COMPONENT MAINTENANCE MANUAL
IN 1502H RADAR INDICATOR
TM109102
1-6
May/01
A separate alphanumeric set is used for generating characters from an optional
checklist unit (CC-2024B, C or D). Checklist data is displayed as 32 characters per
line, but using only 12 character lines on the screen, for a total of 384 characters. Four
lines are left blank.
B. Display of Composite Video
The IN-1502H Radar Indicator is capable of displaying “TV” signals from an aircraft
source instead of the radar/overlay data from the interface unit. The indicator can display
625-line, 50 Hz CCIR (International Radio Consultive Committee, International
Telecommunications Union) or 525-line, 60 Hz RS-170 composite video signal inputs.
Selection between display of interface unit inputs and composite video data is
accomplished via the COMP VIDEO EN pin on the rear connector (see Table 1-1). When
this pin is grounded, the unit will display either CCIR or RS-170 video information from the
aircraft. When the pin is not grounded, the indicator will display radar/overlay information
as determined by the settings of the switches on the radar control unit.
A second pin on the rear connector (CCIR/RS170) allows selection between CCIR and
RS-170 inputs when the COMP VIDEO EN pin is grounded. When CCIR/
RS170 is
grounded, RS-170 data will be displayed. When this pin is not grounded, CCIR data will
be displayed.
(1) CCIR Video Signal Format
The CCIR video signal consists of a picture signal that controls the light output of the
receiver picture tube and a synchronizing signal for locking the line and field sweep
circuits at the indicator so that the picture is reconstituted correctly. The CCIR video
signal is the standard PAL (phase alternating line) 635-line, 50-field, interlaced TV
signal used throughout Europe. It is shown in Figure 1-3.
The first 30% of amplitude is allocated to sync signals and the remainder (30% is
black and 100% is peak white) to luminance.
The document reference is online, please check the correspondence between the online documentation and the printed version.
