Q&A: Mark Aitken on Dallas Next-Gen SFN Trial

BALTIMORE Two months ago, Sinclair Broadcast Group, Nexstar Media Group, Univision and American Tower announced they would work together to setup an ATSC 3.0-based single frequency network in the Dallas market. Work is progressing on the SFN, which with a bit of regulatory help from the FCC should be partially lit up before next month's NAB Show in Las Vegas.

The SFN effort is more than simply a trial of Next-Gen television, however. It is also a test of a proposed ATSC 1-to-ATSC 3.0 transition that relies on spectrum clearing, channel sharing and what may be an unprecedented level of cooperation among competing broadcasters.

Mark Aitken, vice president of Advanced Technology at Sinclair Broadcast Group, has been at the center of the rollout of this Next-Gen SFN trial. In this interview, he discusses how work on the single frequency network is progressing and how the trial will provide Sinclair with critical data that will help it achieve its goal of deploying SFNs nationwide to usher in a new era of television.

(The following is an edited transcript.)

TVTechnology: Sinclair, Nexstar and Univision, along with American Tower Corp., announced in January the joint construction and operation of an ATSC 3.0 single frequency network in Dallas. Can you bring me up to date on where the project stands?

Mark Aitken: There are three new SFN sites that will host the Next-Gen service of five local Dallas stations. We refer to this as a multi-channel, multi-tenant SFN obviously Next-Gen-related.

We are in the process of providing a network infrastructure that ties to all of those facilities so that we have what we refer to as a Next-Gen Broadcast Operations Center. That will be a local presence that also is capable of being run from Baltimore [the home of Sinclair's headquarters].

On a local level, we have the issue of getting the SFN up and running. First off is the main transmission site with Next-Gen, tying that into multiple SFN sites and all of the work that goes along with that, including timing and determining the proper power overlaps.

Once that is working, we must address how to operate that as a remote site. Eventually, that operation will go back to a regional center because it is envisioned that Dallas is just one of a number of DMAs that get serviced from a regional hub.

[Dallas Getting Single Frequency Network for ATSC 3.0 Deployment]

TVT: What stations will participate?

MA: The target stations and I say target stations because all of this is subject to FCC approval are KSTR, a UniMas station; KTSD, an independent owned by Cunningham Broadcasting; KUVN, the Univision affiliate; KDAF, the Tribune Broadcasting CW affiliate; and a fifth station, which I cannot divulge at the moment.

Two of those stations KSTR and KTXD will relieve themselves from their ATSC 1 activity and be hosted by the others in a channel-sharing arrangement. This is important: this channel sharing means there will be no channels lost to over-the-air viewers. None of the core channels nor the Diginets will be lost.

All five will also broadcast all of their channels core and Diginet as Next-Gen service on the SFN. I think that is a total of 20 channels.

TVT: That setup must put big demands on MPEG-2 encoders for the ATSC 1 side of the operation.

MA: This is a crowded field, and we need capacity for additional channels on the 1.0 stick. What that encompasses is bringing in new software-based encoders that are being optimized for a new and different level of service.

In that regard, we have a vendor with encoders that will do one HD and depending on program content five, six or seven SDs at the same time. Or, they are capable of supporting three HDs at the same time, or supporting a whole host of combinations in between.

TVT: I've often heard it said that getting a group of broadcasters to agree to anything is like herding cats. This Dallas arrangement seems to fly in the face of that.

MA: My emphasis in Dallas is on learning how to get along. None of this happens without participation and cooperation.

It's about keeping that 1.0 piece whole, not impacting the consumer. Not impacting the revenue of stations and making way to fully impact the unleashing of new, future services. Those things equate to keeping the industry alive.

TVT: What is the target launch date?

MA: We are hoping to have part of the system up and running prior to NAB. I say trying to because once you figure out who your partners are for the sharing on the 1.0 side, you've got notification requirements and FCC filing requirements for post licensing through the commission.

If you look at what came out of the rulemaking, a secondary license gets issued for the purposes of being allowed to carry your content on another channel [channel sharing to continue 1.0 service]. And that's further made difficult if you have a PBS non-com in that mix because of the nature of non-com rules. On top of that, the FCC form called out [in the ATSC 3.0 rulemaking that details the 1.0 hosted environment] doesn't even exist at the moment. So, we're working very closely with the FCC.

TVT: You've mentioned in the past that Sinclair wants to rollout a nationwide network of 3.0 SFNs. Will this SFN trial help you achieve that goal, and if so, how?

MA: What Dallas allows us to do is check off the list, OK, here's the equipment, here are the available vendors, here is the project timeline and here is the sequence of events.

It's a project in its own right, and it has its own timeline impacted by deliveries and acceptance and commissioning and all of those things. When you are talking about multi-channel, multi-tenant sites for SFNs, you're building new transmission facilities.

It is really understanding what resources are available, what capitalization is required, what the interrelated services are and ho

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