Section 22
APPLICATIONS
CAUTION
When testing a radio, observe the following precautions:
Use double-shielded cables on the analyzer to carry signals to and from the radio.
Locate the analyzer at least thirty five feet from the antenna of a unit that is
working in the same system that the analyzer is testing.
Adjust the squelch to where the LED indicator for squelch just turns off or is
closed. When the signal from the radio is present, the squelch LED will
illuminate indicating that squelch has been detected and there is a signal present.
22-1 General Information
This section contains operational testing examples
for testing Project 25 radios.
22-1.1 Configuration for Monitor Mode Testing
To configure the analyzer for Monitor mode testing,
first select PROJ 25 CONV for the “Mode:” field in
the Display Zone. Next select Monitor mode for
the “RF Control:” field and the appropriate settings
for “B/W:”, “Freq:”, and “Attenuation:” fields in
the RF Zone.
The “Mon RF In:” field in the RF Zone has two
softkey selections: ANT and RF IN/OUT. The
ANT port accesses the analyzer’s sensitive receiver
and should be used for “off the air” or low power
measurements. If an antenna is used with the ANT
port, attach the supplied antenna to the ANT port.
The RF I/O port should be used for direct
connection to the radio under test. If RF I/O port is
used, connect a coaxial cable from the analyzer’s
input port to the radio’s output port.
NOTE
Do not directly apply excessive input power to
the ANT port. In the event that excessive RF
power is inadvertently applied, the port is
protected by in-line RF fuse. The fuse may be
accessed by unscrewing the front of the BNC
connector out of the front panel.
22-1.2 Configuration for Generate Mode
Testing
To configure the analyzer for Generate mode
testing, first select PROJ 25 CONV for the “Mode:”
field in the Display Zone. Next select Generate
mode for the “RF Control:” field and the
appropriate settings for “B/W:”, “Freq:”, and
“Output Lvl:” fields in the RF Zone.
Place the cursor in the Audio Zone and select the
desired levels for the summed modulating signal
and Project 25 deviation. Remember to enable the
switches to the right of the level entry. To transmit
anything other than 1011 Hz Tone Test pattern,
Calibration Test pattern or silence pattern, the
Generate code in the Audio Zone must be set to
VOICE FRAME.
Place the cursor on the “Gen RF Out:” field in the
RF Zone. This field has two softkey selections:
GEN and RF IN/OUT port. The RF I/O port is
recommended for most applications where the
generate (GEN) and monitor (MON) ports are
combined for a single connection to the radio under
test. The GEN port is recommended where higher
levels of output signal are needed. Connect a
coaxial cable from the selected output port to the
input of the radio.
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