rtl_capture.sh

#!/bin/bash
# STRF Cronjob Script
# Run with:
# rtl_capture.sh 437e6 10m

# Settings
FREQ=$1
RATE=2048e3
GAIN=32.8
WORKINGDIR=/home/pi/satobs
FIFO=$WORKINGDIR/fifo
DURATION=$2


# Cron starts this script elsewhere... CD to the right directory.
cd $WORKINGDIR

# Start channelizer
nice -20 rffft -i $FIFO -p $WORKINGDIR/data -f $FREQ -s $RATE -q -c 50 -F char &

# Start rx_samples_to_file
nice -20 rtl_sdr -g $GAIN -f $FREQ $FIFO &
RTL_PID=$!

# Sleep for the time specified
sleep $2

# Kill the rtl_sdr capture
kill $RTL_PID