How close do you have to be to get the advantage of being at the "edge"? De k1hi Perhaps they don't know how to adjust their altimeters. Me, I'm at 62 feet, highest point in county is 75 feet and I a
They used Lignum Vitae for the blocks on old sailing ships, the ones without wheels, just multiple holes, for the rigging of the tall ships. De K1HI Rex Lint 26 Brek Dr. Merrimack, NH 03054 PH: 603-8
Frank, You say "Rohn's engineering drawings show guys installed at the top and some distance down." When I look at the info at http://www.rohnnet.com/ROHNNET/rohnnet2001/catalog/pdfs/25G/25G-9.pdf I
Steve, Using good ol' logic, try a different transmitter, then perhaps fix the FT990? Rex, K1HI Rex Lint, Consultant 26 Brek Dr. Merrimack, NH 03054 PH: 603-860-7651 FAX: 603-882-6612 --Original Mess
Hasan, There is a design done by Jeff Briggs derived from the Battle Creek Special that you could adapt. He called it the "BC Trapper" and I'm sure you can google it. It's a 40-80-160 with top-loadin
Don, We've regularly "walked up" 30 feet of Rohn 25 at field day - without a "hinged base". Of course, there are more than 3 people, but many of them don't add any muscle to the process. 3 should be
The 2005 handbook says, "If insulated wire is used, a 3 to 5% shortening beyond the standard 468/f length will be required to obtain resonance at the desired frequency. This is caused by the increase
Joe, Why wouldn't you just add half of a 1/4 wave to a 1/4 wave? 90 degrees plus 43 degrees - 135 degrees. Rex - K1HI Merrimack --Original Message-- From: towertalk-bounces@contesting.com [mailto:tow
Oops! That should have read 90 degrees plus 45 degrees = 135 degrees. We're talking electrical length here, not physical length - but you already took care of that issue by using the velocity factor.
Hector, Why not just bend the ends toward each other: I |\ I | \ I \ I > I / I | / I |/ I I Rex, K1HI TT's: I read the last NCJ, where K3LR 160m Dipole as sloper appears, i will like to try something
Matt, See http://www.knmi.nl/samenw/hydra/faq/press.html Wind doesn't have a "force," it puts pressure on an area. Once you know the pressure and the area, you can figure out the force. The area depe
It seems to me that a 2 inch boom is really too short... Rex K1HI Rex Lint, Consultant PH: 603-860-7651 FAX: 603-882-6612 --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk
With a 2 inch long boom, they'd be pretty close together... I wouldn't expect element thickness to play more than a small part unless the elements are very close together and then I'd not expect much
The higher loss in the 213 will hide the mis-match more than in the hardline. K1HI - Rex Given a long enough feedline, one can make anything at the antenna end look like a perfectly matched load in t
Michael, If you were to use a push-up mast and put a TV antenna on top of that, would the town make you get an engineering analysis of the set-up? I'd try to talk them into relaxing the requirement.
to turn when the tower twists, taking the torsion load off the base - one of the common failure modes. Don't unhook your guys, tho! De K1HI Rex Lint --Original Message-- From: towertalk-bounces@cont
I'd be careful about non-symmetric guy placement - it changes the horizontal forces so they are out-of-balance. Last field day a tower at N1FD bent over because one of the guys was much longer (furth
One thing that happened on mine was that the insulator that holds the straps that connect the two driven elements together decomposed and the straps, which cross over each other, would periodically s
Here're a few changes that might make it easier next time... Get a few helpers so you can walk up 30 feet WITH THE GUYS ON IT. Secure the guys, then put 2 more sections on, just like you did before.