Annex 2 - Recommendation on Performance Standards for Two-Way VHF Radiotelephone Apparatus for Fixed Installation in Survival Craft
Clasification Society 2023 - Version 9.38
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.809(19) Performance Standards for Survival Craft Two-Way VHF Radiotelephone Apparatus (Adopted on 23 November 1995) - Annex 2 - Recommendation on Performance Standards for Two-Way VHF Radiotelephone Apparatus for Fixed Installation in Survival Craft

Annex 2 - Recommendation on Performance Standards for Two-Way VHF Radiotelephone Apparatus for Fixed Installation in Survival Craft

  1 Introduction

 The survival craft two-way VHF radiotelephone for fixed installations, 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 equipment should be capable of being used for on-scene communication between survival craft, between survival craft and ship and between survival craft and rescue unit.

  2.2 The equipment should comprise at least:

  • .1 a transmitter and receiver;

  • .2 an antenna which may be fixed to the equipment or mounted separately; and

  • .3 a microphone with a press-to-talk switch and a loudspeaker.

  2.3 The equipment should:

  • .1 be capable of being operated by unskilled personnel;

  • .2 be capable of being operated by personnel wearing gloves as specified for immersion suits in Regulation III/33 of SOLAS 1974;

  • .3 withstand such shocks and vibration as may occur in survival craft;

  • .4 be watertight to a depth of 1 m for at least 5 min;

  • .5 maintain watertightness when subjected to a thermal shock of 45C under conditions of immersion;

  • .6 not be unduly affected by seawater, or oil, or both;

  • .7 have no sharp projections which could injure personnel;

  • .8 be capable of operating in the ambient noise level likely to be encountered in survival craft; and

  • .9 be so designed that it can be readily mounted in a survival craft.

  3 Class of Emission, Frequency Bands and Channels

  3.1 The two-way radiotelephone should be capable of operation on the frequency 156.800 MHz (VHF channel 16) and on at least one additional channel.

  3.2 All channels fitted should be for single-frequency voice communication only.

  3.3 The class of emission should comply with appendix 19 of the Radio Regulations.

  4 Controls and Indicators

  4.1 An on/off switch should be provided with a positive visual indication that the radiotelephone is switched on.

  4.2 The receiver should be provided with a manual volume control by which the audio output of the loudspeaker may be varied. Where a handset is provided, this manual volume control of the loudspeaker should not influence the audio output of the handset.

  4.3 A squelch (mute) control and a channel selection switch should be provided.

  4.4 Channel selection should be easily performed and the channels should be clearly discernible.

  4.5 Channel indication should be in accordance with appendix 18 of the Radio Regulations.

  4.6 It should be possible to determine that channel 16 has been selected in all ambient light conditions.

  5 Permissible Warming-up Period

 The equipment should be operational within 5 s of switching on.

  6 Safety Precautions

 The equipment should not be damaged by the effects of open-circuiting or short-circuiting the antenna.

  7 Transmitter Power

 The RF output power should be a minimum of 0.25 W. Where the RF output power exceeds 1 W a power reduction switch to reduce the output power to 1 W or less is required.

  8 Receiver Parameters

  8.1 The sensitivity of the receiver should be equal to or better than 2 μV e.m.f. for a SINAD ratio of 12 dB at the output.

  8.2 The immunity to interference of the receiver should be such that the wanted signal is not seriously affected by unwanted signals.

  9 Antenna

 The antenna should be vertically polarized and, as far as practicable, be omnidirectional in the horizontal plane. The antenna should be suitable for efficient radiation and reception of signals at the operating frequency.

  10 Receiver Output

  10.1 The audio output should be sufficient to be heard in the ambient noise level likely to be encountered in survival craft.

  10.2 In the transmit condition, the output of the receiver should be muted.

  11 Environmental Conditions

 The equipment should be so designed as to operate over the temperature range -20C to +55C. It should not be damaged in stowage throughout the temperature range -30C to +70C.

  12 Power Supply

  12.1 The source of energy may be integrated in the equipment or external to it.

  12.2 The source of energy should have sufficient capacity to ensure 8-hour operation at its highest rated power with a duty cycle of 1:9. This duty cycle is defined as 6-second transmission, 6-second reception above squelch opening level and 48-second reception below squelch opening level.

  12.3 The two-way radiotelephone equipment may be equipped with a primary or secondary battery. Primary batteries should have a shelf life of at least two years.

  12.4 Where secondary batteries are used, suitable arrangements should be made to ensure the availability of fully charged cells at all times.

  13 Labelling

 In addition to the general requirements specified in Resolution A.694(17), the following should be clearly indicated on the exterior of the equipment:

  • .1 brief operating instructions; and

  • .2 expiry date for the primary batteries, if any.


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