CRC determines personal identification marks for all Bulgarian radio amateurs. They consist of the letters (national prefix) LZ and a number followed by two or three letters of the Latin alphabet (suffix). For Southern Bulgaria (first zone) the odd numbers 1, 3, 5, 7 and 9 are used, and for Northern Bulgaria (second zone) – the even numbers 2, 4, 6 and 8. For the suffix in the personal identification sign of club amateur radio stations, specifies a combination of three letters of the Latin alphabet from КАА to КZZ.
The KRS establishes temporary identification signs in connection with the celebration of significant dates, participation in international radio amateur competitions and expeditions, and the like. After the letters (national prefix) LZ, temporary identification marks may consist of one or more numbers and one or more letters.
When using the amateur radio station outside its permanent address, the radio amateur transmits after his identification mark under a fractional line:
- the number “1” for Southern Bulgaria (first zone) or the number “2” for Northern Bulgaria (second zone) – for temporary work from another inhabited place, if the radio station is powered by the electrical network of the temporary place of residence;
- the letter “P” or the word “portable” (for telephony) – for working with a mobile portable amateur radio station;
- the letter “M” or the word “mobile” (for telephony) – for work from a land vehicle;
- the letters “MM” or the words “marine mobile” (for telephony) – for work from aboard a vessel;
- the letters “AM” or the word “airmobile” (for telephony) – for work on board an aircraft;
- the requirements under item 3 are not mandatory when participating in radio amateur competitions.
Radio amateurs – foreigners with the status of temporary residents and making radio connections from the territory of the Republic of Bulgaria, form their identification mark by transmitting LZ and their personal identification mark under a decimal point.
Radio amateurs – foreigners residing and carrying out electronic communications from the territory of the Republic of Bulgaria for a period greater than one year, form their identification mark according to the above rules.
At the start and end of each amateur radio connection, the radio amateur transmits his identification mark, and during the radio connection indicates his location (locator and/or town).
When working on telephony, the international alphabet is used for phonetic correspondence.
Instead of this international phonetic alphabet, but admissible only for radio communication between Bulgarian radio amateurs, the phonetic correspondence table with the Bulgarian alphabet can be used.
The CRC defines identification marks for amateur repeaters and radio beacons. They consist of the letters (the national prefix) LZ and the number 0, followed by three letters of the Latin alphabet. Amateur repeaters and beacons transmit automatically (by telegraphy or telephony) their identification mark, locator, and altitude.
The CRC assigns identification marks MO, MOE, MOI, MOS, MOH, MO5 to amateur radio transmitters used for the sport of radio detection. Identification marks are transmitted automatically by telegraphy.
The commission sets personal listening marks for radio amateur listeners. They consist of the letters (the national prefix) LZ, a single digit, a dash and a three-digit serial number. The digit after LZ is formed according to the above rules.