SSRF-Lite reference data

Cook County Interoperability

Systems · US / IL / Cook / Countywide · Public Safety · Updated 2026-10-01 · systems/US/IL/Cook/_Countywide/public_safety/cook_county_interop.yml

Public safety

Channels

9 assignments, sorted by frequency. Frequency is what your radio receives; input is what it transmits on for repeaters.

Freq (MHz)	Mode	Tone / CC	Name	Usage	Callsign	Location	Service
153.7700	FM	CTCSS 156.7 Hz	Cook I/O VMetro3	repeater	KSC711	Cook County, IL (countywide)	Public safety
154.1300	FM	CTCSS 156.7 Hz	Cook I/O VMetro4	repeater	KSC711	Cook County, IL (countywide)	Public safety
154.2200	FM	CTCSS 156.7 Hz	Cook I/O VMetro5	simplex	KSC711	Cook County, IL (countywide)	Public safety
154.9950	FM	CTCSS 107.2 Hz	Cook Interop V1	repeater	KLR279	Cook County, IL (countywide)	Public safety
155.5350	FM	CTCSS 107.2 Hz	Cook Interop V4	repeater	KSA717	Cook County, IL (countywide)	Public safety
155.5950	FM	CTCSS 107.2 Hz	Cook Interop V3	repeater	KSA717	Cook County, IL (countywide)	Public safety
155.6400	FM	CTCSS 107.2 Hz	Cook Interop V2	repeater	KSA717	Cook County, IL (countywide)	Public safety
453.7500	FM	CTCSS 156.7 Hz	Cook Interop U2	repeater	WQLS615	Cook County, IL (countywide)	Public safety
453.9500	FM	CTCSS 141.3 Hz	Cook Interop U1	repeater	WQLS615	Cook County, IL (countywide)	Public safety

1 location.

loc_cook_county

Callsigns: KLR279, KSA717, KSC711, WQLS615

org_cook_interop

What it takes to transmit on these channels.

FCC · Class: Part 90 Public Safety / Interoperability

TX restricted to licensed public safety users. RX-only for general public.

Where this data came from. Verify on the air before relying on it.