Even at low power, large currents can flow in certain components. This sounds like something is heating up and changing value. A giveaway would be if the match drifts faster at high power than at low
I have an HDBX48 that has been in service (by now) for nearly 30 years. Mine has been holding 18 sq feet plus 8 ft of 2 in mast for that length of time with measured winds up to 86 MPH. It's hell-for
This comes directly from wind observing towers for wind farm siting. They are all under 300' tell and do not subject to FAA obstruction marking requirements. These are erected essentially overnight a
Roger, K8RI is a pilot and I'm a pilot (there are no doubt others on this list), though I'm a private pilot and don't fly commercially. I'm a research meteorologist at the National Severe Storms Labo
That's interesting because it has not been my experience here in Oklahoma. I have seen aluminum wires corrode over a few years, but my solder joints (regular 60/40 stuff) have survived well. They beg
Several have mentioned potential failure points for the SteppIR antennas. I haven't heard about many failures. In fact, I can't think of any. There are a fair number in us by now. How often are failu
I'd be surprised if there are any definitive numbers on this because there are so many variables, not the least being the purity of the water that has entered the transmission lined. All I've ever he
Maybe because the effective change in diameter due to beaded water drops is a smaller proportion of the total diameter using the 3/8" tubing vs the 1/8" rod, but that's just a guess. Kim N5OP Every s
OK, but... Has anyone actually measured the Q of any modern traps? I have a KLM-KT34A. Its linear loaded traps are supposed to have much less loss, but while I cotton to the idea, I've never seen any
FWIW, I ran the Chinese through a Google translator and it's essentially an out-of-office auto reply, unlike the last instance, when it appeared to be selling something. Kim N5OP My email program wil
I'm a researcher prologue that the National Severe Storms Lab in Norman, OK. There's a fair bit of lightning research done here, mainly on the physics of lightning. I know a few of the guys that do t
Excellent points, Doug! That's exactly why Uman reported the median in his work. The median is a "resistant" statistic, but also nonlinear and so has qualities that are difficult to model. The distri
Exactly! No one should care about the mean: they should care about what part of the distribution they want protection for and for what part of the distribution they'll take the risk. This boils down
Most weather vanes require them to be level. Anemometers not so much; if not level, they will underestimate one of the two horizontal wind vector components. To see something significant, though, req
Which should work better for domestic contests :) Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith ________________________________
Interesting! I have some anecdotal experiences that support the "low inverted V is better for local contacts" school. I am mostly CW and tend to primarily chase DX and so have an F12 Sigma 80 OCF ver
My dad (W5JHJ, SK) used an AV640 for a number of years on 40 m when we had a schedule between OK and CO on 40 m every Sunday afternoon. It was up about 10 ft above the ground attached to the eave of
I've had UV eat up the Nylon in nylock nuts. Theses were exposed to direct sunlight for several years and the nylon insert was simply gone. I think that if they were protected, they'd last indefinite
Fortunately, I have no direct experience with tower failures but did see the results of s very tall TV tower failure. It was in (I think) 1987 or so. KTUL TV in Tulsa had the tallest tower at the tim
The link didn't make it for some reason, so I'll try again: https://www.youtube.com/watch?v=EiXmpbXkoWY Kim N5OP From: Kimberly Elmore <cw_de_n5op@sbcglobal.net> To: "towertalk@contesting.com" <tower