I was excited to see the La Crescent, MN Sentry 10V siren for the monthly test. The last time this siren was recorded was in 2012. I wanted to get over to La Crescent and record this, as it was the first Sentry 10V that I have ever heard in person and recorded. The tones came in, and the siren did not activate. The other 2001 went off. You can hear in the video a hum going on and off because this siren does the ATTACK signal. So something with the chopper could be jammed. I think that this Sentry replaced and ACA Hurricane. It looks like it has the same metal plate that the Hurricane's blower would go on. It looks like that they did not take everything off the pole.
https://www.youtube.com/watch?v=c3t3E8996qg