IBOC Mask Compliance


        Radio on FacebookJoin us on Facebook

A hybrid signal has challenges, but one method simplifies the process.

IBOC basics

Figure 2. Combined transmitter configurations. Click to enlarge.

Figure 2. Combined transmitter configurations. Click to enlarge.


Hybrid IBOC transmitters either combine the analog and IBOC signal at some level and apply them to the antenna (called a combined configuration shown in Figure 2) or the analog and digital transmitter signals are applied separately to an antenna (called a separate configuration shown in Figure 3). Whichever configuration you operate will determine the steps necessary to measure compliance with emission masks.

There are two emission masks that are important to check for compliance: The FCC emission mask and the NRSC emission mask.

Figure 3. Separate transmitter configurations. Click to enlarge.

Figure 3. Separate transmitter configurations. Click to enlarge.


The FCC emission mask is defined in FCC Rule 73.317 and deals with the analog waveform. This article will focus on the NRSC emission mask. The NRSC emission mask definition and other important documents can be found at the NRSC website. NRSC-G201-A, An RF Mask Compliance Measurement Methods and Practice document was published in April 2010, providing guidance on how to demonstrate compliance. There are many ways to make compliance measurements and the benefit of the NRSC-G201-A document is that it simplifies the process, makes it easier to understand, and reduces the amount of time and measurement points for reliable compliance measurements.

- continued on page 3



Acceptable Use Policy
blog comments powered by Disqus

[an error occurred while processing this directive]

Today in Radio History

Milestones From Radio's Past

The history of radio broadcasting extends beyond the work of a few famous inventors.

Digital Edition

Each Issue as a Digital Edition

Read each issue online in our Digital Edition Format in your Web browser.

EAS Information More on EAS

NWS XML/Atom Feed for CAP Messages

The feed provides feeds for all US states and territories.

Wallpaper Calendar

Radio 2014 Calendar Wallpaper

Need a calendar for your computer desktop? Use one of ours.

The Wire

A virtual press conference

Information from manufacturers and associations about industry news, products, technology and business announcements.

Join Us Facebook Twitter YouTube LinkedIn
Radio magazine cover

Current Issue

“Free Beer” and “Hot Wings” in the Morning

Townsquare Media's WGRD builds a new studio for their syndicated morning show including video

Browse Back Issues

[an error occurred while processing this directive]