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Narrowbanding is an effort by the Federal Communications Commission (FCC) to ensure more efficient use of the VHF and UHF spectrum by requiring all VHF and UHF users to migrate to at least 12.5 kHz efficiency technology by December 31, 2012.
Why is the FCC mandating Narrowbanding?
The purpose of Narrowbanding is to make more efficient use of the VHF and UHF frequencies by creating additional channels. As many of you know, these channels are highly congested and there aren't enough channels available. That makes it challenging for organizations to expand their current two-way radio system or implement new systems.
What are the benefits?
Once you've converted your equipment to operate on the new 12.5 kHz channels, you'll notice your two-way radios are less susceptible to interference and you'll be able to leverage the latest technology applications.
What frequency bands are impacted by the Narrowbanding mandate?
The 150-174 MHz and 421-512 MHz bands are required to meet the Narrowbanding mandate.
Can I continue to operate at the 25 kHz frequency after December 31, 2012?
No. The FCC is prohibiting organizations from operating at 25 kHz after the deadline has passed. By not complying, you will potentially incur a large fine and lose your license.
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You are not required to implement digital technology to meet the Narrowbanding requirement. You can still use analog or digital equipment as long as they operate at 12.5 kHz efficiency.
Am I required to change frequencies or obtain new channels?
Narrowbanding does not require you to move to another frequency band or different channels. It only requires that you reduce your bandwidth from 25 kHz to 12.5 kHz and change your license. In effect you narrow the width of the bandwidth of your radio transmission (from 25kHz wide to 12.5 kHz wide).
Will I lose coverage area when I migrate to meet the Narrowbanding requirement?
The FCC has estimated that Narrowband compliance may result in a 3 dB loss of signal strength. This rule of thumb is based upon a "plain vanilla" Narrowbanding scenario where a 25 kHz analog system converts to a 12.5 kHz analog system. Converting to a digital 12.5 kHz mode should not reduce your coverage, and it might even provide greater range. Remaining analog in a 12.5 kHz mode, you could expect to have slightly less range.