Архив за 25.06.2016

Mini Whip Active Antenna [00:02:54]

More information on my web page: http://www.qsl.net/z33t/

Excellent DIY Receiving Antena for VLF up to 20 MHz. My Mini-Whip active antennas are based on PA0RDT design with minor modifications. You can see the schematic diagrams of Mini-Whip antenna and Power Supply Unit at the end of this video. In my other videos on YouTube, you can see how good are those mini antennas in comparison with others much bigger wire antennas. Here is link where you can see pictures from my Power inserter and RF common ground Isolator for Mini-Whip active antenna powering thru the coaxial cable:
https://s5.postimg.org/q8lh68lxz/Power_Inserter_and_RF_isolator_Small_6.jpg

https://s5.postimg.org/4ap0cg6xj/Power_Inserter_and_RF_isolator_8_small.jpg

Mini Whip is excellent and cheap DIY active antenna.
Especially for lower frequencies! (VLF up to lower HF bands)

Some people who report poor performance of this antenna did not followed the rules of proper installation!
Grounding the outer conductor (shield) of the coaxial cable has to be done properly!
Coaxial cable is part of Mini-Whip antenna and collect a lot of RF noise.
You can treat Mini-Whip antenna as a vertical antenna feeding at the top where the impedance is very high. Outer conductor of the coaxial cable must be grounded at the bottom of antenna, where the coaxial cable touching the ground, and the second grounding have to be done at the point just before coaxial cable entering in the house.
The RF isolating transformer is recommend also.
In that way receiver ground is not physically connected to antenna ground but it is galvanic isolated from outer shield of coaxial cable.
All this measures is not difficult to implement and cost almost no money, but the benefit is clear, noiseless VLF and HF reception!

Mini-Whip antenna must be placed as far as possible from houses, buildings and power lines!

Here is the link of my Youtube video, where you can see my homemade Mini-Whip antennas in my backyard:

https://www.youtube.com/watch?v=L-1V9t5tdhk

73,
Mile Kokotov, Z33T

Перевод
Рубрики
Архивы
Июнь 2016
Пн Вт Ср Чт Пт Сб Вс
« Май   Июл »
 12345
6789101112
13141516171819
20212223242526
27282930