Update: I added the choke at the antenna base. Before doing
that I created a
probe by wounding abt 15 turns of enamelled wire around the
coax close and
localised a point on the coax with a maximum reading close
to the shack>>
The magnetic field from common mode currents is in the form
of rings around the coax. Consider the coax an axle or axis,
the magnetic field would be a ring.
As a consequence your winding would have to be a small
spiral circling the circumference of the coax. You could not
wind it directly around the coax like the coax is a core or
you would not read what you think you are reading.
This is why the only reliable method that works is a
soft-iron core that circles the entire coax and you wind a
small winding on that core.
See:
http://www.w8ji.com/building_a_current_meter.htm
73 Tom
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|