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Si47xx-EVB
5.4. FM Transmitter Main Window
The FM transmitter main window will appear after initialization.
26
7
2
1
3
4
5
8
9
13
19
18
10
11
12
14
16
15
17
25
21
22
20
24
23
6
Figure 38. FM Transmitter Main Window
Table 8. FM Transmitter Main Window Descriptions
#
Description
Range
1 Transmit frequency display. Enter the desired FM transmit frequency in this window.
2 Transmit voltage display. Enter the desired FM transmit voltage in this window.
3 Varactor Value. This is an indicator showing the tuning cap value of the Si472x device.
Each number represents 0.25 pF. If the varactor value is manually overwritten in the
property window, the indicator will change from automatic mode to manual mode.
4 RF on or off. Selecting this checkbox will enable the FM transmit, while turning this but-
ton off will disable the FM transmit.
5 Pre-Emphasis. Click one of the three buttons to set the pre-emphasis either to Off, 50 μs
or 75 μs.
6 Si472x EVB audio input setting indicator: Analog In/Digital (Analog In to CODEC)/Digital
(SPDIF).
7 Presets. Press and hold the desired preset button for 1.5 seconds to program. The cur-
rent frequency will replace the preset number. Press for less than 1.5 seconds to tune to
the displayed frequency. Presets can also be programmed automatically from the
Receive Power Scan window.
8 Pilot Tone Generation. Set to 19 kHz and select "Pilot On" when in stereo mode. Set to
0–19 kHz for and select "Pilot On" for test tone generation.
9 Audio Deviation. Enter the desired audio deviation in this window.
10 Pilot Deviation. Enter the desired pilot deviation in this window.
Rev. 0.8
76–108 MHz
88–120 dBuV
1–191
On/Off
Off, 50 μs, 75 μs
Analog, Digital
CODEC, Digital
SPDIF
76–108 MHz
0–19 kHz
0–90 kHz
0–90 kHz
43
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