My DIY ACA hurricane 130

[Model L]

The WPS-4003/4 has an identical horn/driver assembly to the vortex. the 4003/4s rotor has an array of 5 limit switches that engage with corresponding cams on the main shaft of the rotator. it uses these to encode its position and they allow it to be positioned in 8 different locations, though most of the time you will see 4 being used (north south east west). the Vortex's rotor lacks these position switches, instead having only 2 for sensing when the rotor has hit either end of its full rotation and must reverse. the vortex rotor has a different gearbox setup compared to the 4004 as well, causing the rotator box to be more of an elongated rectangle rather than a cube. this is partially due to the position encoding mechanism of the 4004 taking up a lot of vertical space, whereas of course the vortex lacks this.

also, the vortex series uses a stripped down control box which is designed to support a max of 4 400w drivers, the cause of the omnialert series only going up to 4 cells. these controllers of course are not capable of prerecorded or live transmitted voice, and have tone-only amps. these controllers are otherwise functionally identical to whelen's other sirens, having the full tone set, Si-Test, etc.