Denver's George Washington H.S. Thunderbolt fails to rotate.

[Robert Gift]

We timed to be at the 5/6 Thunderbolt at 11 a.m. on the way to the veterinarian.
At 11:03 I heard the compressor start up and run.
Horn was facing south - I was 90 degrees east of the horn.
I ran down the street and got to 55? degrees left of the mouth. Much louder.
Then ran north to 120 degrees from the front and the blower was more noticeable.
The horn rotated on previous occasions.
I shall e-mail the man who maintains Denver's sirens.

[Hacksaw]

Yep, that rotator gearbox is a common problem on the Tbolt's, 500's and early 2001's. It could be just the belt, but I doubt it.

[Adam Pollak]

Here's a pic of that siren different than the one on the siren archive.

[Robert Gift]

Yes! Is that grey box a radio signal receiver?
Better photo than I just took!
Thanks.