Re: LF: Antenna tests

["Dick Rollema" <d.w.rollema@freeler.nl>]

To All from PA0SE

Markus wrote:

> Though I normaly really dislike the
> cold weather (as does my 17-year-old Golf Diesel which is supposed to
> take me to work), the one good thing about frost is the improving
> LF-antenna performance. Series loss resistance goes down by 1 to 2dB, and
> surprisingly, in addition to that I seem to get another 1dB from
> increased effective antenna height, as measured by comparing received
> voltage against a non-resonant loop. There are a few high fir trees in
> the vicinity of the aerial, and I assume that under heavy frost, the
> shunt conductance of the trunks falls below the capacity of the tree
> crowns, so that electrostatic shielding is significantly reduced.
I measured the earth resistance at my station several
times this year:

On the dry day of 6 April it was 21 ohm

On rainy day 5 May I measured 36 ohm

After a period of prolonged rain I found on 16 November 66 ohm

After several days of frost I found today 12 December 28 ohm.

There are no trees around.

The water table here is at about - 0.8m.

73, Dick, PA0SE