As an construction site project manager you want to make sure workers
can get access to assistance as soon as possible when an emergency
situation occurs. Or if they need to contact you for a question about
the building design or plan, the faster they can talk to you the quicker
the project moves forward.
One way to do that is to place
emergency outdoor wireless intercoms
at strategic areas around a construction site. You have a couple of
different technologies to choose from for these intercoms. One uses
standard two-way radio technology to call two-way radios, and the other
cellular network technology to call your cell phone or landline phone. These intercoms are housed in vandal- and weather-proof housings and
they have a button workers can press to call for assistance.
You can mount these intercoms using low-cost poles you can get at any
building supply store such as The Home Depot, and they can be easily
moved between job sites.
Since the system is temporary you can just mount them to standard eight foot galvanized, 2 3/8 inch fence pole with a
decorative end cap on top. If you don't have power nearby, you can use a
solar power system at the top of the pole.
Since eight foot is a good height that lets you install the antenna
and solar panel up out of the reach of people, you still need a way to
attach the pole to the ground without taking away any of it's length.
You can also purchase a two inch piece of electrical conduit that the
fence pole will easily slide over and then you can bolt the fence pole
to the conduit after you set the conduit in concrete.
Mounting the equipment this way lets you quickly move the it to
another construction site without having to remount the equipment to a new pole.
When the project is done, you dig up the conduit and throw it away and you save the
fence pole and equipment for the next event.
If you have existing licensed two-way radios, you can get models that
will work with those. Otherwise you can use unlicensed MURS radios. One problem with using
licensed two-way radios is that if you are moving
around to different locales, that makes it harder to get a license since
getting a license requires a 'frequency coordinator' who checks for
existing two-way radio users in an area before a frequency can be
assigned to the license. They want to make sure your radios don't
interfere with existing license holders. If you are moving around that's
virtually impossible to do.
The solution to this problem is to use unlicensed MURS business-class
two way radios. There are five frequencies in the 150 MHz radio spectrum
that are called the MURS service. MURS stands for Multi-Use Radio
Service. This service was created in 2000 for use in the United States.
MURS is a short range (can be several miles) service that uses the VHF
(Very High Frequency) radio spectrum. The FCC does not require users of
products for these bands to be licensed.
If you would rather have the
construction intercoms calling your cell phone, you can get a
version that works on AT&T or T-Mobile that dial out any three phone
numbers you want. When someone presses the button, you'll be talking to
them on your phone. This eliminates workers having to use their private
cell phones to call you, or worse, having to come find you. All these
units have a relay you can activate remotely that you could also use to
unlock a door or gate, activate a siren, or for any application that
requires a switch activation.
Either solution increases productivity and safety on the job site.