Hello J,

Thursday, September 10, 2009, 1:10:41 AM, you wrote:

> On Wed, 9 Sep 2009 13:55:11 +0200, J.F. wrote:
>>Użytkownik "RoMan Mandziejewicz" <r...@p...pl> napisał w
>>> A niby do czego to uziemienie, skoro jakikolwiek przewód robiłby
>>> za dodatkową antenę?
>>
>>Ja tego nie wymyslilem, tylko gdzies wyczytalem [i nie moge znalezc
>>gdzie].

> http://en.wikipedia.org/wiki/Warsaw_radio_mast

> 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 at half the total height. This technique works by
> applying a DC ground at a point of minimum radiofrequency voltage,
> conducting 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 a better
> lightning protection than using just a spark gap at the mast feed,
> which is standard at most mast radiators insulated against ground.

Widzisz na zdjęciach stalową rurę w środku? Natomiast pod zdjęciem
masz jak wół: "Mast radiator insulated against ground"

--
Best regards,
RoMan mailto:r...@p...pl
Spam: http://www.allegro.pl/sklep/7416823_squadack :)