Home |
Search |
Today's Posts |
#15
|
|||
|
|||
The earth
"Szczepan Bialek" wrote in message .. . " Not dobled but doubled (twice as large). It is desribed by Lodge: See Fig.2 : http://www.antiquewireless.org/otb/lodge1102.htm "The electrical waves produced by the oscillations at A traveled along the wires and were reflected at the far ends. Lodge knew that the longer spark at B3 was due to what he called the "recoil impulse" or "recoil kick" at the end of the wires where the waves were reflected.[4] At spark gap B3 both the incident wave and the reflected wave had their maximum values and were in phase. This produced a voltage twice as large as the voltage at spark gap A." "Tesla discovered that the one end of the dipole must be earthed to have the strong waves." This is definitely something that I will not be doing. A dipole has low impedance at the feed point and high impedance at its ends. A dipole with one ene earthed becomes a monopole. Hertz transmitter is a dipole. The Tesla's is a monopole. Todays dipoles are simply the two monopoles. Thanks this the waves are polarized. But the question is if Marconi was right:" "The necessity or utility of the earth connection has been sometimes questioned, but in my opinion no practical system of wireless telegraphy exists where the instruments are not connected to earth." Best regards, S* Hello again Szczepan . You used the term "dobled". Was it a typing error on your part? Are we discussing spark transmission and non-resonant aerials? Regards, Ian. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Earth To GWB! | Shortwave | |||
Earth To GWB! | Shortwave | |||
Earth To GWB! | Shortwave | |||
CALCULATION OF EARTH RESISTANCE IN MULTI-LAYER EARTH STRUCTURE | Antenna | |||
CALCULATION OF EARTH RESISTANCE IN MULTI-LAYER EARTH STRUCTURE | Equipment |