pi-scripts/dipole

#!/bin/bash


#determine dipole length
#20200329 km4ack

FREQ=$(yad --form --width=400 --text="<b>1/2 Wave Dipole Calculator</b> by KM4ACK" --text-align=center --center --title="Dipole Calculator" \
--field="Desired Frequency?" "7.200" \
--button=Quit:1 \
--button=Calculate:2)

if [ $? = 1 ]; then
exit
fi

FREQ=$(echo $FREQ | awk -F "|" '{print $1}')
LEN=$(awk "BEGIN {print 234/$FREQ}")
TOTAL=$(awk "BEGIN {print 468/$FREQ}")
LEN1=$(echo $LEN | sed 's/.*\.//')
FEET=$(echo $LEN | sed 's/\..*$//')
INCH=$(awk "BEGIN {print .$LEN1*12}")
ROUND=$(printf "%.0f\n" $INCH)
ANS="$FEET feet $ROUND inches long"

yad --center --width=400 --wrap --title="Dipole Calculator" --text="<b>Length of Dipole</b>" --text-align=center \
--form --separator="|" --item-separator="," \
--field="Each Leg":RO "$ANS" \
--field="Total Length":RO "$TOTAL feet" \
--button=gtk-quit:1