Fedelcode Model 2, questions

[planeguy2]

so my town has a fedelcode and is usually will do a growl at noon, but when i went out to hear it it did not fire. the next day it did go off but it sounded faint, i also noticed that it went off at 12:03. the next day it went and sounded loud and as strong as it should be, it also went at 12:03. today the same thing happens as day 2.

questions when 3 times it went were at the same time i believe it is on a timer. then why on the first day how come it did not go?

what explains the lack of sound on days 2 and 4? another siren is out of the picture the closest one is the other direction.
has anyone ever heard of sirens having a different strength?

thanks

[archizackture]

The original purpose of the Fedelcode line - as it's a portmanteau of the words Federal, Electric, and Coded - was to have a code damper, which would allow or prevent airflow and therefore sound, to produce pulsed codes such as morse code. Ironically, many Fedelcode-branded sirens are actually not coded, but it's possible this one is. I have no idea why the damper would be closed on only one day, or what kind of control anyone would still have over the damper.

[nvanw27]

Weather conditions and wind can affect your hearing of a siren, but it's possible this one is also dampered somehow.

[JasonC]

It's the weather

[archizackture]

...but when i went out to hear it...

How close were you to it? Same distance each time? What were the weather conditions?

[Chicagosiren-hunters]

Here’s an advert for the aforementioned coded Type 2:

08CB23D2-9B5D-48D4-B51A-7B49640E526D.png (779.9 KiB) Viewed 2555 times

It appears to have a ring-style shutter that covers the individual ports, kinda like those hand crank sirens.

[planeguy2]

i was the same distance

i dont know about a damper on the siren i will have to ask some guys from the fire hall

the weather was rainy all 4 days

[planeguy2]

today it snowed and the siren sounded faint