Paul, There were several references to this topic in the Cave Radio & Electronics Group Journal. I have a complete set to date of its publication. I will go through to let you know what I find. 73 Jo
Paul, There are several short items in CREGJ on the topic of earth rods, and I can send you a list, but the best paper I have found is the one by David Gibson: "The Resistance of Ground-Electrode Arr
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
JB, Roger, LF, It isn't quite that simple. The standard analysis of a long thin ground rod (as per David Gibson's article) is to estimate the radius of the buried hemisphere which would give the same
That's pretty amazing. You must have really bad soil conductivity. Did you try receiving on the earth-loop antenna? Would the technique work on 137 kHz, I wonder. 73, Dave G3WCB IO91RM, nr Windsor,
Mike, You can find online sites which will translate single sentences and words from German to English. One of these should be good enough to give you the sense of the captions. High quality machine
I find some of the online translation facilities good for getting the meaning of a word but, even when you only need the sense of a passage, you will do much better if you have some understanding of
On 1 Jun 2010, at 17:20CEST, Reeves Paul wrote: What are these cryptic designations? Oh, yes - some sort of foreign vehicles. What about doing the job properly and using a Land Rover? Actually can go
I think well do the single layer route and thus be readily upgradeable, rather than risk setting fire to Chris shed and my garage!! B (or perhaps Mal, that was your evil plan all along.??!!!! J ) =
Stefan, Many thanks for this. I am finding it very useful. 73 John F5VLF On 1 Jun 2010, at 11:49CEST, Stefan Schäfer wrote: LF, VLF, Once i have created an Excel sheet for calculating my vertical kit
On 3 Jun 2010, at 00:18CEST, mal hamilton wrote: Roger Some say a NOV is not necessary on this QRG. It depends on the country. The last time I asked, the Crown monopoly on UK radiocommunications (whi
I envisage a dipole about 30 m long and about six or 8 m above the ground, this being what I can conveniently fit behind the shack. I intend to measure the R and X series components at a range of fre
On a point of information, the aim with underground communications is to achieve a speech link over several hundred metres or more. The best I know of on 87 kHz is 1.6km two-way and 2.5km one-way in
Members of the Cave Radio & Electronics Group have been using and investigating earth loop antennas for some time. The theoretical basis of such an antenna has not been clear to us, but Dr David Gibs
Andy, I hope to be doing some aerial experiments (yes - above ground not below) in the next few weeks and will see if I can put something up and do some measurements. 73 John F5VLF On 26 Jul 2010, at
Alberto di Beni's My ancestor, Amalrico di Bene, died in 1207 after being excommunicated by Pope Innocenzo III, would be quite upset by seeing his family name spelled that way.... {:) 73 Alberto I2PH
