This is an exceptionally rare find, perhaps never to be found ever again since it was last manufactured nearly 40 years ago. This new (old stock) Granger heavy duty 24 inch face-width tower is still
Hank, There were three versions of the AB-105 tower, the most recent production was AB-105C. Diagonals for AB-105C were constructed from 1 1/2" by 3/32" steel strip, stamped into a 90 degree angle, e
The entire AB-105C/FRC Technical Manual is available online in PDF form at: https://www.logsa.army.mil/etms/data/A/028953.pdf 73! Frank W3LPL donovanf@erols.com the any ______________________________
Of course, stranded wire can't work! Whoever quoted me wasn't listening carefully, has a fading memory or both... The proper message is: Many professional antenna installers use #14 THHN solid copper
Hi Mike, I'd expect the interaction between the 3 element 20M monobander and the log to be severe unless you can space the antennas at least 30 feet vertically. Both antennas would be severely degrad
I've used gamma-matched Yagis for many years. I still have three gamma-matched 20 meter Yagis and my remaining 18 Yagis are T-match fed. All have been trouble-free for over 10 years. Over a fifteen y
Jim, You should be aware that Guy-Grips and Big-Grips are not the same product! The manufacturer recommends Big-Grips for towers. 73! Frank W3LPL For safety and long life [the towers and yours] you w
Regarding the misguided recommendation posted last week that Guy-Grips be used on tower guy wires, the Preformed Line Products web site specifically recommends use of Big-Grip preforms on guy wires u
Keith, This is your friend's lucky day! A few days ago a friend deposited on my doorstep a large box of components from his old KLM monobanders and tribanders. Right on top is the exact part he's loo
Doc, For comparitive purposes, Dillsburg Aeroplane Works in Dillsburg, PA sells 2" od x 0.188" wall 4130 Cr-Mo tubing for $9.00 per foot. This is raw Cr-Mo steel, not galvanized. If you do not galvan
Jack, I do not have any Rohn 65 for sale; however, I do have for sale a large quantity of new, heavy duty, 24 inch face-width tower manufactured by Granger Associates (Model 789-4). The strength of M
Station ground bus bars are an obsolete grounding practice, modern design practices provide far superior AC power safety and lightning protection. Grounding serves several purposes, including: - elec
Station ground bus bars are an obsolete grounding practice, modern grounding design practices provide far superior AC power safety and lightning protection. Grounding serves several purposes, includi
You should focus your efforts on designing and constructing a low impedance grounding window at the location where your cables enter your home. All cables entering your home should be bonded to the g
I was very sorry to hear about the severe damage to N9RVs antennas in the recent ice storms that recently affected many parts of the U.S. I know Pat worked very hard to build his excellent station, a
Hi Rich, Don't forget that you must use a massive concrete base for a self-supporting tower. With the amount of land you have, it would be far cheaper and easier to use guys! 73! Frank W3LPL donovanf
Several posts in this thread made reference to the use of braided bonding straps in grounding systems. One post even provided photographs that showed his use of braid in his station. Braid should nev
Hi Jim, Here's another one to add to your list: Discard all forms of "braided" cable. Braid is something a girl does to her hair. It is not a good RF ground and it's a terrible conductor for lightnin
Here's a clarification, pointed out by an attentive towertalkian: My previous e-mail was not intended to refer to cables that use a braided shield under a jacket. A tight jacket compresses the braid
Alan, There's a very important reason for bonding multiple ground systems (for example, your AC entrance panel ground and your ham station single point ground) with low RF impedance conductors. You n