built in signal converter in addition to the receiver. The equipment is capable of printing digital facsimile graphics, HF radioteletype, and CW decoded from International   Morse   Code   into   alphanumeric characters.   Other   than   tuning   the   proper   radio frequency  and  setting  the  AM/USB/LSB/FM  switch,  no additional  operator  inputs  are  necessary  to  print alphanumeric data, graphics, or imagery. For use ashore, an optional long-wire antenna or the whip antenna may be used. The long-wire antenna has two  very  long  lengths  ofreinforced  wire  extending  from a central connection point. Although this antenna receives signals very well, it must be lowered from its installed  location  and  tuned  by  shortening  or lengthening the two wires for each different frequency range. Frequency range markings are provided on each wire.   Detailed   instructions   are   provided   in   an instruction  booklet  supplied  with  each  long-wire antenna. Q45. Q46. Q47. Q48. Q49. Q50. Q51. Q52. REVIEW  QUESTIONS How is the Fleet Environmental Broadcast and AUTODIN traffic relayed to ships at sea? Which   NAVMETOC   regional   center   is responsible for the Sixth Fleet Environmental Broadcast? What  type  of  data  is  included  in  the  Fleet Environmental  Broadcast? Which   agency   maintains   high   frequency regional  broadcasts  (HFRB)? What  is  the  purpose  of  the  HF  facsimile broadcastfrom NAVMETOC regional centers? Which    publication    contains    listings    of frequencies   for   HF   RATT   and   facsimile transmissions? What level of HF frequencies should be copied at night? Which type of facsimile recorder is the most widely used by mobile environmental teams? SHIPBOARD HF RADIOS LEARNING  OBJECTIVES:  Identify the radio communications equipment routinely found in shipboard  weather  offices.  Discuss  the applications  and  use  procedures  for  this equipment. Aboard ship, weather observers may be tasked to operate special radio-receiving equipment to tune in local HF environmental broadcasts of alphanumeric or facsimile products. With the advent of TESS (3) and subsequent   advancements   in   communications technology, copying an HF radio broadcast with this equipment is rarely necessary. In this section, we discuss some basic terms that you must be familiar with, basic shipboard radio receiving equipment you might use, and the information systems that are used aboard ships to receive environmental information. The equipment you will use to receive I-IF radio transmissions aboard ship varies for the different types of   broadcasts.   Weather   personnel   are   primarily concerned   with   receiving   voice   broadcasts, Radioteletype  (RATT)  broadcasts,  and  facsimile broadcasts. To receive a radio voice broadcast, all you need is an antenna, a radio receiver, and a speaker. On most ships, these are all separate pieces of equipment. To copy a facsimile broadcast, you will need to patch the output from the radio receiver into a facsimile recorder. Finally, to receive a RATT broadcast, you will need to patch the output from the radio receiver into a signal converter, then patch the converter output into a teleprinter. Aboard ship, antenna patch panels and transfer switchboards are used to connect various pieces of equipment. HF ANTENNAS Aerographer’s Mates and Marine Corps observers use antennas both ashore and shipboard to receive HF radio  transmissions  of  weather  information  and  satellite broadcasts. Fortunately, many of the meteorological or oceanographic data reception systems in use have been simplified so that the antenna that is supplied with the system matches the frequencies desired. Aboard ship, antenna  usage  is  controlled  by  the  Radiomen  in  the communications spaces. Before attempting to tune in a 1-37