[continued from previous message]

Guardrail detail

NAB says errors associated with computational modeling are likely to
increase with the depth of nulls in an antenna pattern.

An image from calibration tests on ERI’s far-field, full-scale FM antenna test range. The manufacturer said the FCC’s proposed changes would be detrimental to the public and broadcasters. “ERI submits that [the] low
level of range error debunks the notion that the antenna test ranges cannot
be built and operated in a manner that provides measured results that are
equal to or superior to software simulation.”The association asked the commission to retain a limitation that directional antennas proposing a maximum-to-minimum radiation in the horizontal (azimuth) plane of more than
15 decibels will not be accepted.

“Most commonly, the purpose of employing a directional antenna by a commercial full-power FM station is to allow that station to short-space to another FM station, while maintaining contour protection to that station.
The commission’s short-spacing rules provide a lower limit on the distance
to which a station may locate with respect to other stations,” according to its filing. 

NAB believes that the present 15 dB maximum-to-minimum ratio is adequate to allow for alternative transmitter sites within the spacing limits while minimizing the risk of interference.

The association also asks the FCC for a limit of 2 dB/10-degree rate of
change in the azimuth plane.

 “The pattern comparisons in the record demonstrate that the rate of change of the antenna pattern is critically dependent upon the accuracy of the
data used in the model. Small errors in the physical dimensions used in the model can translate into larger errors in predicted antenna gain in a particular direction. 

“Therefore, NAB recommends retaining the existing limitation that
directional antennas that propose a radiation pattern in the azimuth plane which varies more than 2 decibels per 10 degrees of azimuth will not be accepted or authorized. This requirement helps ensure that modeled patterns will be realized in practice.”


Randy J. Stine has spent the past 40 years working in audio production and broadcast radio news. He joined Radio World in 1997 and covers new
technology and regulatory issues. He has a B.A. in journalism from Michigan State University.

The post NAB Sees Benefits of Directional FM Modeling appeared first on
Radio World.


///////////////////////////////////////////
Speakers Needed for NATE UNITE 2023

Posted: 29 Apr 2022 11:52 AM PDT https://www.radioworld.com/show-news/speakers-needed-for-nate-unite-2023


NATE has initiated a Call for Speakers for next years NATE UNITE, a popular conference and trade show in the wireless and broadcast infrastructure industries focused on safety.

The conference includes an array of educational sessions, safety seminars, networking receptions, luncheons, optional training courses and speakers,
which are currently being recruited.

NATE UNITE will be held February 20-23, 2023 at the Rosen Shingle Creek in Orlando, Florida. All educational sessions will take place Monday, February
20 through Wednesday, February 22.

Sessions are one-hour in length with built-in time for Q & A. All sessions
are reviewed by the NATE Educational Session Subcommittee in advance, with speaker selections made by August 12, 2022.

[For News on This and Other Shows See Our Show News Page]

Presenters will not receive financial compensation from NATE to present an education session, nor is funding for travel or accommodations provided.
All speakers, however, will receive a complimentary, full conference pass.

You can find the Call for Speakers Proposal on the NATE website. All
proposals must be submitted to Shari Wirkus at shari@natehome.com by
Friday, June 10.

The post Speakers Needed for NATE UNITE 2023 appeared first on Radio World.

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