Sorry, that i heaven't posted fur such a long time. But yes,
I've finished my project and the siren is already set up for new years eve:

Of course it will slow down the rotor a bit, but keep in mind, that the air has got less contact surface, since my creation uses only one port of about 1cm?,
while every port of the model D was used in the video!

I'll use a blower from some earlier projects. It's basically a radial blower with
three stage producing a pressure of ~35 psi. The adapter for the blower and
the control unit are the last thing i've planned to to build.

Hi. After a long time of absence I'm back and I'm somewhat proud to present my new project: My own supercharged Siren. Since I started a apprenticeship, I have the opportunity to use lots of different tools and machines for metalworking. Thus I could not stand to tell my boss about my plans of build...

orestis wrote:I'm not sure about the model (L1/F2?), but this is an Elektror siren.

You're right. It's an Elektror L1337, a combination of the L1 and F2.

SirenMadness wrote:...much smaller than an E57.

Sorry, but your're wrong. This is a DS977, which is actually as big as an E57.

Fm wck. = Fermeldewecker = telephone/telegraph bell

In general Siemens used the abbreviation Fm for everything that dealt with telecommunication.

Hi. Could you send me a bigger fotograph of the wiring instructions, plaese? It seems to me that this bell is used to run on 60V (telephone network). Within a week or two i'll get back my book of nearly all alarm equipment of the 30's, and i think it will be possible then, to get some better informa...

It's a DS977, the standard-siren of the former GDR. 8 Ports ~2800rpm.

Greetings from Germany,
Niklas

Looks like a C-40M by ZENTRAKABLPRIBOR Moskau (source).