7-A-080: MF-HF: Frequencies: Simplex, Duplex & Half-duplex
7-80J1:
How are paired NBDP frequencies normally used?
These are normally used for ARQ communications with coast radio stations.
These are normally used for FEC communications with coast radio stations.
These are normally used only for Distress communications to limit channel interference.
These are normally used for DSC communications with coast radio stations.
7-80J2:
How are paired SSB frequencies normally used?
These are normally used for J3E communications with coast radio stations.
These are normally used for FEC communications with coast radio stations.
These are normally used for ARQ communications with coast radio stations.
These are normally used for DSC communications with coast radio stations.
7-80J3:
For general communications purposes, paired frequencies are:
Normally used with public coast stations.
Normally used with private coast stations.
Normally used between ship stations.
Normally used between private coast and ship stations.
7-80J4:
For general communications purposes, simplex frequencies are:
Both a) and c) are correct.
Normally used between ship stations and private coast stations.
Normally used with public coast stations.
Normally used between ship stations.
7-80J5:
An ITU simplex channel frequency assignment is defined as:
Transmit and receive frequencies must be identical.
Transmit and receive frequencies must be different.
Transmit and receive frequencies may be different, depending on whether communications are ship-shore or ship to ship.
Transmit and receive frequencies are different regardless of emission mode.
7-80J6:
An ITU duplex channel frequency is defined as:
Transmit and receive frequencies must be different.
Transmit and receive frequencies may be identical if communications are ship-shore.
Transmit and receive frequencies must be identical.
Transmit and receive frequencies may be different if communications are ship-ship.
|
Color key:
|
|
● = Unseen
|
|
● = Weak
|
|
● = Review
|
|
● = Learned
|
|
● = Incorrect answer
|
