TT: Or there's this design from W6TSW back in the day for a 20M Yagi with a boom 100 meters long: http://lists.contesting.com/archives//html/Towertalk/2003-01/msg00215.html . 73 de Gene Smar AD3F W6K
I am planning on building a fold over and/or crank up mast, but I need to come up with a good lifting mechanism design. I have for the fold over and rotation, but I need something STRONG to go up 70
TT: Here's the URL for MIke's Low Voltage Handbook: http://www.mikeholt.com/technical.php?id=lowvoltage/technicallowvoltagearticles . While you're there, check out the other relevant files such as Ar
Larry: My Novice class antenna in 1966 was just such a combination of wires, except mine had a 20M dipole rather than 30 M (we didn't get 30M as an Amateur band until 1979.) You are correct in that y
Peter: It depends on how straight the run to the tower is. If it's fairly straight, you can easily pull through either material. If it's somewhat curvy due to terrain or changes in direction, the smo
Tony et al: White papers at http://www.iceradioproducts.com/33.htm and http://www.iceradioproducts.com/33a.htm explain the innards of ICE, Polyphaser and Delta lightning suppressors. To answer your q
Rudy: I agree with Gary - buy a copy of Polyphaser's book. I learned quit a bit about lightning protection therein. 73 de Gene Smar AD3F _______________________________________________ ______________
<snip> And this brings up an interesting system design question.. do you spend some limited resource (i.e. cash) on better connectors or on protecting against connector failure. It's not an obvious t
<snip> Remember, a 90 degree bend in a ground wire is an inductor, and you want a low impedance path for strike current. I would run that 1.5" strap from each tower leg, with an 18" radius bend, over
TT: Here's some info on mil- and intel-quality shielded rooms: http://www.ramayes.com/Shield_Room_FAQ.htm . Check out the tabs along the bottom of the page for details on things like 60 Hz AC filters
<snip> I guess the two things I think of to complain about are that it doesn't tell me if reactance is L or C and it's a battery eater (10 AAs). I try to minimize the use of mine on battery power and
Dan: Radiax is Andrew's version of leaky coax. It is designed to radiate deliberately throughout its entire length. It is used in such places as transportation tunnels and ceiling cavities in buildin
Bill: I agree with Dan about the three dipoles fed from a common coax line. That was my antenna system as a young Ham back in the '60s. It's a simple design and is almost guaranteed to work as well a
TT: ... and Steve's price for this info can't be beat - free! 73 de Gene Smar AD3F Howdy, TowerTalkians -- Some of you know about this but most probably don't so I thought I'd pass it along. It's thi
TT: And speaking of lightning... "Electricity is just organized lightning." George Carlin One of my favorite lines from a true talent. He'll be missed. 73 de Gene Smar AD3F -- Original Message -- Fro
TT: <snip>.... If the mast is too short, you can use a piece of aluminum tubing of an appropriate length. Lash it to a tower leg with a pulley on the top and that'll work. Cheers, Steve K7LXC TOWER T
TT: <snip> So, I am sure there are others who would take a different academic turn at t his juncture, and suggest the modeling is a close approximation of reality, but one must, in the end, trust the
Richards: Obviously, I'm no expert on what YOU can put up at YOUR QTH. I can't visualize what supports you have available or can build or how much $$ you have available for your hobby; that is always
Richards: I just re-read what I wrote in my last e-mail. I must have been asleep. The correct term for the antenna I'm suggesting is flat-top, not top-hat. You won't find correct references in the Ha
Bill et al: <snip> I doubt that you could both shunt-feed the tower and use it for a half-sloper antenna -- that would make some really odd interaction. <snip> ** A suggestion: If you are just gettin