13-9.3 BER Encode
The Audio Zone provides controls for both
signal level and frequency deviation of BER
baseband signal that is used to modulate the
SECURENET RF transmissions.
13-9.3.1 Monitor Mode
When Monitor is selected in th
e RF Control
Zone and code BER is selected in the Audio
Zone, the analyzer is configured to receive a
BER pattern. The received BER pattern can be
displayed in the Display tri-sector and
measured in the Metering Zone.
13-9.3.2 Generate Mode
The analyzer can generate SECURENET BER
patterns when placed in the Generate mode.
The SECURENET signal is encrypted with one
of the hardware algorithms. The Audio Zone
provides the "Code:" field to select BER
generation.
When code BER is selected in the Audio Zone
(figure 13-14), the R2670 modulates BER on
the carrier at either of two output ports:
RF I/O port, or
GEN OUT port
In Generate mode, modulation deviation is
controlled in the Audio Zone by a switch with
values of Off and Continuous, and a level
control. Move cursor to the switch field and
turn deviation on "~" or off "X" using the
softkeys.
Use the keypad or TUNING knob to enter the
desired deviation. The deviation range varies
depending on whether the bandwidth (in the RF
Zone) is set to narrow or wide.
BW Setting Deviation Range
Narrow 0.50 to 5.00 kHz maximum, in
0.05 kHz increments
Wide 05.0 to 50.0 kHz maximum, in
0.50 kHz increments
The baseband signal of the generated BER
pattern is available at the MOD OUT connector
on the front panel.
13-9.3.3 Duplex Mode
The analyzer can generate SECURENET BER
patterns when placed in the Duplex mode. The
Audio Zone user interface is the same as in
Generate mode.
Figure 13-14. SECURENET Audio Zone – BER Generate Mode
183
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