Depending on your location, time of year can make all the difference when installing screw anchors. I used some Hubble/AB Chance "No-Wrench" screw anchors with a 8" diameter helix and 66" long rod. h
My instincts tell me this is a bad idea, but perhaps others have done this successfully. I currently have an OB9-5 HF yagi (spec 7.8 ft^2 projected area) mounted one foot above the top of my tower. T
Some recent posts on grounding reminded me of something I've always wondered about. How is the radiation efficiency of a copper wire HF antenna affected by oxidation of the copper over time? Empirica
Synchros have been around for years. Those that run on 400 Hz were typically found in aircraft systems whereas the 60Hz variety were found shipboard in gun fire control and radar systems. The link be
Since terrain effects have entered the discussion, here's my 2 cents (probably less) on the subject. Like any modeling program, be careful interpreting HFTA results. See my earlier post at: http://li
Jim, Have you looked at https:/www.lightningmaps.org/?lang=en# https://www.lightningmaps.org/?lang=en# or http://en.blitzortung.org/live_lightning_maps.php They may not have the data right on their w
Scott Take a look at http://www.anchorguard.com/index.cfm I have no connection with the company nor have I used it's products. Just something I ran in to when planning my tower project a few years ag
I saw the one post on this topic about PolyPhaser saying grounds further apart than 75 feet "don't (effectively) see each other" during a lightning strike event even though they are bonded together.
This is actually what is done at launch pads. Catenary wires typically run from the protection towers surrounding the launch pad to a point a distance away to try to direct the strike and large curre
I occasionally teach a class on modeling certain mechanical systems using Simulink. The second slide is a quote from the British mathematician George E.P Box. I think it may apply to this discussion
I'll add a few stories from my RFI experiences. The first one was a problem with a very wide band pulsing noise that suddenly appeared that I tracked to my neighbor's house about 100 yards away. Coul
Some good reading on this topic can be found at https://rudys.typepad.com/files/qex-nov-dec-2k-antenna-wire-conductors.pdf I discovered Rudy's paper after searching for information on the effect of c
If you can make the measurements shown, these two sites might help. https://www.quabbin.com/tech-briefs/method-calculate-capacity-reel-or-spool http://www.mossbergind.com/reel-calculator/ ___________
There are a few crank-up towers that were designed to be optionally guyed. The one I'm familiar with is the old EZ-Way crank-ups that have beefy brake plates which flip in to hold the section above a
For my tower, I used 8"x66" screw-in anchors (part number PS816) from Hubbell Power Systems, a division of AB Chance. This is what the local power company uses. See: https://www.hubbell.com/hubbellpo
I had posted a thread a while back on the topic of safe tower climbing with a few thoughts and maybe its worth mentioning again. http://lists.contesting.com/archives//html/Towertalk/2016-06/msg00207.
With the sunspots down, work slow and COVID keeping me home, I had some time to start a project that Ive been thinking about for a while. I've always been interested in tools to discover locations fo
Did the lineman say what he found bad? Cracked insulator? Bad lightning arrestor? Bad ground? Something else or a combo of several? Just curious. N3AE _______________________________________________
Remember Crocodile Dundee saying "That's not a knife, THIS is a knife." Well, if you want to see long cable spans, take a look at this: https://www.wsmr.army.mil/testcenter/testing/landf/Pages/Aerial
I have several Cablewave 738801 Type-N female connectors for FCL12-50 cable. Anyone know if these connectors can go on to Andrew LDF4-50A cable as well? I'd love to find a matrix of hardline cable ty