402 Frequencies Flashcards
Match Up 121.5 123.1 156.8 243.0 4125+6215
- IAER
- SAR
- Maritime VHF Telephone
- Emergency
- Safety
121.5-IAER
123.1-SAR
156.8- Maritime VHF Telephone
243.0-Emergency
4125+6215-Safety
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?
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”
Three parts of an Antenna?
Coupling device, Feeder and Antenna
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)
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
Order of K,M,G in the VLF, LF, MF, HF, VHF, UHF, SHF and EHF frequency range?
K
M
G
Transmission rates of T Lines?
T1-1.5 Mbps
T2-6.3
T3-46
T4-281
