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City Minneapolis-St. Paul
Broadcast area Minneapolis-St. Paul
Branding Minnesota Public Radio
Frequency 91.1 FM (MHz)
(also on HD Radio)
91.1 HD-2 Radio Heartland (Folk)
91.1 HD-3 BBC World Service
First air date 1967
Format Public; News/Talk
ERP 100,000 watts
HAAT 388.5 m (1,275 ft)
Class C0
Facility ID 42949
Callsign meaning the word "know"
Former callsigns KSJN (1967-1989)
Affiliations MPR, NPR
Owner Minnesota Public Radio
Sister stations KCMP, KSJN
Webcast Listen Live

KNOW-FM (91.1 FM) is the flagship radio station of Minnesota Public Radio's "news and information" network, primarily broadcasting a talk radio format to the Minneapolis-St. Paul market. The frequency was previously under the call sign KSJN, but the purchase of a commercial station at 99.5 MHz in 1991 allowed MPR to broadcast distinct talk radio and classical music services.

KNOW-FM's studios are located in the MPR Broadcast Center on Cedar Street in downtown St. Paul, while its transmitter is located on the KMSP Tower in Shoreview.


WLOL (1330 AM) was purchased by MPR in 1980 and carried the KSJN call sign until 1989 when the KNOW letters became available. The AM signal was later spun off into a for-profit subsidiary to help fund the public broadcaster, and was eventually sold off. The station has since reverted to their original WLOL call sign.

In the 1970s, KSJN 91.1 FM and WLOL (99.5 FM) cooperated in an experimental use of quadraphonic stereo, with each station carrying two channels of audio. However, this "quadcast" had some undesirable "ping-pong" effects, much like early stereo broadcasts using the same method did. As KNOW now mainly broadcasts spoken word programming, the station broadcasts in analog in monaural audio in order to extend the station's coverage to its fullest extent possible.

HD Radio[edit]

KNOW-FM features Radio Heartland, a Web-and HD Radio- service, on its HD Radio subchannel. Its playlist consists primarily of acoustic, singer-songwriter, folk and Americana music.[1] The service launched in December 2008.[2]

Radio Heartland's schedule also includes the programs A Prairie Home Companion and American Routes from American Public Media, and the shows Thistle and Shamrock and Mountain Stage from NPR. These additional shows were added to Radio Heartland's schedule in November 2009.[3]

Austin, Texas[edit]

The callsign KNOW was also used by a major AC radio station in Austin, Texas, located at 1490 kHz. The station signed off in 1989 after operating for 50 years. The Spanish station KLGO assumed the frequency in 1993.

Lufkin, Texas[edit]

The callsign KNOW was also used by an oldies station in Lufkin, Texas, located at 1420kHz, until it suffered a fire and shut down in 1987. It was owned by Pine Air, Inc.

See also[edit]


  1. ^
  2. ^ Schmitt, Christina. "From the Heart: Dale Connelly brings Radio Heartland to the digital world." Minnesota Monthly, February 2009.
  3. ^

External links[edit]

Coordinates: 45°03′43″N 93°08′20″W / 45.062°N 93.139°W / 45.062; -93.139