 as well but it fell off. Seems like they just slapped SD-10 parts on a HOR and called it a day, but haven't maintained it very well.

I just saw this today so I went back on street view to take a look at this thing and it has the bottom of an SD-10 dangling off of it.

It's probably a 10HP electromechanical "collage" siren made from parts produced by the Federal Sign & Signal Corporation. Original siren could likely be a Model 5A/5B, that eventually was parted out. And also what a disappointment, I was expecting a 3 port undertone just like as in the original dual tone version. Anyways, here's my backstory on this siren: As both the SD-10 and Model 5T have parts commonality either an SD-10 or Model 5T was installed at some point at this exact location. Eventually a single tone Model 5 unit in the county was in the process of being parted out and everything had been stripped away with the exception of the rotor and stator. The model 5's chopper assembly was eventually used on an SD-10, which already had half of its's shroud cannibalized to repair an identical unit outside of town. This SD-10 being either the original SD-10 installed at the location or another county unit that was eventually relocated to this spot at some point. it could be a realistic explanation as i see parts of civil defense yellow and rusty metal.

Looks like an Model 5 with a SD-10 motor cover, Sounds like an STH, probably just a prototype SD-10 though.

Almost sounds like a higher pitched HOR siro Drone

Hi I wanna ask you when this tests When we go there next week when does it test

whoa… whats the exact location?

Custom STH 10 or SD 10?

why do i hear a tone thats a third under the particular siren tone?

The wind up sounds like an sth-10

Sounds exactly like an STH-10

Never seen this one before

It would be cool if someone could see the tags on this monstrosity

It looks like half of an SD 10 with sth 10 tone

Is it possibly a HOR?

That is a strange siren

its looks like SD 10 but 1 ported

It sounds like an mechanical asc e class / asc iforce but it’s mixed up with an Sd 10

Sounds like electronic asc siren or Sth 10

Looks like they customized this by taking off the bottom of an sd-10 adding a fedelcode model 5 stator and taking off the part not making the sd-10 stator visible. This couldn't be an official siren without customization wouldn't be surprised if this was an unavailable product made by federal signal that no longer was made probably after 1969

sounds like a fedelcode model 7

Made a homemade siren with the exact name! It's not loud and mounted on windowsill Update: needs new motor Another update: completely demolished

Whatever the fuck this thing is, it didn't start life as a Federal.

Its like a single tone sd10

Theres one of these in new boston illinois

Oh, its a SD-10 with bottom housing removed and a port removed

Sounds like a STH-10

Well, THIS is a first!

thats a very beat up prototype SD 10

That is one weird fuckin thing...

It Sounds like a model 5

Looks kinda like a half of a sd10

STH-10

11 ports turbine Sounds

Yup that's my tornado siren I'm from here it sounds creepier further away trust me😂

WHAT THE HELL I HAVE TO SEE THIS

What

That's an ACA rotor

>8D

I don’t get how this siren looks weird and goofy but it looks kinda funny to me though I mean it’s okay but why does everyone hate this siren?

It sounds like a a sth10

probably made out of scraps and turned out weird as fuck

its obviously an sth10 rotor

Model5 dual head nosonville il

Why the premiere

Goofy lookin ahh siren

Wtf

It sounds like a STH-10