That doesn't matter. What matters is distance from your ANTENNAS, and the distance of modem ANTENNA (wiring) from your ANTENNAS. 73, Jim Brown K9YC _______________________________________________ Top
Yes, I'm using some of them, nailed to big trees along the path (I'm in a redwood forest). I'm typically going 25-50 ft between supports. 73, Jim K9YC _______________________________________________
feed That can work. See http://audiosystemsgroup.com/K9YC/k9yc160TopLoad.htm No, it is NOT an issue. A connection to the earth matters ONLY for lightning protection. That's important, but it has noth
About a year ago, I replaced almost all of my incandescent bulbs with Phillips Marathon CF's that I bought at Costco. I checked very carefully for RFI, and have never heard any. The only failure I've
I suspect you are right, Rick. Jim _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
And we on the west coast are equaly anxious to hear you guys! Europe on top band is VERY tough from this part of the world. I've heard EU signals only three times, and put only two of them in the log
Two observations. First, the antenna needs some low impedance radiator to act as a path for return current. Second, whatever carries that current will radiate -- it's RF current, so it radiates. In o
I also have many tall trees (redwoods, Douglas Fir), and some smaller ones (birch, madrone, pin oak. My 160 vertical is 70 ft tall and top-loaded, suspended between two tall trees, at least 20 ft fro
It's a matter of learning how to best take advantage of Ma Nature. She defines the rules. we need to study and understand them. EXACTLY! 73, Jim K9YC _______________________________________________ T
Excellent work. The next step, of course, is to rig one antenna in the clear and one next to a tree, and do A/B comparisons on the air. I have the space and the trees. Perhaps one day I'll do it. :)
I read with interest your comment about running a line between the tops of 2 tall tress. I would like to do the same but I am not sure how to mount the support so that the swaying of the trees does n
people. Yes I do have the books most of you suggested... Yes. If it's close enough to touch at the ends, it will arc with high power (I have the charred pieces of wire to prove it). If it's close nea
When you say "cage" I think you're talking about bonds between the vertical conductors along their length. Only tall palm trees and the like are built to make it that easy. :) Most trees that can sup
The feedline is doing two things to you. First, it is transforming the impedance by virtue of its length. If the line had NO loss, the SWR would remain constant, but the measured values of R and X wi
I think your hypothesis for what you've observed makes sense, at least for radials on/in the ground, whether the effect is log or linear. Think of it this way -- the other half of the antenna (the ra
Congrats on doing it mobile, Robin. Mobile rigs can do a lot more than we give them credit for. I've worked some DX through pileups on 30M, as well as some long path from NV to EU with 100W and a Ham
You should stay longer on the air if you want to work the western US. Our sunset near San Francisco is around 0030Z, and openings to EU from here, which are much more rare than to the eastern US, typ
I see nothing wrong with your plan, except that the routing of the coax in the vicinity of the antenna might cause slight asymetry in the patterns of each, which might skew the pattern slightly. Go a
The better test is to RAISE the signal by one dB after you've buried it in the noise. Those of us working in pro audio have learned that changes of a dB or so in the level of a signal that is near th
YES, they should all be bonded together. Ideally, I would do it with large bare copper wire. Using bare wire will increase the area in contact with the earth, which reduces resistance to earth. The p