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The last 30 frames of data from the radio are stored
and can be recalled for further analysis. To recall a
frame, enter a number from 0 to 29 in the "Frame:"
field (29 being the most recent), and the selected
frame will be displayed. To reset the "Frame:" and
"Frame Counter:" fields, press the frame reset
softkey.
The "Raw:" field displays the captured link control
format data for a single frame in hex format.
22-3
PROJ 25 CONV RADIO RECEIVE
TESTS (Generate Mode)
This section describes the basic test setup for
testing Project 25 radio received voice and
embedded data.
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 Generate 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 make the selections shown
below. External must be set to a value and
turned on with ~ to enable the input from the
microphone of the analyzer.
NOTE
5. Place the cursor on VOICE FRAME in the
Audio Zone, and press the display table
softkey. The VOICE FRAME ENCODE screen
shown in Figure 21-14 will be displayed.
6. Insert the appropriate values into each of the
fields of the VOICE FRAME ENCODE table or
press the default frame softkey to enter pre-
programmed values. It is essential to enter the
correct Network ID code that matches the radio.
This can be determined from the VOICE
FRAME DECODE table when monitoring the
transmitted voice frames from the radio (refer to
Section 22-2).
7. Press the return softkey from the VOICE
FRAME ENCODE screen.
8. Press the DISP hardkey then move the cursor to
the "Display:" field and select the CLEAR
SCOPE softkey.
9. Connect a microphone to the analyzer and press
the PTT. Note that when the microphone PTT
is pressed, the Project 25 analog voice can be
observed on the CLEAR SCOPE in the Display
Zone. Turn on the radio and talk into the
microphone of the analyzer. If the radio is
operating, the received voice will be heard from
the speaker of the radio.
22-4
BER TESTING THE RADIO
RECEIVER (Generate Mode)
This application example describes the receiver test
for radios that have BER test capability.
receiver must have the capability of comparing an
unencrypted received signal with a stored 1011 Hz
Tone Test Pattern. Performance of this test requires
the analyzer to operate in Generate mode with
either 1011 Hz Tone Test Pattern or Calibration
282
The
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