i have pondered this question for a while, what happens when a whelen or any kind of FS siren is activated i know it uses dtmf but how does that signal activates a warning tone

I remember Derek Thompson had a video up of a 2001-DC that he had and he took off the back plate exposing the chopper. Smaller than I had previously thought. On a side note, here is a link to the 2001 siren patent. http://www.google.com/patents/about?id=riM5AAAAEBAJ&dq=Outdoor+siren i did see t...

i am finishing up my model 2001 siren and needed to build the chopper to complete it i have heard several rumors about the FS 2001 chopper/stator assembly being similar to a model 3 and STH-10 but more so i wanted to know the real design of the stator i have looked on federal's website and couldn't ...

i know that this is kind of late but i wanted to get more exposure and spread the news on the topic in this video
the video reguards to the ever so amazing city of Dallas,Tx installing a new siren system of 2001's(like grapevine).http://www.youtube.com/watch?v=gG03GifQ2Fc

I am going to slightly hijack this thread to offer some related information. Immediately south of Norman is the little town of Goldsby. They have had a P-15 near the center of town for a long time. March 31st of 2008, I was driving to Dallas and I saw this newly refurbished Thunderbolt standing gua...

here are pics of when i went out to check the progress of grapevine installing their new warning system video on my YT profile http://www.youtube.com/watch?v=vpv0gXd_2hY here are a few pics not included in the video this one replacing the dove park Thunderbeam http://i840.photobucket.com/albums/zz32...

Can anyone tell me who removes the sirens when a city installs a new warning system i would gladly appreciate it!