Garmin G3X Installation Manual page 313

23.4.4 Video Input
Figure 23-11 View of Video Input BNC Connector from Back of Unit
The GDU 45X/46X supports the following composite video input formats:
• NTSC "National Television Standards Committee" (J,M,4.43)
• PAL "Phase Alternating Line" (B,D,G,H,I,M,N,Nc,60)
• SECAM "Sequential Color with Memory" (B,D,G,K,K1,L)
Composite video is a one-wire format with intensity, color, and timing information transferred together.
Video signals are transferred using a 75 Ω coaxial cable (see the following recommended cable types.)
• M17/94-RG179, PIC Wire & Cable p/n V75268 or V76261,
• M17/94-RG179, Electronic Cable Specialists (ECS) p/n 442501 or equivalent
NOTE
Particular attention must be taken in routing the coaxial cable through the aircraft to
avoid potential radiated interference sources in addition to minimizing the cable bend
radii. Concerns about interference sources may necessitate the use of coaxial cable with a
higher noise rejection rating.
NTSC (M) (also called RS-170A), is the most common video format supported by the GDU 45X. NTSC
has the following characteristics:
• 59.94 Hz vertical interlaced refresh rate
• 15.75 kHz horizontal line frequency
• 525 scan lines
• 29.97 frame per second update rate
• Luminance or luma (black and white) also called "monochrome NTSC" or RS-170, is the standard
black and white format which contains both image and timing information.
• Chrominance or chroma (color) encoding system
23.4.5 Aircraft Power
The GDU 45X/46X can operate using power from one or both inputs (AIRCRAFT POWER 1 AND
AIRCRAFT POWER 2). The pins are internally connected using diodes to prevent current from flowing
between the two power inputs. AIRCRAFT POWER 2 is for connecting to an alternate power source, such
as on aircraft with two electrical buses. Use 22 AWG wire (min) for all power and ground connections.
Pin Name
AIRCRAFT POWER 1
AIRCRAFT POWER 2
POWER GROUND
POWER GROUND
190-01115-01
Rev. AA
Connector
P4502/4602
P4502/4602
P4502/4602
P4502/4602
G3X/G3X Touch Installation Manual - LRU Pinouts
Pin I/O
32 In
31 In
15 --
16 --
Page 23-22