Do you remember MEOV?


        Radio on FacebookJoin us on Facebook

Thus MEOV was born. It offered a wonderful means of providing a way around a potential difficulty in meeting the approved radiation pattern. So the wise thing to do whenever a directional antenna pattern was filed was to add a few percent more than the theoretical pattern in any potentially troublesome areas. As time passed it became very unusual to see a proposed DA pattern without an MEOV. As a matter of fact, several consulting engineers have been known to put an MEOV around the full 360 degrees of a pattern. Actually, this is not quite as strange as it sounds. The electronic environment surrounding directional antenna stations is still changing for the worse, and presenting more tower structures than there were 80 years ago. It was becoming more difficult every year to construct and proof a new directional when proposing a new antenna system. In much the same way as MEOV was developed, time passed and another problem involving theoretical patterns and MEOVs began to develop.

Meoving, I mean moving on

Around the end of the 1970s it became apparent that some confusion would often exist for both FCC engineers and consulting engineers; it was often difficult to determine looking through the files whether an MEOV or the theoretical pattern had been used in the final operation. To avoid this increasing confusion the Commission decided to introduce the standard pattern for directional antenna applications. The standard pattern was produced by adding a term representing the minimum allowable radiation to the generally used equation in directional antenna design. Thus was born an acceptable antenna pattern that could never decrease to zero in a null.

The Commission generated and provided a list of standard patterns for all licensed AM directional stations in the early 1980s. Later it issued the edict that all applications involving directional antennas must be based on the standard pattern. It was inevitable, of course, that there would be instances when the standard pattern just couldn't fit due to excessive radiation on one or more azimuths. To take care of these situations, augmentation was allowed as described in the commission's rules. Provided that the excessive radiation did not produce unallowable interference the pattern could be augmented over the pertinent arc. Appropriate information concerning the degree of augmentation used is noted in the directional antenna data. Thus any engineer can easily and accurately obtain precise information on any licensed directional station or applicant and the theoretical DA pattern with MEOV is no longer used.


E-mail Battison at batcom@ohio.net.




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.

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

The Motor Racing Network Takes to the Road

When building its new broadcast production vehicle, MRN applied lessons learned from the past.

Browse Back Issues

[an error occurred while processing this directive]