Sycamore/ LeCerc
Just as well you didn't limit yourself by 'saying it only once' several times.
Dbate, your formulae is more like the data I remember, but it's not as comprehensive as Sycamore/LeCerc's data.
So now by combining the two, I have;
X Channels;
1 to 16 plus 134.3
17 to 59 plus 106.3
60 to 69 plus 127.3
70 to 126 plus 105.3
Y Channels
17 to 59 plus 106.35
70 to 126 plus 105.35
Maybe I'll get the chance to tune a TACAN in this week and find out if it works !