Dipoles / by Brian Lambert

I made this chart from a spreadsheet I wrote containing common dipole calculations.

Here's the spreadsheet on github.com.

There are numerous online dipole calculators. Since the bands in Amateur Radio don't change very frequently, the chart below shows calculations for each Amateur Radio band and, in the case of 28.0 MHz - 29.7 MHz (10 Meters) and 3.5 MHz - 4.0 MHz (80 Meters / 75 Meters), segments of the bands since these bands are so large.

Additionally, the chart shows the Flat Top dimensions and Inverted V dimensions, which are calculated to be 5% shorter than the the Flat Top dimensions.

Band Start End Bandwidth Center Flat Top Each Side Inverted V Each Side
10 Meters 28.000 MHz 29.700 MHz 1.700 MHz 28.850 MHz 16.22 ft 8.11 ft 8 ft 1 in 15.41 ft 7.71 ft 7 ft 8 in
CW 10 Meters 28.000 MHz 28.300 MHz 300 kHz 28.150 MHz 16.63 ft 8.31 ft 8 ft 4 in 15.79 ft 7.90 ft 7 ft 11 in
Phone 10 Meters 28.300 MHz 29.700 MHz 1.400 MHz 29.000 MHz 16.14 ft 8.07 ft 8 ft 1 in 15.33 ft 7.67 ft 7 ft 8 in
12 Meters 24.890 MHz 24.990 MHz 100 kHz 24.940 MHz 18.77 ft 9.38 ft 9 ft 5 in 17.83 ft 8.91 ft 8 ft 11 in
15 Meters 21.000 MHz 21.450 MHz 450 kHz 21.225 MHz 22.05 ft 11.02 ft 11 ft 0 in 20.95 ft 10.47 ft 10 ft 6 in
17 Meters 18.068 MHz 18.168 MHz 100 kHz 18.118 MHz 25.83 ft 12.92 ft 12 ft 11 in 24.54 ft 12.27 ft 12 ft 3 in
20 Meters 14.000 MHz 14.350 MHz 350 kHz 14.175 MHz 33.02 ft 16.51 ft 16 ft 6 in 31.37 ft 15.68 ft 15 ft 8 in
30 Meters 10.100 MHz 10.150 MHz 50 kHz 10.125 MHz 46.22 ft 23.11 ft 23 ft 1 in 43.91 ft 21.96 ft 21 ft 11 in
40 Meters 7.000 MHz 7.300 MHz 300 kHz 7.150 MHz 65.45 ft 32.73 ft 32 ft 9 in 62.18 ft 31.09 ft 31 ft 1 in
80 Meters 3.500 MHz 4.000 MHz 500 kHz 3.750 MHz 124.80 ft 62.40 ft 62 ft 5 in 118.56 ft 59.28 ft 59 ft 3 in
A 75 Meters 3.800 MHz 4.000 MHz 200 kHz 3.900 MHz 120.00 ft 60.00 ft 60 ft 0 in 114.00 ft 57.00 ft 57 ft 0 in
A 80 Meters 3.500 MHz 3.800 MHz 300 kHz 3.650 MHz 128.22 ft 64.11 ft 64 ft 1 in 121.81 ft 60.90 ft 60 ft 11 in
B 75 Meters 3.600 MHz 4.000 MHz 400 kHz 3.800 MHz 123.16 ft 61.58 ft 61 ft 7 in 117.00 ft 58.50 ft 58 ft 6 in
B 80 Meters 3.500 MHz 3.600 MHz 100 kHz 3.550 MHz 131.83 ft 65.92 ft 65 ft 11 in 125.24 ft 62.62 ft 62 ft 7 in
160 Meters 1.800 MHz 2.000 MHz 200 kHz 1.900 MHz 246.32 ft 123.16 ft 123 ft 2 in 234.00 ft 117.00 ft 117 ft 0 in

In the coming months I will be building several of these dipole antennas for the N1IK station. I'll be writing blog posts about my experiences.

73 de N1IK