Case Study

Cobb County Embraces DiagnostX as a Proactive Maintenance Tool for Two-Way Radios

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Industry: Public Safety
Location: Marietta, Georgia
Number of Radios: 5,000


  • To determine if an issue exists with a particular radio or the land mobile radio (LMR) system
  • Needed to simplify the radio maintenance process


  • Implemented the use of DiagnostX to pinpoint radios in jeopardy of failing before an emergency occurs


  • Detects radios performing poorly before the user complains of a problem
  • Reduced the cost of radio maintenance on an annual basis


The Cobb County Department of Public Safety (DPS) was created by the County’s Board of Commissioners in 1993. It has over 1,500 employees providing service to approximately 700,000 citizens.

The Department of Public Safety is responsible for nine divisions that report to the Director of Public Safety which include the Police Department, Fire and Emergency Services, 911 Emergency Communications, 800 MHz Radio System, Animal Control, the DPS Training Unit, Internal Affairs Unit, Administrative Division and the Public Safety Village. They currently have 5,000 radios in use on their LMR system.

“Our department would spend a great deal of time chasing down specific issues with the radio system that were not valid. DiagnostX revealed the problem was not with the system but with individual radios”
Tracy Roberts, former Radio System Manager, Cobb County Department of Public Safety


Before using LocusUSA’s DiagnostX System, the Cobb County Department of Public Safety used a manual process to determine if a radio was working properly or not. “We would either wait for an individual to complain of a problem; have the user bring their radio in for routine maintenances, or the radio system was providing poor coverage,” said Tracy Roberts, former Radio System Manager, Cobb County Department of Public Safety. All these processes were very time-consuming and costly to the department.

The Department of Public Safety needed to find a more proactive approach in determining radios that were experiencing a frequency error or were significantly out of alignment and bring only those radios in for immediate service, while the others could remain operational in the field.

Reason Failed


To meet these challenges, the Cobb County DPS installed DiagnostX. “You can see it actually grab the health of the radios, and identify the ones performing poorly on the network,” stated Roberts. Initially, the County moved the single DiagnostX unit among their busiest sites, but after a couple of years, they installed five more units and networked them together, placing the original unit at the corrections facility. The networked system enabled them to collect radio transmissions from multiple sites system-wide and view all the results in one consolidated management console. It also eliminated the need to repeatedly move the standalone unit.

DiagnostX can detect problem radios by measuring their alignment characteristics and field performance long-range, over-the-air, 24/7 in real-time without any user intervention while the radios are deployed in the field. Once DiagnostX evaluates the active radios on the network it then indicates the operational characteristics of each as Failed, Passed or Never Received in a report based on user-defined thresholds. One of Roberts’ favorite features of DiagnostX is the status reports. “It is what we hang a lot of our response on because it determines which radios need to be brought in for immediate service due to alignment issues or broken parts inside the radio,” she said. “The reports can be accessed remotely from any computer, which is a time saver.”

When LocusUSA released a new generation of the DiagnostX, Roberts was eager to know more. The new platform had upgraded hardware and processors, as well as a substantial reduction in size. It also offered remote receivers for the networked system, instead of using full standalone units. A new graphic user interface gave more information and better reporting in an easy to read format. The County installed the upgraded system in 2017.


“Our department would spend a great deal of time chasing down specific issues with the radio system that were not valid. DiagnostX revealed the problem was not with the system but with individual radios,” said Roberts. “Right there, that’s when I saw the most value in this worthy product.”

By pre-identifying radio communication problems with the DiagnostX System, Cobb County Department of Public Safety has experienced a higher level of radio system performance and reduced annual maintenance costs. DiagnostX has proven to be a powerful proactive maintenance tool ensuring Cobb County’s public safety personnel can feel confident their radios will work at any time.