Motorola R-20018 Manual page 24

•
Table 4-1. Controls, Indicators, and Connectors (Coni)
Item
Description Function
Table 4-1. Controls, Indicators, and Connectors (Coni)
Item
Description Function
Horiz Vernier control Potentiometer
Horizontal sweep rate Vernier or external hori-
zontal input gain Vernier. Calibrated position
is fully clockwise.
Type N connector
RF In/out connector RF input in the power monitor or monitor
mode, RF output in the generate mode.
Ext Horiz BNC connector
Allows external horizontal inputs for oscilloscope.
Potentiometer
RF Level Variable Vernier control of RF output level. Exceeding
Trig Level Stacked concentric Selects oscilloscope trigger level and trigger
control the AM limit marking in AM generation mode
potentiometer and
mode. Center knob selects the level of trigger.
may result in a distorted output.
switch
Outside (largest) knob controls the trigger
mode. In Auto position, continuous sweep with
14-position ganged
R F Level Step Ten dB per step control of RF output level
allen and switch
switch in generate mode. Also serves as RF input
no vertical input signal, syncs on vertical input.
level step attenuator in monitor and spectrum
Normal position, no sweep unless vertical input
analyzer modes.
is present, syncs on vertical input.
Ext Wattmeter
Connector Allows input from Motorola ST-1200 series in-
Position controls Stacked concentric Controls the position of the CRT display, when
line wattmeter elements for measurement and
controlled potentiometer in the oscilloscope mode.
CRT display of forward and reflected trans-
• Vert Center (small) control
Controls the vertical position of the CRT
milled power.
knob display
• Horiz
Outside (large) control
Controls the horizontal position of the CRT
knob display
Freq Set controls
Stacked concentric Controls the duplex generator output frequency
potentiometers in the Duplex Generation mode.
Vert switch Four-position rotary
Oscilloscope operation uses values marked to
switch
the right of the switch, indicating volts per
division on the CRT. Values marked to the left
• Coarse
Inside (small) control Coarse frequency control.
knob
• Fine
Outside (large) control Fine frequency control.
of the switch are used during modulation
knob
display mode, indicating range for calibrated
Frequency offset Three-position switch Selects the offset of the transmitted frequency
FM deviation.
control (0-10 MHz/Off from the selected receive frequency (Image/
NOTE: Frequency Counter sensitivity
/45 MHZ)
Dplx switch determines side of selected
is also controlled by this switch.
frequency the offset will be). 0-10 MHz position
Vert Vernier control Potentiometer
Vernier gain control for vertical inputs to the
CRT when in the oscilloscope mode. Fully
clockwise is the calibrated position.
allows frequency offset to be varied between
0-10 MHz. In the 45 MHz position the offset
is variable over a small range around 45 MHz
with the use of the Fine frequency control.
Vert/Sinad/DVM/
BNC connector Signal input to the equipment for the following
Counter In connector
operations:
Output connector BNC connector Output connector for duplex generator output.
a. External vertical for oscilloscope
SIDE PANEL (fig. 4-2)
operation
Frequency Standard Potentiometer Allows calibration of the time base frequency
b. SINAD Meter
control (freq std)
c. Frequency Counter
REAR PANEL (fig. 4-3)
d. Digital Voltmeter
DC SA
Line fuseholder (8 amp) DC Input line fuseholder
4-10
4-11