TB 9-6625-2197-50
(7) Adjust oscilloscope main TRIGGER LEVEL and HORIZONTAL position
controls to place positive leading edge of sync pulse from pulse generator (CH2) on second
graticule line. If waveform (fig. 6, inset H) is not present, adjust radar test set RF output
power level until waveform is just solid.
NOTE
A pulse just solid is characterized by a narrow pulse width (at
.5 s wide) having a low intensity trailing edge, additionally, as
the radar test set RF power is increased from at -28 dBm
through -24 dBm (ideal) to near -21 dBm, a noticeable change
will occur in the pulse width and negative amplitude to a point
little or no additional effect. See figure 12 below for example.
NOTE
(8) If RF power output level of the radar test set (at the just solid waveform point),
including the insertion loss of circulator and cable, is not between -22 and -26 dBm, perform
b (1) and (2) below. Record actual value.
(9) Move oscilloscope probe from TJ 28 connector and place in TJ 29 connector of
control box.
(10) Adjust radar test set power output to -21 dBm (include circulator and cable loss).
(11) Adjust radar test set oscilloscope TIME/DIV control to 500 ns.
(12) If oscilloscope does not display waveform (fig. 6, inset I), adjust radar test set RF
power output level until waveform is just solid.
24
