Got a nasty situation here that needs some brain power to resolve. Earlier this year, I poured two base piers for a pair of Pirod self-supporting towers. The 140 ft. tower base has the problem. Unfor
The issue is not just removing the template. I could just cut it off. I need to KNOW that the template can be removed without to ensure that the tower base will go on without difficulty. We can't be
one at the normal location and a second at the top of the bolts.": Amen. After seeing the problem on the day after the pour, you could hear me swearing at Pirod Engineering for not specifying two (2
Steve, no question...any amount of bolt height reduction does get me closer to the right distances...and that will make the base section easier to install. It's certainly one solution to consider, a
I should also mention that after working with several crane operators, they detest using their gear for any purpose other than to lift and place. For example, they will not use the end of the boom fo
Wilson, You're probably right! However, jacking the feet apart at the base section then creates a permanent problem if the tower is moved. The template is of no use and Pirod cannot make a second tem
Bottom legs will be a minimum of 2.5 inchs..and solid. Typ 2.5 to 3.0 inches. Pirod is known for its solid legs. Im guessing base is 6-8 ft across, each face..maybe more. Dunno if its in 10 or 20 ft
into the shape of a "J", but OTOH, the installer cannot put a very slight bend into them." Good question. They're only called "J-Bolts." In reality, nothing is bent when used on the larger bolts for
could only find one eval on eham by W4AN (SK) so years ago. Thanks," Yes, N4CC and I use one at our remote site. It's a 40M3FS with a second director added that turns it into a 40M4FS OWA. Height is
Back in July, I reported on a problem I had with a 140-ft. self-supporting Pirod tower. Thanks to the efforts of a couple local area farmers, they used the hydraulics from two tractors to bend six ba
Jeff, Not sure about your time line, but if you're not in a rush, you can often find surplus Harger pipe ground clamps on the web and the big auction site. New pricing is kinda' steep through Graybar
The November, 2017 issue of QST has an article titled: "The 75-Meter Dipole Stretcher." As one might guess, it's the author's fix for the age-old problem of attaining reasonably low SWR from a dipole
A correction to my original post: "At 3.6 MHz, the dipole's complex Z is 65.1-j113" should read 65.1-j131. I must have suffered from dyslexia last night. After posting, I ran the same model using RG-
half wavelength line is only a half wavelength at one frequency, presumably the center of the band. As you tune away from that frequency, the 1/2 wave line is no longer just an attenuator as you rep
compression lugs plus antioxidant between surfaces for all bonding wire terminations. I think the idea with two hole lugs is to prevent loosening of a single bolt attachment from movement of the wir
electrodes but I would never use them on the tower itself. It may be possible to safely weld a connection to a tower but I wouldn't do it to a tubular load-bearing leg, not to mention the dissimilar
John, See my message from a few days ago: http://lists.contesting.com/pipermail/towertalk/2017-October/158208.html You can use these same pipe clamps with a 1/4-inch SS stud for attaching your coppe
Jeff, Here's a link to a Seapac presentation on NEC Article 810 and amateur radio. Start around p. 26. https://www.seapac.org/documents/seminars/2013/2013-Kuhlman-Applying%20the%2 0NEC%20to%20Amateur
Just use a larger clamp in the same Harger product line: http://lists.contesting.com/pipermail/towertalk/2017-October/158208.html Paul, W9AC Today, that means a Ufer ground - 20 ft of conductor embe
my inverted-l.? As long as I start a sweep at 1.7 MHz or above I have no issue with them." I have a nearby 50KW AMBC station a few miles to the south of my remote site. With the Array 2180 and N2PK