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?
– 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?
What is the mode of emission used in VHF?
VHF CH 70 (156.525MHZ) – G2B