You have a very good "scientific" (and humoristic) test about Ultra Ever Dry in Ars Technica : http://arstechnica.com/gadgets/2013/03/the-internet-demanded-partially-scientific-testing-of-ultraeverdr
Hi Jim, I remember from my old Line Theory lessons than the choice of 50 ohms for coaxial lines is not accidental. I cannot remember the exact background but in TEM mode the lower losses (and then be
Hi, I agree that's the best way to measure Vf and have the right length of cable for a 1/4 or 1/2 line. However, having a longer cable run is not always desirable as it may increase losses and and pr
Hi, I want to build a portable antenna for 20m. This antenna will be installed temporarily at a low height, around 3m above ground (10). Ive modeled two antennas in MMana-GAL and compared their gain
Hi All, I received many comments about this. Thanks for your inputs. First I need to say that, in first place, if I shared my results here, that was because I found them interesting if not disturbing
Go for a "tower-mounted shack" and you will even solve the feed lines losses we're talking about in another thread. By the way. That's what we do for medium-power microwave telecommunication equipmen
Hi, To make it short, CQ Magazine owes me some money. I'd like to use this money to buy a few books in the CQ online store and donate them to our national Radio-Club so they can then give them to beg
Thanks Bud, Norman, Roger and Bud for your answer. Sorry if I've been long to answer but I was without internet at home during most yesterday's day. I will make my "order" to CQ later today. 73, Yan.
Hi, Merry christmas to all! Yes Jim, and your rotor's brake will move with wind, your tower/mast will flex, your antenna boom too... I think for HF seeking better than 5 degrees true north accuracy i
Hi, A few years ago the cable TV network of the city went bankrupt. They left kilometers of then unused cable on the poles. Yesterday, the telephone company guys did some clean-up on the poles (they
Hi Roger, Thanks for your answer. I've not studied their topology in details. What I've seen is that the drops were in RG-6 (going for up to 200m in some cases) and the bus (not sure about the main t
Thanks Jim, Bill and Roger for your time. I think they're using N compression connectors and I would be able to find them in Saigon. I already have the BNC ones I'm using sometime for the RG-6. Howev
Hi, N6LF did a very comprehensive study on radials setup and layout effect on verticale efficiency and radiation. It was published on QEX but is available online for free. To make it short from what
Hi, I am also using DXKeeper and I recommend it. That's true it is very feature-rich and settings can be overwhelming. However, the default settings usually works great and I really seldom have to di