PPRuNe Forums - View Single Post - What Frequency is Guard?

11th Nov 2003, 20:06

#11 (permalink)

The Bullwinkle

Join Date: Sep 2002

Location: Australia

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But do you know why 121.5 is used????

Well I'm glad you asked.

Because Civil aviation use VHF and Military use UHF, any distress messages transmitted on VHF 121.5 can also be heard on the military distress frequency UHF 243.0 and vice versa.