Quote:
Originally Posted by G8HQP Dave
Quote:
|
as to SWR, it is often overlooked that a dipole has an impedance of 73 ohms and the coax is 50 ohm so 75/50 = near 1.5 to 1 is the best real SWR that should be expected, anything up to 2-1 is fine.
|
A resonant dipole in free space has an impedance of 73 ohms. Near the ground (and most amateur antennas are near the ground) it will be different, probably lower than 73 ohms. |
Yes Dave ground to antenna wire capacitance effect, depend on the type of ground and height above ground BUT does not change a great deal, many many test have revealed that decades ago but often as you say forgotten.
too much made about looking for a perfect 1-1 SWR, in reality not possible unless one uses a tuner to fake it.