I'm sorry my previous comment about stainless steel screws was unclear. I'll try again. Yagi builders commonly use rivets, self-tapping stainless steel screws, or hose clamps to join and secure teles
Tom, Its particularly difficult to maintain corrosion-free joints in verticals constructed of telescoping tubing. Inevitably, rain water washes through the joints and oxidation develops despite preve
W8JI posted a classic reply to this question nearly ten years ago. Not coincidentally, sixty 1/4 wavelength radials have since become the defacto standard among serious 160 meter DXers. Here's a brie
Regarding the cost effectiveness of using CNT-400 (or LMR-400) vs RG-213 (or similar solid dielectric 50 ohm cables): LMR-400 has only about 0.4 dB less loss per 100 feet at 28 MHz than RG-213. It wo
W6KPC 36 element 20 meter stacked Yagis: http://db0spc.myvnc.com/df7pw/images/W6KPC-2.jpg _______________________________________________ _______________________________________________ TowerTalk mai
A photo of Yagi is located at: http://jplarc.ampr.org/calling/1996/feb/bigyagi2.jpg Modern Giant Yagi Excerpted from "Antennas and Propagation," June 1991 What may look like six separate HF yagi ante
Hi Don, You forgot to include the gaps between each boom segment in your calculation: Six 9 meter boom segments -- plus five 9 meter gaps -- equals 99 meters 73! Frank W3LPL -- Original message -- __
Billy is correct, VE6JY's antenna is an OWA Yagi, using the classic two element OWA driver system. One element is a driven element and the second element is a tightly coupled parasitic element whose
See: http://www.arrl.org Court Finds FCC Violated Administrative Procedure Act in BPL Decision (Apr 25, 2008) -- The US Court of Appeals for the District of Columbia Circuit today released its decisi
Dick, I've had excellent success with my OR2800 rotators over the last ten years. One turns a 5 element, 48 foot boom, 20M monobander at 200 ft and the other turns a 6 element, 48 foot boom, 15M mono
Dan, I have thousands of feet of direct buried cables, in use since 1986, including many runs of Heliax, other types of hardline, and direct burial type UF cables for rotators and switching. The key
Dan, I've used thousands of feet LDF4-50, LDF5-50 and LDF7-50 Heliax without issue, both direct buried and on dozens of tower runs of up to 200 feet. Its safe to say that many, many millions of feet
Bob, The cast aluminum Ham 4 lower mast mount W I L L F A I L if you install a 10 foot steel mast and beam above it. You can mount a long mast with a top-mounted beam on a Ham 4, but only if the Ham
I've been using fiber for years to isolate my AR Cluster computer (always on 24/7) from the rest of the network. 100 Mbps Ethernet optical transceiver are readily available and inexpensive (try eBay)
http://www.preformed.com/artsfest/files/AppProc/SP2049-3.pdf "After original installation, Big-Grip dead-ends may be removed and reapplied two times, if necessary, for the purpose of retensioning gu
Hi Tom, Your question has been discussed many times on TowerTalk. Coaxial lines can NOT simply cut coaxial lines to produce 72 and 80 degree phase delays in an array of phased verticals, because the
Here's the URL for Peter Viezbicke's description of the WWV HF antennas: http://tf.nist.gov/timefreq/general/pdf/1420.pdf 73 Frank W3LPL _______________________________________________ ______________
My guy insulators flash over whenever a thunderstorm is within a few miles, well before the thunderstorm arrives. It makes an awesome light show. My four 200 foot towers on highly exposed terrain sur
Tom, Each tower has at least one 8 foot ground rod, and the tower foundations are also Ufer grounds. All guy anchors use eight foot galvanized steel rods directly in contact with the Earth. I do not