Channels and Frequencies
I would be grateful for any help understanding the division of the R/T spectrum into chanels/8.33 subdivisions:
With increasing congestion in the aviation VHF band I understand that the 25 kilohertz spaced spectrum of 'Frequencies' has been further subdivided into 8.33 kHz subdivisions referred to as 'Channels'. Starting at the bottom of the Aviation R/T spectrum the steps run:
'Frequencies' 'Channels'
118.000
..................118.005 118.010 118.015
118.025
..................118.030 118.035 118.040
118.050
and so on.
Two questions arise:
1. The frequency assigned to each 'Channel' does not seem to be at a numerical spacing of 8.33 kHz, so am I right in thinking that the frequency quoted is merely a channel designation rather than the actual numerical value of the frequency used for that 'Channel'?
2. 'Frequencies' are spaced at 25 kHz, and 3 x 8.33 = 25, which seems to imply that there should be room for 2 'Channels' between each 'Frequency', so why do there seem to be 3 'Channels' (see table above) between each 'Frequency'?
Thanks in advance
Exfiller