Land Mobile Radio Users Claim DTV Repack Is Causing ‘Harmful Interference’ to Communications

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WASHINGTON—Several groups representing users of private land mobile radio (PLMR) systems are urging the FCC to enforce rules that prevent interference from TV stations that recently moved their transmission facilities during the three year-channel repack that recently concluded.

In a letter to the FCC, the Land Mobile Communications Council asked the commission to take action against numerous instances of radio interference from stations that moved to new channels as a result of the 2017 spectrum auctions that transferred portions of broadcasters’ 600 MHz spectrum mostly to wireless carriers seeking to upgrade to 5G. 

These PLMR facilities have been in operation for decades and provide essential fleet dispatch communications for a broad range of business and governmental users, including hospitals, school buses, roadside assistance, highway maintenance, refining, petrochemical production, high voltage electrical repair and firefighting.

Interference issues between the two systems is nothing new. In the mid-2000s, the FCC had to intervene when reports of garage door openers were also interfering with PLMR systems. Those situations and others like that, the LMCC said, were temporary and usually fixed in a reasonable time period and didn’t have the same impact. 

“This interference is so strong that it takes the PLMR systems off the air and is occurring for many hours several days a week or even multiple consecutive days,” the LMCC told the FCC.

LMCC says the situation represents a threat to public safety and to the loss of business. 

“This interference has rendered affected PLMR facilities entirely unusable in certain markets, resulting in hundreds of thousands of dollars of lost revenue as customers of commercial systems are forced to search for alternative communication options and incurred expenses as licensees have sought remedial action by the broadcasters and/or acquired other spectrum to which their operations could be moved,” the LMCC said. “The interference with what had been reliable communications endangers the safety of employees, disrupts operations at affected facilities and poses a major threat to public safety in certain instances. The urgency of the problems demand FCC action to enforce those regulations and policies as promptly as possible and to avoid the creation of similar problems in the future.”

LMCC said it assumed that the stations causing the interference are ones that recently moved due to the repack and as such, are obligated to resolve the interference issue.

PLUS: Repack Crosses the Finish Line

“In such cases, the FCC has relied on its long-standing ‘newcomer’ policy pursuant to which new licensees are responsible for resolving interference caused by their operations even if all parties are operating in accordance with the rules and the terms of their authorizations,” it told the commission. “In this instance, it is vital that the newcomer DTV stations assume this obligation because there are no anti-interference solutions available to the PLMR licensees.”

Citing rules that require TV stations to identify potential interference before construction, the LMCC said the issue can be easily resolved if the FCC enforces those rules. 

“A number of new permittees have been diligent both in identifying potentially affected PLMR systems and, more importantly, in implementing the necessary filtering to avoid causing interference,” LMCC said. “Their success makes clear that those facilities can co-exist when appropriate interference mitigation measures are taken by the DTV station.”

The Enterprise Wireless Association echoed LMCC’s concerns and calls for action. 

“Some EWA members are so frustrated that they wonder if the reaction of a few TV stations might be ‘There is nothing we can do; the environment is the root cause; we didn’t want to move in the first place; or, maybe the PLMR incumbents will go away in time and leave us alone,’” said EWA President Mark Crosby. “Of course, these are unacceptable responses as the PLMR industry is as vital to the well-being of this country as are broadcasters, even if not as well known. The LMCC seeks only a fair hearing and the FCC’s active support towards a resolution. That should not be wishful thinking. EWA remains optimistic.”

The LMCC’s report citing specific interference cases is available here

Tom Butts

Tom has covered the broadcast technology market for the past 25 years, including three years handling member communications for the National Association of Broadcasters followed by a year as editor of Video Technology News and DTV Business executive newsletters for Phillips Publishing. In 1999 he launched for internet B2B portal Verticalnet. He is also a charter member of the CTA's Academy of Digital TV Pioneers. Since 2001, he has been editor-in-chief of TV Tech (, the leading source of news and information on broadcast and related media technology and is a frequent contributor and moderator to the brand’s Tech Leadership events.