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The center frequency of the FM demodulator can be adjusted by means of bit 56 to 59. At the
center frequency, the DC voltage at the MPX output pin 11 is equal to the MPX offset voltage
that can be measured at pin 11 while MPX mute is active (bit 7 = 1). This adjustment will affect
the center frequency of all integrated filters as mentioned before.
Table 4-19.
Demodulator Gain in Weather Band Mode
4.17
Soft Mute
Demodulator Gain in Weather Band Mode Relative to FM Mode
14 dB
17 dB
21 dB
23 dB
Table 4-20.
Demodulator Fine Adjustment
Demodulator Fine Adjustment
Fine tuning ON
Fine tuning OFF
Bit 72
0
0
1
1
Bit 53
0
1
Bit 71
0
1
0
1
The soft mute functionality is implemented to reduce the output level of the FM demodulator at
low input signal levels to limit the noise at the MPX output in this case. If the input level falls
below an adjustable threshold continuously, the output of the FM demodulator is continuously
muted with decreasing input level until a maximum mute value is reached. The threshold for the
start of soft mute and the maximum mute can be adjusted. The signal level for 3 dB mute can be
set by means of bit 68 to bit 70 and the maximum value for soft mute can be selected by bit 67.
The steepness and the time constant of the soft mute can be adjusted by the resistor and capac-
itor between pin 34 and pin 29.
The field strength signal available at pin 9 is used for soft mute. Therefore, the soft mute thresh-
old that referred to the input of the FM mixer depends on the gain from the FM mixer input to the
field strength sensor and on the setting of field strength offset (bit 15 to bit 21).
Table 4-21.
Soft Mute Threshold
14
ATR4258
Relative Soft Mute Threshold
Soft mute OFF
–18 dB
–15 dB
–12 dB
–9 dB
–6 dB
–3 dB
0 dB
Bit 70
0
0
0
0
1
1
1
1
Bit 69
0
0
1
1
0
0
1
1
Bit 68
0
1
0
1
0
1
0
1
4838B–AUDR–05/05
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