KNOW
City of license	Minneapolis-St. Paul
Branding	Minnesota Public Radio
First air date	1967
Frequency	91.1 FM (MHz) (Also on HD Radio) 91.1-2 FM Classical 24 (HD Radio)
Format	Public; News/Talk
Power	100,000 watts
Class	C
Callsign meaning	the word know
Former callsigns	KSJN (1967-1989)
Affiliations	MPR, NPR
Owner	Minnesota Public Radio
Sister stations	KCMP, KSJN
Webcast	Listen Live!
Website	http://www.mpr.org/

KNOW (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 had previously gone 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.

WLOL 1330 AM was purchased by MPR in 1980 and carried the KSJN call sign until 1989 when the KNOW letters became available (the name had previously been used by a station at the University of Texas at Austin for 50 years). The AM signal was later spun off into a for-profit subsidiary to help fund the public broadcaster, and was eventually sold off. As of 2005 it goes under the original WLOL name.

In the 1970s, KSJN 91.1 FM and WLOL 99.5 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. Somewhat ironically, KNOW currently broadcasts in monaural as its schedule is not music-focused.

See also

• KCMP, MPR's eclectic music station
• KSJN, MPR's classical music station

External links

• Minnesota Public Radio
• MPR: KNOW 91.1/KSJN 99.5/KCMP 89.3 Minneapolis/St. Paul
• Query the FCC's FM station database for KNOW
• Radio Locator information on KNOW

References

• Mark Durenberger (1999). Early quad-casts and other fun. The Broadcast Archive: War Stories.