In cave radio experiments we find that one x metre rod can be replaced by x one metre rods spaced by 2x or more metres. See also The LF Experimenter's Handbook, Appendix 1 (particularly figure 11) 73
Hi Doc and guys The ISO standard is Year, Month, Day, which shouldn't confuse either side, unless one is from Mars perhaps. I have started to use this when I can remember, but I still prefer Day, Mo
I believe the feed current was 500A. 73 de John Rabson G3PAI By the way the last time I was at Rugby GBR (16kHz) in the tuning loft, the tuning-coil/variometer was made of 'litz' the diameter of an m
Mike, For jelly read jam? 73 de John Rabson G3PAI Right! Over here paraffin is what you put in an oil lamp. Well, I'm from Wales... 73 Mike -- M.J.Powell
Well, here we get into the very muddy waters of just how you measure ERP - seemingly a very imprecise science. Also the far more interesting area of matching the antenna to the propagation medium (s
Hi Guys, I have been rather quiet lately due to work pressure. The job that I have been asked to do has required me to get up to speed on the latest 32-bit Windows SDK and DDKs. You would not believ
Now that's a thought. I have some E88CCs somewhere... Incidently, returning to an earlier topic, the current Naval standard HF receiving antenna on board ships is an active whip, made from a 2m lengt
When I was involved in designing 50 Hz mains transformers we had a rule of thumb that we required one pound of laminations for each 20 VA to be handled. Is it possible to derive an equivalent figure
The "normal mode" helical aerial by DA Tong. Radio Communication Jul 74 pp 432 to 437. 73 de John Rabson G3PAI I haven't been able to find this article - if you can find any more info I would be grat
3. One other idea is to stake your property boundry with electric fence posts, then get the electric wire that contains 2 strands of copper, 3 strands of stainless steel, and a nylon strand. Get the
Maplin do a 2 pole 10 to 15A knife switch (FK31J) at GBP 1.79. Would it do? Thanks Costas and Geri, 'Ye Olde Navy Knife Switch' looks ideal but 42 dollars plus shipping is a bit expensive! 73, Tom G3
Hello Wolf, Thank you for your suggestions. I shall add them to the new site. Looks as if I should add your site to my favorite links too, as I am very interested in cave radio (being on of those "ea
I am updating the Cave Radio & Electronics Group website at http://www.bcra.org.uk/creg/ and would like to include a link to a site which deals with conventional (!) LF amateur radio. May I have your
I think its 4%! 73 de John Rabson G3PAI That's set me thinking evil thoughts ....... 600V Mosfets in bridge. 3 phase rectifier giving 13% ripple even without any decoupling caps, at a ripple freq of
