Re: LF: RE: 136kHz WSPR experiment

[Roger Lapthorn <rogerlapthorn@gmail.com>]

To get best results I think you need LOW conductivity around the earth-electrode "antenna", so the signal spread (and hence effective loop area) is greatest.  Placing near a river is likely to give poor results in my experience.

At 136kHz I suspect the earth-electrode "antenna" can be better than many solutions in the better directions (end-on), although I very much doubt that would match a good Marconi with a good ground system. My compromise vertical is NOT a very good LF/MF antenna!

73s

Roger G3XBM

On 24 January 2018 at 10:38, Marcin <bxi@go2.pl> wrote:

Hello Roger,

 

Big earth electrode antenna allows transmitting on 136kHz with average results.

https://klubnl.pl/wpr/en/index.php/2018/01/09/most-na-wisle-elementem-anteny-czyli-eksperymentow-z-dipolami-ziemnymi-ciag-dalszy/#more-720

We are slowly getting ready for testing at 8.27kHz but for this test we needed 10km of wire…

73! Marcin SQ2BXI

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Roger Lapthorn
Sent: Wednesday, January 24, 2018 10:20 AM
To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk
Subject: LF: 136kHz WSPR experiment

 

A couple of Gs came on. G3XIZ (46km) was 2-3dB better S/N on the earth-electrodes than on the compromise vertical. He is end-on to the "loop" in the ground. G6AVK was not copied at all. He is orthogonal to the "loop" in the ground. I was quite surprised not to spot him at all though.

 

Conclusions? The earth-electrode "antenna" in the ground is quite effective at 136kHz, but more directional.

 

Next season I will definitely try an , E-field probe on RX!

 

No great DX, but experimentation!

 

73s

Roger G3XBM