Hello Paul,
possibly 50Hz/60Hz harmonics and other noise are falsifying your measurement.
Horst
-----Ursprüngliche Nachricht-----
Von: Rik Strobbe <[email protected]>
Gesendet: 26.03.2010 21:35:34
An: "[email protected]" <[email protected]>
Betreff: LF: RE: Question about ground impedance at 8.97 KHZ Stefan.
>Paul,
>
>I believe that Marcus reported a loss resistance ("ground loss") of about 1
>kOhm.
>For Stefan: based on 250W/0.48A the total loss resistance should be 1085 Ohm.
>The coil (553mH, Q=82) counts for 380 Ohm, so "ground loss" is about 700 Ohm.
>So unless you are living on solid rock or in a desert 70 kOhm seem very high.
>Do you know the loss on 137kHz ? I guess that on 10kHz it will be 20 to 50
>times more.
>
>73, Rik ON7YD - OR7T
>
>________________________________________
>Van: [email protected] [[email protected]]
>namens Paul A. Cianciolo [[email protected]]
>Verzonden: vrijdag 26 maart 2010 19:38
>Aan: [email protected]
>Onderwerp: LF: Question about ground impedance at 8.97 KHZ Stefan.
>
>Hello All,
>
>Below is a quote from the Stefan's web page concerning his latest "Dreamers
>Band" DX contact Congratulations again Stefan.
>From this information alone is it possible to calculate or know the antenna
>system impedance.
>
>
>
>
>"100m Vertical wire antenna, coil/antenna voltage was abt 15kV rms, average
>antenna current about 480mA, giving up to 1,7mW ERP. Applied power was up to
>250W."
>
>Pertaining to the coil "Technical and mechanical data: L=553mH, Q=82,
>R(DC)=283 Ohm; 0,4mm diameter enameled copper wire, about 1200 turns! Average
>diameter 0,55m, height abt 0,5m. So, about 2000m wire! :-)"
>
>
>
>I have built a small impedance bridge that operates at 10 KHZ and shows my
>sloping 170' wire as 70K Ohms. I can also see approx 500 PF that can be nulled
>out using the bridge?
>
>Can the 70K value possibly be correct? (3) 6' ground rods about 6' apart are
>the ground... plus the electrical ground of the house.
>
>I am hoping to attempt a local transmission on 9KHZ
>
>Any information would be helpful.
>
>Thank you
>
>Paul
>
>W1VLF
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