Narrowband Modification Worksheet
Add or change to narrowband emission designators on your existing license.
Narrowband
More information on narrowbanding
Update your license emission designators and stay compliant with FCC narrowband requirements.
Why narrowband matters
The FCC narrowband mandate required VHF/UHF Industrial/Business and Public Safety licensees in the 150–470 MHz bands to operate on channels with a maximum bandwidth of 12.5 kHz (or equivalent efficiency), unless operating under a waiver.
Wideband-only operations without a waiver are no longer permitted. When you renew or modify a license, you may need to replace wideband emission designators with narrowband designators — or certify that your equipment meets the narrowband efficiency standard.
Read our renewal notice for wideband and narrowband designators →
Downloadable forms
Use these worksheets to update your license, then include the signed authorization form.
Authorization Signature
Required with every worksheet — authorizes electronic filing of your application.
Need help?
If you received a renewal notice or are unsure whether your license still lists wideband designators, call us for a free consultation. We’ll check your license and advise on the right next step.