133.900 ORD Class B

[Premises2972]

I got a close call hit on this frequency near the lakefront a bit ago. It seems to be one of the Class B frequencies. It isn't added in the DB, can anyone confirm what this freq is used for?

 

[RichardKramer]

Goshen Municipal​

Frequency	Input	License	Type	Tone	Alpha Tag	Description	Mode	Tag
123.050			CSQ	GoshenAirpr	CTAF & UNICOM	AM	Aircraft
127.550			CSQ	GoshenAirp	Chicago Center - Low Altitude	AM	Aircraft
133.900			CSQ	GoshenAirp	Chicago Center - Backup	AM	Aircraft
133.950			CSQ	GoshenAirp	Chicago Center - Low Altitude	AM	Aircraft

 

[Premises2972]

So should it be added to the ZAU page?

 

[kevino]

So should it be added to the ZAU page?

Where on the lakefront were you when you got the close call hit? If you were along the Chicago lakefront, I'd think it would seem to be a bit of a distance for you to be getting a close call hit on a low altitude ATC freq active in the Goshen, IN area...but then again who knows? VHF air freq assignments have been known to change from time to time, and not being close to Goshen, IN, I don't know if 133.900 is currently used there. Maybe give it a listen and/or record it to see if it's currently active in the Chicago area?

 

[Premises2972]

Where on the lakefront were you when you got the close call hit? If you were along the Chicago lakefront, I'd think it would seem to be a bit of a distance for you to be getting a close call hit on a low altitude ATC freq active in the Goshen, IN area...but then again who knows? VHF air freq assignments have been known to change from time to time, and not being close to Goshen, IN, I don't know if 133.900 is currently used there. Maybe give it a listen and/or record it to see if it's currently active in the Chicago area?

I was on the north end of the city
I can still hear that frequency active in the chicago area. but its only active sometimes, its not consistently active like a normal ZAU or Tower freq

 

[kevino]

I was on the north end of the city
I can still hear that frequency active in the chicago area. but its only active sometimes, its not consistently active like a normal ZAU or Tower freq

Are you hearing aircraft, Chicago Center or both? Have you tried locating tail numbers you're hearing (using adsbexchange, etc.) to determine what sector the aircraft are in?

 

[Premises2972]

Are you hearing aircraft, Chicago Center or both? Have you tried locating tail numbers you're hearing (using adsbexchange, etc.) to determine what sector the aircraft are in?

I mostly hear aircraft and not the other side of the conversation. Next time I hear them Ill locate the aircraft, since i have heard tail numbers on there.