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These call signs start with the letters K, N or W, followed by a single numeral from 0 to 9 then followed by a single letter from A through W, Y or Z. The letter X is not allowed as it is reserved for experimental stations. Thus, there are 750 such call signs available. [30] Each call sign may be used for 15 days from its issue.
Call signs almost always have one of the following forms: PNS, 1×1 call sign usually for a special event, the prefix is always a single letter character, as is the suffix. Can only be assigned in the B, F, G, I, K, M, N, R, or W prefix range. (See discussion on the D9K call sign issued by Korea above – 'when 2 characters are needed'.)
The rules governing call signs for stations in the United States are set out in the FCC rules, 47 C.F.R. chapter I. Specific rules for each particular service are set out in the part of the rules dealing with that service. A general overview of call sign formats is found at 47 CFR 2.302.
RFinder's main service is the World Wide Repeater Directory (WWRD), which is a directory of amateur radio repeaters. RFinder is the official repeater directory of several amateur radio associations. RFinder has listings for several amateur radio modes , including FM , D-STAR , DMR , and ATV .
Map showing the numeral codes for amateur radio call signs in the United States. The region in which the operator was licensed determines the numeral. United States amateur radio call signs consist of one or two letters, followed by a single digit, and closing with one to three more letters. [20]
An amateur radio operator uses a call sign on the air to legally identify the operator or station. [52] In some countries, the call sign assigned to the station must always be used, whereas in other countries, the call sign of either the operator or the station may be used. [ 53 ]
An SSTV repeater is an amateur radio repeater station that relays slow-scan television signals. A typical SSTV repeater is equipped with a HF or VHF transceiver and a computer with a sound card, which serves as a demodulator/modulator of SSTV signals. SSTV repeaters are used by amateur radio operators for exchanging pictures.
An American or Canadian amateur may allow third party use of his station and call sign, carry international third party traffic, serve as a temporary control operator for a repeater station, and identify themselves as a domestic station using the national call sign system, provided: [16] [5]