Bash script for random wspr transmissions

[mark-orion]

Not an issue but I would like to share this little bash script that I use to run wspr on a Pi Zero. The important thing is the MAXWAIT variable. Here you define the maximum time (in seconds) between activations of the wspr program. This allows for a "polite" beacon that does not overload the band with transmissions.
Important: This script works only with Bash or shells that support the $RANDOM variable.
enjoy, 73 de MM0DQM, Mark

#!/bin/bash
CALL=YourCall
GRID=YourGrid
PWR=10
FRQ=20m
MAXWAIT=240
sudo systemctl stop systemd-timesyncd
while :; do
echo "Synchronizing Time"
sudo ntpdate -b -p8 pool.ntp.org
sudo wspr --terminate 1 --offset --self-calibration $CALL $GRID $PWR $FRQ
NUMBER=$RANDOM
let "NUMBER %= $MAXWAIT"
echo "Waiting $NUMBER seconds..."
sleep $NUMBER
done