TM 11-6720-242-35
Figure 2-5. Scan drive system, waveforms.
2-13. Functioning of Annotation Pulse Circuit
numeric or binary information pertinent to the aircraft
mission. The data generated in the adas equipment of
a. The function of the annotation pulse circuit (fig.
the aircraft is transmitted to the recording head
2-10) is to supply aircraft equipment with a pulse that
assembly (rha) located in the body. The capping blade,
will coordinate the timing of the aircraft equipment with
activated by the capping cam (fig. 2-6), blocks off part
the camera operation. The annotation pulse circuit
of the variable slit (fig. 2-13) just before the film stops
converts the pulse initiated by the puck switch (para 2-
advancing, thus leaving a portion of film unexposed.
15) to a 6 + 1.5 volts, 500 + 250 microseconds isolated
When film advance stops, the adas pressure plate
pulse.
clamps the film (para. 2-3a). The coded information
b. When Q2 is turned on, as described in
appearing on the rha, is then projected by a lens and
mirror assembly and photographed on the unexposed
of time that Q2 is turned on and together with the
portion of the film:
primary winding of transformer T1 furnishes the duration
b. The adas is not functionally a part of the
of the pulse. The secondary winding of transformer T1
camera, but is identified with the camera to the extent
isolates and provides the shape and width of the pulse.
that the lens, the mirror assembly and the rha is housed
VR1 clips the pulse at an amplitude of 6 + 1.5 volts and
in the body. A v/h reference voltage for the adas
CR1 prevents any back voltage. This output pulse
aircraft equipment is applied through V/H SEL switch
interfaces with the data annotation system being used in
3S3, located in the control panel.
the aircraft and provides the command necessary for
the recording head assembly (rha) display. The data
2-15. Functioning of Puck and End of Film
annotation system being utilized by the aircraft would be
Switches
either the AN/ AYA-5 Bowmar or the AN/AYA-10 Hiller
annotation systems.
(figs. 6-11 and 6-12)
a. Puck Switch. The puck switch 1SI is located in
2-14. Functioning of Auxiliary Data
the body (43, fig. 3-4 (2)) and is actuated by the timing
Annotation System
cam (fig. 2-6). It is momentarily closed to ground twice
during each revolu-
a. The function of the auxiliary data annotation
system (adas) is to record on the film alph-
2-13
