A provision had been added to the
Communications Act of 1934 in late 1991 which mandated that priority for expanded band assignments would be given to existing daytime-only stations that were located in a community with a population over 100,000, and which also did not have any full-time stations.
[21] The two authorized stations that met this standard became the first two to begin broadcasting on the new band: WJDM, 1660 kHz in Elizabeth, New Jersey (now
WWRU in Jersey City, New Jersey) in late 1995,
[15] and KXBT (now
KDIA), 1640 kHz in Vallejo, California in early 1996.
[22] These two are the only expanded band stations in the United States authorized to use 10 kW at night.
[23][24]
On March 22, 1996 the FCC announced a revised allocation table, consisting of 87 stations,
[25] but this too was eventually withdrawn due to errors. A third, and final, allocation, now approving 88 stations, was announced on March 17, 1997. In order to ease the transition, the FCC provided that both the original station and its expanded band twin could optionally operate simultaneously for up to five years, after which owners would have to turn in one of the two licenses, depending on whether they preferred the new assignment or elected to remain on the original frequency.