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CitySault Ste. Marie, Michigan
Broadcast area[1]
BrandingThe 46th Parallel Radio
SloganThe Northern Vibes
Frequency90.1 MHz (FM)
First air date1991 (carrier current)
1993 (FM)
2016 (online)
Formatcollege radio, adult album alternative
ERP100 watts
Callsign meaningLake SuperiOr
Former callsignsWLKR
AffiliationsIntercollegiate Broadcasting System
OwnerLake Superior State University
WebsiteLaker Radio

The 46th Parallel Radio (also known as Laker Radio and Superior Radio) is an internet radio station in Sault Ste. Marie, Michigan, United States. Broadcasting a college radio format, The 46th Parallel is the campus radio station of the city's Lake Superior State University. From 1993-2017, the station broadcast at 90.1 on the FM dial with the call sign WLSO, before transitioning to an online-only format.

The station originally launched in 1991, as an AM carrier current station, broadcasting exclusively to the LSSU campus. After receiving a broadcasting license from the Federal Communications Commission, the station launched on FM in 1993. Following a listener contest earlier that year, WLSO rebranded as The 46th Parallel Radio in August 2016, and launched a new internet streaming format through the Intercollegiate Broadcasting System and Backbone Networks; the 90.1 FM signal quietly went dark by early 2017, in conjunction with WLSO's existing website and social media accounts ceasing new updates, though the station retains an FCC license.[1]

General music rotation on The 46th Parallel Radio leans towards adult album alternative music, while the station traditionally has featured student DJs hosting their own programs and custom playlists. Central Michigan University in Mount Pleasant also simulcasts their own radio station to the Sault Ste. Marie market at WCMZ-FM, though they air a National Public Radio and jazz format.


WLSO studios are located in the basement of the Cisler Center; the studio was moved to its new location in 2006 to be more visible in the campus community and easier to access by students.[2] The studio consists of management offices, a recording booth, and the on-air broadcast studio.

The station broadcasts 24 hours a day, 7 days a week year-round.[3] WLSO runs on automation whenever there is no live show in the studio, which usually occurs at night and over breaks.

WLSO has recently undertaken remote broadcasting; the station currently broadcasts live from student government meetings, concerts, and open-mic nights on campus. The studio has a 40-second broadcast delay as well as phone patch to take calls and put them on the air.


The station's transmitter site was moved in October 2007, it was formerly located in the old studio, in the east basement of Brady Hall. It was relocated to another location in Brady Hall where it was re-engineered and re-built.

WLSO operates two transmitters; the primary transmitter is a R.V.R. TEX-300-LCD installed in March 2008; the original, now a backup transmitter, consists of a Bext TEX-20-NV exciter and a separate Bext PJ-200 power amplifier. The station's antenna system is on the roof of Brady Hall, it is a 2-bay circularly-polarized radiator. Programming is sent to the transmission site utilizing the Tele-Link Studio Transmitter Link (STL) from Energy-Onix.

WLSO utilizes Sine System's Remote Facilities Controller (RFC-1) at the transmitter site, it allows for remote and automatic controls, system monitoring and acts as an alarm system calling station engineers immediately in the event of a system fault. WLSO's RFC-1 monitors 24 channels of telemetry and logs all data though GetTelemetry[4] software.

WLSO also uses as an Orban Optimod 8200-FM audio processor connected to a controlling computer at the transmitter. WLSO's air signal is continually monitored by an Inovonics FM modulation analyzer model 531 and received audio is sent back to the studio to be checked. All equipment is protected through a Polyphazor lighting-arrestor and several back-up power supplies, allowing uninterrupted broadcasts and relaying notifications from the Emergency Alert System (EAS) to the community in the event of a power disruption or other emergency.


  1. ^ "The 46th Parallel Radio - Posts". Facebook. 2018-10-25. Retrieved 2018-10-25.
  2. ^ http://www.lssu.edu/stugov/sg_res/2005-02-21.doc
  3. ^ Lake Superior State University :: Office of Student Activities & Leadership Development :: Student Handbook
  4. ^ GetTelemetry

External links[edit]

Coordinates: 46°29′31″N 84°21′47″W / 46.492°N 84.363°W / 46.492; -84.363