years has tanks at least that size. If you can haul it to them, they can galvanize it. 73, geo - n4ua _______________________________________________ _______________________________________________ T
If you can do proper surge protection and grounding at the point where it enters the attic, it should be a non-issue. Otherwise, I'd carry the cables down to the base of the tower, do the surge prote
Brian said he was putting up a 160 vertical with no other antennas on the tower. There's nothing to put any torque on the tower, thus absolutely no requirement for torque arms (even if you believe in
If you heat a bearing to the flash point of the grease, you've probably already destroyed the bearing. 73, geo - n4ua _______________________________________________ _________________________________
You might also consider rotating one of the antennas 90 degrees for a coupling test "in place". If the interaction goes away, you might want to make the 90 degree offset permanent. Either keep track
That's a gross oversimplification. There's applications for both of them. I have 3 towers; two are guyed with EHS, broken up with insulators, and the third - a rotating tower - is mostly guyed with P
In the case of a radial system on or just below the surface of the earth, one or many ground rods connected anywhere to the rf ground system should not hurt, and in limit cases may help, the radial s
A few clarifying points, if I might... 1. N6LF has done great work, and he explains it well. 2. I said nothing about elevated radial systems. 3. "RF ground system" is a perfectly good term and is acc
In the past year, I have made and measured (on a network analyzer) seven choke baluns, made of multiple turns (5 to 7) of RG-142 through multiple cores (3 to 5, 2.4" OD) of type 31 material, all depe
I have one of these old beasts, and it works! It is the predecessor to the HDR-300, and it has a unique point-and-shoot controller with a great-circle map on the face. Date codes inside the controlle
Thanks to John, K2TQN and Tom, W3FRG, I have a pdf copy of the manual. 73, geo - n4ua _______________________________________________ _______________________________________________ TowerTalk mailing
Don't worry about it. The anti-oxidant will do its job with or without metallic particles added, particularly on new, bright aluminum. The function of the grease is to exclude oxygen; the mechanical
Good morning, Doug, Heat the nut with a torch - you really can't get it too hot - and throw some penetrant on the threads while it's hot. Try to wiggle it when it's hot. If no movement, try a couple
You may as well break it up in place with the jackhammer. I think, that even if one of the other methods of getting it out in one piece were successful (and I have my doubts), you still have the prob
Hello Markku, It depends on where you live in the US and who lives near you. If you live in a housing development, near other people who might be affected by your construction, then regulations and i
Joe, You can get them from Tom: w3frg1@gmail.com 73, geo - n4ua On Tue, Apr 22, 2014 at 10:31 AM, Gary "Joe" Mayfield < gary_mayfield@hotmail.com> wrote: _____________________________________________
HI Rich, The trick is to open them up *sideways*. If you can, clamp the long dimension in a bench vise, horizontally, held below the center line. Then use a "crescent" wrench or a large pair of plier
Herb, Lawson, "Yagi Antenna Design" , and later Leeson, "Physical Design of Yagi Antennas" (both ARRL publications, but probably now out of print), cover the calculation of the electrical length of t
I think I've mentioned it before on this forum, but I converted my TB-3 thrust bearings over to thrust bushings by machining them to accept inserts made from a dry lubricant-loaded composite, Nylatro
Hi Dave, The big difference IMO is that you *use* yours. The really damaged ones I've seen - and they are the ones I inherited to make my modified ones - are from something like a TH-6 mounted on a H