What's Next for AM DA Performance Verification?

FCC seeks public input on further questions
Publish date:

There are now set public comment deadlines for the next rulemaking on using computer modeling to verify performance of AM directional antennas.

In September, the FCC issued a Second Report & Order and Second Further Notice of Proposed Rulemaking to allow AM broadcasters to use computer modeling, along with sampling system verification, for performance verification of AM directional antennas.

As the Second FNPRM has been published in the Federal Register, the comment and reply comment deadlines (MM Docket No. 93-177) are established as Jan. 12 and Feb. 9, respectively.

Broadcasters, broadcast engineering consultants and equipment manufacturers proposed the use of computer modeling to verify AM DA performance; the proceeding focused on the impact of nearby towers on AM antenna patterns.

Specifically, the commission is asking for comment on whether the proposed rules should apply to construction of all communications towers above a specified height, rather than just towers requiring notice to the Federal Aviation Administration and tower registration under Part 17.

Also, it asks, should the commission prohibit applicants from proposing and licensees from using a tower when the owner has not complied with notice and detuning requirements? What types of structures, such as buildings, should be excluded from the proposed rules? Should any final rule on this issue, if adopted, include a provision requiring tower proponents to protect the AM station after submitting a credible demonstration that the tower affects the AM pattern?


What’s Behind AM Receiver Performance?

While engineering is my first love, I spent most of my years in the radio business earning a paycheck as a pretty good investigative street reporter, but even those skills have not helped me to answer a basic question concerning AM radio.