Firecom 8500 (WTC7) Fire Alarm Tone: The Bogen TG-4

The tone / sound generation from the firecom 8500, revealed! 00:00 - The infamous Firecom Tone Sequence 01:02 - The Bogens 02:30 - Individual Tone Selection 03:40 - Relay Demo 04:10 - Continuous Mode 05:12 - What we know 06:00 - Other tone generation methods 07:30 - Tone Switching via Relay Demo 08:25 - Future Plans 09:57 - Patent Research Group Effort! 10:47 - Conclusions