Raytheon Pathfinder 1200 Instruction Manual page 71

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27) Master Oscillator
The master oscillator produces the 6 MHz clock pulse for the CRT display and
the system control.
28) Horizontal Counter
The horizontal counter produces the X address data at the display time from the
clock pulse of the master oscillator.
29) Vertical Counter
The vertical counter produces the Y address data at the display time from the
output of the horizontal counter last stage.
30) Horizontal and Vertical Synchronizing Pulse Generator
This circuit produces the pulses for synchronizing horizontal and vertical deflec-
tion of the CRT display unit.
31) SHM Generator
The SHM generator produces the pulses for displaying the ship's heading marker
on the screen.
32) 90 Sec Timer
The 90 Sec Timer circuit provides the delay time which is required for warm up
of the magnetron.
33) SHM Mixing, Blanking Gate
The SHM Mixing circuit is used for mixing the video pulses and the SHM pulses.
The blanking gate circuit switches the mixed signal by display timing.
34) Video Buffer
The video buffer circuit controls the CRT intensity according to the BRIL SW
setting on the front panel and drives the video circuit of the CRT display unit.
35) Display PCB
The display PCB contains the horizontal deflection circuit, the vertical deflection
circuit and the power supply circuit for the display unit which is supplied from
12 V de.
36) Video PCB
The video PCB contains the final video amplifier circuit for driving CRT cathode.
37) Control Panel Circuit PCB
The control panel circuit produces the signals for controllings the display circuitry
by setting control knobs and control switches on the front pannel.
38) AVR Circuit
The AVR circuit generates a regulated output voltage of 17 V de from the ship's
mains of 12 V, 24 V, or 32 V de.