T-45A UJPT & E2-C2 INav-03
Use and Operation of TACAN, VOR, VOR/DME
7. Most can be used to transmit voice communications to aircraft as
well as scheduled and/or urgent weather information. An example
is Hazardous In-flight Weather Advisory Service/HIWAS, a
program for broadcasting hazardous weather information
(Significant Meteorological Information, convective Significant
Meteorological Information, Center Weather Advisories, Airman’s
Meteorological Information, Severe Weather Forecast Alerts, and
urgent Pilot Weather Reports) on a continuous basis over selected
VORs.
8. There is a negligible “cone of confusion” over a VOR antenna.
Fig 4: Cones of
Due to its size, station passage over a VOR is a recognized fix.
Confusion
Therefore, “over the station holding” can be conducted directly over
a VOR station.
C. VOR/DME
NOTE: The acronym VORTAC describes a facility in which a VOR and
a TACAN station are collocated. Operating characteristics are the
same as VOR/DME.
1. Same as VOR plus DME information
2. Differences from TACAN
a. Frequency band
(1) TACAN: 1025-1150 MHz, UHF (252 channels, X and Y)
(2) VOR/DME: 108.0-117.95 MHz, VHF (channel designator
for DME only)
b. Range data
(1) TACAN: DME a component of system
(2) VOR/DME: DME separate system providing range only
NOTE: DME information for the T-45A can only be
received on the TACAN. The aircraft’s VOR receiver
configuration does not include DME capability.
c.
Identifier
(1) TACAN: Morse code only
(2) VOR/DME: Morse code and possibly voice
Page 3-9
(6-99) Original
Previous Page
