The effect varies depending on ground conductivity, but will be relatively slight. Do what you can, get on the air, and have fun. 73, -- Eric K3NA I've just put up a 160m vertical but I can not put r
There appears to be some confusion on the topic. The vibration modes under discussion are vibrations in an element usually associated with very LIGHT wind. I have personally witnessed this close up.
Galling of stainless steel hardware can be prevented by using anti-seize compound. Suitable compounds are available at auto supply stores. Not sure what you are trying to hold. If you are trying to k
Some general suggestions as a starting point: 1. Sell the tribanders. With just three towers, they really can't help you much and will certainly interact with everything else. If you can build taller
I saw this happen on a tower where the anchor did not have a forged eye, but terminated in a threaded section. A forged eye had been attached with a threaded coupling. The coupling was pinned in plac
Hi Jim -- Are you familiar with the database that Dean Straw N6BV has compiled in the "ARRL Antenna Book"? Dean's database is far better for your purpose because is does NOT impose a radiation patter
I moved recently to Boston. When working with the telephone company engineers to install my phone service, I noticed that my network interface unit contained an unusual, non-sticky, clear, semi-solid
What happens with the adhesive when you re-open the connector? Is it a true glue, or can it be cleaned off? Re: snot. Ask your telco friends what it's really called and where it comes from, if you ge
One can also increase the finger space around connectors by not lining them up in a square grid of rows and columns. Rather, shift each row left/right so that the connectors in that row are mid-way (
Chris -- I think you were originally looking to do a 20m high vertical (i.e., quarter-wave on 80m). My observations about your ideas: Electrical conduit is a relatively soft steel not designed for st
Hi -- Where would I find measurements for baluns at various frequencies when attached to a mismatched load? I'm specifically interested in: 1. Balun types of interest: -- the coil of transmission lin
A very convenient way to adjust antenna tuners is to use a handheld impedance analyzer as the signal source. I happen to use an AEA CIA-HF, which can graph the SWR across the band. Not only can I see
Grant Bingeman KM5KG's network analysis software can be set up with the configuration of load impedance, feedlines, and tuner settings. It will show internal currents and voltages as well as projecte
I have done a NEC-4 study of forked radials vs conventional radials, using different forking locations and numbers and lengths of the radials (before and after the forking point). The bottom line is
I can add a third instance. I had a KT-34XA at 130ft on a mountain ridge 1500 ft above average terrain in Maryland. After an ice storm built up 1.5" radial ice, the 90 km/hr winds that followed destr
Actually, "sealing current" was not used for relay contacts. Sealing current is still used today, in the time of digital telephone switches (with no relays). One evening over coffee at a technical st
If memory serves me correctly, there is a PolyPhaser product that will allow DC voltages to be applied to the coax (and protect the DC source or sink as well). That would seem more appropriate and al
Today I called the engineers at Preformed Line Products. At the end of my work-oriented discussion, I said: "Hey, maybe you can answer another question that has nothing to do with my project. I have
I am not a specialist in metal work. However, I would be nervous about heating metals. According to reference books, certain types of metals are produced through a combination of alloying and heat tr
A stretch of garden hose (or several hoses connected together, or any other length of tubing) makes an excellent elevation measuring device. Lay it out along the ground with the ends sticking up in t