форум Радиолюбительского ДВ портала > ДВ антенны
Измерение антенного тока
rw3adb:
В РСГБ проходит тема, не знаю, насколько она будет нам полезна, но все же решил запиcать у нас тут.
Стефан DK7FC предлагал использовать катушку Роговского для измерния антенного тока, насколько я понял, она вообще для другого предназначена.
Попутно, ему выдали пару ссылок и советов.
Возможно, пригодится кому-то из нас тут.
LF: Rogowski-coils for RF measurements
Hi all,
Has someone ever build (homemade, not bought!) a Rogowski-coil for RF
current measurements?
https://en.wikipedia.org/wiki/Rogowski_coil
It could be used to measure leakage currents in a tower near the antenna
wire for example. Or for measuring RF currents into a pole of a guide
rail, for example :-)
I'm planning to build one and i thought i use 0.4 mm diameter enameled
cu wire arround a graden hose, having 0.6m circumference. Then some
shrinking tube will be applied. That's the plan.
The circuit looks easy, it should be run from a 9V battery and a simple
TL081 for example. The output could be adapted to a multimeter, so there
is a digital read-out.
I'm curious to see how it works...
73, Stefan
============================
WD2XDJ:
Stefan,
See John Andrew's web page :
http://www.w1tag.com/RFA.htm
73 Warren
============================
Hello Stephane!
Maybe this could help you:
http://www.uqac.ca/dsa/archives/projets/2010/conception/rapportFinal/RapFinal_2010-193.pdf
(Limited to ~300 KHz)
73: Jeff F6CWN
============================
Stephan and all,
You might be interested in the following, although not Rogowski type,
a cut toroidal core, clamp-type, current transformer + rectifier.
You need a high-impedance voltmeter. A normal handy one will do.
You obtain absolute values, accuracy +-20% (or better).
I developed the HF version in circa 2002, and the LF version in 2011.
Distributed as kit and finished version, sold about 4000.
Fun to observe RF currents on coax-shield, rotator-cable, AC-cables,
VHF coax while transmitting at HF, LF...,
Probably too small to measure towers: inner-diameter is about 22mm.
websites in Japanese, sorry, but see the pictures.
HF:
https://www.ddd-daishin.co.jp/e-kousaku/d-rf-current/ver2/index.htm
1.8-54MHz, 10mA-300mA, (accuracy +-20%)
10:1 (1000mV is 100mA)
LF:
https://www.ddd-daishin.co.jp/e-kousaku/d-rf-current/ver2/lf/lf-part-set.htm
135kHz-4MHz, 0.05-2A, (accuracy +-20% )
1:1 (1V is 1A)
Hideho YAMAMURA, Ph.D, JF1DMQ
rn3aus:
Some first measurements:
Diameter: 0.3 m.
R (DC): 17 Ohm.
Inductivity (measured at ~ 1 kHz): 1.62 mH
Self resonance: 734 kHz
Сергей UB1APE:
Ой! а я и не знал что такое катушка Роговского...
UF4A:
Приехала вчера такая штука Т210-1-М1. Померял ток в своей антенне, получилось 5А при потреблении усилителем 10А и 7А при 30А.
rw3adb:
--- Цитата: UF4A от 17 Март 2022, 12:05:20 ---получилось 5А при потреблении усилителем 10А и 7А при 30А.
--- Конец цитаты ---
получилось 5А при потреблении усилителем 10А и 7А при 30 В(?).
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