This Week In Radio Tech (TWiRT)

Most of us in radio engineering have worked with broadcast cart machines. While it’s been a good 25 or 30 years since we’ve had them in our studios, we’ll never forget the pleasure - and occasional pain - of using them and maintaining them. But how did cart machines come to be? Were they always like the ones we grew up with in the 70s and 80s? Or did the development come with fits and starts? Andy Rector worked with broadcast carts nearly from the very beginning of their existence. He’s been interviewed many times and provided historical presentations to SBE groups, AES sections, and others. We’re delighted to have Andy Rector join us on this TWiRT episode to look at the early days of broadcast cart machines and the early technologies employed.

Young broadcast engineers are few and far between, but Cameron Lasley is making a big difference for broadcasters in Kentucky. Cam’s primary role is with wireless broadband technologies; he’s the owner of a Wireless Internet Service Provider (WISP) in Kentucky. On a future TWiRT episode we’ll discover Cam’s broadcast engineering experiences, but on this show we’re finding out about the WiFi technologies that power IP radio links. These are links that broadcasters - as well as WISPs - use every day. We’ll gain understanding of link budgets and margins, as well as best practices for modulation schemes and frequency band selection for IP radio links. There’s a lot of great information for us broadcast engineers to absorb on this episode of TWiRT.

Today’s TWiRT webcast is a double-header - two guests on very different yet important topics. First up is Robbie Hulett, owner of Tower Maintenance Corp. Robbie shares his company’s work and achievements on social media, keeping broadcasters abreast of current trends in the tower maintenance field. Perhaps some of TMC’s work will prompt others to check on and maintain their vertical structures with the attention they deserve. And Bayard “Bud” Walters - a Nashville-based radio group owner - gives us his candid thoughts about the FCC’s “Delete, Delete, Delete” regulatory reform program. The NAB has filed lengthy comments and suggestions, and Bud, owner of Cromwell Broadcasting, has a few thoughts of his own to share. See if you agree or disagree!

Congratulations to Paul Shulins, co-owner of Over The Air RF Consulting. He is the recipient of the 2025 NAB Radio Engineering Achievement Award, which was presented at the NAB Show on April 8. Paul joins us on TWiRT, along with Chris Tarr, to talk about recognizing broadcast engineers and their contributions and recognition in the broadcast industry. We’ll also look at some moments and technical achievements in Paul’s career, plus discuss engineers’ role in the future of radio broadcasting.

The NAB Show 2025, held from April 5-9 at the Las Vegas Convention Center, showcased a wide array of cutting-edge technical exhibits focused on media, entertainment, and technology innovations. There’s no way that TWiRT could bring you a wide look at the whole show, but we did manage to interview ten broadcast industry insiders in just over an hour, and we present them to you on this episode! From England to Australia, from the Netherlands to Florida, and from Minnetonka to Los Angeles, we’re letting you in on the technical and industry conversations that exemplify our experiences at NAB. Special thanks to Broadcast Bionics for providing a set for TWiRT production, and the bandwidth to send you our show!

Public radio has an audience size of around 30 million weekly radio listeners with a broader reach exceeding 57 million when including digital platforms. Public Radio engineers play a critical role in building, upgrading, and maintaining the needed facilities and infrastructure. Broadcasters go to the NAB show in Las Vegas to see and hear what’s […]

Never miss a chance to talk with John Bisset, author of the Workbench column in Radio World magazine. John joins us along with Chris Tarr to reveal useful tricks and techniques that any broadcast engineer will find helpful. See this episode’s Show Notes (on this show’s listing on YouTube and at ThisWeekInRadioTech.com). From an easy way to print cable labels, to saving your knees, to marking combo locks with the little-known resistor color code, John brings us some fun and useful ideas for living a better engineering life.

Kathy Stieler and Clark Lindstrom, two prominent leaders in the communication tower industry, are discuss best practices and emerging trends in safety within the broadcast tower sector. Kathy, affiliated with NATE (National Association of Tower Erectors), emphasizes the importance of standardized training and certification programs to ensure worker competency and safety compliance. Clark, who oversees safety initiatives at American Tower, highlights the role of technology in identifying hazards and reducing on-site risks. Both guests promote a proactive safety culture, where regular audits, clear communication, and employee empowerment are prioritized. The conversation underscores the industry’s ongoing commitment to evolving safety standards amid increasing demand for reliable broadcast infrastructure.

Ya gotta love Dustin Tatro’s journey into and through radio broadcasting. Voicing PSAs at 4 years old got Dustin an early start. Then working as a DJ, along with musical interests, honed his technical and operational skills. Now as a General Manager and Ops Manager, Dustin has demonstrably learned the engineering side of radio broadcasting. Indeed, his SBE certification, CBRE, attests to that. Dustin joins Chris Tarr and Kirk Harnack to discuss AoIP, audio processing, work working nicely, even with competing radio stations. Indeed, he joins us from the KORQ-FM transmitter site.

SD-WAN - Software-Defined Wide-Area Network - is a technology implementation designed to bring better reliability and performance to IP connections over distance. Whether across town, to remote offices, or to remote transmitter sites, SD-WAN technologies are gaining interest among broadcast engineers and IT staff. It turns out there are a lot of features - optional but useful features - that can be deployed alongside basic WAN management and monitoring. Dan Merwin and Reggie Jeffery work in broadcast and other industries to offer appropriate technologies and capabilities, improving our critical IP connections.

Megan Amoss is the assistant chief engineer for Baltimore Public Media, which includes FM stations WTMD, WYPR, WYPF, and WYPO. Starting in a Traffic Coordinator role, she progressed to taking on engineering responsibilities, eventually becoming a key figure in the technical operations of Baltimore Public Media. Megan has been instrumental in the integration of WTMD and WYPR, where she is involved in the conversion of WYPR's studios to an Axia AoIP system. Megan joins Chris Tarr and Kirk Harnack, discussing engineering challenges with some focus on metadata, which has become critical for today’s broadcasters.

John Kean, Dave Hershberger, and Tom King recently set out to take measurements of RF noise levels on various roadway types from open interstate highways to city streets, to determine how the noise would affect AM broadcast reception. These environments reflect the current habits of AM radio listening, which is primarily in vehicles. In addition to RF noise level, RF signal levels were measured for three AM stations operating on frequencies in the low, middle and high ends of the AM broadcast band. These measurements provide a better understanding of how AM radio reception is affected by RF signal strength and noise in a range of roadway environments from rural to dense urban environments. On this episode of TWiRT, John Kean and Dave Hershberger join us to describe the testing methodology and the results and conclusions we can infer from them.

Radio automation systems seem daunting at first glance. Those new to their programming and operation are often surprised by the number of pre-requisites and source material needed to put a radio format together, especially when the automation system is thought to do these things for you. Not to worry, Chris Tarr is here to clear up confusion and doubt, and help broadcasters consider some of the key aspects of implementing a radio automation playout system.

When a classic audio mixing console needs to be refurbished and brought back to life in Tennessee, everyone knows to call on Jim Gilmore. One reason is that he may have installed it in the first place! Jim might be a true Renaissance Radio Engineer! From on-air work, to traveling the world for Harris Broadcast, to engineering at The Nashville Network to CMT, to even teaching audio classes at Belmont University, Jim has certainly “been there and done that”. Join us as Jim shows us a totally refurbished audio console, originally built by WSM engineers, and used for a decade at The Grand Ole Opry at the Ryman Auditorium. Plus, meet Linda Chambers, CEO and Co-Founder of the Musicians Hall of Fame and Museum, as she takes us through Brian Ahern’s 42-food Encatron Mobile Recording Studio!

Charlie Wooten is usually dealing with tornados, thunderstorms, and hurricanes. But last week brought a rare hazard to the Florida Panhandle - an ice and snow storm. With chunks of ice falling from hundreds of feet above, Charlie was keeping his stations on the air. Let’s find out what Charlie did to prepare for this snowstorm, and how his planning for other bad weather provided more assurance for continued operation for his 12 transmitters in the Florida Panhandle.

Today we're diving into a critical topic: the evolution from solo engineering efforts to collaborative support models in broadcasting. Just as a one-person band can only play so many instruments at once, a single engineer can't tackle every technical challenge alone. By banding together and working in groups outside traditional broadcast companies, we can support one another, foster career growth, and achieve a healthier work-life balance. Our guests Rob Bertrand and Shaun Dolan aim to do just that at Inrush Broadcast Services,, a 14-person broadcast technology service provider

What kind of “radio station” is on-the-air only twice per hour? How about CBS Radio News? With the precision of a watchmaker, the CBS Radio News network delivers news updates to hundreds of radio stations and millions of listeners. Mitch Glider is the Supervising Engineer at their headquarters on West 57th Street in New York City. Through the challenges of at-home news anchors (through the pandemic) and changes in technology, Mitch and just a few colleagues keep the audio and metadata correctly routed. In this episode, we’re learning about past, present, and future network radio operations. Mitch encourages engineers to “Respect the past, and embrace the future.”

If you’re building a new radio studio, or rebuilding one, Chris Tarr is here to help. This is your opportunity to get The Ninjaneer’s expert advice without laying out thousands of dollars in consulting fees. In this episode, we’re looking at various technologies to link your radio studio with your transmitter site. There are more choices now than ever! And we’re looking at today’s radio studios; how are they different from those of the past? We think studios can be a lot simpler than they used to be, mostly thanks to Audio over IP technology.

If you’re building a new FM radio station, or rebuilding one, Chris Tarr is here to help. This is your opportunity to get The Ninjaneer’s expert advice without laying out thousands of dollars in consulting fees. This episode focuses on what to do when you get your FCC Construction Permit. Chris gives hard-earned advice on towers, antennas, transmission line, transmitter selection, and more.

What’s ahead in 2025 for radio programming? For radio talent? For radio programming executives? Where does Artificial Intelligence fit in? What audience is key to attract to radio and how can radio programmers make headway on that? How will new “PPM Wearables” affect station ratings? And how important are streaming and on-demand programs to radio’s future success? We got answers and opinions on all these questions from John Shomby at Country’s Radio Coach. John’s been a consultant, programmer, and coach focusing on Talk Radio and Country Radio formats, and he’s our guest this week filling us in on the key topics and strategies for radio’s future success.