Greenfield1003
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Indianapolis Metropolitan Area Sirens

Sat May 06, 2017 2:29 pm

WARNING! LONG POST AHEAD
I know that a topic about Indianapolis (Marion County)'s system was posted a while back, but since that thread is outdated and not all of the info on it is 100% accurate, I figured I'd go ahead and start a new thread, since I do live in Indy and probably know more about their system than a lot of people do.

Let's start with the general testing policy. Indianapolis used to test every Friday at 11:00 for 50 seconds and sound the sirens off for Severe Thunderstorm Warnings with a Tornado Watch on it as well as for Tornado Warnings for 3 minutes, up in till about July of 2011. People started to become "desensitized" to the sirens because they were sounded so often, thus the policy was changed so that now the sirens are sounded ONLY for tornado warnings. The testing policy is as follows: 50 second alert on the first Friday of every month at 11:00 and a weekly growl test on other Fridays. The sirens used to be controlled via WiFi, however the signals kept on getting blocked due to new buildings being put up and whatnot. So come last September Emergency Management has been in the process of switching to RHF to activate their sirens with. The sirens are now activated via 3 FSK outbursts, and even have FSK Parties every 3 hours, starting at 12:00 A.M..
Now let's move on to the actual system itself. (Note that the numbers might be a little off). Indianapolis's old system consisted of 154 total sirens, which included 38 Model 7s/7Ts; 40 Thunderbolt 1000Ts; 7 Thunderbolt 1003s; 64 2001-SRNs; 3 SD-10s (one of which was replaced by a Model 2 or vice versa); a Model 2; and an RSH-10. In 2007, it became clear that the majority of the old sirens had hit their limit. so from 2007-2009 the system was upgraded to a system of 168 Federal Signal 2001 sirens, which includes 54 2001-SRNs (2nd Gen. with the small motor housing and 3rd Gen. with the large motor housing); 4 2001-SRNBs (one of which is not marked on the map but is at Butler University); and 110 2001-130s. Quite a system right there!
Last edited by Greenfield1003 on Thu Apr 12, 2018 4:39 pm, edited 2 times in total.
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Fletch
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Re: Indianapolis Metropolitan Area Sirens

Sat May 06, 2017 4:01 pm

Can you explain what FSK means?

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Darley Champion
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Re: Indianapolis Metropolitan Area Sirens

Sat May 06, 2017 5:10 pm

Fletch wrote:
Sat May 06, 2017 4:01 pm
Can you explain what FSK means?
IIRC, FSK stands for Frequency-Shift Keying, however I'm not sure about that.
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Greenfield1003
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Re: Indianapolis Metropolitan Area Sirens

Sat May 06, 2017 5:26 pm

Darley Champion wrote:
Sat May 06, 2017 5:10 pm
Fletch wrote:
Sat May 06, 2017 4:01 pm
Can you explain what FSK means?
IIRC, FSK stands for Frequency-Shift Keying, however I'm not sure about that.
Yes, you are correct
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Model L
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Re: Indianapolis Metropolitan Area Sirens

Sun May 07, 2017 4:34 am

nice 2001 garden you got there. what happened to the old sirens?
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Greenfield1003
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Re: Indianapolis Metropolitan Area Sirens

Sun May 07, 2017 9:20 pm

Model L wrote:
Sun May 07, 2017 4:34 am
nice 2001 garden you got there. what happened to the old sirens?
Not sure. I know a couple of sirens were auctioned off but I'm pretty sure the rest were scrapped. There are, however, a handful of Model 5s that are still standing but inactive
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Greenfield1003
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Re: Indianapolis Metropolitan Area Sirens

Sun May 07, 2017 9:38 pm

Greenfield1003 wrote:
Sun May 07, 2017 9:20 pm
Model L wrote:
Sun May 07, 2017 4:34 am
nice 2001 garden you got there. what happened to the old sirens?
Not sure. I know a couple of sirens were auctioned off but I'm pretty sure the rest were scrapped. There are, however, a handful of Model 5s that are still standing but inactive
UPDATE: here are the locations of the Model 5s that are still standing

https://www.google.com/maps/@39.6358972 ... 56!6m1!1e1
https://www.google.com/maps/@39.6358972 ... m1!1e1!1e1 (this siren has an interesting history in of itself)
https://www.google.com/maps/@39.8271204 ... 56!6m1!1e1 (siren is behind the building)
https://www.google.com/maps/@39.7664897 ... 56!6m1!1e1 (siren is on top of one of those buildings)
One thing that I noticed is that all of these sirens (minus the one at Oaklandon and Broadway) still appear to be connected to a power source. I'm wondering if I should bring that up to the EMA director since (and I'm not saying this will happen, in fact it probably won't) but if some weirdo were to decide to mess around with the controls then it IS possibly for the siren to be activated (though, to be fair none of those siren have been ran in at least 6 years so the likelyhood of everything working as it should is slim.) Still, it'd be worth looking in to just in case by some bazaar phenomenon every last circuit and motor in the siren has stayed intact all these years.
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Travis
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Re: Indianapolis Metropolitan Area Sirens

Mon May 08, 2017 3:30 pm

That first link you posted might actually be a Model 3. The housing looks a little strange, regardless.
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Greenfield1003
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Re: Indianapolis Metropolitan Area Sirens

Mon May 08, 2017 4:48 pm

Now that you mention it, I recall hearing somewhere that Indy had a couple of HOR SiroDrones as well. It's possible that some of the "Model 5s" (including that one) might actually be SiroDrones.
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Fletch
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Re: Indianapolis Metropolitan Area Sirens

Sun May 14, 2017 9:03 pm

Interesting that they used so many of those Model 5's/SiroDrones for a large metro area. Surprised they didn't have more T-Bolts.

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