SBE Chapter 37
SBE Chapter 37
July 27, 2017  

Our Next Meeting

WJLA Television

All Are Welcome at SBE Meetings;
SBE Membership is not Required

Meeting Date:

August 8, 2017 at 6:30 PM

Location:

WJLA-TV Studios
1100 Wilson Blvd.
Arlington, VA 22209

Directions:

WJLA is located in an office building in Rosslyn, Virginia at the southeast corner of Wilson Boulevard and North Lynn Street. 

Because of limited parking options, we highly recommend taking Metro.  The Rosslyn Station is located on North Moore Street, about one half block away from WJLA.  

Driving Directions

  • From I-395, take Exit 8B for Washington Blvd. toward Rosslyn
  • Travel 0.9 miles on Washington Blvd.
  • Take the Exit toward VA-110/North Pentagon Parking; Follow signs for VA-110.
  • Travel 1.3 miles on VA-110.
  • Turn slightly left onto Wilson Blvd.
  • WJLA is on the left.

Paid parking is available in the building garage, whose entrance is accessible from Wilson Boulevard, about 50 feet to the left of WJLA's newsticker sign. 

Map:

By Mapquest

Optimizing RF Coverage for Radio and Television

Cavell Mertz Logo

Guest Speaker: John Kean and Gary Cavell

This month's SBE meeting will be a command performance from this year's NAB Convention in Las Vegas, where NAB Radio Engineering Achievement Award recipient John Kean of Cavell, Mertz & Associates, Inc., discussed the use of specially equipped drones for making field strength measurements to establish and document the "real world" performance of broadcast antennas. The presentation to SBE Chapter 37 is expected to be even better because:

  • Also speaking at this month's meeting will be Gary Cavell, a broadcast engineering consultant, licensed aircraft pilot, and principal of Cavell Mertz, who played a significant role in the development of this project.
  • John and Gary will bring the drone.
  • We'll learn about how the project has progressed since April.

Using UAV’s to make these measurements is a lot faster and dramatically more economical than other methods. Previously, the most popular method was using a helicopter to fly a series of orbits around a tower, with expensive equipment, and to then tabulate that data, and produce a report. Traditional measurements from the ground are slow and tedius since roads seldom outline a circular path around a tower site.  Also, ground based measurements tend to be affected by terrain shadowing and local clutter, which are difficult to remove, making determination of transmitting antenna radiation performance quite abstract.

Before joining Cavell Mertz, John was Senior Technologist for National Public Radio from 2004 until 2015, where he developed projects, procedures, and standards and supervised all technical projects of NPR Labs, the only not-for-profit broadcast engineering laboratory in the United States. At NPR Labs, he completed a thorough study of the compatibility of AM Modulation-Dependent Carrier Level with HD Radio®, for the National Radio Systems Committee. Also for the NRSC, he conducted a study of the performance of Single-Sideband FM Stereo and its compatibility with present-day FM receivers.

Gary Cavell is the President of Cavell, Mertz & Associates, Inc. and has worked in management and technology positions in communications and broadcast systems for over 40 years. At Cavell Mertz, in addition to being the general RF and regulatory knowledge resource, his strength is in RF systems, with a particular love for AM antenna arrays. As such, he has designed, built and certified countless station RF systems over the years.

Gary was a cofounder of Cavell Mertz and its predecessor firms in 1989, after having worked with the engineering firm of Lohnes & Culver for nine years. Before coming to the Washington, DC area, he worked in New Orleans for several years in the radio and television industry in the areas of general and engineering management, facility design and construction, program production, and station systems development. He attended the University of New Orleans and has an EIT certification. Gary has also been a radio station manager in his home town of New Orleans, and has experience as a successful small market radio station owner/operator in central Pennsylvania.

Sandwiches, kindly provided by our friends at Cavell Mertz will be served at 6:30 PM. We'll briefly discuss SBE business about 7:00 PM and begin our presentation shortly thereafter. Please RSVP by High Noon August 9th by dropping an e-mail to meet@sbe37.org and let us know if we should expect you for dinner!

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