When a tall building is being built, a construction elevator intercom system is often needed so workers on individual floors can call the car operator to request a ride on the construction elevator. The environment these intercoms have to operate in is often harsh and power is not always available. A wired intercom system is usually not an option due to the complexities of running the cable. So the desire is for a wireless system, but with all the concrete and steel in the building, not just any wireless system will work.
A wireless call box is the device that our clients implement for construction elevators. The call box can communicate with other call boxes, base station intercoms, or hand-held two way radios. These callboxes are placed on the individual floors and usually the lift operator has either a base station wireless intercom or a handheld radio depending on whether AC power is available in the car. Alternatively, another callbox can be used in the elevator, but it will need to be AC powered since it must remain on all the time so the floors can contact the lift operator. The callboxes on the floors can be battery powered since they can turn off after each use.
These callboxes are built for outdoor use so they are tough enough to survive in a construction environment. They are available in both UHF or VHF frequencies so they can be used with existing business band radios. The VHF model also has five unlicensed frequencies named MURS, which is short for Multi-Use Radio System. MURS does not require an FCC license to operate.
There are also heavy duty wireless base station and hand-held devices that are available in both UHF, VHF, and MURS. All these devices are available at www.IntercomsOnline.com.