TM 11-6625-2575-14
are then amplified, shaped, and added to the de-
controlled in amplitude with potentiometers
modulated video signal and applied to the vertical
R305, R306, R311, R312, R317, R318, R324, and
R325. This allows each marker to be adjusted to
a different amplitude and gives rapid identifica-
b. Three rf sweep samples are obtained from
.
the rf output at the monitor point (the junction
display.
of CR601 and R602), and coupled to the resis-
tance bridge consisting of R603, R604, R605,
e. Four amplifier stage are built on the plug-
in marker printed circuit board. Each amplifier
and R606. Two of the samples at J606 and J609
are provided for each of four optional internal
The output of all four amplifier stages is fed
markers. When an EXT MARKER is used, the
through common emitter amplifier Q305. The
signal is coupled to mixer diode CR602 where it
plug-in marker signals from Q305 and the ex-
mixes with the third sweep sample from the resis-
ternal marker signal from Q306 are coupled to a
tor bridge. The resulting signal is coupled to
common birdie amplifier stage which includes
external amplifier Q306, a high gain, common
the MARKER SHAPER circuit consisting of
emitter amplifier.
C307, C308, C309, C310, C311, C315, C316, C317,
c. Resistor R331 is a front panel EXT MARK-
L301, R334, R335, R342, and R343. The shaped
ER SIZE control which allows the external mark-
marker is further amplified in Q307.
er system to accept a wide variation in signal
f. After amplification, the markers are applied
source amplitudes.
to MARKER SIZE potentiometer R339, which is
a f rent panel adjustment. The markers are avail-
has its own internal size adjustment. The markers
able at the SCOPE VERT output connector on
the front panel.
produced in each plug-in can be independently
6-4