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US > Illinois > Cook (County) > Chicago Midway Airport - Department of Aviation - 800 MHz P25 Phase II

Chicago Midway Airport - Department of Aviation - 800 MHz P25 Phase II

System Name:Chicago Midway Airport - Department of Aviation - 800 MHz P25 Phase II
Location:Chicago, IL
System Type:Project 25 Phase II
System Voice:APCO-25 Common Air Interface Exclusive
Last Updated:November 9, 2017, 3:42 pm ((15) Talkgroups Updated (multi-category change))

Important Note

Some talkgroups on this system are using Project 25 Phase II TDMA modulation which can ONLY be monitored using a P25 Phase II compatible scanner.

Please visit the RR Wiki Project 25 page for additional information.

System ID List

System ID   WACN  
87d   BEE00  

Latest News Update Posted on 2017-11-09 10:34:51

This system is in the process of replacing the Midway Airport UHF T-band system.

Misc System Information

City of Chicago OEMC Public Safety Radio System

Justification for an Extended Implementation Period
The Office of Emergency Management and Communications of the City of Chicago respectfully
requests an extended implementation period of five (5) years for constructing and placing our
proposed system in operation.

The City of Chicago is beginning an effort to modernize our land mobile radio communications.
Our goals are to improve efficient use of our existing channels, consolidate disparate systems,
enhance security, and plan for T-Band migration. We plan to repurpose channels already
licensed to the City of Chicago and to use those channels efficiently for our first responders and
the greater good of the citizens of, and the visitors to, our city.

This project is being undertaken for three specific reasons: 1.) to bring together several disparate
systems; 2.) to combat the amount of unauthorized transmissions on our current channels; and 3.)
to provide a path for our transition from the T-Band as mandated by the Federal government.
A significant benefit of this project is not only interoperability between al of the many critical
users in the city, but also true operability.

An opportunity exists for the City of Chicago to repurpose 800MHz channels that have been
used for our Computer Aided Dispatch (CAD) system because of advances in data
communications, the use of private public partnerships, and the potential adoption of FirstNet.
We propose to repurpose our existing data channels and combine them with our existing
800MHz trunked voice channels. Our goal is to consolidate five different trunked systems in the
city into one interoperable network.

We are proposing a multi-phased plan for slow growth over the next five years, but with tangible
benefits at the end of each phase. Our first step is to consolidate the existing trunked systems and
channels. We will also integrate Chicago Midway International Airport’s system. Midway
currently uses T-Band frequencies. We plan to integrate with the City of Chicago’s Department
of Water Management (DWM) to provide enhanced coverage within their critical infrastructure.
Our first phase will consist of 13 simulcast sites (8 Tx/Rx and 5 Rx only), one ASR at Midway,
and two separate conventional in-building systems at the DWM filtration plants.
The second phase will modernize O’Hare International Airport’s operations and public safety
systems with 800 MHz. The subsequent phases will create a framework and methodology to add
more departments by adding capacity to the simulcast subsystem accomplished through
reallocating additional current data system frequencies. Later phases will integrate the Chicago

Fire Department, Chicago Police Department Patrol Operations, and Chicago’s public works
systems to achieve fully unified city radio.

Below is the proposed implementation schedule.
OEMC Channel deployment plan
base stations Implementation

Phase Schedule Added
Added Departments Total
1 9/2017 12 CPD (Specialized Units), Midway 3,000
2 7/2018 17 Water Dept., O’Hare, additional CPD units 6,200
3 6/2019 13 Public Works, additional CPD/CFD units 9,500
4 6/2020 6 Parks, Support Services 12,000
5 6/2021 6 CPD/CFD Citywide Operations 20,000

System Frequencies
Red (c) are primary control channels | Blue (a) are alternate control channels | Site Map(s): FCC Callsigns RR Locations

RFSS SiteNameFreqs     
1 (1) 002 (2) Midway Airport851.1875 851.3375 852.5375a 852.7625a 853.325a 853.725c

System Talkgroups
List All in one table     Show New Talkgroups

Public Safety Talkgroups

DEC HEX Mode  Alpha TagDescriptionTag  
27002 697a T MDW Security Midway Security  Security 
27003 697b T MDW Chicago PD Chicago Police Operations  Law Dispatch 
27004 697c T MDW Chicago FD Chicago Fire/EMS Operations  Fire Dispatch 

Midway Operations Talkgroups

DEC HEX Mode  Alpha TagDescriptionTag  
27008 6980 T MDW Operations Midway Operations  Public Works 
27009 6981 T MDW Admin Midway Administration  Public Works 

Midway Fleet/Airport Maintenance Talkgroups

DEC HEX Mode  Alpha TagDescriptionTag  
27000 6978 T MDW Trades Midway Electricians / Mechanics  Public Works 
27001 6979 T MDW Laborers Midway Laborers / Construction  Public Works 
27005 697d T MDW MTD Midway Motor Truck Drivers  Public Works 

Incident / Com Channels Talkgroups

DEC HEX Mode  Alpha TagDescriptionTag  
27010 6982 T MDW Incident Midway Incident  Multi-Talk 
27011 6983 T MDW Com-1 Midway Com-1  Multi-Talk 
27012 6984 T MDW Com-2 Midway Com-2  Multi-Talk 
27013 6985 T MDW Com-3 Midway Com-3  Multi-Talk 

Snow Channels Talkgroups

DEC HEX Mode  Alpha TagDescriptionTag  
27006 697e T MDW Snow-1 Midway Snow-1  Public Works 
27007 697f T MDW Snow-2 Midway Snow-2  Public Works 
27015 6987 T MDW Snow-3 Midway Snow-3  Public Works 

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