The Siren Board

Video of Sentry 10V2T 3 minute Alert By JGMolter
http://www.youtube.com/watch?v=L6S-1FNQmLM

Joe, is this the one by the library??

Sentries are the only electro-mechanical sirens that I've ever heard that sound in a full octave interval. I'm guessing that the port ratio for that siren is 8/16. I loved the long wind-down!

What is the decibel rating on these?

ver tum wrote:Sentries are the only electro-mechanical sirens that I've ever heard that sound in a full octave interval. I'm guessing that the port ratio for that siren is 8/16. I loved the long wind-down!

That octave ratio is unique to Sentry and Sterling, which has had them since at least the late 1930's.

red04stanggt wrote:What is the decibel rating on these?

Today's current 10V2T is rated at 120dB at 100'. I say "today's" because they changed the output rating of some of their sirens recently, such as the 40V2T going from 128dB to 130dB. So this 10V2T may be a few dB quieter than todays offering.

At about 3:55 it starts winding down faster. Why is that?

RamFett wrote:At about 3:55 it starts winding down faster. Why is that?

Capacitor switch plate reclosing.

I think the higher tone is a bit too high to be effective. It is only a semi-tone lower than the ATI's dreadful pitch. Nevertheless the wind-up and wind-down sounds nice.

JasonC wrote:

RamFett wrote:At about 3:55 it starts winding down faster. Why is that?

Capacitor switch plate reclosing.

Ah. Thank you, sir.