Well, I found another Whelen in Port Deposit. This appears to be an OA-1 or an OA-2. I will be visiting this location later to confirm the ID.
This adds to the other 2 Whelens we've found, the OA-2 at Conowingo Park, and the 4004 at the Public Works/Municipal building.
Locations:
OA-2: https://www.google.com/maps/@39.6587571 ... 312!8i6656
OA-1 (new location): https://www.google.com/maps/@39.6194188 ... a=!3m1!1e3
4004 (rotator not working/disabled): https://www.google.com/maps/@39.6062241 ... 312!8i6656 This siren did get a new Type 1 fairly recently, I assume with the install of the new sirens in 2014.
And, as a bonus, I found this article online: https://www.cecildaily.com/news/local_n ... 963f4.html
According to this, the system tests the first Tuesday of the month at 9 AM, so we can add that to the MD testing list.