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Si47xx-EVB
Table 8. FM Transmitter Main Window Descriptions (Continued)
#
Description
Range
11 RDS Deviation. Enter the desired RDS deviation in this window (Si4711/13/21 only).
12 Total Deviation. This is an indicator only displaying the sum of the audio, pilot and RDS
deviation. If the total deviation exceeds 75 kHz, the indicator will turn red and a warning
sign is displayed.
13 Input Mute Left/Right. Selecting this checkbox will mute the Left or Right audio channel.
14 Turn on or off the pilot tone for stereo or mono FM transmit mode.
15 Turn on or off the RDS transmission (Si4711/13/21 only).
16 Modulation On. Selecting this checkbox will modulate the audio, pilot, and RDS signal
according to the audio, pilot, and RDS deviation. De-selecting this checkbox will turn off
modulation for all audio, pilot, and RDS signal and only the carrier will be transmitted.
17 Turn on or off the L-R channel for stereo or mono FM transmit mode.
18 Turn on or off the compressor for the audio signal.
19 Attack time. Set the attack time for the compressor in milliseconds.
20 Release time. Set the release time for the compressor in milliseconds.
21 Threshold. Set the threshold for the compressor.
22 Input Gain. Set the compressor gain.
23 Limiter Release Time. Set the limiter release time constant.
(Not available in Si4710-A10).
24 Turn on or off the limiter feature.
25 Audio Level Indicators. Overmodulation, Limiter, Audio input level below low-level
threshold (silence detection), and Audio input level below high-level threshold (loud
detection). To enable these four indicators, check the Enable Interrupts box. These
indicators are sticky; to clear them, click the Reset button.
26 Mode switch buttons to switch between different modes on the device. See section 4 for
more information.
0–7.5 kHz
0–187.5 kHz
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
0.5–5 ms
100–1000 ms
–40 to 0 dBFS
0 to 20 dB
0.5,1,2,3,4,5,6,7,8,
9,10,20,30,40,50,
75,100 ms
On/Off
44
Rev. 0.8
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