[Lf] [Fwd: LF: loss resistance measurements]

[Andre' Kesteloot]

Rik Strobbe wrote:

> >From august 99 to today I measured the enviromental loss resistance of my
> antenna. The measurments were done by measuring the TX output power and the
> antennacurrent. The known coil losses were subtracted.
> Results (all values in Ohms) :
>
> 17 Aug 99 : 130        31 Aug 99 : 126
> 16 Sep 99 : 128
> 01 Oct 99 : 127        17 Oct 99 : 122
> 11 Nov 99 : 118        30 Nov 99 : 113
> 16 Dec 99 : 110        30 Dec 99 : 108
> 14 Jan 00 : 110        29 Jan 00 : 114
> 15 Feb 00 : 110        28 Feb 00 : 116
> 13 Mar 00 : 112        28 Mar 00 : 128
> 14 Apr 00 : 138        25 Apr 00 : 135
>
> >From this data it seems that periods of dry / wet weather have a rather
> limited effect on the loss (about 5 to 10 Ohms) while the seazonal effect
> (summer / winter) seems to be in the order of 25 to 30 Ohms.
> In the past I have measured values as high as 155 Ohms (dry period in
> summer) and as low as 105 Ohms (wet period in winter).
> The major summer / winter effect can be explained by the high ammount of
> 'greenery' around the antenna.
>
> 73, Rik  ON7YD