8.5 Radio Telephone Flashcards
5 Basic Parts of a Transmission
- Transmitter
- Receiver
- Antenna
- Radio Set Control
- Transfer Switchboard
Two types of Radiotelephone (R/T) nets
- Directed/Controlled - Stations obtain permission from Net Control Station (NECOS) prior to communicating with other station on the net
- Free/Uncontrolled - Member stations do not need NECOS permission to transmit
R/T Net Security Types
Unsecure
Secure
Basics of Off-Ship Comms.
Think
Key
Speak
ELF, VLF, LF Band use
300Hz, 3-30kHz, 30-300kHz
Require high power, long antennas
Typicall limited to shore station uses
MF Band use
300kHz-3MHz
Limited military use due to commercial utilizing upper and lower MF bands
HF Band use
3-30MHz
Long-range shipboard comms (most common)
SATCOM as back-up in HF
VHF Band use
30-300MHz
Navigation
Amphib & Spec. Ops.
Short Range Line-of-sight (LOS) comms
SATCOM
UHF Band use
300MHz-3GHz
LOS and SATCOM
Mobile communications
RADAR (>400MHz)
Special Operations
SHF Band use
LOS
Terrestrial
Satellite relay links
RADAR
Special Operations
Four ways to monitor comm nets
- Guard
- Cover
- Copy
- Listen
Guard
Listening, Log Everything, Ready to Transmit
Cover
Listening, Log Everything, May not be ready to transmit
Copy
Listening, Log Everything, Not ready to transmit
Listen
Listening, Log only relevant to station, not ready to transmit
Beadwindow table
Contains Essential Elements of Friendly Information (EEFI)
