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Bandwidth:
This allows the user to program the receiver IF bandwidth. The allowed settings are
"AUTO" or "WIDE". The receivers used in the RFBA are state of the art DSP based receivers and in
most conditions the AUTO setting is highly recommended. If the primary use of a specific receiver is
as a modulation analyzer, then the WIDE setting will give the most accurate results.
Volume Level:
This allows the user to adjust the audio output levels on the Phoenix connector. The
user can adjust the output level in 0.1 dB steps. The default setting is 0 dBV, which is equivalent to
1 V
into a 600 ohm load single ended. The signal is twice that level if using the differential
RMS
signals. The user can select between +10dBV and -40dBV. The volume level should not be set
above +3.0dBV for a received station broadcasting 75 kHz deviation. Exceeding that level will start
to cause distortion in the output audio. If using a single ended configuration, use the + outputs and
GND as the audio reference. In
reference. Note that the V
signals.
dBV
3.0
2.5
V
1.413
1.334
rms
V
3.995
3.772
pk-pk
dBV
-3.5
-4.0
V
0.668
0.631
rms
V
1.890
1.785
pk-pk
Tuner Monitor Menu
Each tuner has a separate monitor menu and can be viewed independently. While in the monitor
menu the user is not allowed to modify any of the tuner setup parameters, only viewing of the
received parameters are allowed. The menu structure for all tuners are identical thus the following
descriptions is relevant for all three tuners. A description of each of the monitor features is detailed
below:
RFBA User Manual
F
9, conversions from dBV to V
IGURE
and V
are actually twice that level when using the differential
rms
pk-pk
2.0
1.5
1.0
0.5
1.259
1.189
1.122
1.059
3.561
3.362
3.174
2.996
-4.5
-5.0
-5.5
-6.0
0.596
0.562
0.531
0.501
1.685
1.591
1.502
1.418
Figure 9 - Audio Level Conversions
Crown Broadcast
rms
0.0
-0.5
-1.0
-1.5
1.000
0.944
0.891
0.841
2.828
2.670
2.521
2.380
-6.5
-7.0
-7.5
-8.0
0.473
0.447
0.422
0.398
1.338
1.263
1.193
1.126
and V
are included for
pk-pk
-2.0
-2.5
-3.0
0.794
0.750
0.708
2.247
2.121
2.002
-8.5
-9.0
-9.5
0.376
0.355
0.335
1.063
1.004
0.947
Page 13
-3.5
0.668
1.890
-10.0
0.316
0.894
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