I think we need to be a little careful that the baby does not leave with the bathwater. For example, I am quite confident that the CFA antenna does not work as its inventor describes. Nevertheless, t
Almost certainly. My point was that he does not (or did not) think he had missed anything. He clearly imagined that he had uncovered a previously undescribed mechanism which would permit efficient ra
Tom's post is exactly correct except to a nit-picker... I hate to disagree Tom, but there is always an external field even with perfectly shielded coaxial cable. This is because the outer conductor h
Exactly that. A 100% coverage, perfectly uniform, perfectly conducting shield which is of course not possible in the real world. If that perfect shield has a finite thickness, which it has to have in
Just to say that I agree with this evening's posts and conclusions from Tom W8JI and Jerry K4SAV on this subject. Just a couple of points: The external field from even a perfectly shielded coax cable
When I moved to Canada from England I was surprised to find that neither aluminium alloy nor steel scaffold poles appear to be available here. (It seems to be that tower scaffolds are universally use
There was some fairly harsh criticism last week of the automatic antenna selector unit design published in this month's QST. I only just received my magazine so wasn't able to read the article until
I just have to come back on this one.... (1) I do not think that the article was particularly well written, but didn't see any significant technical inaccuracies. For example, there was a long explan
The advice given is sadly correct. Several decades ago I had a friend who was an insurance loss adjuster. He said on a number of occasions: "Insurance companies don't mind paying legitimate claims -
Red - I am impressed by your calculations. Just think how much easier it would have been to use metric units throughout! 73 Roger VE3ZI ___________________________________________________________ All
One QTH I had in England was about a mile from some 400kV lines. During damp or misty weather (ie nearly all the time in England!), the noise from the lines made operation on 160m or 80m almost impos
I am very fortunate to have a number of long Beverages for 160m receive. These work very well for DX, but during CQWW last weekend I realised that they are much too directional for running the US - i
Many thanks to all who replied both on the list and privately. Several suggested a low dipole as an alternative. That antenna I already have and whilst it does work well it is more or less omni-direc
It is quite while since I visiting a cable manufacturing facility. However, BICC certainly made the complete cable in house. A single machine would produce the copper wire from a large diameter ingot
... "When the Navy (I believe it was) and their contractors developed coax and the resulting connectors for use on board their ships they named them UHF" ... And a little Googling will show that the
Not sure that I should add to this lengthy theme, but my empirical experiences on 160m: (1) An inverted L, 50' wire vertical section in a tree, about 10 pretty short radials - take that as reference;
Could I just add that it's not only the crimp tool - it's the actual crimps. Some of those available at the mass outlet stores here (Ca**ian T*re, Wa**rt) are made of some highly inferior material an
The leakage from a coaxial cable is only indirectly related to the braid coverage and/or 'hole size'. It does not leak out of the holes like water through a sieve! What happens is that the coaxial mo
Actually, transfer impedance DOES remain constant with frequency WITHIN THE LIMITS OF THE CABLE DESIGN. In much the same way we simplify the characteristic impedance of coaxial cable and say that it
Just a little anecdote. I have been having some problems with noise on my K9AY array, but only when one particular set of relays was energised. Having pulled everything apart several times (on the gr