Part A - General
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Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.806(19) – Performance Standards for Shipborne MF/HF Radio Installations Capable of Voice Communication, Narrow-Band Direct Printing and Digital Selective Calling – (Adopted on 23 November 1995) - Annex - Performance Standards for Shipborne MF/HF Radio Installations Capable of Voice Communication, Narrow-Band Direct Printing and Digital Selective Calling - Part A - General

Part A - General

  1 Introduction

 The MF/HF radiotelephone, narrow-band direct printing and digital selective calling installation, in addition to meeting the requirements of the Radio Regulations, the relevant ITU-R Recommendations and the general requirements set out in Resolution A.694(17), should comply with the following performance standards.

  2 General

  2.1 The installation, which may consist of more than one piece of equipment, should be capable of operating on single-frequency channels or on single- and two-frequency channels.

  2.2 The equipment should provide for the following categories of calling, using both voice and digital selective calling (DSC):

  • .1 distress, urgency and safety;

  • .2 ship operational requirements; and

  • .3 public correspondence.

  2.3 The equipment should provide for the following categories of communications, using both voice and narrow-band direct printing (NBDP):

  • .1 distress, urgency and safety;

  • .2 ship operational requirements; and

  • .3 public correspondence.

  2.4 The equipment should comprise at least:

  • .1 a transmitter/receiver, including antenna(e);

  • .2 an integral control unit and/or one or more separate control units;

  • .3 a microphone with a press-to-transmit switch, which may be combined with a telephone in a handset;

  • .4 an internal or external loudspeaker;

  • .5 an integral or separate narrow-band direct printing facility;

  • .6 an integral or separate digital selective calling facility; and

  • .7 a dedicated DSC watchkeeping facility to maintain a continuous watch on distress channels only. Where a scanning receiver is employed to watch more than one DSC distress channel, all selected channels should be scanned within 2 s and the dwell time on each channel should be adequate to allow detection of the dot pattern which precedes each DSC call. The scan should only stop on detection of a 100 baud dot pattern.

  2.5 A distress alert should be activated only by means of a dedicated distress button. This button should not be any key of an ITU-T digital input panel or an ISO keyboard provided on the equipment.

  2.6 The dedicated distress button should:

  2.7 The distress alert initiation should require at least two independent actions.

  2.8 The equipment should indicate the status of the distress alert transmission.

  2.9 It should be possible to interrupt and initiate distress alerts at any time.

  3 Power Supply

 The MF/HF radio installation should be powered from the ship's main source of electrical energy. In addition, it should be possible to operate the MF/HF installation from an alternative source of electrical energy.

  4 Control

 It should be possible to conduct distress and safety communications from the position, or in the vicinity of the position, from which the ship is normally navigated.

Parent topic: Annex - Performance Standards for Shipborne MF/HF Radio Installations Capable of Voice Communication, Narrow-Band Direct Printing and Digital Selective Calling
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