American Signal/ASC: - T-112/121--Grapevine TX - T-128--Flo Mo TX - T-135/P-50--Euless TX, The Colony TX - Banshee (2t)-- Unkown TX - Cyclone 125--Amarillo TX ATI: Dirrectional Spkr Arry--Garland TX Federal Signal: - SD-10--Cedar Hill TX - 2t22--Dalhart TX - 2,3,5,7--Various, Unknown, Indianapolis I...

There was some discussion as to if that siren was some kind of rotating version of the 2T22.

Hmm. Prolly routine testing.

I'm not sure if I am answering this correctly, but the "projector", if you will, actually doubles as the top housing of the siren. Sound is sent out of the chopper and then directed down by the semi-conical shape of the top housing. http://66.113.226.199/asp_pages/Product_Images/sirens%20m...

I made a connection through O'Hare a couple weeks ago and noticed that Chicago (I am assuming NW side) has at least 3 T-135's mounted on water towers/tanks. (The sirens are painted a greenish color, matching the color of the water towers.)

I don't think that local, state, or even the federal government is obligated to pay to place sirens on private property. They have an easement which allows them to do so. They use this mainly for one's utillites like water access, electricity, gas, ect. Legally, the government can do anything they w...

I always thought that the ATI chimes sounded exactly the same as the newer chimes used on Federal the federal electronic sirens.

ASC...Federal products are mucho expensive.