Assignment 4 



Communications, Office, and Specialized Meteorological Equipment 



Text: Pages 123 - 163 



4-1. 



4-2. 



4-3. 



Learning Objective: Identify 

 various communications media 

 used for the transmission of 

 weather data as to their 

 nomenclature, operating prin- 

 ciples, capabilities, and 

 maintenance procedures. 



What two means are used for the transmis- 

 sion of weather data? 



1. Radioteletype and radiotelegraphy 



2. Landline and radio 



3. Facsimile and radio 



4. Teletype and radio 



What two types of teletypewriters are 

 normally employed by weather units ashore? 



1. Model 28 R/0 and Model 40 Teletype- 

 writer 



2. Model 28 R/0 and Model 28 TT-48( ) /UG 



3. Model 40 Teletypewriter and Model 28 

 TT-48( )/UG 



4. Model 28 TT-48( ) /UG and Model 28 

 TT-69( )/UG 



What model teletypewriter is used to trans- 

 mit and receive weather data on the COMEDS 

 circuits? 



1. Model 28 R/0 



2. Model 40 Teletypewriter 



3. Model 28 TT-48( ) /UG 



4. Model 28 TT-69( )/UG 



4-5. Who is responsible for teletype maintenance 

 aboard ship? 



1. Aerographer ' s Mate 



2. Electricians 



3. Radiomen 



4. Ship's Servicemen 



4-6. By what principle does the Alden facsimile 

 develop transmitted data? 



1. Electrosensitivity 



2. Electrostatically 



3. By the Diazzo method 



4. Electromechanically 



4-7. The Alden recorder is designed to operate 

 at how many scans per minute? 



1. 30 or 60 



2. 60 or 90 



3. 60 or 120 



4. 90 or 120 



4-8. An exact facsimile scanned in the Alden 

 Facsimile Recorder is produced when the 

 surface of the electrosensitive paper is 

 plated by ions which leave the 



1. helix electrode when the photoelectric 

 cell picks up the image and converts 

 it into electrical impulses 



2. helix electrode when there is contact 

 between the loop and helix electrode 



3. loop electrode when the photoelectric 

 cell picks up the image and converts it 

 into electrical impulses 



4. loop electrode when there is contact 

 between the loop and helix electrode 



4-4. In regards to teletype maintenance, which 

 of the following is NOT a function of the 

 Aerographer ' s Mate? 



1. Changing paper 



2. Changing tape 



3. Changing ribbon 



4. Changing internal components 



4-9. Which control of the Alden Facsimile 



Recorder, when improperly set, will reduce 

 the distinctness of the chart features? 



1. White level 



2. Signal level 



3. Marking signal test 



4. Automatic gain control 



4-10. How far will the paper advance when the 

 Automatic Fast Feed switch is in the ON 

 position? 



1. 12 in. 



2. 8 in. 



3. 3 in. 



4. 6 in. 



22 



