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When using the transceiver port (RF In/Out) disconnect
the antenna from its port.
--) 466.9750 MHZ
MONITORFM
o
INPUT WATTS
2.05
125
A frequency error or actual frequency displays oper-
ates simultaneously with FM or AM to 80%. For the
SSB mode, the display shows either the error fre-
quency or the actual frequency of the MONITOR
BFO. Monitor SSB mode receives SSB signals with
t-!tt', -
use of the BFO. Adjust the BFO frequency over the
J
range of ± 3 KHz from the monitor center frequency.
+
100
+4.75
o
DEV KHZ
12)
-4.72
13)
l--
_
14)
-100
0.50
ERROR KHZ
-15
-5.13
-100
o
DEV KHZ
o
+
15
+5.23
+ 100
The display shows posItIve and negative modulation
level of recovered FM in digital and analog readouts.
The reading in peak KHz autoranges full scale between
10 KHz and 100 KHz. During overload conditions the
CRT omits the bargraph and a warning message
replaces the normal modulation display:
INCREASE INPUT ATTENUATION
DEV ALARM
07.0 KHZ
FIGURE 3-14.
MONITOR MODE METERING DISPLAY
Figure 3-14 defines a monitor mode metering display.
Set the toggle switch to Monitor, the FUNCTION to
FM, and the DISPLAY to Gen/Mon Mtr. Here is a
1ine-by-line description of this display:
On line I the CRT displays MONITOR FM. When the
operator uses the keypad and the display cursor to
t:nter a preset channel number, between 01 and 32, the
CRT displays the appropriate frequency from the RF
Memory table and the system operating frequency
changes as required. If the operator enters a new fre-
quency, dashes replace the channel number and the
frequency changes as required.
I) MONITOR FM
•• ) 454.1252 MHz
The warning will not appear for inputs below -40 dBm
at the antenna port or below
-10
dBm at the trans-
ceiver port with the RF Step attenuator in the 0 dB
position. Use the attenuator to reduce the input signal
level and remove the overload warning.
A continuous audible alarm sounds when a preset
deviation limit is exceeded. Depress both keypad cur-
sor keys simultaneously to invoke the Special Function
display. Use the keypad to enter code #78XYZ to pro-
gram the deviation alarm from 0.1 KHz to 99.9 KHz
with 100 Hz resolution. Enter special function code
#78000 to disable the alarm.
15) ANT displays only when the antenna input on the
front panel is enabled. ATTEN)
0 displays whenever
the RF Step attenuator is at a setting other than the
0
dB position and the monitor mode is in use.
'---.-/
Line 4 displays the input signal level at the RF In/Out
connector from -70 dBm to
3 dBm with indication in
volts (use attenuator). Above 30 dBm, indication
switches to watts. The three-digit watts reading
autoranges between 10, 100, and 125 watts full scale.
If front panel settings or input conditions do not allow
accurate determination of dBm or volt readings,
dashes replace the reading.
The zero centered bargraph reflects the frequency
error. The graph originates at the center of the
display, moves to the left to indicate increasing
negative error, and to the right to indicate increasing
positive error. The graph responds in a modified
logarithmic manner that provides a smooth nonrang-
ing analog display on a full scale of ± 15 KHz in nar-
row BW and
±
15 KHz in wide BW. If the operator
enables direct frequency readout mode, the CRT omits
the graph.
4) -62.4 DBM
INPUT LEVEL
9)
10)
11) -IS
ERROR KHZ
•
o
170.0 uV
-1.05
+
IS
3-6
• SPECIAL FUNCTION MODE
Use the special function mode to expand the Analyzer's
capability into areas not required for general use. Use
the keypad to enter control information into the system
and to customize for user preference without the use of
a specific CRT display. To enable a special function, at
any time and during any mode:
SIMULTANEOUSLY DEPRESS BOTH KEYPAD
CURSOR KEYS
and then release. The screen changes to show a special
function command display. Two dashes appear on the
screen under the words:
SPECIAL FUNCTION ENTRY.
Use the keypad to enter the two-digit special function
code selected from table 3-3. Entering the code's last
digit activates the selected function. If more data is re-
quired, more dashes appear on the screen. Enter the.ad-
ditional data. The system reverts to the previous nor-
mal screen either shortly after data is entered or after
10 to 15 seconds of no data entry. Repeat the sequence
for each code to activate multiple special functions.
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