diff --git a/start_eight_4fsk.sh b/start_eight_4fsk.sh
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+#!/usr/bin/env bash
+#
+#   Horus Binary *Eight-way* Decoder Script
+#   Intended for situations with up to eight payloads in the air, spaced 5 kHz apart.
+#   NOTE - Ensure your horus_demod build is from newer than ~5th April 2024, else this
+#   will not work correctly!
+#
+#   Note: Don't try this with DFM17's.  They have significant frequency drift and may 
+#   interfere with adjoining payloads.
+#
+# The *centre* frequency of the SDR Receiver, in Hz.
+# Trackers should be programmed at 5khz intervals, starting 2.5khz above, and below the center 
+# frequency.
+# In this example we set the center frequency to 432.622.500.  Tracker frequencies should
+# be programmed at 432.605.000 - 432.640.000 at 5khz intervals
+
+# Center Frequency 
+RXFREQ=432622500
+
+
+# Change directory to the horusdemodlib directory.
+# If running as a different user, you will need to change this line
+cd /home/pi/horusdemodlib/
+
+# Where to find the first signal - in this case at 432.605 MHz, so -17500 Hz below the centre.
+MFSK1_SIGNAL=-17500
+
+# Where to find the second signal - in this case at 432.610 MHz, so -12500 Hz below the centre.
+MFSK2_SIGNAL=-12500
+
+# Where to find the third signal - in this case at 432.615 MHz, so -7500 Hz below the centre.
+MFSK3_SIGNAL=-7500
+
+# Where to find the fourth signal - in this case at 432.620 MHz, so -2500 Hz below the centre.
+MFSK4_SIGNAL=-2500
+
+# Where to find the fifth signal - in this case at 432.625 MHz, so 2500 Hz above the centre.
+MFSK5_SIGNAL=2500
+
+# Where to find the sixth signal - in this case at 432.630 MHz, so 7500 Hz above the centre.
+MFSK6_SIGNAL=7500
+
+# Where to find the seventh signal - in this case at 432.635 MHz, so 12500 Hz above the centre.
+MFSK7_SIGNAL=12500
+
+# Where to find the eighth signal - in this case at 432.640 MHz, so 17500 Hz above the centre.
+MFSK8_SIGNAL=17500
+
+# Frequency estimator bandwidth. The wider the bandwidth, the more drift and frequency error the modem can tolerate,
+# but the higher the chance that the modem will lock on to a strong spurious signal.
+RXBANDWIDTH=5000
+
+# RTLSDR Device Selection
+# If you want to use a specific RTLSDR, you can change this setting to match the 
+# device identifier of your SDR (use rtl_test to get a list)
+SDR_DEVICE=0
+
+# Receiver Gain. Set this to 0 to use automatic gain control, otherwise if running a
+# preamplifier, you may want to experiment with different gain settings to optimize
+# your receiver setup.
+# You can find what gain range is valid for your RTLSDR by running: rtl_test
+GAIN=0
+
+# Bias Tee Enable (1) or Disable (0)
+# NOTE: This uses the -T bias-tee option which is only available on recent versions
+# of rtl-sdr. Check if your version has this option by running rtl_fm --help and looking
+# for it in the option list.
+# If not, you may need to uninstall that version, and then compile from source: https://github.com/osmocom/rtl-sdr
+BIAS=0
+
+# Receiver PPM offset
+PPM=0
+
+# Check that the horus_demod decoder has been compiled.
+DECODER=./build/src/horus_demod
+if [ -f "$DECODER" ]; then
+    echo "Found horus_demod."
+else 
+    echo "ERROR - $DECODER does not exist - have you compiled it yet?"
+	exit 1
+fi
+
+# Check that bc is available on the system path.
+if echo "1+1" | bc > /dev/null; then
+    echo "Found bc."
+else 
+    echo "ERROR - Cannot find bc - Did you install it?"
+	exit 1
+fi
+
+# Use a local venv if it exists
+VENV_DIR=venv
+if [ -d "$VENV_DIR" ]; then
+    echo "Entering venv."
+    source $VENV_DIR/bin/activate
+fi
+
+
+# Calculate the frequency estimator limits for each decoder
+MFSK1_LOWER=$(echo "$MFSK1_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK1_UPPER=$(echo "$MFSK1_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK1_CENTRE=$(echo "$RXFREQ + $MFSK1_SIGNAL" | bc)
+
+MFSK2_LOWER=$(echo "$MFSK2_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK2_UPPER=$(echo "$MFSK2_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK2_CENTRE=$(echo "$RXFREQ + $MFSK2_SIGNAL" | bc)
+
+MFSK3_LOWER=$(echo "$MFSK3_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK3_UPPER=$(echo "$MFSK3_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK3_CENTRE=$(echo "$RXFREQ + $MFSK3_SIGNAL" | bc)
+
+MFSK4_LOWER=$(echo "$MFSK4_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK4_UPPER=$(echo "$MFSK4_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK4_CENTRE=$(echo "$RXFREQ + $MFSK4_SIGNAL" | bc)
+
+MFSK5_LOWER=$(echo "$MFSK5_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK5_UPPER=$(echo "$MFSK5_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK5_CENTRE=$(echo "$RXFREQ + $MFSK5_SIGNAL" | bc)
+
+MFSK6_LOWER=$(echo "$MFSK6_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK6_UPPER=$(echo "$MFSK6_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK6_CENTRE=$(echo "$RXFREQ + $MFSK6_SIGNAL" | bc)
+
+MFSK7_LOWER=$(echo "$MFSK7_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK7_UPPER=$(echo "$MFSK7_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK7_CENTRE=$(echo "$RXFREQ + $MFSK6_SIGNAL" | bc)
+
+MFSK8_LOWER=$(echo "$MFSK8_SIGNAL - $RXBANDWIDTH/2" | bc)
+MFSK8_UPPER=$(echo "$MFSK8_SIGNAL + $RXBANDWIDTH/2" | bc)
+MFSK8_CENTRE=$(echo "$RXFREQ + $MFSK6_SIGNAL" | bc)
+
+echo "Using SDR Centre Frequency: $RXFREQ Hz."
+echo "Using MFSK1 estimation range: $MFSK1_LOWER - $MFSK1_UPPER Hz"
+echo "Using MFSK2 estimation range: $MFSK2_LOWER - $MFSK2_UPPER Hz"
+echo "Using MFSK3 estimation range: $MFSK3_LOWER - $MFSK3_UPPER Hz"
+echo "Using MFSK4 estimation range: $MFSK4_LOWER - $MFSK4_UPPER Hz"
+echo "Using MFSK5 estimation range: $MFSK5_LOWER - $MFSK5_UPPER Hz"
+echo "Using MFSK6 estimation range: $MFSK6_LOWER - $MFSK6_UPPER Hz"
+echo "Using MFSK7 estimation range: $MFSK7_LOWER - $MFSK7_UPPER Hz"
+echo "Using MFSK8 estimation range: $MFSK8_LOWER - $MFSK8_UPPER Hz"
+
+BIAS_SETTING=""
+
+if [ "$BIAS" = "1" ]; then
+	echo "Enabling Bias Tee."
+	BIAS_SETTING=" -T"
+fi
+
+GAIN_SETTING=""
+if [ "$GAIN" = "0" ]; then
+	echo "Using AGC."
+	GAIN_SETTING=""
+else
+	echo "Using Manual Gain"
+	GAIN_SETTING=" -g $GAIN"
+fi
+
+STATS_SETTING=""
+
+if [ "$STATS_OUTPUT" = "1" ]; then
+	echo "Enabling Modem Statistics."
+	STATS_SETTING=" --stats=100"
+fi
+
+# Start the receive chain.
+# Note that we now pass in the SDR centre frequency ($RXFREQ) and 'target' signal frequency ($MFSK1_CENTRE)
+# to enable providing additional metadata to SondeHub
+rtl_fm -M raw -F9 -d $SDR_DEVICE -s 48000 -p $PPM $GAIN_SETTING$BIAS_SETTING -f $RXFREQ \
+  | tee >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK1_LOWER --fsk_upper=$MFSK1_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK1_CENTRE ) \
+  | tee >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK2_LOWER --fsk_upper=$MFSK2_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK2_CENTRE ) \
+  | tee >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK3_LOWER --fsk_upper=$MFSK3_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK3_CENTRE ) \
+  | tee >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK4_LOWER --fsk_upper=$MFSK4_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK4_CENTRE ) \
+  | tee >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK5_LOWER --fsk_upper=$MFSK5_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK5_CENTRE ) \
+  | tee >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK6_LOWER --fsk_upper=$MFSK6_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK6_CENTRE ) \
+  | tee >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK7_LOWER --fsk_upper=$MFSK7_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK7_CENTRE ) \
+  >($DECODER -q --stats=5 -g -m binary --fsk_lower=$MFSK8_LOWER --fsk_upper=$MFSK8_UPPER - - | python -m horusdemodlib.uploader --freq_hz $RXFREQ --freq_target_hz $MFSK8_CENTRE ) > /dev/null
+