thejim wrote:
Can someone explain me what do we mean by the term frequency pairing?
I met the term in an avionics book.The phrase is the following;
The DME interrogation and reply frequency are paired with VOR
frequency.
Thank you



VOR's are in the VHF band (108-118 mHz approx)
DME's are in the UHF band (up in the 400's mHZ)

When you tune a DME, the VHF frequency you enter on the device (or have
channeled to it from the nav) is a paired frequency, established years
ago by international convention.


Dave