This reminds me... One can relieve a lot of sideways forces on the top of the mast when tramming up a large, heavy antenna. The trick is for the tram line run from the ground up to the attachment poi
Also needs excellent isolation between ports! A lot of us could use this... -- Eric K3NA I'm looking for an HF antenna switch matrix (or suitable combination of off the shelf widgets) that does the f
The Kerry website has a page for feedback on issues. The URL is: http://www.johnkerry.com/contact/contact.php This sounds like an excellent topic for polite, prompt reaction. -- Eric K3NA --Original
Hi Dick -- Some thoughts: 1. Simply deleting the source from the unused antenna changes that element from a dipole to a continuous piece of metal -- which is NOT what you have. Rather than deleting t
Two other checks come to mind: 1. Sight up each leg to see if there is a bend. 2. Check the loose guy's anchor location. It is possible the wind load may have moved the anchor; e.g., by compressing s
Barry -- You are looking at a very challenging mechanical engineering situation. As others have pointed out, a sag limit of 50 ft will require substantial tension in the line. Any post-type anchor mu
on 05 Nov 23 08:03 Ian White GM3SEK said the following: Unfortunately, most residential buildings are nearly transparent to lightning-induced currents -- or any other kind of electrical activity. Env
This is for everyone who complains about the snow static QRN on the bands. The big snowstorm is rolling over Boston. It's snowing, sleeting, raining with lightning and thunder. (A commercial jet just
Does anyone have a description (modeling file or physical description) for a 204BA that is modified with the N6BV (may be actually Dave Leeson) modifications? Thanks. -- Eric K3NA ___________________
Some thoughts, in order of potential benefit: -- Be sure the antenna is weight and torque balanced. This is by far the most common problem I see with antenna installations. An antenna just a couple i
I am curious about the use and design of an unusual high power, low band antenna which I saw recently while cycling in France. I wonder if anyone knows anything about it. The site is close to N89, ab
Photos of the mystery antenna were graciously posted by Kirk here: http://www.k4ro.net/k3na/ Thanks, Kirk! Maybe this will help the curious figure out what this system is all about. 73, -- Eric K3NA,
Yes, that is the correct site. Interesting: the web page says "300 kW omnidirectional" but the open wire line off the top of the tower seems like a passive reflector. on 06 Jun 22 Thu 14:42 Jan Erik
When placing a stack control box at the base of a tower, one should consider using equal length coax to feed all the antennas in the stack -- not just a convenient even (or odd) multiple of a half-wa
Back in the 1980s a group of PVRCers bought a hand-operated Nicopress tool. As someone else described in an earlier e-mail, it was expensive... and had arms about 3 feet long. I built two AB-105 towe
Cold shrink (available from a variety of sources including http://www.sitepro1.com/store/cart.php?m=product_detail&p=426) is somewhat less expensive. This is the typical tradeoff: time vs. money. Spe
Yes, I saw a tram line part and the results were not pretty. The person operating the winch narrowly escaped injury by the antenna and by the parted line. This occurred early in my ham antenna career
Hard to draw a diagram on a text-oriented reflector. If you read this message with a fixed width font it should work reasonably well. First, the tram line in this diagram is like the gondola lift you
Dick -- Comments marked within your text. -- Eric on 06 Dec 19 Tue 15:19 Dick Green WC1M said the following: The winch should be relocated to a different spot off to the side, away from the tower bas
Hi Dick -- First, definitions... A capstan is not a winch. A "capstan", as you have, contains a drum around which several turns of rope are laid. As the drum rotates, new turns are added to the drum