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DJ2226
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Re: Post your Mystery Sirens here.

Sat Jul 22, 2017 3:39 am

That's a single phase Model 5. They are pretty rare considering most single phase Model 5s and 3s are 12 port.
Proud owner of a Model 1.
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Arteelx
 
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Re: Post your Mystery Sirens here.

Sat Jul 22, 2017 4:11 am

No, it's single tone, so either a 3V8(H), 7V8(B) or 10V.
You guys have been very helpful! I'm starting to wonder if this really is a single-tone siren, or not. I went to Sentry's webpage, and I learned that their two-tone sirens have tones at 460 & 920 Hz. This means that the high tone is exactly 2X the low tone. (This is news to me because I always thought that dual-toned sirens created a chord, rather than two octaves of the same note.) If you look at my original posting, the spectrograph clearly shows a second tone that is 2X the lower tone during the spool-down. I assumed that this was simply a harmonic of a singe-tone siren since it's very hard to produce a pure sine wave...but now I'm wondering if perhaps that is the second note from a two-toned Sentry unit. Also, I definitely measured the low tone at 471.7 Hz, rather than Sentry's published value of 460 Hz. This is a difference of about 2.5%. Is it typical for an electromechanical siren to be off from design by this much?
2T22 or not 2T22...THAT is the question.

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Re: Post your Mystery Sirens here.

Sat Jul 22, 2017 5:02 pm

I went to Sentry's website, and I downloaded their sample sound files for the 10V and the 10V2T. Lo and behold, the low frequencies in both cases are around 469-472 Hz, rather than the published value of 460 Hz. This matches perfectly to what I'm hearing at my house. Also, the 10V and the 10VT2 look nearly identical in the analysis. In both cases, a high tone shows up at a frequency of exactly 2X the low tone...in one case, it's due to harmonics...in the other case, it's due to the existence of a second siren. So I think you guys hit the nail on the head. This is definitely a Sentry siren, and it could be either a single-tone or dual-tone model.
Attachments
Sentry_Samples_10V.jpg
Sentry_Samples_10V.jpg (119.62 KiB) Viewed 5453 times
Sentry_Samples_10V2T.jpg
Sentry_Samples_10V2T.jpg (124.62 KiB) Viewed 5453 times
2T22 or not 2T22...THAT is the question.

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justie1220
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Re: Post your Mystery Sirens here.

Sat Jul 22, 2017 8:13 pm

wow never thought analyzing the hertz frequencies could help us to determine what a siren is!
According to my signature ive been 16 years old for the past two years.Apparently i have found the Fountain of Youth :lol:

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Re: Post your Mystery Sirens here.

Tue Jul 25, 2017 7:59 pm

I found this in Stillmore, Georgia. I'm thinking it's an ACA Screamer?

https://goo.gl/maps/SfT6NHpj86B2
24, and not dead yet.
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Luke
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Re: Post your Mystery Sirens here.

Tue Jul 25, 2017 8:02 pm

That seems like the most logical option.
Welcome to Pennsylvania, where test days are few and far between. However, where there is one, you can find the recordings here! https://www.youtube.com/channel/UCTiIF1 ... q5mZXtMDnw

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Luke
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Re: Post your Mystery Sirens here.

Mon Jul 31, 2017 12:59 am

https://goo.gl/tgJ2rN

Looks like a Fedelcode 2 to me, but it sounds like a 5 (based on the times iv'e heard it sounding for fire calls). Any ideas?
Welcome to Pennsylvania, where test days are few and far between. However, where there is one, you can find the recordings here! https://www.youtube.com/channel/UCTiIF1 ... q5mZXtMDnw

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MaumeeStormMaster
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Re: Post your Mystery Sirens here.

Mon Jul 31, 2017 3:19 am

That's actually a Model 5. The top lid of the housing is actually not fully down on the siren, that's why the top louver is higher up. It might not even be fedelcode, it looks more like a Federal Signal. Still a cool find.
Forbidden State of o h i o.

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1978 Federal Signal 3T22A
Federal Electric Model A
Faraday Model 155 (Rebranded Sentry F2)
Federal Signal Selectone Model 300
Mixed Fire Alarms and Cheap Chineese Siren
Temporarily in Posession of Federal Signal Model L

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Synther
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Re: Post your Mystery Sirens here.

Mon Jul 31, 2017 3:36 am

Luke wrote:
Mon Jul 31, 2017 12:59 am
https://goo.gl/tgJ2rN

Looks like a Fedelcode 2 to me, but it sounds like a 5 (based on the times iv'e heard it sounding for fire calls). Any ideas?
Federal Signal Model 3 with the bottom shroud lowered. It's too small to be a Model 5, and it looks nothing like a Model 2. Nice find.
State of Utah siren map - My channel
STH-10, SD-10, 2 Model 2s

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Luke
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Re: Post your Mystery Sirens here.

Mon Jul 31, 2017 11:18 am

Thanks for your help!
Welcome to Pennsylvania, where test days are few and far between. However, where there is one, you can find the recordings here! https://www.youtube.com/channel/UCTiIF1 ... q5mZXtMDnw

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