Click here for Adobe Acrobat version
Click here for Microsoft Word version


This document was converted from Microsoft Word.

Content from the original version of the document such as
headers, footers, footnotes, endnotes, graphics, and page numbers
will not show up in this text version.

All text attributes such as bold, italic, underlining, etc. from the
original document will not show up in this text version.

Features of the original document layout such as
columns, tables, line and letter spacing, pagination, and margins
will not be preserved in the text version.

If you need the complete document, download the
Microsoft Word or Adobe Acrobat version.



Atlanta Regional Office
P.O. Box 1493
Powder Springs, GA  30127

July 20, 2018

Carlos W. Morrero
Balch Springs, TX 75180


Case Number: EB-FIELDSCR-18-00026994

The Federal Communications Commission (FCC or Commission) received a complaint from Dallas County (Texas) Consolidated Services concerning interference to GPS receivers on fleet vehicles.  Agents from the Dallas Office of the FCC’s Enforcement Bureau (Bureau) conducted an investigation on June 21, 2018 and determined that the source of the interference to GPS receivers was a wideband signal centered on 1575 MHz, the GPS frequency designated L1.  The signal was emanating from a GPS jammer located in the County’s fleet vehicle marked as HN008.  Mr. Morrero was driving the vehicle and admitted to operating the GPS jammer.  Mr. Morrero voluntarily relinquished the GPS jammer to the agents.  
Persons operating or using radio transmitters must be licensed or authorized by the FCC, pursuant to Section 301 of the Communications Act of 1934, as amended. 47 U.S.C. § 301. The only exception to this licensing requirement is for certain transmitters using or operating at a power level that complies with the standards established in Part 15 of the Commission's rules.  47 C.F.R. §§ 15.1 et seq.

  In addition, radio transmitting equipment must comply with FCC rules. 47 C.F.R. Part 2, Subpart J.

  Section 333 of the Act prohibits willful or malicious interference with any radio communications of any station licensed or authorized by or under the Act or operated by the United States Government. 47 U.S.C. § 333.

  In addition, Section 302(b) of the Act, and Section 2.803 of the Commission’s rules, prohibit the manufacture, importation, marketing, sale or operation of devices deliberately designed to jam or disrupt wireless communications. 47 U.S.C. § 302a(b); 47 C.F.R. § 2.803.


The Commission has issued multiple Public Notices specifically stating that the sale and use of transmitters designed to prevent, jam, or interfere with the operation of cellular and personal communications service (PCS) telephones or other communications devices is unlawful. See, e.g., Office of Engineering and Technology and Compliance and Information Bureau Warn Against the Manufacture, Importation, Marketing or Operation of Transmitters Designed to Prevent or Otherwise Interfere with Cellular Radio Communications, 15 RCC Rcd 6997 (OET/CIB 1999); Sale or Use of Transmitters Designed to Prevent, Jam or Interfere with Cell Phone Communications is Prohibited in the United States, 20 FCC Rcd 11134 (EB/OET/WTB 2005); CONSUMERS BEWARE:  It is Unlawful to Use “Cell Jammers” and Other Equipment that Blocks, Jams, or Interferes with Authorized Radio Communications in the U.S., 26 FCC Rcd 1329 (EB 2011); CONSUMER ALERT:  Using or Importing Jammers is Illegal; Monetary Penalties Can Exceed $100,000 per Violation, 27 FCC Rcd 2309 (EB 2012); WARNING:  Jammer Use is Prohibited, Prohibition Applies to Use by the Public and State and Local Government Agencies, Including State and Local Law Enforcement Agencies, 29 FCC Rcd 14737 (EB 2014). 


The operation of the device utilized by you may constitute a violation of Sections 333, 302(b), and 301 of the Act, as described above. 47 U.S.C. §§ 301, 302a(b), 333.

  Such operation may subject you to substantial monetary forfeitures, in rem arrest action against the offending radio equipment, and criminal sanctions including imprisonment. See 47 U.S.C. §§ 401, 501, 503, 510.

  Because unauthorized operation creates a danger of interference to important radio communications services, and may subject the operator to severe penalties, this warning emphasizes the importance of complying strictly with these legal requirements.


You have ten (10) days from the date of this notice to respond to the allegations in this letter.  Your response should be sent to the address in the letterhead and reference the listed case and document number.  Under the Privacy Act of 1974, 5 U.S.C. § 552a(e)(3)
 we are informing you that the Commission’s staff will use all relevant material information before it to determine what, if any, enforcement action is required to ensure your compliance with FCC Rules.  This will include any information that you disclose in your reply.

You may contact this office if you have any questions.

Ronald Ramage
Regional Director
Region Two
Enforcement Bureau
Federal Communications Commission  

    	Enforcement Advisory No. 2014-05