NOTE
Do not apply input power to the GEN output
port. In the event RF power is inadvertently
applied, the port is protected by in-line RF fuse.
This fuse may be accessed by unscrewing the
front of the BNC connector out of the front panel.
22-2 PROJ 25 CONV RADIO TRANSMIT
TESTS (Monitor Mode)
This section describes the basic test setup for
testing Project 25 radio transmitted voice and
embedded data.
NOTE
If the selected radio channel is encrypted, select
the analyzer encryption algorithm and key as
described in Section 21-7.
1. Place the cursor in the RF Zone and configure
the analyzer in Monitor mode as shown in the
example below:
2. Select the desired frequency that matches the
radio under test; 806.0625 MHz is used in this
example.
3. Connect the RF input/output of the radio under
test to the RF I/O port of the analyzer as shown
in Figure 21-4.
4. Press the AUD hardkey to place the cursor in
the Audio Zone and select VOICE FRAME.
5. Press the DISP hardkey to place the cursor in
the Display Zone.
NOTE
If the radio transmit frequency is unknown, it can
be determined by turning on the radio, pressing
the radio PTT and placing the analyzer in RF
Scan mode. Refer to Section 21-7.1.2 under the
General Operation tab for a description of the
RF Scan function.
Place the cursor in the “Meter:” Field and select
RF DISPLAY. The monitored frequency,
deviation, frequency error and input power level
are all displayed in the Display Zone.
22-2.1 PROJ 25 CONV Voice
To display the voice analog waveform move the
cursor to the “Display:” field in the Display Zone
and select CLEAR SCOPE. Press the radio PTT,
speak into the radio microphone, and turn up the
volume on the analyzer. If the radio is operating,
the transmitted voice will be heard from the speaker
of the analyzer.
22-2.2 PROJ 25 CONV Voice Frame Embedded
Data
To display the voice fram
e embedded data, move
the cursor to the “Display:” field in the Display
Zone and select VOICE FRAME. The Voice
Frame decode table will be displayed as shown in
Figure 21-19. Press the decode start softkey then
press the PTT on the radio to display the embedded
data. As each frame is captured, the number
displayed in the “Frame Counter:” field will be
incremented. Press the decode stop softkey to
discontinue capturing frames.
281
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