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![]() "Ian" napisał w wiadomości ... "Szczepan Bialek" wrote in message ... Is even one textbooks where is wrote that Marconi was WRONG? Are your transmitters without any earth? I am checking from time to time if your knowledge have moved on. S* Hello Szczepan. In general, you seem to be looking at outdated techniques and technology. My radio doesn't need to be connected to ground/earth other than for static/lightning reasons. The theory and technology of radio have made a lot of progress since the time of Marconi. Hope this is of some help. Kindest regards from the UK, Ian. Hello Ian, So the earth is necessary in your radio for the static reasons. In my also: "In the lower half of the mast, there was a vertical steel tube, attached to the mast's outer structure with large insulators. This tube was grounded at the bottom, and connected electrically to the mast structure by an adjustable metal bar at 328 metres.[2] This technique allowed adjusting the impedance of the mast for the transmitter and worked by applying a DC ground at a point of low radiofrequency voltage, to conduct static charge to ground without diminishing the radio energy. Static electrical charge can build up to high values, even at times of no thunderstorm activity, when such tall structures are insulated from ground. Use of this technique provides better lightning protection than using just a spark gap at the mast feed, as is standard at most mast radiators insulated against ground." From: http://en.wikipedia.org/wiki/Warsaw_radio_tower It seems to me that the same reasons were in Marconi times. So I repeat my question: ""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."(Marconi in 1909). It is still true? S* |
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