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4.4.0 MONITOR OPERATION
4.4.1 SENS MON
The Service Monitor is capable of monitoring frequen-
cies of 3 MHz to 1 GHz with 1.5 uV sensitivity. The
monitor may be used to 1 MHz with reduced sensitivity.
1. Connect the BNC antenna (TEKA-24A) to the
antenna connector located in the RF section.
2. Set the FUNCTION switch to SENS MON.
3.
Select the modulation type using the MODE switch.
4. Enter the frequency from the keyboard
EJ~000000EJ
5. Adjust the squelch and volume.
6. Move the left cursor
[.6.J
to Dev/%AM. Move the
right cursor
~~
to frequency error. Listen to re-
ceived audio from the internal speaker and view on
the oscilloscope.
NOTE: The antenna input is fuse protected against in-
advertent keyup into the antenna input. Consult the
maintenance portion of the manual for fuse replacement.
In either PWR MON or SENS MON functions the
BANDWIDTH WIDE/NARROW switch selects the IF
bandwidth. Narrow band is ± 15 KHz modulation
acceptance used for most 2-way radio communication
systems and wide band is
±
75 KHz modulation accept-
ance used for commercial FM broadcast monitoring.
Mon 154.5500
l i t
I l l
+4.5 KHz
ANTENNA
FIGURE 4-3-TEST SET-UP FOR
OFF-THE-AIR MONITORING
CAUTION: Care should be taken to not exceed the
.5
watt
max. input level of the "Antenna Input".
4.4.1.1 SENS MON WITH SPECTRUM ANALYZER
(R-2400 only)
1. Connect the BNC antenna to the "Antenna" connec-
tor located in the RF section.
2. Set the Function switch to "Anlzr Sens Mon".
3. Adjust the Vertical and Horizontal Position controls
if necessary (see 3.6.8).
4. Ensure that "Vert Vernier" is set for "Cal".
5. Enter the RF frequency from the keyboard.
EJ~C!J00000EJ
4-3
6. Adjust the squelch and volume.
7. Adjust for desired dispersion of .01 Mhz/ div (see
3.6.3).
8. Adjust the RF step attenuator to give the desired
signal level.
9. Check for the presence of images using the Image
Hi/Lo switch (see 3.7.2).
4.4.2 PWR MON
For high power signal monitoring (.5 to 125 watts)
1. Connect the radio under test antenna out to the RF
IN/OUT connector on the Service Monitor.
2. Set the FUNCTION switch to PWR MON.
3. Enter the frequency from keyboard.
4. Move the right cursor to PWR.
5. Key the radio under test and read output power.
CAUTION: To prevent undue stress on the protected cir-
cuits it is advisable to always switch the system to the
power monitor before applying power in excess of 200
mw. Additional protection is also obtained by making it a
practice not to leave the step attenuator in the 0 dB
position.
High-powered equipment in the 1-30 MHz range, which
have unusually fast carrier rise times, may damage the
service monitor with repeated activation of the protect
circuit. Ensure the FUNCTION switch is in the "PWR
MON" position (this enables the protect circuit) before
RF power is applied to the equipment.
In either monitor mode, the displays can be selected
using vertical cursors to the left of each LCD to view
frequency, frequency error, modulation level, distortion
and power when in the PWR MON function for AM, FM
or CW signals.
D
Mon xxx.xxxx
L . _ _ _ _ _ _ _ , J
RF
IN/OUT
62.5w
TRANSMITTER
FIGURE 4-4-TEST SET-UP FOR
POWER MEASUREMENT
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