Frequencies

Question 1

Match Up 
121.5
123.1
156.8 
243.0
4125+6215

• IAER
• SAR
• Maritime VHF Telephone
• Emergency
• Safety

Answer 1

121.5-IAER
123.1-SAR
156.8- Maritime VHF Telephone
243.0-Emergency
4125+6215-Safety

Question 2

Match up

• Ionosphere
• Stratosphere
• Troposphere
• Little temp change or effect on radio waves
• Point to point communications
• The weather section of the atmosphere. Extends from Earth about 3.7 miles.

What is Sudden Ionic Disturbance?

Answer 2

Ionosphere-“pOInt to pOInt communications”

Stratosphere-Little temp change or effect on radio waves

Troposphere-The weather section of the atmosphere. Extends from Earth about 3.7 miles.

Sudden Ionic Disturbance-
-Long Distance Propogation
of HF radio, causes ‘blank out”

Question 3

Three parts of an Antenna?

Answer 3

Coupling device, Feeder and Antenna

Question 4

Years

Radio Message
-First Naval Radio Message(ship to shore)

Telephone and Receivers

• First telephone between ships
• First superheterodyne receivers installed in the fleet

Teletypewriter and Radiophoto

• First successful radio teletypewriter
• First successful use of radiophoto(facsimile)

Answer 4

Years
1800s-First Naval Radio Message(ship to shore)-1899

1910s-First telephone between ships-1916
30s-First superheterodyne receivers installed in the fleet-1931

40s-First successful radio teletypewriter-1944
40s-First successful use of radiophoto(facsimile)-1945

Question 5

Order of K,M,G in the VLF, LF, MF, HF, VHF, UHF, SHF and EHF frequency range?

Answer 5

K
M
G

Question 6

Transmission rates of T Lines?

Answer 6

T1-1.5 Mbps
T2-6.3
T3-46
T4-281