We apologize for any inconvenience; at this time the Isabella County Administration Building is closed for asbestos abatement activities. For office locations and phone numbers click here for more information..

VHF/UHF Narrowbanding Information

2008 E. Preston St.
Mt. Pleasant, MI 48858
Phone:(989) 773-6116
Fax:(888) 384-5668

What is Narrowbanding?

  • Narrowbanding is an effort to ensure more efficient use of the VHF and UHF spectrum by requiring all VHF and UHF Public Safety and Industrial/Business land mobile radio (LMR) systems to migrate to at least 12.5 kHz efficiency technology by January 1, 2013.

What is the purpose of Narrowbanding?

  • Currently, the majority of UHF and VHF LMR licensees operate using 25 kHz efficiency technology. However, the UHF and VHF frequency bands are congested with limited spectrum available for system expansion or implementation of new systems. The migration to 12.5 kHz efficiency technology will require licensees to operate more efficiently, either on narrower channel bandwidths or increased voice paths on existing channels. This will allow creation of additional channels within the same spectrum, thereby supporting more users.

View more info on Narrowbanding ›