CIDC-FM
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CIDC-FM

CIDC-FM (103.5 FM, "Z103.5") is a radio station licensed to Orangeville, Ontario. Owned by Evanov Communications, it broadcasts a dance radio format serving Central Ontario. Its studios are located on Dundas Street West in the Eatonville neighborhood of Toronto, while its transmitter is located near Airport Rd and Charleston Sideroad in Sleswick.

CIDC has historically broadcast an electronic dance music-leaning rhythmic contemporary format; it has regularly featured DJ mixshows as part of its schedule, and has also sponsored local electronic music events and compilation albums. CIDC held a 2.0 share of the market in Numeris's Spring 2018 ratings.

In addition to Orangeville, its signal covers Barrie and Kitchener, rimshots Downtown Toronto, and can be heard as far north as Bracebridge and as far south as Hamilton. Due to CIDC rimshotting Downtown Toronto, CIDC has frequently promoted itself as a Toronto station, and Evanov has made repeated attempts to move or modify CIDC's signal to better serve the Greater Toronto Area; almost all of these requests were denied by the CRTC for neglecting its formal city of licence. The CRTC also reprimanded CIDC for not specifically devoting enough on-air community interest programming, news, sports and information specific to Orangeville or Dufferin County, as specified by its license.

The Orangeville area was struck by a massive F4 tornado as part of the 1985 United States–Canada tornado outbreak on May 31, 1985, and the community felt it did not receive adequate warning from stations in Toronto. As such, an application was made to the CRTC for a radio station to serve Orangeville. CRTC approval was given for the station on September 10, 1986, under a guideline not to solicit advertising from Toronto, Barrie or Brampton. The station's frequency allocation was originally specified for Guelph, and was moved to Orangeville to allow for the service.

CIDC was launched on May 1, 1987, on 103.5 MHz with an ERP of 50,000 watts from a site located northwest of Orangeville. Its transmitter's terrain, which measured 527.3 metres (1,730 ft) height above average terrain, and tower height of 98.1 metres (322 ft) meant it was .6 metres (2.0 ft) higher than the top of CN Tower. CIDC's launch format as "DC 103.5" was 70's/80's hits.

On September 28, 1994, the CRTC approved the ownership transfer of Dufferin Communications from its shareholders to CKMW Radio Ltd., operator of Brampton multicultural station CIAO. The station was branded Hot 103.5 in February 1995 (later calling it "Hot 103 dot 5"), playing only dance music. The station then began adding more R&B and pop tracks to its Top 40/dance playlist in February 1998, and was renamed Hits 103.5.

On July 28, 2000, approval was given to relocate the transmitter site from 6 km west of Orangeville town hall to 11 km east of Orangeville town hall and decrease the station's power from 50,000 watts to 30,700 watts.

In late December 2000, the station was re-branded as Z103.5 (with the decimal point heard as "dot"), with the slogan "The Hit Music Channel", though the CIDC call letters were retained. The slogan was later changed to simply "Today's Hit Music".

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