Operation; Calibrate - Motorola R-20018 Manual

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Table 4-1. Controls, Indicators, and Connectors (Cont)
Item
Description
Function
DC IN power
4-pin connector
Connects to DC prime power source
connector
AC power connector
3-pin connector
Connects to AC prime power source. Internally
patched to accommodate either 100-110 VAC,
110-130 VAC, 200-220 VAC or 220-260 VAC.
AC 1.5A
Line fuseholder
AC line fuseholder.
10 MHz std IN
BNC connector
Provides for external 10 MHz time base input.
connector
Equipment automatically switches to external
time base with an input at this connector.
10 MHz std OUT
BNC connector
Provides an output of the internal or external
connector
10 MHz time base for external use.
488 BUS connector
Placement of 1/0 connector when IEEE-488
Interface Bus option is provided.
Blower power
4-pin connector
Placement of Blower power connector,
connector
4-5. OPERATION
4-6. The operator may use the CAT display to become familiar with the functions the Communication System
Analyzer is capable of performing. The unit may be preset to any of the functions the unit performs. As a
function and its parameters are selected they are displayed on the CAT.
The unit contains a nonvolatile memory that stores frequently used data for fast access, reducing setup time.
As a function is selected. if data for that function is stored, the data is displayed on the CAT.
One of the stored parameters may be used or the user may manually select (keyboard entry) the parameters
required for the function. Selection of stored data or keyboard entry of data is cursor controlled. As a control is
changed the CAT display changes to reflect the new parameter being used or function being performed.
4-7. CALIBRATE. The Communication System Analyzer may be calibrated to WWV or other
time/frequency standards (figure 4-4). To calibrate the unit's time base (frequency standard) proceed as
follows:
a. Connect antenna to AF In/Out connector.
b. Set FUNCTION switch to Monitor and DISPLAY to Gen/Mon Mtr.
c. Enter frequency of time/frequency standards station directly from keyboard.
4-12
Table 4-1. Controls, Indicators, and Connectors (Coni)
Item
Description Function
Mod Out connector
BNC connector Output connector for all modulation signals
(all signals combined).
Volume control
Potentiometer Controls speaker output level.
BW switch
Two-position switch In either Pwr Mon or Monitor modes selects
IF bandwidth. NB is ±6 kHz mod acceptance
bandwidth. WB is ±100kHz mod acceptance
bandwidth. In Gen FM mode selects modulation
range. 0-25 kHz dev in NB mode or 0-100 kHz
dev in WB mode.
BFO control Potentiometer/switch BFO on/off and beat frequency control
for sideband reception. Full Counterclockwise
position is off.
NOTE: To minimize interference the BFO
should be turned off when not in use.
Sig Lvi/Zero Beat LED (red) Flashes at a rate equal to the difference
indicator between the received carrier frequency and the
programmed frequency. Also is used as a
squelch indicator.
Squelch control Potentiometer Adjusts squelch threshold level, full counter-
clockwise position disables squelch.
NOTE: Monitor sensitivity is greatly decreased
(for high-level use) as the control is increased
clockwise beyond the quieting point.
lmage/Dplx switch Two-position switch In duplex generation mode, controls the duplex
frequency output for above (High) or below
(Low) the receive programmed frequency. In the
monitor mode it selects the frequency of the
local oscillator injection above or below the
programmed monitor frequency to remove
image interference.
Demod Out BNC connector Receiver audio output.
connector
Oscilloscope Horiz Seven-position When in the oscilloscope mode, selects the
switch rotary switch horizontal sweep rate or selects the external
horizontal input.
4-9