For those initiated, some words about it below:
The radio was initially equipped with just a 10meters long aerial. It had some coupling (3meter long wire for counterweight, for example etc.), but did not have any tuning. Neither wa sit with any sufficient length. As the frequency we are receiveing is 4.625MHz, it will make the wavelength of 71m, which makes any decent antenna on that frequency at least 71/2=35.5 meters long.
The other problem was noise. The signal received was not that bad, but it was overcrowded with all sorts of urban noise (worst of it radiating from plasma TV back to the mains cord!).
I spent about a week with my three shortwave antenna books, and finally decided to give a try on magnetic loop, before I start climbing on the neighbours roof.
The result - two nights of building and ... the result is really amazing. It is not that much more sensitive han the long wire was, but it has two stunning propoerties: First - it has almost no noise, as it is tuned to exactly the right frequency. Second -it has excellent directional characteristics. Which is of course why these types of antennas were used for directinal radio navigation for ships and military all the way until mid-80s.
I will post the details for the antenna here later. This antenna is not suitable for random shortwave hopping, as you have to tune it and turn it for the exact bearing and frequency to make it work.
However, if you know the frequency and know what direction it is, I would definitely recommend building one! I can not imagine anything else for 80m band fitting in your room and giving even remotely the same result!
kích xung quanh thân thể khổng lồ của Yêu Huyên.
ReplyDelete- Ầm.
Một quang mang vô cùng lớn bao phủ bạo phá ở trên không trung, giống như là sấm sét vậy.
- Ầm ầm.
Ngay sau đó điện trụ thứ hai và điện trụ thứ ba cũng xuất hiện không ngừng công kích từ trên không trung, dưới điện trụ mạnh mẽ này, thân thể Kim Tiên Khôi Lỗi dongtam
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trung tâm ngoại ngữcủa Yêu Huyên cũng chỉ có thể miễn cưỡng chống lại mà thôi.
- Yêu Huyên gây nên địa kiếp này thật là mạnh mẽ.
Nhạc Thành thở ra một hơi, bây giờ địa kiếp xung quanh đã tràn ngập một khí tức cường hãn rồi.
- Rốt cuộc cũng đã xong.
Dưới địa kiếp không ngừng này, Yêu Cơ, Khiếu Thiên Hổ, Tứ Sí Ma Ưng Tử Điện Mãng tựa hồ như đang ở giai đoạn cuối.
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