The buzz word
in technology today is wireless. The pages of high-technology
magazines are filled with talk of the wireless home, the
wireless office, and even the wireless nation. Wireless
is also hot in the audio industry, but we find ourselves
getting squeezed by new laws. Digital television (DTV) is
coming online, and by FCC regulation these expanded broadcast
channels are eating up the available UHF band. This situation
is a serious challenge for anyone owning or contemplating
the purchase of a wireless microphone system.
What we need
is an alternative to the disappearing UHF band. The 2.4
GHz band (2400 to 2482 MHz) fits this requirement perfectly.
This band is identified by the International Telecommunications
Union (ITU) Radio Regulations as an ISM (Industrial, Scientific
and Medical) band. This is a license-free band (you are
supposed to have a license for that UHF mic!), and by international
treaty all devices using this band are low-powered.
This lower
power requirement is a key benefit of the 2.4 GHz band.
In the UHF band wireless mics are continually defeated by
TV stations broadcasting at power levels 10,000 times greater.
By law, all 2.4 GHz devices must broadcast at dramatically
lower levels, so potential interference sources are significantly
reduced to similar devices only in the immediate vicinity.
TV stations and roaming emergency vehicles are not a factor,
nor are cell phones. Any potential for interference is now
much more manageable, even for an inexperienced user.
Another benefit
is the worldwide acceptance of this band for wireless mics.
Now touring productions can bring one set of wireless systems
and use them in every state and every country without having
to change frequencies or apply for a special license.
Not only
is the 2.4 GHz band immune from TV interference, but it
is also unaffected by all other UHF and VHF devices, such
as your existing inventory of UHF and VHF mics. As long
as these mics continue to function in the ever shrinking
television bands, they will coexist nicely with 2.4 GHz
wireless mics.
For more
information on the 2.4 GHz band, see www.fcc.gov.