Hello Roger, interesting. Did I read it correct that your transmit frequency is 1kHz instead of 9kHz ? I gues that also ground antennas become more efficient at higher frequencies. How did you mat
Thanks Horst. I'll try a Marconi antenna at some point, although my space is limited to little more than the antenna I used on 500kHz (a top loaded 5m vertical). This evening I extended the TX elect
Yes, the loop will null the signal when turned 90 degrees but the signal was strong enough yesterday to be copied, just, when the loop was in its worst orientation some 300m away from the TX. In my v
Thank you for your fast reply Stefan. In answer to your questions: Currently, my TX electrode spacing is 10m, which is the best I can manage in my small garden. Both electrodes are as far away from t
Roger, sorry, I made a mistake. in the near field the H field drops 40dB/decade and the E-field drops 60dB/decade. Assuming the ground antenna acts as a loop (= H-field) the signal drop between 0.4km
So, if you would try SpecLab or Argo on a PC and use a stable VFO i think it is no problem to reach those 3kms in say DFCW-600. Than, it is much more easy to improve your system since you can see how
Stefan, Rik (et al dreamers), All noted regarding QRSS modes and likely impact on the near field range expected sub-9kHz - thanks all. Yes, I shall have to try it and see what happens in reality. Upd
Hi Jacek, Thanks for this encouraging information. I'll definitely try an e-field TX antenna later, although space is very limited in my garden. The grounded electrode pair "antenna" does appear to
- What antenna did you use for RX? Loop, e-field probe? i used an e-field probe - Have you tried TXing using grounded electrodes? If so, what range did you achieve and what RX antenna did you use? i
Roger, the near fiels signal drops with the 3rd power of the distance. So 3km versus 0.4km = 422 times weaker = -26dB Going from regular CW to QRSS30 will give you a 24dB benefit, so there is a fair
Hello Roger, For your ground electrodes, ground electrodes may be the best "antenna" in some 10...10m. I'm not sure how to calculate field strengths but i just know about the 1/d^3 dependency, so twi
Chris, Roger, there seems to be a lot of confusion. I just looked it up in some old tekstbooks, but they are very brief on this matter. A quick "google" wasn't of much help either. A clue maybe in
- The best DX targets are quite modest: I would like to exceed 1km initially with the TX power I currently have (around 4W). If I could reach G6ALB in the next village 3kms away I would be delighted
Hello Roger, interesting. Did I read it correct that your transmit frequency is 1kHz instead of 9kHz ? I gues that also ground antennas become more efficient at higher frequencies. How did you match
73, Stefan ________________________________ Von: [email protected] im Auftrag von Roger Lapthorn Gesendet: Mo 24.05.2010 22:28 An: [email protected] Betreff: Re: LF: AW:
Hello Roger, as you mention the setup is far from perfect, so it is quite facinating that you can hear it with very simple means up to 400m. I guess that by increasing power, optimize antenna matchin
Chris, Roger, there seems to be a lot of confusion. I just looked it up in some old tekstbooks, but they are very brief on this matter. A quick "google" wasn't of much help either. A clue maybe in on
Out from my garden I tried my 10h/20t Marconi as well as a 30m earth base. The Marconi worked better, but not good enough. A TV transformer (must be flyback of course) made it much better. But all th
Roger, the near fiels signal drops with the 3rd power of the distance. So 3km versus 0.4km = 422 times weaker = -26dB Going from regular CW to QRSS30 will give you a 24dB benefit, so there is a fa
Rik, LF, On 25 May 2010, at 09:00CEST, Rik Strobbe wrote: "I am still wondering how an earth current antenna really works. I have read an article that claimed that such an antenna was an underground
