April 12th 12, 10:24 AM
posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Dec 2008
Posts: 375
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The earth
Szczepan Bialek wrote:
"Rob" napisal w wiadomosci
...
Szczepan Bialek wrote:
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.
You have a big problem with comprehending, don't you?
Earlier you wrote that Marconi said that a capacitive coupling to ground
was good for HF grounding and now you want DC coupling to discharge
static electricity. Those two reasons for grounding are completely
different.
Each capacitor has the big surfaces and imperfect insulator between them.
Is it the "DC coupling to discharge static electricity"?
No.
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