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Do a proper calculation of the required SDR tuning offset, based on fsk_demod's acquistion range.

pull/2/head
Mark Jessop 2018-12-22 14:17:27 +10:30
rodzic bb6c5c915f
commit d9d0fc00ed
1 zmienionych plików z 7 dodań i 5 usunięć
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start_rx.sh
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@ -54,9 +54,7 @@ RX_FLOW=IQ
# Modem Settings - Don't adjust these unless you really need to! # Modem Settings - Don't adjust these unless you really need to!
# #
BAUD_RATE=115177 # Baud rate, in symbols/second. BAUD_RATE=115177 # Baud rate, in symbols/second.
OVERSAMPLING=8 # FSK Demod Oversampling rate OVERSAMPLING=8 # FSK Demod Oversampling rate. 8X oversampling works best for 115k FSK
TUNING_OFFSET=200000 # SDR Tuning Offset, in Hz, to centre the Wenet signal in the fsk demod passband.
# 200 kHz is about right for a 'standard' 115k Wenet TX signal
# #
# Main Script Start... Don't edit anything below this unless you know what you're doing! # Main Script Start... Don't edit anything below this unless you know what you're doing!
@ -73,10 +71,14 @@ python TelemetryGUI.py $MYCALL &
# Calculate the SDR sample rate required. # Calculate the SDR sample rate required.
SDR_RATE=$(($BAUD_RATE * $OVERSAMPLING)) SDR_RATE=$(($BAUD_RATE * $OVERSAMPLING))
# Calculate the SDR centre frequency # Calculate the SDR centre frequency.
RX_SSB_FREQ=$(($RXFREQ - $TUNING_OFFSET)) # The fsk_demod acquisition window is from Rs/2 to Fs/2 - Rs.
# Given Fs is Rs * Os (Os = oversampling), we can calculate the required tuning offset with the equation:
# Offset = Fcenter - Rs*(Os/4 - 0.25)
RX_SSB_FREQ=$(echo "$RXFREQ - $BAUD_RATE * ($OVERSAMPLING/4 - 0.25)" | bc)
echo "Using SDR Sample Rate: $SDR_RATE Hz" echo "Using SDR Sample Rate: $SDR_RATE Hz"
echo "Using SDR Centre Frequency: $RX_SSB_FREQ Hz"
if [ "$BIAS" = "1" ]; then if [ "$BIAS" = "1" ]; then
echo "Enabling Bias Tee" echo "Enabling Bias Tee"