Rik writes: Regarding the groundresistance the rules was : the lesser the better. No only for the sake of antenna effeciency but also to avoid radiation at higher angles. This 'high angle radiation'
<< So Q = 1722/4.46 = 386, which is somewhat better than your conventional coil. >> If someone actually performs such a measurement (I hope someone can; math is wonderful and theory is indispensible,
Markus' idea is most interesting. I hope there will be some way to test it. I'm less impressed with the QST article, though. From what I read there, I cannot find any new sunrise phenomenon that does
<< Due to its directivity, a short vertical monopole has a gain of 2.6dB over a dipole (4.77dBi versus 2.15dBi for a dipole). >> This is one point which may deserve some clarification. A real-world i
Oops! Between the time I composed my message and the time I finally reconnected in order to send it, Mike and others had already commented on the 2.6dB directivity. However, I believe my observation
<< I think metres are unknown the other side of the pond. They even measure the size of the engine bay in cubic inches >> Well, fans of classic engines measure displacement in cubic inches, but most
As a broadcast engineer, I have had opportunities to observe apparent ground conductivity changes with temperature, and over at least some types of soil, there does appear to be a fairly decent corre
Over here, those of us with memories of the Fifties and Sixties might recall seeing it spelled "apparatchik" sometimes, so the term definitely rang a bell for me. I like your definition, Rik--much mo
This is certainly a legitimate concern, but I wonder if the nature of the debate isn't being overstated. There may be a few folks who say it's all not worthwhile unless we can do it to commercial sta
<< The reference to "re-inventing the wheel" actually came from conversations with our regulatory authorities when I was trying to convince them to grant me an experimental licence. <snip> He said th
<< The performance of the Decca Ant. is quite interesting, the "gain"or at least the advantage over the normal amateur installation appears to be at least 20db.... This is tremendous and I dont see h
<< I even remember the days before MS-DOS when operating systems didn't crash..... >> Golly, Alan. Your memory must go back a lot farther than mine. I can't remember ANY operating system that NEVER c
<< Interesting that this way of maintaining the capacitance was adopted instead of simply putting an extra capacitor in parallel with the aerial. Can it be that the cost of the extra wires plus insul
I have only the greatest respect for Peter and his views, and I certainly don't want to begin any new and unproductive controversies on the reflector, nor to dredge up any old ones. However, it seems
Hi Larry, For most thermocouple ammeters, 60 Hz is sufficient to check calibration. The discrepancy between 60 Hz and 137 kHz should not exceed a very few percent. If your AC source is substantially
This presumes, of course, that the sender knows ahead of time when the static crashes will occur at the receiving end, and obliges by timing his words to fall between them. Surely, though, a QSO with
Congratulations! I observe that this decision amounts to the first formal LF amateur allocation in the Western Hemisphere as well, since it apparently applies to les départements de la Guadeloupe, de
I'm not sure that I would agree a single-ended push-pull output is significantly easier to bias; linear biasing of "floating" transistors is done all the time in audio power amplifers, such as are fr
<< After all, the whole spirit of the ham/internet community is that each individual should give his little contribution, be it a program, a schematics, a sketch on how to build an antenna, an operat
There has been some vigorous debate lately about the advantages and disadvantages of big and small antennas, with some holding the view that big antennas have superior radiation patterns to small one
