RE: LF: Ant current

[Laurence KL7 L <hellozerohellozero@hotmail.com>]

Opps wrong reply to wrong group :-( - apologies  Laurence KL7L

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From: hellozerohellozero@hotmail.com
Date: Sat, 1 Feb 2014 13:25:15 -0900
To: rsgb_lf_group@blacksheep.org
CC: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Ant current

What about the D layer acting as a reflective Medium even at MF...be interesting to see if isig max occured at near max Solar illumination at midpoint,,, (per Alan in the past :-))

Laurence

On Feb 1, 2014, at 1:13 PM, "Bob Raide" <rjraide@hotmail.com> wrote:

Alan;
From my broadcast experience and taking field strength measurements-frozen ground can over double the normal warmer weather conductivity which would not be even close to the salt water conductivity of 5000 mmohs per meter of salt water-Bob
 

> From: alan.melia@btinternet.com
> To: rsgb_lf_group@blacksheep.org
> Date: Sat, 1 Feb 2014 20:08:58 +0000
> Subject: Re: LF: Ant current
>
> Why?
> I think its possible that frozen ground increases the efficincy of a given
> system, but that same antenna conguration would probably work even better
> still over salt water??
>
> Alan
> G3NYK
> ----- Original Message -----
> From: "C. Groeger" <aot.aot@gmx.de>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Saturday, February 01, 2014 3:18 PM
> Subject: Re: LF: Ant current
>
>
> > Thanks for quick reply, Wolf!
> >
> > But then propagation from a mf tx on a ship on sea should be worse then
> > from land?
> >
> > Christian Groeger
> >
> > wolf_dl4yhf <dl4yhf@freenet.de> schrieb:
> >
> >>Hi Chris,
> >>
> >>By coincidence, I just had to re-adjust the antenna for exactly that
> >>reason:
> >>
> >>The conductivity of water is better, but the 'tangens delta' (loss
> >>factor) of water as dielectric is much worse than that of ice.
> >>So the water "robs" energy in presence of an E-field, which the ice does
> >>not.
> >>Thus the losses around the antenna go up. Depends a lot of the greenery
> >>around the antenna.
> >>
> >>Cheers,
> >> Wolf DL4YHF .
> >>
> >>Am 01.02.2014 15:51, schrieb C. Groeger:
> >>> Hi all
> >>> How can one explain that ant current rises when soil is frozen?
> >>>
> >>> Conductivity of water should be much higher than that of ice.
> >>>
> >>> So earth resistance would be higher and the current should drop when
> >>> soil is frozen...
> >>>
> >>> 73, df5qg
> >>>
> >>>
> >>> Christian Groeger
> >>
> >>
> >
>
>