I have recently found some time to spend on my B&M 20-AR-7 air raid siren, Tonight, I counted the ports on each side and came up with 16 on one side and 20 on the other, anyone know if this is the common configuration for a two-tone siren?
Air Raid
16/20? Wow! At 1725 RPM, it would sound sort of like an 8/10 port 3450 RPM siren (ACA hurricane) Can you check to see what the motor RPM is, and if possible, post pictures?
I really want to see a 6-AR-1 now... never heard of an outdoor warning siren that small. Smallest siren I know of was the Fedelcode model 1.
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