User guide

Si471x-EVB
Preliminary Rev. 0.4 19
6. Development Using Si471x GUI (Firmware 1.B)
6.1. Si47xx GUI - Main Window
Figure 20. Si471x FM Transmitter Window
Table 2. Control Bit Explanations
# Explanation Range
1
Transmit frequency display. Enter the desired FM transmit frequency in this window.
76–108 MHz
2
Transmit power display. Enter the desired FM transmit power in this window.
88–120 dBuV
3
RF on or off. Turning this button on will enable the FM transmit, while turning this button
off will disable the FM transmit.
On/Off
4
Varactor Value. This is an indicator showing the tuning cap value of the Si471x chip.
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.
1–191
5
Audio Deviation. Enter the desired audio deviation in this window.
0–90 kHz
6
Pilot Deviation. Enter the desired pilot deviation in this window.
0–90 kHz
7
RDS Deviation. Enter the desired RDS deviation in this window (Si4711/13 only).
0–7.5 kHz
8
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.
0–187.5 kHz
9
Input Mute Left/Right. Turning this button will mute the Left or Right audio channel.
On/Off
10
Turn on or off the pilot tone for stereo or mono FM transmit mode.
On/Off
11
Turn on or off the L-R channel for stereo or mono FM transmit mode.
On/Off
12
Turn on or off the RDS transmission (Si4711/13 only).
On/Off
13
Modulation On. Clicking this button on will modulate the audio, pilot, and RDS signal
according to the audio, pilot, and RDS deviation. Turning this button off will turn off mod-
ulation for all audio, pilot, and RDS signal.
On/Off
5
1
2
3
6
7
8
9
10
17
1615
14
13
11
12
18
19
20
4
21
22
23