No, the siren I saw looked just like the Federal 550AT located out in Colorado Springs. However, from what I remember from talking with the local Federal Signal siren tech in the early 1980s, he said "the 550AT was an SD-10 laying on its side, but did rotate. However, it did receive a design upgrade that resulted in a more narrow beam width for more direct sound propagation, just like later Model 500ATs."Adam Pollak wrote:
Ron, is this the type of siren that you believe you saw back in St. Louis County? While it is dual-headed and does resemble an overall 500T/550T, it looks different than the pictures of the sirens I've seen from the Colorado Springs area. One side looks a lot smaller than the 500Ts I have seen in person before.
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