FM Immunity questions
This little subject has been causing a fair degree of amusement to us military folk of late given that we can we no longer do ILS or VOR approaches (or SIDs and STARs) as our nav kit is non-compliant (NDBs all round then!).
What I've been wondering (and hoping one of you tech-minded folk could explain) is why an increase in the upper limit of FM sound broadcast range from 105.0 to 107.9 MHz means that all aeronautical nav/comms frequencies in the band 108.0 - 137.0 might be affected and require filtering. Why should an increase in broadcasting over 2.9 MHz affect the next 29 MHz?
Along the same lines, ish, as we're going to be doing a fair NDBs over the coming months, what is the status of these navaids? I know they're all maintained as published but were there not moves to get rid of the things recently?
Finally then, I assume I am right in thinking that all you civilian folk all now have fully compliant kit?