TIÊU CHUẨN CHO VHF CẦM TAY
PERFORMANCE STANDARDS FOR SURVIVAL CRAFT PORTABLE TWO-WAY VHF RADIOTELEPHONE APPARATUS
MSC.515(105)
1 INTRODUCTION
The survival craft portable two-way VHF radiotelephone apparatus, 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 portable and capable of being used for on-scene communication between survival craft, between survival craft and ship and between survival craft and rescue unit. It may also be used for onboard communications when capable of operating on appropriate frequencies.
2.2 The equipment should comprise at least: .1 an integral transmitter/receiver including antenna and battery; .2 an integral control unit including a press-to-transmit switch; and .3 an internal microphone and 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 SOLAS regulation III/32.3; .3 be capable of single-handed operation except for channel selection; .4 withstand drops on to a hard surface from a height of 1 m; .5 be watertight to a depth of 1 m for at least five minutes; .6 maintain watertightness when subjected to a thermal shock of 45°C under conditions of immersion; .7 not be unduly affected by seawater, or oil, or both; .8 have no sharp projections which could damage survival craft; .9 be of small size and light weight; 10 be capable of operating in the ambient noise level likely to be encountered on board ships or in survival craft;
.11 have provisions for its attachment to the clothing of the user and also be provided with a wrist or neck strap. For safety reasons, the strap should include a suitable weak link to prevent the bearer from being ensnared; .12 be resistant to deterioration by prolonged exposure to sunlight; and .13 be either of a highly visible yellow/orange colour or marked with a surrounding yellow/orange marking strip.
3 CLASS OF EMISSION, FREQUENCY BANDS AND CHANNELS
3.1 The two-way VHF radiotelephone apparatus 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 Recommendation ITU-R M.489-2.
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 may be varied.
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 five seconds 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 effective radiated power should be a minimum of 0.25 W. Where the effective radiated power exceeds 1 W, a power reduction switch to reduce the power to 1 W or less is required. When this equipment provides for onboard communications, the output power should not exceed 1 W on these frequencies.
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 on board ships or in a 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 -20°C to +55°C. It should not be damaged in stowage throughout the temperature range -30°C to +70°C.
12 POWER SUPPLY
12.1 The source of energy should be integrated in the equipment and may be replaceable by the user. In addition, provision may be made to operate the equipment using an external source of electrical energy.
12.2 Equipment for which the source of energy is intended to be user-replaceable should be provided with a dedicated primary battery for use in the event of a distress situation. This battery should be equipped with a non-replaceable seal to indicate that it has not been used.
12.3 Equipment for which the source of energy is intended to be non-user-replaceable should be provided with a primary battery. The portable two-way radiotelephone equipment should be fitted with a non-replaceable seal to indicate that it has not been used.
12.4 The primary battery 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.
12.5 Primary batteries should have a shelf life of at least two years, and if identified to be user-replaceable should be of a colour or marking as defined in 2.3.13.
12.6 Batteries not intended for use in the event of a distress situation should be of a colour or marking such that they cannot be confused with batteries intended for such use.
13 LABELLING AND MARKING
13.1 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; .2 expiry date for the primary batteries; and .3 original equipment manufacturer.
13.2 The expiry date of the primary battery should use the date of manufacture of the cells within the battery as its starting point and be calculated as follows: expiry date = date of manufacture + shelf life, where: .1 the shelf life is the period after which a battery that has not yet been used (i.e. seal unbroken) can still be installed and meet its rated “service life”. This is determined by the original equipment manufacturer, taking into consideration the losses incurred during storage at the ambient environmental conditions defined in IEC 60945; and .2 the service life is the period for which the battery is operational after its use has been initiated by switching on the radio in accordance with 12.4.
13.3 The original equipment manufacturer should, in original and indelible print, clearly mark the date of manufacture and expiry date such that it is visible on the exterior of the equipment. The label and its printed data should meet the relevant environmental clauses of IEC 60945, “Table 3. Durability and resistance to environmental conditions for portable equipment”.
13.4 The battery should also display a warning that a broken non-replaceable seal will cause the indicated expiry date to be void.
Link — https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.515(105).pdf
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