T-45C TS, ADV & IUT ENG-21
CNI System
II.
Controls and operational characteristics--communication
Sg 2, fr 2
system 1.4.18.2.1
Lesson Organization
A.
COMM 1/COMM 2 radio system: The UHF/VHF comm
CNI SYSTEM
radio system provides air-to-air and air-to-ground
* Major CNI components
communications. The system consists of two remote
* Controls and operational
characteristics--communication
receiver transmitters (RT) (COMM 1, COMM 2), four
system
radio control panels (two in each cockpit) and two UHF/
* Controls and operational
characteristics--navigation
system
VHF antennas.
* Antenna locations (CNI)
1.
UHF/VHF control panels
Sg 2, fr 3
UHF/VHF Control
a.
Controls operation of remote RT
Panel
b.
Allows pilots to select operational frequencies of
AM and FM signals in UHF and VHF bands
VHF
UHF
Sg 2, fr 4
Fig 9: Frequency
Bands
4 0 .5 M H z
1 2 1 .5 M H z
1 5 6 .8 M H z
2 4 3 .0 M H z
GUARD
GUARD
G UARD
G UARD
AM - FM
AM O NLY
FM O NLY
R E C E IV E O N L Y
FM O N LY
Figure 9: FREQUENCY BANDS
(1) UHF frequency range: 225.0 to 399.975
MHz; commonly used in military aviation for
communications
(2) VHF frequency range: 30.0 to 173.975
MHz; commonly used in civil aviation for
communications and navigation
Page 21-14
(9-98) Original
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