Tacan

[Engineer]

TACAN has 126 X and 126 Y channels. Normally only X channels
are used, unless crowded. TACAN frequencies are tied to VOR frequencies. (Note: there are more TACAN frequencies than VOR frequencies, some are blanked around the ATCRBS Beacon frequencies, and others are for expansion and military use).

Frequency pairings as follows

Channel VOR
-------------------
17X 108.00 MHz
17Y 108.05 MHz
18X 108.10 MHz
18Y 108.15 MHz
19X 108.20 MHz
19Y 108.25 MHz
and at 50Khz spacing
upto
58X 112.10 MHz
58Y 112.15 MHz
59X 112.20 MHz
59Y 112.25 MHz
. . . (Unused to protect Beacon)
70X 112.30 MHz
70Y 112.35 MHz (Unused to protect Beacon)

126X 117.90
126Y 117.95 (Last VOR pairing)

29Y and 92Y Favorites for Military Air Refueling (Air-Air)
Check the heavens if active. All Air-Air pairs are 63 Y apart.