You would want a minimum 20HP VFD drive or phase convertor. Ronk makes a phase convertor for sirens:
https://ronkelectrical.com/products/add ... er-type-hd

I can get some dimensions from the horns off my STH-10 tomorrow.

Here is another picture I have, this is likely what the larger models listed looked like.

It's an HOR siren, the motor cover is a dead giveaway. Probably a Type D or #2 as listed in the document.

Looks like an antenna. Thats a model that was made by Digitex in the late 80s. Works on the same principles as the Modulator. Its quite common in Silesia region. Where did you get this from? Obviously an antenna. You are most certainly incorrect... Here is a whole forum post filled with pictures of...

It's been done numerous times. There's an STH-10 mounted upside down, a pair of first gen Federal Type Mach. Bs, a Sireno vertical, and a few others come to mind. That STH-10 is/was at Smith & Edwards in Ogden, UT, which is a sports/fishing warehouse. Not a permanent installation, unfortunately.

As far as I know, we don't have a lot of documentation that provides more than broad dates for these older Federals, but I can say it predates 1955. My best suggestion is to look for documents from the town, or newspaper articles, referencing it's installation. Can you closer pictures of the siren, ...

Please leave moderation to the moderators... Post bumping is allowed as long as you provide a worthwhile contribution. The "bump" was approved, as it is not a long shot to ask if the article was moved, or if anyone has the article archived somewhere. Topic is locked, please PM if you have ...

There are automatic timers with adjustable cycle lengths available online. To keep everything compact, find one rated for the load you are controlling. At 120VAC, I recommend 2A or greater.

Based on the specifications listed online, the Sentry F-2 and Federal Signal Model A are identical in output volume. However, the Sentry F-2 draws 2.5A at 120V, and the Model A draws 1.9A at 120V. Brand new F-2s are available for half the price of a Model A, but both sirens are generally regarded as...

That is very helpful, thank you. Do you have some advice about the amount and exact shape of the vanes? 2800RPM+ means 3000RPM would be good or is more more better? I guess then I we would need a belt drive since most motors are either 1500 or 3000RPM with a 50Hz grid. The siren would be mounted ho...