#!/usr/bin/python
import math, sys
from measure import parse_length, parse_freq
#for 50% efficency
k = 0.5
def dish_gain(wlen, diam):
tmp = math.pi * diam / wlen
return 10 * math.log10(tmp * tmp * k)
if (len(sys.argv) != 3):
print "Usage:\n{} <freq> <diam>".format(sys.argv[0])
else:
freq, wlen_in, wlen_m = parse_freq(sys.argv[1], 'frequency')
diam_in, diam_m = parse_length(sys.argv[2], 'diameter')
gain = dish_gain(wlen_m, diam_m)
print "gain: {:f} dB (assuming 50% efficency)\n".format(gain)
#!/usr/bin/python
import math, sys
from measure import parse_length, parse_freq
def loss(wlen, dist):
k = math.pi * 4
tmp = k * dist / wlen
return 20 * math.log10(tmp)
def freq_to_wlen(freq):
return light_speed / freq
if (len(sys.argv) != 3):
print "Usage:\n{} <freq> <distance>".format(sys.argv[0])
else:
dist_in, dist_m = parse_length(sys.argv[2])
freq_hz, wlen_in, wlen_m = parse_freq(sys.argv[1])
atten = loss(wlen_m, dist_m)
print "atten: {:f} dB\n".format(atten)
#!/usr/bin/python
import sys
from math import log
from measure import parse_length
def calc_L(diam_in, len_in, turns):
d = diam_in
n = turns
l = len_in
return (d*d * n*n) / (18 * d + 40 * l)
if (len(sys.argv) != 4):
print "Usage:\n{} <diam> <len> <turns>".format(sys.argv[0])
else:
diam_in, diam_m = parse_length(sys.argv[1], 'diam')
len_in, len_m = parse_length(sys.argv[2], 'len')
turns = int(sys.argv[3])
print "Diam: {:f} m, ({:f} in)".format(diam_m, diam_in)
print "Length: {:f} m, ({:f} in)".format(len_m, len_in)
print "Turns: {:d}".format(turns)
LuH = calc_L(diam_in, len_in, turns)
if (LuH < 1):
LnH = LuH * 1000.0;
print "Inductance {:f} nH".format(LnH)
else:
print "Inductance {:f} uH".format(LuH)
import sys
from math import log
from measure import parse_length
def calc_L(width_in, distance_in, length_in):
w = width_in
b = length_in
h = distance_in
# formula from ARRL handbook. NB log is ln
return 0.00508 * b * (log(2 * b / (w + h)) + 0.5 + 0.2235 * (w + h) / b)
if (len(sys.argv) != 4):
print "Usage:\n{} <track_width> <track_length> <distance>".format(sys.argv[0])
else:
width_in, width_m = parse_length(sys.argv[1], 'width')
length_in, length_m = parse_length(sys.argv[2], 'length')
distance_in, distance_m = parse_length(sys.argv[3], 'distance')
print "Width: {:f} m, ({:f} in)".format(width_m, width_in)
print "Length: {:f} m, ({:f} in)".format(length_m, length_in)
print "Distance: {:f} m, ({:f} in)".format(distance_m, length_in)
LuH = calc_L(width_in, distance_in, length_in)
if (LuH < 1):
LnH = LuH * 1000.0;
print "Inductance {:f} nH".format(LnH)
else:
print "Inductance {:f} uH".format(LuH)
