Nearly 50 years ago, a former RO told me of the day he called an Alaskan coast station on 500 to say he was entering harbour. He was answered by Wellington Harbour Radio. John Rabson F5VLF 58800 Cerv
History repeats itself. In the early days of radio, amateurs were allocated "200m and down" with the comment that "they won't be able to get out of their backyards with that". When it became clear th
If I recall correctly, G0AKN (now SK) tried audio frequencies as well as 73 and 136 kHz. G8DSU, who monitors this list, may have more information. An article by G0AKN on this subject appeared in the
I have been given a box labelled "FET" which contains assorted semiconductors and which was part of the estate of a deceased amateur. In it there are several stud-mounted devices labelled R5159 with
CREG members use loop-to-loop induction systems for determining underground locations (particularly for establishing when the surface station is vertically above the underground one). The transmitter
In much of Europe, 148.5 to 260ish kHz is used for high-power BC. For example, Europe No 1 on 183 with 2MW (but this is QRT sometimes during the small hours for maintenance). 73 John F5VLF ** REPLY S
David Gibson has granted permission for me to post his article here and I am preparing a document (probably PDF - what is PDA/A-a format please?). 73 John F5VLF
You may find this of interest. We have found at 87 kHz (cave radio frequency) that you do not get the full benefit of multiple ground rods unless they are spaced by at least twice their depth. In you
Hello Xtian, Dr Gibson is out of the office until 3 May. I have asked the editor of CREGJ about posting the article here, and will report. 73 John F5VLF ** REPLY SEPARATOR **
Alan, I have been having trouble for about four days. The bounce messages have taken up to eight hours to get back at me, but I noticed my latest posting (less than an hour ago) has got through. John
I had a look at the patent online and it is very much oriented towards improving efficiency in coal mines. Nevertheless, there is some general discussion in the specification on the theory of arrays
