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As stated on the page on assignments of FM station call letters, a new call-letter plan was adopted in 1941 that was intended to be systematic; first a K or W, then two digits representing the frequency, then one or two letters representing the location. Frequencies at the time were in the range of 43 to 49 MHz, and the two-digit frequency code was obtained by dropping the "4" and the decimal point; thus W81SP was on 48.1 MHz in Springfield, Massachusetts. This 1941 systematic call letter scheme lasted only until November 1, 1943, at which time the call letters were normalized to a similar scheme to the AM broadcast calls, except for some experimental-type calls.

The following table shows the changes made at that time (details on the individual stations can be obtained by linking to the individual stations' chronology pages):

Old call letters New call letters
K45LA
K47SL
K49KC
W31NY
W39B WMTW
W39NY
W41MM
W43B WGTR
W45BR
W45CM
W45D
W45RG
W45V
W47A
W47C
W47NV
W47NY
W47P
W47PH
W49B
W49BN
W49D
W49FW
W49PH
W51C
W51NY
W51R
W53H
W53PH WFIL-FM
W55M
W55NY
W57A
W57PH
W59C
W59NY WQXQ
W63C
W63NY
W63SY
W65H WDRC-FM
W67B
W67C
W67NY WABC-FM
W69PH WCAU-FM
W71NY WOR-FM
W71RF
W71SB
W73PH WPEN-FM
W75C
W75NY WABF
W75P
W81SP
W85A

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