On Sunday, March 30, 1941, many radio stations
changed frequency because of the North American
Regional Broadcast Agreement (NARBA).
The move was meant to reduce congestion and interference
on the airwaves. In those days WPOP was known as
WNBC and it was located at
1380 kilocycles on the AM dial. Under the terms
of NARBA, WNBC would move up the dial to a wavelength
of 1410 kilocycles. This "Moving Day"
ad was published in The Hartford Courant on Sunday,
March 23, 1941.
For listeners, this meant reallocating or relabelling
of the push buttons on their home radio sets. Listen
to this sample advertisement produced by
the Radio Corporation of America a clever way to
get people to call their RCA serviceman!