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Re: VLF: VO1NA in Todmorden on 8270 Hz - also in Amberg?

To: [email protected]
Subject: Re: VLF: VO1NA in Todmorden on 8270 Hz - also in Amberg?
From: DK7FC <[email protected]>
Date: Sat, 04 Nov 2017 17:11:41 +0100
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Hi Joe,

Am 04.11.2017 16:52, schrieb [email protected]:
the far halyard on the rotated L was taken in for
another increase in the average height of the aerial. This is the
first change since 25 Oct.  The aerial current did not increase and
the inductance for peak current actually increased which seems a bit
strange.
Not at all. When the wire was very close to the trees and is not lifted a bit higher, you can expect a lower capacity of the wire against 'ground', which must be compensated by the coil. The current did not increase? Did you measure it before re-tuning the antenna to the peak current maybe? Or you had to add more turns on the coil which just compensated the saved R? Or maybe you increased the coupling of two coils to rise the L and this caused higher coil losses, which may have compensated the gained R.
Anyway, it will have increased the radiation resistance!
As long as we talk about voltage limited systems, the losses don't play a real role, just the antenna capacity or coil inductance.
I'm looking forward to Pauls new SNR report...

73, Stefan


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