FANDOM


This table shows the changes in the AM band frequency allocations up to November 11, 1928. For a description, see List of United States AM frequency allocations.

Kilohertz => 500 540 550 619 666 750 833 870 990 1000 1050 1060 1070 1350 1365 1500 >1500
Meters ==> 600   485 450 400 360  300   220 200 <200
Mid-1921 Ship Relay Ship   Ship Amateur 
Dec. 1, 1921 Ship Market
&
Weather
Relay Entertainment Ship Ship Amateur
Late Sep 1922 Ship Market
&
Weather
Relay B A Ship Ship Amateur
May 15, 1923 Ship ===Class B==== C Class B Ship =====Class A===== Amateur
Nov. 1924 Ship ===Class B==== C ==Class B== ==========Class A========== Amateur
April 1925 Ship ===============Class B=============== ======Class A====== Amateur
7/1926-3/1927   Ship Anarchy Amateur
Nov. 11, 1928 Ship   FRC Reorganized Band:
rrrrrrrrruuuuucuuucuuuuruuuuucuuurrcrrrrcuuuurucuuuuuuuuruuuuuuuLLrrrrrrrrrLrrrrrLrrrrLrrrRRRRL
 
 


Graphical representation of the 96 frequency assignments, from 550 to 1500 kilohertz, under the November 11, 1928 plan.

Regional (40) r
U.S. Clear (40) u
Canadian-only (6) c
Local (6) L
High-power Regional (4) R

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