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Приемные VLF антенны Paul Nicholson
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rn3aus:
Многим из нас будет интересно посмотреть на приемную установку диапазона сверхдлинных волн, изготовленную Paul Nicholson.
В ответ на мою просьбу Paul любезно предоставил нам описание, фотографии и схемы.
--- Цитировать ---Hi Alex,
> yes indeed, this is the first reception of a VLF signal from
> Russia in the UK so far!
Thanks, I updated the list
http://abelian.org/vlf/amateur-radio/
> could you give us a short description of your receiving system,
> it would be especially interesting to see the circuits of
> low-noise amplifiers for electric and magnetic antennas.
Sure. Below, some links to the hardware for you to use.
E-field antenna: 2m x 4cm tube (water pipe) stuffed with wire
and acoustic ballast/damping. Base is about 2m above ground,
effective height 1.6m.
http://abelian.org/vlf/tmp/170813a.jpg
E-field pre-amp AD823,
http://abelian.org/vlf/prx-e1-1.pdf
which is located inside the base of the antenna tube.
http://abelian.org/vlf/tmp/171129a.jpg
http://abelian.org/vlf/tmp/171129b.jpg
A few metres away from the antenna is a box with a line driver
and power supply for the pre-amp.
--- Цитировать ---http://abelian.org/vlf/tmp/171130a.jpg
--- Конец цитаты ---
http://abelian.org/vlf/tmp/171130a.jpg
Pre-amp on the left, PSU/driver box on the right.
http://abelian.org/vlf/tmp/171127a.jpg
A cat5 cable delivers 48V DC to power everything and a balanced
twisted pair downlinks the VLF signal. DC supply pair and VLF
pair are isolated at both ends of the cable so there is no
ground loop.
H-field antenna: Orthogonal rectangular loops 20m by 2m by 3 turns
(heavy duty mains cable), about 1 ohm and 370uH.
http://abelian.org/vlf/p1010111r.jpg
http://abelian.org/vlf/p1010102r.jpg
2-channel pre-amp, power conversion, and line driver all in one
big box.
http://abelian.org/vlf/tmp/171216a.jpg
(The little box on the left is for amplitude calibration.)
Each channel has pre-amp circuit
http://abelian.org/vlf/prx-h1-sim1.pdf
and the two line drivers are the same LT1010 circuit as used on
the E-field.
Again, cat5 with 48V DC on one pair and VLF signal on two other pairs.
All pairs isolated at both ends.
--
Paul Nicholson
--
--- Конец цитаты ---
rw3adb:
Спасибо, Саш!
Очень интерестно и полезно!
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