What are the modes of Emission in GMDSS?

Modes of Emission in GMDSS

In this topic, we will learn how to identify which modes of emission are used on which GMDSS equipment and what do they mean. For Example, what is J3E, G2B, OR F1B?

J3E

First character J indicates it is Amplitude modulation.

– Second character 3 indicates it is Analog Information.

– Third character E indicates it is a Telephone.

The first character of emission indicates the type of modulation used

If it is J, H, A, or R = Amplitude modulation

IF it is F = Frequency Modulation

If it is G = Phase modulation

The Second character of emission indicates the type of Information

If it is 1 = Digital Information without modulating carrier.

IF it is 2 = Digital Information with modulating carrier.

If it is 3 = Analog Information

The third character of emission if it A, B, or E indicates

If it is A = Telegraphy for manual reception

IF it is B = Telegraphy for automatic reception.

If it is E = Telephone

What is the mode of emission used in Navtex?

F1B

What is the mode of emission used in VHF?

VHF CH 16 (156.800MHZ) – G3E or F3E
VHF CH 70 (156.525MHZ) – G2B

What is the mode of emission used in Telex NBDP?

F1B

What is the mode of emission used in DSC VHF, MF-HF Radio Telephone?

J3E

What is the mode of emission used in MF-HF DSC Distress, Urgency, Safety alert?

J2B

What is the mode of emission used in EPIRB?

G1B

To Read About EPIRB In Detail Click Here

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