Dual tone Thunderbolt and possibly an EOWS series siren

[ver tum]

Why does everybody keep referring to these as the 1000T and 1003. You can't tell the difference between a 1003 or 1000T by listening to it running in attack or alert.

I refer to these two sirens as the 1003 and the 1000T, because of the many 1003 and 1000T recordings I've listened to, the Attack signalon the 1003 has always sounded different to me than the 1000T. On the 1000T, the rise part of the whale is shorter than the fall. On the 1003, they're both the same length. At least, that's what I've heard in the siren recordings. I can't tell the difference in Alert, but I can hear it in Attack. I think that if someone played me a recording of a dual tone TBolt in Attack, I could probably correctly guess whether it's a 1003 or a 1000T 9 times out of 10.

It is impossible to tell the difference between a 1000T and a 1003 on the alert or attack signals. Nearly all Thunderbolt's sound different due to the change chopper transformer taps, timer's, time delays, etc. The only mechanical addition to the 1003 is the solenoids. The solenoid's electrically and mechanically have no interference with the siren's operation in alert or attack modes.

Maybe, the timers on all of the 1003's I've heard are set different than the 1000T's I've heard. Thanks for clearing that up.

[kanazo]

00:46-00:49, abrupt change in volume. 'nuff said.