LOUISVILLE, Ky.—Five local stations in the Louisville area have launched NextGen TV (aka, ATSC 3.0) broadcasts, with a sixth expected to be on the air next week. 

For the launch Block Communications’ CW affiliate WBKI is hosting NextGen TV broadcasts for five stations, which include WDRB (Block’s Fox affiliate), WAVE (Gray Television's NBC affiliate), WHAS (Tegna's ABC affiliate) and WBNA (a independent station owned by Word).

Kentucky Educational Television’s WKMJ PBS affiliate will launch NextGen TV signals on Sept. 19. 

Louisville viewers can find five channels over-the-air on channel 16 with a NextGen TV set. KET’s WKMJ, (PBS) will be available on channel 34 when it launches. 

The launches mean that NextGen TV broadcasts are now available to more than 660,000 viewers in the metro and outlying areas of Louisville. 

TV Tech has been following the launch of NextGen TV broadcasts around the country. Our exclusive list of where the broadcasts have been launched is available here.  

LOUISVILLE, Ky.–The Louisville market has a busy over-the-air presence with nearly 30 TV stations. WDRB Media operates two of Louisville’s network-affiliated stations: WDRB-TV (Fox) and WBKI-TV (CW), both of which had Phase 6 repack assignments. WDRB Media’s corporate owners, Block Communications, standardized on GatesAir transmitters during the recent repack for their stations in Illinois, Kentucky and Ohio, replacing long-operating tube transmitters from other manufacturers. 

A SOLID APPROACH

GatesAir made sense for many reasons, including a generous warranty that represents their customer service emphasis. New transmitters were required given the substantial frequency shifts (Channel 49 to 32 for WDRB; Channel 51 to 16 for WBKI), and GatesAir’s solid-state designs were impressive in both performance and maintenance evaluations. GatesAir’s energy-efficient designs were of exceptional importance given the very high TPOs (transmitter power output) required.

Our transmission facility sits at 964-foot elevation, with signals transmitting from a 1,000-foot tower. Clear sightlines ensure we reach viewers 60 miles from the tower. Our new Maxiva ULXTE liquid-cooled UHF transmitters are designed to optimize that market coverage, with WDRB’s ULTXE-120 model maximized for its 1MW ERP (68kW); and WBKI’s ULXTE-150 model operating at 725 ERP (58kW). The ULXTE-150 has extra headroom for an expected power raise this summer, and another possible boost in the future.

While our previous transmitters were liquid-cooled, moving to solid-state required an entire plumbing refresh and a completely new liquid-cooling infrastructure. Nine heat exchangers were installed just outside the building, while the installers from RF consulting firm Jim Stitt and Associates moved the multicabinet transmitters into their new positions. Lines were run from the transmitters to the redundant Maxiva pump modules, which transfer heat to the outdoor exchangers. This energy-efficient process keeps our cooling bills as low as possible.

Solid-state offers several benefits when it comes to liquid cooling. Our old system required SR-1 ethylene glycol, which needed a complete refresh every three years. The Maxiva system uses off-the-shelf Prestone, requiring little maintenance beyond removing some particulates with a strainer upon adding. 

Opening the front cabinet door reveals a beautiful layout that is easy to grasp. There is a minimum of parts, with redundant power amplifiers and power supplies. Each module is about 700W; if one is lost, GatesAir’s adaptive correction software masks any performance drop. With the front-panel GUI, we can monitor the status of each module, identify a power supply issue and understand when an amplifier firmware upgrade is needed. 

NEXTGEN-READY

Our ULXTE transmitter includes redundant GatesAir ATSC3-ready Maxiva XTE exciters, which brings impressive performance and design traits. GatesAir builds a mini UPS and its real-time adaptive correction (RTAC) software into the XTE. The latter is useful for monitoring signal-to-noise and shoulder performance, which will often point to problems in the antenna or transmission line if outside the threshold. 

The XTE currently shows our shoulders at –47, which is 10 Db better than the FCC specification. It was also much easier to obtain this number compared to the days of tube-type technology. If we reduce power, the RTAC software will re-adapt the shoulders to appropriate levels. And while RTAC is designed to keep the signal within its frequency, the ULXTE performs so well it is hard to imagine when that correction would be required.

As we look ahead to NextGen TV, we’re running our new RF systems with the confidence that our Maxiva transmitters and exciters will seamlessly transition to ATSC 3.0. The additional headroom will also ensure we can add new NextGen TV services when needed.  

Gary Schroder is the chief engineer of WDRB Media. He can be reached at gschroder@wdrb.com. 

For more information on GatesAir visit: www.gatesair.com/.

SHELTON, CONN.—In an effort to ease its daily news production, WDRB-TV in Louisville, Ky., constructed a second studio. New cameras, lenses, and pedestals were all acquired for the move, as were six Autoscript EPIC 19-inch teleprompters.

The EPIC combines an LED prompting screen with an integrated 19-inch full HD-SDI on-air monitor. The EPIC does not require an extra mounting bracket, allowing operators to utilize a camera’s full tilt.

The WDRB team also purchased Autoscript’s ClockPlus-E, which clips in front of the teleprompter and takes timecode data, tally status and power internally from the EPIC system as well as the TallyPlus.

WDRB-TV is the Fox-affiliate covering the Louisville metropolitan region.