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Si47xx-EVB
Table 14. FM Receiver Main Window Descriptions
#
1
2
3
4
5
6
Name
Tune/Seek
Freq Slider,
AFC Rail Indicator,
Mono/Stereo
Indicator,
Pilot Indicator,
Stereo Blend
Indicator,
Valid Indicator
Volume, Mute
Auto Scan,
To Preset,
Select Stn
Presets
RSSI/SNR/
Multipath/Stereo/Hi-
Cut/SoftMute
Descriptions
Tune Down (<), Tune Up (>) buttons execute a single channel step according to the
channel spacing setting. The channel spacing setting can be set in the property window.
Seek down (<<), Seek Up (>>) buttons execute a seek up or down to the next received
FM signal meeting or exceeding the seek settings within the selected band. The seek
setting Received Signal Strength Indicator (RSSI) and Signal to Noise Ratio (SNR)
threshold can be set in the property window.
The Frequency Display indicates the frequency in MHz. To change the Frequency, drag
the pointer in the Frequency Slider Bar to the desired frequency. The frequency may also
be changed by changing the value in the display.
AFC Rail indicator will be red if the tuned frequency is in an AFC rail state, otherwise the
indicator will be grey.
The Mono/Stereo indicator will switch to stereo if the blend ratio is greater than 0 and the
Pilot is present.
The Pilot indicator will be green if the received FM signal has a pilot signal.
The Stereo Blend indicator will be green if the part goes into linear blend between stereo
and mono. Full mono is indicated by 0% and full stereo is indicated by 100%.
The Valid indicator will be green if the FM frequency meets the RSSI and SNR seek
settings in the property window.
Select the Si47xx output volume (0-63) by moving the slider bar pointer. Press the Mute
button to mute the Si47xx radio. If the radio is muted, the button will be red. Press the
Mute button again to remove the muting.
The Auto Scan button will find all the stations with an RSSI and SNR above the seek
settings in the property window. After the scan is completed, the number of stations
found will be displayed and each station will be available in the drop down box. Also, a
red indicator mark will be displayed on the Frequency Slider Bar (2) for each station. The
"To Presets" Button will program the preset buttons (5) with the 12 strongest stations.
Press the desired button to tune to the frequency displayed on the button. To store a new
value to the preset button, tune to the desired frequency and then press and hold the
desired button for 1.5 seconds. The button will then change to indicate the stored
frequency.
The RSSI indicator displays the RSSI of the signal in dBuV.
The SNR indicator displays the SNR of the received signal in dB.
The Multipath indicator will be green if Multipath is detected. This indicator is only
available in Si474x products. Refer to Figure 60.
The Stereo Blend indicator will be green if the part goes into linear blend between stereo
and mono. Full mono is indicated by 0% and full stereo is indicated by 100%.
The Hi-Cut indicator will indicate the percentage of hi-cut being applied to the audio
signal. This indicator is only available in Si4742/43/44/45 products. Refer to Figure 60.
The Soft Mute indicator will indicate the amount of attenuation in dB applied to the audio
signal.
Rev. 0.8
63
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