in many countries have been discontinued now that the GMDSS is
implemented) ;
RT (MF) services: Public Correspondence (PC) Radio Telephone
services on Medium Frequency (MF accessible using your Marine
SSB Radio);
RT (HF) services: Public Correspondence (PC) Radio Telephone
services on High Frequency (HF accessible using your Marine SSB
Radio);
VHF services: Public Correspondence (PC) services using your VHF
Marine Radio;
Telex services: PC services using your Marine SSB Radio, with TOR
(Telex Over Radio) equipment, or a computer running TOR software
(including radio e-mail software), connected to your SSB Radio;- DSC services: for Distress & Safety alerting; or to exchange initial
DSC calls prior to setting-up a link call.
The station frequency list(s) may also show: - Timeslfrequencies for transmitting 'Traffic Lists' - a list of ships for
whom the CRS holds link-call bookings/ telex messages from shore
subscribers. - Whether the station accepts AMVER reports/ship's weather reports,
etc.
PC RT Services - Example - Cape Town Radio (South Africa)
- RT(MF)
The Radio Telephone (RT) MF service is provided on 2182kHz only
(for distress, urgency and safety messages; announcing MSI
broadcasts; and traffic lists). The 2182kHz service is provided through
a number of (remotely-controlled) sites around the coast of South
Africa and is accessed using your Marine SSB Radio. Traffic Lists are
sent at 0003, 0603, 1015, 1403, and 1815VTC.
2.RT(HF)
The Radio Telephone (RT) service on High Frequency (HF) is also
accessed using your Marine SSB Radio. A number of working
channels (pairs of frequencies) are offered on each ' band', with the
'ITV Channel' number shown between the Transmit and Receive
Frequency. One Channel from each band (4MHz, 8MHz, 12MHz,
16MHz and 22MHz - but not 6MHz) is open 'H24' to receive calls -
remaining channels are 'working' channels (not listed here except
for Ch 403):
48 THE NAUTICAL INSTITUTE