KNOW-FM
| 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 |
| Website | minnesota.publicradio.org |
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.
...
Wikipedia