The Siren Board

Discussion of Outdoor Warning Systems
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PostPosted: Sat Sep 22, 2018 2:28 am 
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when they say third signal, they could just mean a fast wail signal. I do not see a damper fitting anywhere on there without hampering sound output.

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PostPosted: Sat Sep 22, 2018 2:38 am 
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Id imagine you can put the damper directly onto the stator.
jacob585 wrote: *
I do not see a damper fitting anywhere on there without hampering sound output.
Isnt that the point?

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PostPosted: Sat Sep 22, 2018 2:40 am 
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Synther wrote: *
Id imagine you can put the damper directly onto the stator.
jacob585 wrote: *
I do not see a damper fitting anywhere on there without hampering sound output.
Isnt that the point?
No what I meant is that I cannot see a damper fitting answer without hampering sound output when the sirens doing normal signals.

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Your siren nut from southwestern Missouri.And good at identifying sirens.what my town has two 2001-SRNBs one thunderbolt 1000A
and one 2001-130 and a rare siren hunter gridface thunderbolts RE-1600s Chryslers Etc. Im also now on Discord!


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PostPosted: Sun Sep 23, 2018 3:40 pm 
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An open damper wouldn't affect sound output regardless of where it was positioned

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PostPosted: Fri Sep 28, 2018 11:28 pm 
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I read somewhere that the motor itself freezes up to create the pulse signal. Is this true?

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PostPosted: Sat Sep 29, 2018 8:30 pm 
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Depends if they made one durable enough for it. Plus it wouldn't be a pulse signal and if the rotor went from ~3000RPM to 0 in a short time the torque involved would probably shake the thing apart given time and signal duration.

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PostPosted: Mon Oct 01, 2018 2:33 pm 
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There once existed a recording of either an Allertor or Banshee doing this "yelp" signal. From what I understand this was accomplished by changing the polarity of the motor leads to electrically "brake" the motor. I don't know how many units were ordered with that capability, but it would seem this would damage the motor over time.

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PostPosted: Mon Oct 01, 2018 6:37 pm 
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That's how I thought the motor would've been braked. Some of the local fire departments near me had Cyclones with this feature.

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PostPosted: Mon Oct 01, 2018 7:19 pm 
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MaineCivilDefense wrote: *
That's how I thought the motor would've been braked. Some of the local fire departments near me had Cyclones with this feature.
Cyclones had a damper for third signal. This is unless those ACA promotional VHSs aren't giving the full picture.

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PostPosted: Tue Oct 02, 2018 10:00 am 
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Travis wrote: *
There once existed a recording of either an Allertor or Banshee doing this "yelp" signal. From what I understand this was accomplished by changing the polarity of the motor leads to electrically "brake" the motor. I don't know how many units were ordered with that capability, but it would seem this would damage the motor over time.
IIRC Doerr made special motors intended for this yelping signal, that polarity revarsal thing was dropped when ACA started using Baldor motors

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