#!/usr/bin/env python3

max_length = 100 # meters
eps = 0.4 # meters
invalid_lengths = []
valid_lengths = []

freqs = [ # Mhz
  [1.8, 2.0],		 # 160m 
  [3.5, 3.8],		 # 80m
  [7.0, 7.2],		 # 40m
  [10.1, 10.15],	 # 30m
  [14.0, 14.35],	 # 20m
  [18.068, 18.168],  # 17m
  [21.0, 21.45],	 # 15m
  [24.89, 24.99],	 # 12m
  [28.0, 29.7]	     # 10m
]

for f in freqs:
	[ ff, ft ] = f
	# print("From: %.03f, to: %.03f" % (ff, ft))
	while ff <= ft:
		ln = 0
		mult = 1
		while True:
			ln = (150/ff)*mult
			if ln > max_length:
				break
			invalid_lengths.append(ln)
			mult += 1
		ff += 0.001 # + 1kHz

ln = 10
while ln < max_length:
	valid = True
	for i in range(0, len(invalid_lengths)):
		if abs(ln-invalid_lengths[i]) < eps:
			valid = False
			break
	if valid:
		print("Valid length: %f" % (ln))
	ln += 0.1 # 10 cm