Example 14 MHz, 73 into 50
Worked inputs. Not a band allocation or a coax row.
Worked example
Total length 10.1893 m / 33.4286 ft
Each leg 5.0946 m / 16.7143 ft
L_feet = 468 / f. L_meters = 142.65 / f. Leg feet = 234 / f. Leg meters = 71.325 / f.
These lengths are a formula starting point. They are not a guaranteed cut length. End effect, insulation, and height are not in the equation.
VSWR
Conditions: load 73 ohm, reference 50 ohm. Real values only. Length is not used.
Gamma 0.187
Gamma = (Z_L - Z_0) / (Z_L + Z_0)
VSWR 1.46
VSWR = (1 + |Gamma|) / (1 - |Gamma|)
Return loss 14.5635 dB
RL = -20 * log10(|Gamma|)
Reflected power 3.4966 %
P_refl = |Gamma|^2 * 100
Notes only: about 73 ohms at 180 degrees, about 58 at 120, about 50 at 90. Not interpolated.