Hi Edgar,
The probe is grounded directly on the aluminium tube which holds the
probe. But in a next step i want to move this grounding point 70cm away
from the probe, i.e. directly on the pole. Maybe there is a galvanic
coupling which runs some current in a loop out of coax and mast. This
loop may now be to close to the circuit and may induce a H field in the
structure. I use a common mode choke in series to the coax but its
common mode reduction is not infinity for all frequencies. Maybe there
are even some resonances... It becomes complex :-)
73, Stefan/DK7FC
Am 07.10.2012 13:13, schrieb Edgar J Twining:
Hi Stefan,
Following Grahams
comments.
1. What is the ground for you
antenna?
2. Is the steel ladder/ frame
work next to the antenna pole re-radiating any signals?
Regards Edgar
Moonah, Tasmania.
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