§  23.37   Station identification.

   (a) General. Every radiotelegraph or radiotelephone station in the
   International Fixed Public or Fixed Public Press Service shall
   transmit, as provided below, the identifying call sign or other
   approved identification signal on each of its assigned frequencies
   below 30 MHz on which energy is being radiated.

   (b) When required. (1) The call sign assigned to each frequency shall
   be transmitted on that frequency at the beginning and end of each
   period of use of the frequency.

   (2) During regular operation on any freuency, the call sign or other
   approved identification signal shall be transmitted at least at hourly
   intervals within the period from 10 minutes before to 10 minutes after
   each hour. If identification during this period would require an
   interruption in the transmission of a radio-photo, a telephone
   conversation, an addressed program or a multiple addressed press
   message, or a break in the continuity of a “conference” or “leased
   line” type of service, the identifying signal shall be transmitted at
   the first break in, at the conclusion of, or simultaneously with, the
   particular transmission as described below.

   (c) Methods of transmission. (1) All identifying signals shall be
   transmitted in such a manner as to permit identification without
   special equipment other than communication type receivers, except as
   provided in paragraph (e) of this section. When emissions are being
   used which are not capable of identification without special equipment,
   the identifying signal shall be transmitted by one of the following
   methods:

   (i) By interrupting the transmission and transmitting the call sign in
   a manner which can be identified without special equipment.

   (ii) By superimposing the call sign or other approved identification
   signal on the emission being transmitted without interrupting the
   transmission as provided for by paragraphs (e) and (f) of this section.

   (d) Emissions to be used. (1) Except as otherwise provided, the
   following emissions shall be used for identification:

   (i) Radiotelegraph stations. The identifying call sign shall be
   transmitted by International Morse code at a speed not to exceed 25
   words per minute and shall consist of the signal “QRA de” followed by
   the call sign. This transmission shall be made at least three times.

   (ii) Radiotelegraph stations using telephone type emissions. When
   telephone type emissions are being used in accordance with § 23.11,
   identification may be made by voice and shall consist of announcing
   three times in English the call sign of the frequency being used

   (iii) Radiotelephone stations. The identifying transmission may be made
   utilizing either telegraph or telephone type emissions. When telegraph
   emission is used, the transmission shall be made in International Morse
   Code at a speed not to exceed 25 words per minute and shall consist of
   the signal “QRA de” followed by the call sign. This transmission shall
   be made at least three times. When telephone emission is used, the
   identification shall consist of announcing three times in English the
   call sign of the frequency being used, provided that all privacy or
   secrecy devices shall be removed from the circuit during such
   transmissions.

   (e) Superimposed identification. Radiotelegraph or radiotelephone
   stations identifying simultaneously with transmission of traffic: call
   signs or the general identification signal described in paragraph (f)
   of this section may be superimposed on the emission being transmitted
   by any method which will make identification possible with
   communication type receivers provided that approval of any such method
   shall first have been obtained from the Federal Communications
   Commission. (Approval by the Federal Communications Commission of any
   means of identification of complex emissions by superimposing
   identification of regular transmissions will be given upon satisfactory
   completion of coordinated tests thereof by the applicant and the
   Commission's Field Engineering Bureau.) Commission approval may be
   withdrawn if at any subsequent time harmful interference to adjacent
   frequencies is caused by the superimposed identification. When
   superimposed identification by call sign is used, the identifying
   signal shall consist of “QTT de (call sign)” transmitted at least three
   times in International Morse Code at a speed not to exceed 25 words per
   minute.

   (f) General identification signal. When an approved method of
   superimposed identification is used, the identification signal shall
   consist of “QTT de (abbreviated name of company recorded with the
   Commission) (abbreviated name of station recorded with the
   Commission).” (It is suggested that “abbreviated company name” consist
   of two to five letters such as the initials of the company name and
   that “abbreviated name of station” consist of two or three letters
   indicating the name of the city where the licensee's message center is
   located. Both of these abbreviations shall be notified to the
   Commission before being used for identification.) This general
   identification signal shall be transmitted in International Morse Code
   at a speed not to exceed 25 words per minute and may be transmitted
   continuously or intermittently as desired provided that it shall be
   transmitted for at least five minutes total time during the period from
   10 minutes before to 10 minutes after each hour that energy is being
   radiated on the frequency. The same signal may be superimposed on all
   transmissions being made at a particular station: Provided, however,
   That licensed call signs shall be transmitted on the frequencies to
   which they are assigned as often as is practicable and reasonable or at
   least at the beginning and end of each period of use of each frequency.

   (g) Identification by printer. Notwithstanding the other provisions of
   this section with respect to methods of transmission, when single
   channel start-stop 5 unit code printer equipment is being used, the
   identifying call sign may be transmitted by means of printer signals.
   When identification is made by printer signals, it shall consist of the
   call sign for the particular frequency being used and shall be made at
   least three times at a speed of approximately 60 words per minute.