Experimental calls without K/W prefixes[]
These call letters were assigned in the early days of broadcasting, when broadcasts were considered experimental services. The same type of call was also assigned to amateur radio operators, except without the X or Y in the second character position (see next section). In later years, similar calls were issued with the standard K and W prefixes.
1XE | 1XZ | 2XB | 5YM | 6XAC | 6XAG | 6XAJ | 6XAM | 6XC | 6XD | 6XG | 7XC | 7XG | 8MK | 8XB | 8ZU | 8ZZ | 9AXJ | 9YA | 9YI | 9YK
Regular amateur calls without K/W prefixes[]
These stations were licensed as regular amateur stations, but eventually became commercial broadcasters.
Calls using A prefixes[]
These were issued only to United States Government stations, mainly military. Most such stations were not intended as broadcasters to the general public, but this section lists stations which might have been exceptions to that rule.
Calls using N prefixes[]
These were issued only to United States Government stations, mainly Navy. Most such stations were not intended as broadcasters to the general public, but this section lists exceptions to that rule.
See also[]
3- and 4-letter K calls[]
KA | KB | KC | KD | KE | KF | KG | KH | KI | KJ | KK | KL | KM | KN | KO | KP | KQ | KR | KS | KT | KU | KV | KW | KX | KY | KZ
3- and 4-letter W calls[]
WA | WB | WC | WD | WE | WF | WG | WH | WI | WJ | WK | WL | WM | WN | WO | WP | WQ | WR | WS | WT | WU | WV | WW | WX | WY | WZ