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Re: LF: GRRRRR!! Now i know...

To: [email protected]
Subject: Re: LF: GRRRRR!! Now i know...
From: Stefan Schäfer <[email protected]>
Date: Sun, 07 Oct 2012 17:35:07 +0200
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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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