Post by Druid Hills Radio on Nov 28, 2017 21:05:36 GMT
The Standard Broadcast Band began in 1921 with just one frequency (833 kHz).
In December 1921, 619 kHz was added for Weather and Market reports.
In September 1922, 750 kHz was added as a new "Entertainment" frequency.
On May 15, 1923, the Standard Broadcast Band was expanded to 550-1360 kHz using 10 kHz steps.
In April 1925, this was further expanded to 550-1500 kHz.
November 11, 1928 saw the first big "realignment" as the FRC shifted many stations, and deleted others, in an attempt to reduce interference.
On March 29, 1941, the band was extended to 550-1600 kHz. On this date, the NARBA frequency shift changed many stations spot on the dial.
In the early 1950s, the band was extended to 540-1600 kHz. The first 540 was
WGTH, Richmond, VA. A CP was granted for 540 on 12/17/53, with a License to cover on 5/21/54.
In mid-1961, most Class IV stations were permitted to increase power from 250 Watts to 1/.25 kW.
In 1983, most Class IV stations were permitted to increase power from 1/.25 kW to 1 kW.
In 1995, the FCC again extended the Standard Broadcast Band to 540-1700 kHz.
WJDM, 1660, Elizabeth NJ, was the first U. S. regular broadcast station to operate in
the expanded band, using 10 kW day, 1 kW night
In December 1921, 619 kHz was added for Weather and Market reports.
In September 1922, 750 kHz was added as a new "Entertainment" frequency.
On May 15, 1923, the Standard Broadcast Band was expanded to 550-1360 kHz using 10 kHz steps.
In April 1925, this was further expanded to 550-1500 kHz.
November 11, 1928 saw the first big "realignment" as the FRC shifted many stations, and deleted others, in an attempt to reduce interference.
On March 29, 1941, the band was extended to 550-1600 kHz. On this date, the NARBA frequency shift changed many stations spot on the dial.
In the early 1950s, the band was extended to 540-1600 kHz. The first 540 was
WGTH, Richmond, VA. A CP was granted for 540 on 12/17/53, with a License to cover on 5/21/54.
In mid-1961, most Class IV stations were permitted to increase power from 250 Watts to 1/.25 kW.
In 1983, most Class IV stations were permitted to increase power from 1/.25 kW to 1 kW.
In 1995, the FCC again extended the Standard Broadcast Band to 540-1700 kHz.
WJDM, 1660, Elizabeth NJ, was the first U. S. regular broadcast station to operate in
the expanded band, using 10 kW day, 1 kW night
