Pictures of San Francisco's sirens and a half-test video

[Daniel]

That does appear to be a Thunderbolt behind the ATIs. It makes sense, because those four speakers point up Market Street into the Financial District. It looks like it isn't meant to rotate. On the upper ledge of this same tower once sat the famous Heath Siren.

The three openings below the siren are part of a very loud electronic clock bell system that I suspect is louder than the ATI speakers.

[Justin]

Is that a Thunderbolt behind those ATIs in the first picture?

Boy you gotta sharp eye, I would have never noticed that.

And a good eye for detail. I didn't pick that up initially either. Don't 'spose you had a career in forensics in mind?

Gotta love Google Images as well:
Image 1
Image 2
Image 3
Image 4
Image 5 (extremely large)

Now that I think about it, when I was over there on exchange, we weren't too far from that building. That's possibly two distant encounters with a Thunderbolt. I would kill to be up close to one. It's not fair damnit! You guys get all the fun.

[siren fan]

Why are some ATI's stacked doubles on poles and some only singles?

[kswx29]

It appears they are using some of the old siren's mounting poles for the ATIs. In this video you can see that the ATI is on what looks to be an old STL-10/STH-10 mount. Does anyone know if SF tested their old system Tuesdays at noon as well?

http://www.youtube.com/watch?v=soY0y8TzVI0

[holler]

Why are some ATI's stacked doubles on poles and some only singles?

Because the more speakers, the more volume. Pretty much the same reason you some Modulators and Whelens with two cells and others with six.

[carexpertandy]

Is that a Thunderbolt behind those ATIs in the first picture?

Boy you gotta sharp eye, I would have never noticed that.

And a good eye for detail. I didn't pick that up initially either. Don't 'spose you had a career in forensics in mind? :P

Gotta love Google Images as well:
Image 1
Image 2
Image 3
Image 4
Image 5 (extremely large)

Now that I think about it, when I was over there on exchange, we weren't too far from that building. That's possibly two distant encounters with a Thunderbolt. I would kill to be up close to one. It's not fair damnit! You guys get all the fun. :D :wink:

The first photo here must be before the ATIs were installed.

[Travis]

I know that it's just a recording of the old STL-10s, but the ATI's actually don't sound that bad. I wonder what an actual real activation would sound like. Maybe they just loop the STL recording?

[EL1998P71]

Is that a Thunderbolt behind those ATIs in the first picture?

Boy you gotta sharp eye, I would have never noticed that. Must have the rotator disabled.

I don't see how they could get it down without removing the ATI, even though I would like to push it down onto the street.

It doesn't look like there's enough room for it to rotate, unless there is one on the other side?

[Daniel]

It doesn't look like there's enough room for it to rotate, unless there is one on the other side?

There's nothing on the other side of the tower but San Francisco Bay. You can see the horn protruding from a hole in the wall.

Before the fateful arrival of ATI, San Francisco had a mix of sirens. Most of them were STL-10's (including the corner of the roof of that fire station shown above), but there were also Model 5's, STH-10's, and perhaps some older electronic ones.

[carexpertandy]

It doesn't look like there's enough room for it to rotate, unless there is one on the other side?

There's nothing on the other side of the tower but San Francisco Bay. You can see the horn protruding from a hole in the wall.

Before the fateful arrival of ATI, San Francisco had a mix of sirens. Most of them were STL-10's (including the corner of the roof of that fire station shown above), but there were also Model 5's, STH-10's, and perhaps some older electronic ones.

Yeah, there's that Model 5 in Fort Mason. Does anyone know if this was the only thunderbolt in the old system, or were there a few others?