It does not matter where capacity conected: at the end of inv-L or at the feeding point. Add condenser Cp between ground stake and antenna! Then a foil is needless. Regards, Alexander
Hello Alexander, if using a short vertical monopole antenna at 9kHz a ground loss of more than 1000 Ohm seems quite realistic to me. "Ground loss" at my QTH: 500kHz = 35 Ohm 137kHz = 130 Ohm The freq
Alexander, I don't think it is real ground stake loss. Mainly it is 'enviroment' loss (due to trees, house e.t.c.). I agree, that's why I had the quotes arround "Ground loss". It will increse loss:-)
Hi Rik and others, Thanks for your contribution. "Ground loss" at my QTH: 500kHz = 35 Ohm 137kHz = 130 Ohm Do you mean resistance in the strict sense, i.e. the resistive component of impedance; or in
So, the coil losses decrease with it's L (assuming a given wire diameter, coil diameter and spacing and so on) and thus it is good to decrease the needed L. So we have to spend a high coupling capac
You can decrease L only by condenser in parallel with a antenna. But then only part of coil current will flow thrue the ant (and ground stake also). Let's describe some numerical example. Let antenn
Chris, the values are measrued with antenna in resonance, so they are "ohmic". It is the sume of all kind of losses (soil, greenery, coil) and (almost neglectable) the radiation resistance. 73, Rik O
I don't think it is real ground stake loss. Mainly it is 'enviroment' loss (due to trees, house e.t.c.). I don't think so. This behaviour should change. Good insulator (HF frequency) or good conduct
