CDR-3250/80 TECHNICAL MANUAL
Issue 2.2 Change 1
3-1
CHAPTER 3
OPERATING INSTRUCTIONS
Section I. LOCAL CONTROL
3-1 INTRODUCTION.
This chapter contains both local (manual) and remote
control (using a remote control bus) operating instructions
for the receiver including a description of the controls and
displays and operating procedures.
3-2 LOCAL OPERATION.
Local (manual) operation is performed using the front panel
controls and displays.
3-2.1
Controls and Display.
(See figure 3-1.) Table
3-1 lists the front panel controls, and display, and their
functions.
3-2.2
Parameter Entry.
Figure 3-2 shows the parameter
entry controls and display used to change the receiver
parameters. Each is described below.
3-2.2.1
Vacuum Fluorescent Displays.
The vacuum
fluorescent display shows two basic displays; normal, and
data entry. The displays are described below.
3-2.2.1.1
Normal Display.
The normal display (figure
3-3) shows the basic receiver parameters including channel
number, skip, receive mode, squelch or BFO setting,
operating frequency, bandwidth selection, AGC/MGC
selection, local or remote control selection, the soft key
menus, and NEXT to indicate that there are other soft key
labels available in the menu. Five soft keys (unlabeled) are
located below the menu. The labels for the soft keys
appear in the menu display immediately above each key.
When a soft key is pressed, the function above the key is
selected. Pressing the NEXT key (when NEXT is
displayed in the display) selects a different set of soft key
labels.
3-2.2.1.2
Data Entry Display.
The data entry display
(figure 3-4) is present during most soft key entries. Basic
receiver parameters are shown on the right side of the
display. The center of the display is used for operator
instructions and parameter entry display. (BFO frequency
entry is shown).
3-2.2.1.3
Meter Display.
Although not considered a basic
display, the meter display (figures 3-5 and 3-6) shows the
basic receiver parameters and can usually be displayed
from the normal or data entry display when the MTR/MNU
key is pressed. The soft key menu is replaced with two or
three meters depending on the receive mode. In the ISB
receive mode the FRQ meter is replaced with a SELECT
soft key to allow selection of the ISB monitor mode. Each
of the meters has an analog arrow that shows the
approximate reading on the meter while the center of the
meter shows a numeric reading. Each meter is described
below.
NOTE
When the meters are displayed, the first four
s o f t k e y s s e l e c t t h e P R I M A R Y ,
SECONDARY, SCAN/SWEEP, or UTILITY
soft key menus respectively. However, if the
meters are displayed in a submenu (i.e. freq.
change), these soft keys are not active.
RF meter -
Indicates RF signal strength from -115 to
+10 dBm (signals less than -115 dB
displayed as "<115").
AF meter -
Indicates audio level at the 600 ohm output
on the rear panel from -50 to +12 dBm.
FRQ meter -
(Not shown when ISB mode is selected).
Indicates the frequency of a carrier type
signal with respect to the center of the IF
bandwidth. When exactly on center
frequency, the display should read 000.
When the bandwidth is at or below 2 kHz,
the meter displays in Hz. When bandwidth
is above 2 kHz, meter displays in kHz.
NOTE
Either the normal display or the meter display
may be displayed as the default. Pressing the
MTR/MNU key will alternately select either
display. Refer to paragraph 3-7.5.4 to change
the default setting.
3-2.2.1.4
ISB Monitor Mode.
When ISB mode is
selected, there are separate squelch and AGC decay setting
for the normal (USB) and alternate (LSB) channels. The
ISB Monitor mode determines which channel is affected by
changing these parameters in the normal way, and which
channel is displayed by the RF and AF meters. The current
ISB Monitor mode is indicated in the normal display by a
small “U” or “L” following the “ISB” in the mode display,
see figure 3-6.
From the front panel the ISB Monitor mode is changed by
selecting the meter display and pressing the SELECT soft
key. From the remote control interface the ISB Monitor
mode (also referred to as the ISB Access Mode) is changed
with the
V*
command.
3-2.2.2
Controls.
(See figure 3-2). Table 3-2 lists the
parameter entry controls, the display and their functions.
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