TABLE 2-1. CONTROLS, INDICATORS,
AND
CONNECTORS
ITEM DESCRIPTION
FRONT
PANEL
(figure 2-1)
FUNCTION
FUNCTION
switch
PUNcnON
indicators
Two-position toggle
switch
Six LED's (red)
8.
DVM/DIST
a. DVM - The digital voltmeter displays
AC/DC
voltage readings (digital and analog) with the
corresponding dBm value on the
CRT
screen, in
either generate
or
monitor function. Select AC
or
DC with the display cursor and keypad. The
screen displays battery voltage and a signal's true
RMS at the front panel DVM jack. Use the meter
to check and set power supply voltage, bias level,
and audio level.
b. DISTORTION - This mode automatically meas-
ures fixed frequency
EIA
Sinad/Distortion
(signal
to noise and distortion ratio). The Analyzer
generates a
1 KHz tone
of
known quality.
Measure distortion
of
AM
or
PM transmitter
modulation. Use the distortion meter for a com-
prehensive check
of
a receiver's performance.
9. Ext Wattmeter - Select the element and the screen
displays the forward and reflected power passed
through
that
element mounted in the RTL-4055 watt-
meter adapter.
10.
IF
- The screen displays the 700 KHz
IF
signal from
the monitor receiver for
AM
and SSB receiver servic-
ing.
11. Scope
AC
-
The
screen displays the voltage wave-
form applied to the vertical input (AC coupled).
12.
Scope
DC
- The screen displays the voltage wave-
form applied to the vertical input (DC coupled).
Select either generate
or
monitor function.
I. Generate - The equipment generates and outputs an
RF
signal.
2.
Monitor - The equipment monitors input signals
with the input terminated into the receive mixer. Use
this position for off-the-air monitoring.
Indicates the mode
of
signal the equipment
is
set up to gen-
erate
or
monitor. Select by pressing one
of
the arrow keys
under the
FUNCTION
section.
I.
FM
- Equipment generates or monitors frequency
modulated signals.
2.
CW
- Equipment generates
an
unmodulated RF
signal (continuous wave). Monitor position provides
only frequency error measurement.
2-4
'-.--
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