SBE Chapter 37
SBE Chapter 37
July 6, 2022  

Prior Meetings

Rohde & Schwarz

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


Mr. Peter Allen 
Mr. Jeff Andrew 
Mr. Don Backus 
Mr. Robert Ballou 
Mr. Dave Benco 
Lindsay Bold 
Mr. Thomas Bunk 
Mr. Jonathan Charry 
Chris DeMillo 
Mr. Scott Dunbar 
Mr. David Garner 
Mr. Walt Gumbert 
Mr. William Harrison 
Mr. Jim Hopfer 
Mr. Mike Howey 
Mr. Glen Hurst 
Mr. David Kolesar 
Mr. Kent Kramer 
Mr. Chuck Lindner 
Mr. Daniel Maxwell 
Mr. Anthony Moreno 
Mr. Keshore Persaud 
Mr. Perry Priestley 
Mr. J.R. Richardson 
Mr. Art Rose 
Mr. R.J. Russell 
Mr. Daniel Ryson 
Mr. John Saunders 
Mr. Dale Scherbring 
Mr. Jonathan Solomon 
Mr. Julius Suyat 
Mr. Fred Willard 

High Efficiency Solid State Transmitter Design

Guest Speaker: Walt Gumbert and Rohde & Schwarz Engineers

January 9, 2018

Our January 9th, 6:00 PM meeting was held at the U.S. headquarters of Rohde & Schwarz, a renowned manufacturer of TV and FM broadcast transmitters and test equipment based in nearby Columbia, Maryland. This meeting was a cooperative effort of our host Rohde & Schwarz USA, Inc. in conjunction with SBE Chapters 37 (Washington, DC), and Chapter 46 (Baltimore, MD).    

Walt Gumbert and several Rohde & Schwarz engineers discussed the technical merits of Dohetry amplifiers, liquid-cooled design, and methods employed to simplify ongoing transmitter maintenance.  They also covered a myriad of other topics: 

  • Product Training Program
  • Expert Discussion of FM Transmitter Products
  • Overall Transmitter Manufacturing Plant and Product Electrical Efficiency Gains
  • Review of the Firm's Background and Manufacturing Plants / Product Development
  • Sample Check List of Digital Television Repack Transmitter Points to Consider
  • Typical Site Drawing, Planning, and Upgrade Implementation
  • Transmitter Requirements to Upgrade to the New ATSC 3.0 Standard
  • Workshop Description of Doughtery Mode Amplification
  • Test Gear Lab / Calibration and Repair Facility Tour
  • Transmitter Setup
    • Conducting a Proof
    • ETL Instrument Use on a High Power Transmitter in Operation Live on the Factory Floor.
    • Hands-on Workshop

A light dinner, kindly provided by our friends at Rohde & Schwarz, was served about 6:00 PM. We briefly discussed SBE business about 6:45 PM began our presentation shortly thereafter. 

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