Saturday, December 24, 2022

OpenMHz Returns in Service on December 23, 2022 After an Outage

OpenMHz was back in service  after an outage at 8:17 p.m. on Friday, December 23, 2022. Archived records before 8:17 p.m. remained logged, but were not re-connected to any audio. The outage may have been caused by an SSL issue with a third-party service, but this was not confirmed.

Sunday, December 18, 2022

OpenMhz Malfunction: No Audio, Website Skips Rapidly Through Audio Message Entries

SUN DEC 18 2022 --, beginning around Friday, December 16, 2022 has had a technical problem that skips through each audio segment and plays no audio.  The website is logging audio entries, but not playing audio. The malfunction is a reproducible error on Google Chrome, Safari, and iOS.

The error might be caused by an SSL issue affecting a third-party host that servers audio files.

Sunday, August 7, 2022

Chicago Fire Department OEMC 800 MHz Available on OpenMHz

Sunday morning August 7, 2022 the CFD Talkgroups for Chicago Fire Department  OEMC (800 MHz) were noticed on OpenMHz. The start date for the 800 MHz monitoring on OpenMHz was not initially known. (800 MHz)***

***NOTE: CFD has had trouble with the 400 MHz system, and has frequently switch to the 800 MHz system.

Tuesday, June 21, 2022

Chicago Fire Department Temporarily and Intermittently Changes Radio Calls to 800 MHz Talkgroups Possibly Due to Atmospheric Conditions Affecting UHF 400 MHz Frequencies

During mid-June 2022, Chicago Fire Department radio calls were switched to the 800 MHz talkgroups that are also available to Chicago Fire Department operations. The reason for the switch was possibly due to atmospheric conditions that were causing interference on the UHF 400 MHz frequencies.

Degradation to reception was also observed on public safety scanning radios in Arlington Heights with increased difficulty understanding radio messages.

Eric Tendian added the 800 MHz talkgroups to his live feeds available on his YouTube channel ...

On Tuesday, June 21, 2022, Chicago Fire Department was observed operating on the UHF frequencies.

See also ...

ChicagoFireScanner | CFD

Sunday, January 2, 2022

Unwanted Interference on Lake County OpenMHz Removed Late 2021 or Early 2022

An encrypted frequency or talk group or other interference was removed from the Lake County OpenMHz section ...


Broadcastify ...

The problem was an issue with a local application of the service and was not an issue with the OpenMHz system.

Saturday, September 25, 2021

Champaign County Added to

A page for Champaign County was added today, Saturday, September 25, 2021, that featured OpenMHz TalkGroups for  METCAD - Champaign County, IL.

The OpenMHz feed features TalkGroups from law enforcement, fire dispatch and ambulance dispatch covering Champaign County. The area covers Champaign, Urbana, University of Illinois, Rantoul and more.

The page also features specific links that go directly to FIRE or EMS related TalkGroups.

The page can be reached at ...


Monday, December 31, 2018

New Chicago Fire Department Radio Site Appears on OpenMHz

Chicago Fire Department's radio system appeared on, possibly during the last week of 2018. The Chicago Fire Department P25 system includes filters for Group Names ...

Fire (Main and North)
EMS (Main and North)
CFD North
CFD South

Talkgroup filters provide about the same functionality compared to Group Names, except allow the separation of EMS Main (North) and EMS Englewood (South).

The source and location of the radio monitoring facility was initially anonymous.

The url for the Chicago Fire Department radio site is ...

OpenMHz utilizes a Software Defined Radio (SDR) that is combined with a computer, and allows the recording of multiple talkgroups simultaneously, and then archives each radio message -- logging the date, times and duration of the messages. OpenMHz audio can be monitored live or can be monitored historically by listening to a specific message or playback a historical period. OpenMHz initially provides a 5-day archive of talkgroup messages.

Public safety communications is among the most valuable information that a municipality acquires. Real time and playback access is vital for safety of citizens' protection from danger, such as shootings, hazardous materials, property damage, and other life or death situations.