Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 4671; Flight Crew Type 1869
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert
ATC Equipment / Nav Facility / Buildings
During descent into FSD; we were switched to MSP center on freq 128.0. The loud side-tone/squelch/squeal was almost deafening and made comms with MSP center difficult at best; dangerous at worst. MSP center stated; 'known problem with that freq; write it up.' So I am. Crosses the line into dangerous in my opinion.
Air carrier Captain reported on descent into FSD the ZMP frequency 128.0 had a loud side-tone that was almost deafening and made communication with the Center difficult.