Article 15(j) of the Convention on the International Maritime Organization concerning
the functions of the Assembly in relation to regulations and guidelines concerning
RECOGNIZING the need to prepare
performance standards for MF/HF radio installations capable of voice communication,
narrow-band direct printing and digital selective calling to ensure the operational
reliability of such equipment and to avoid, as far as practicable, adverse interaction
between such equipment and other communication and navigation equipment aboard ship,
HAVING CONSIDERED the recommendation made by the
Maritime Safety Committee at its fifty-fourth session,
1. ADOPTS the Recommendation on Performance Standards for MF/HF Radio
Installations Capable of Voice Communication, Narrow-Band Direct Printing and Digital
Selective Calling, the text of which is set out in the Annex to the present resolution;
2. RECOMMENDS Member Governments to ensure that
shipborne MF/HF radio installations capable of voice communication, narrow-band direct
printing and digital selective calling which will form part of the global maritime
distress and safety system conform to performance standards not inferior to those
specified in the Annex to the present resolution.
Annex Recommendation on performance standards for shipborne MF/HF radio installations capable of voice communication, narrow-band direct-printing and digital selective calling
Part A General
The MF/HF radiotelephone, narrow-band direct-printing and digital
selective calling installation, in addition to meeting the requirements of the Radio
Regulations, should comply with the following performance standards and with the
general requirements set out in Assembly resolution A.569(14).
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):
distress, urgency and safety;
.2 ship operational
.3 public correspondence.
2.3 The equipment should provide for the
following categories of communications using both voice and narrow-band direct
.1 distress, urgency and safety;
.2 ship operational requirements; and
.3 public correspondence.
The equipment should comprise at least:
transmitter/receiver, including antenna(e);
.2 an integral
control unit and/or one or more separate control units;
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
.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 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.
It should be possible to conduct distress and safety
communications from the position, or in the vicinity of the position, from which the
vessel is normally navigated.
Part B Transmitter
1. FREQUENCIES AND CLASSES OF EMISSION
1.1 The transmitter should be capable of
transmitting on all frequencies allocated to the maritime mobile service in the
frequency band 1,605 kHz to 27,500 kHz. As a minimum, the following frequencies
should be readily accessible to the operator: the voice frequencies 2,182, 4,125,
6,215, 8,291, 12,290 and 16,420 kHz; the NBDP frequencies 2,174.5, 4,177.5, 6,268,
8,376.5, 12,520 and 16,695 kHz; and the DSC frequencies 2,187.5, 4,207.5, 6,312,
8,414.5, 12,577 and 16,804.5 kHz.
Radiotelephone frequencies are designated in terms of the carrier frequency; NBDP
and DSC frequencies are designated in terms of the assigned (centre) frequency. When
NBDP and DSC signals are transmitted using a transmitter in the J2B mode the
(suppressed) carrier frequency should be adjusted so as to have the NBDP and the DSC
signal transmitted on the assigned frequency. The selected transmitter frequency
should be clearly identifiable on the control panel of the equipment.
1.3 .1 The transmitter should be capable of
transmitting (upper side band signals, where appropriate) using classes of emission
J3E, H3E and either J2B or F1B.
.2 When switching to the
preset distress frequency 2,182 kHz, the appropriate class of emission in accordance
with the Radio Regulations should be selected automatically. *
.3 When switching to the assigned (centre) frequencies for NBDP and DSC
specified in 1.1 above, classes of emission FIB or J2B should be selected
1.4 It should be
possible to change the transmitter from any class of emission to another for which
it is designed to operate by means of not more than one control.
1.5 It should be possible for the user to select
transmission frequencies independent of any receiver setting. This does not preclude
the use of transceivers.
1.6 It should be
possible to change the transmitter quickly from operation on any frequency to
operation on any other frequency, and in any event within a period not exceeding 15
s. The equipment should not be able to transmit during channel switching operations.
1.7 Means should be provided to prevent
ACCURACY AND STABILITY
The transmitted frequency should remain within 10 Hz of the
required frequency at all times following the warming-up period.
3 OUTPUT POWER
3.1 During normal modulation, the peak
envelope power in the case of J3E or H3E emissions, or the mean power in the case of
J2B or F1B emissions, should be at least 60W ** at any frequency within the
specified frequency range.
3.2 If the
rated output power exceeds 400W*** in the band, provision should be made for
reducing the output to 400 W or less. Generally, only the minimum power necessary
should be used for all radiocommunications.
PERMISSIBLE WARMING-UP PERIOD
The equipment should be capable of operation within 1 min after
Continuous operation should be possible when the transmitter is
adjusted to operate at its rated power.
CONTROLS AND INDICATORS
6.1 Provision should be made for
indicating the antenna current or power delivered to the antenna. Failure of the
indicating system should not interrupt the antenna circuit.
6.2 Manually tuned equipment should be fitted with a
sufficient number of indicators to permit accurate and rapid tuning.
6.3 Operation of the transmit/receive
control should not cause unwanted emissions.
6.4 All adjustment and controls necessary for switching the transmitter
to operate on 2,182 kHz and 2,187.5 kHz should be clearly marked in order that these
operations may be performed readily.
The equipment should be so designed and constructed that when the
transmitter is providing power to the antenna, the transmitter is protected against
damage resulting from disconnection of the antenna or short-circuiting of antenna
terminals. If this protection is provided by means of a safety device, that device
should automatically be reset following removal of the antenna open-circuit or
8 POWER SUPPLY
8.1 If it is necessary to delay the
application of voltage, for example anode voltage, to any part of the transmitter
after switching on, this delay should be provided automatically.
8.2 If the transmitter includes parts which are
required to be heated in order to operate correctly, for example crystal ovens, the
power supplies to the heating circuits should be so arranged that they can remain
operative when other supplies to or within the equipment are switched off. If a
special switch for the heating circuits is provided, its functions should be clearly
indicated; it shall normally be in the "on" position and be protected against
inadvertent operation. The correct operating temperature should be reached within a
period of 30 min after the application of power.
* For existing transmitters, during the transition and amortization period,
classes of emission may be selected manually.
** Note should be
taken that in some areas of the world a 60 W value may not be adequate to ensure
reliable communications. A value greater than 60 W may be required in these areas.
*** The Radio Regulations (RR 4357) specify a 400 W maximum
power for equipment operating in the MF band in region 1.
Part C Receivers
1 FREQUENCIES AND CLASSES OF EMISSION
1.1 The receiver should be capable of
being tuned throughout the bands between 1,605 kHz and 27.5 MHz. Tuning should be
either continuous, or by incremental steps, or by the selection of a number of spot
frequencies considered by the Administration as adequate for the operation of the
ship, or by any combination of these methods. As a minimum, the following
frequencies should be readily accessible to the operator: the carrier frequencies
2,182 4,125, 6,215 8,291, 12,290 and 16,420 kHz for radiotelephony; the NBDP
frequencies 2,174.5, 4,177.5, 6,268, 8,376.5, 12,520 and 16,695 kHz; and the DSC
frequencies 2,187.5, 4,207.5, 6,312, 8,414.5, 12,577 and 16,804.5 kHz.
1.2 Radiotelephone frequencies should be
designated in terms of the carrier frequency; NBDP and DSC frequencies should be
designated in terms of the assigned (centre) frequency. The selected receiver
frequency should be clearly identifiable on the control panel of the equipment.
1.3 The receiver should be capable of
receiving upper sideband signals as appropriate for classes of emission J3E, H3E,
J2B and F1B.
1.4 The class of emission
should be selectable by not more than one control.
1.5 It should be possible for the user to select reception
frequencies independent of any transmitter setting. This does not preclude the use
1.6 The receiver should
be capable of being tuned to different frequencies quickly, and in any event within
a period not exceeding 15 s.
STABILITY AND ACCURACY
The receiver frequency should at all times remain within 10 Hz of
the required frequency following the warming-up period.
3 USABLE SENSITIVITY
For classes of emission J3E and F1B the sensitivity of the
receiver should be equal to or better than 6 μV e.m.f. at the receiver input for a
signal-to-noise ratio of 20 dB. For NBDP and DSC an output character error rate of
10 -2 or less should be obtained for a signal-to-noise ratio of 12 dB.
4 RECEIVER OUTPUT
4.1 For the reception of voice signals,
the receiver should be suitable for use with a loudspeaker and a telephone handset
and should be capable of providing power of at least 2W to the loudspeaker and at
least 1 mW to the handset.
4.2 An output
should be provided for NBDP and DSC signals if the corresponding facility is not
5 PERMISSIBLE WARMING-UP
The equipment should be capable of operating within 1 min after
6 IMMUNITY TO INTERFERENCE
The immunity to interference of the receiver should be such that
the wanted signal is not seriously affected by unwanted signals.
The receiver should be provided with automatic gain control.
8 POWER SUPPLY
If the receiver includes parts which are required to be heated in
order to operate correctly, for example crystal ovens, the power supplies to the
heating circuits should be so arranged that they can remain operative when other
supplies to or within the equipment are switched off. If a special switch for the
heating circuits is provided, its function should be clearly indicated; it shall
normally be in the ''on" position and be protected against inadvertent operation.
The correct operating temperature should be reached within a period of 30 min after
the application of power.
Part D Digital selective calling facility
1 The facility should conform to the provisions of the
relevant CCIR Recommendations pertaining to the DSC system. *
2 The DSC facility should comprise:
.1 means to decode and encode DSC messages;
means necessary for composing the DSC message;
.3 means to
verify the prepared message before it is transmitted;
means to display the information contained in a received call in plain language;
.5 means for the manual entry of the position information;
additionally automatic entry may be provided; and
for the manual entry of the time at which the position was determined; additionally
automatic entry may be provided.
3.1 If the received messages are not
printed immediately, sufficient capacity should be provided to enable at least 20
received distress messages to be stored in the DSC facility.
3.2 These messages should be stored until read-out.
4 It should be possible to initiate and
make distress and safety calls from the position from which the ship is normally
navigated. The means for initiating a distress call should be easy to operate and
protected against inadvertent activation.
5 Initiation of the DSC distress calls should supersede any other
operation of the facility.
Self-identification data should be stored in the DSC unit. It should not be possible
for the user easily to change these data.
7 Means should be provided to enable routine testing of the DSC
facilities without radiation of signals.
8 Provision should be made for a specific aural alarm and visual
indication to indicate receipt of a distress or urgency call or a call having a
distress category. It should not be possible to disable this alarm and indication.
Provision should be made to ensure that they can be reset only manually.
* Class A DSC equipment conforming to CCIR Recommendation 493 should be used to
meet this requirement.
Part E Narrow-band direct-printing (NBDP) facility
1 The facility should conform to the relevant CCIR
Recommendations pertaining to the NBDP system *. It should provide for the use of
maritime mobile service identities in accordance with appendix 43 of the ITU Radio
Regulations. The facility should be capable of operating in the FEC and ARQ modes on
the single-frequency channels allocated for distress NBDP operation .
2 Self-identification data should be stored
in the NBDP unit. It should not be possible for the user easily to change these
3 The NBDP facility should
.1 means to decode and encode messages;
.2 means for composing and verifying messages to be
.3 means for providing a record of
* NBDP equipment conforming to CCIR Recommendation 476 may be used until the cost
is amortized. It is recommended that newly installed NBDP equipment should conform
to CCIR Recommendation 625.