observations. I'm sure that empirical observations (1910, 1920) showed the bandwidth increase (as all of you running a flattop T antenna from your Alexanderson alternator on Straight Key Night did).
Jim, I'm not normally one for going against a manufacturer's assembly instructions, but K6MHE's installation method with a reducer is vastly superior to that suggested by Amphenol. It works especiall
From the K7NV website: "...after this is cured the gears and open bearings are packed with a waterproof lube for life rated grease." N4CC and I own several prop-pitch rotators, all rebuilt by K7NV. I
Pete, You'll pretty much be required to model it to get any semblance of accuracy. The T will produce a more symmetrical azimuth pattern than an inverted L and will also do a better job of canceling
I collect old QSL cards, most of which date from the early 1920s when card exchange became popular. I recently spotted a card that's currently on eBay. The card shows the station of W. Wright Mitchel
The Nylon rope is an insulator until gets wet, collects, decays and collects more stuff with UV exposure, etc. Assuming your fan dipole is a half-wave on all bands -- and it should be, keep in mind t
https://budwigmoldedproducts.com/antenna-connector-and-insulators/ Paul, W9AC The Nylon rope is an insulator until gets wet, collects, decays and collects more stuff with UV exposure, etc. Assuming y
Possibly 4Nec2. I use a DOS .EXE file console inside 4Nec2. The file was included on the LLNL CD-ROM for NEC 4.2. For 4Nec2, I have no idea if it's as simple as changing the .EXE file. That will be s
Contact Valmont at 402-359-2201. They own the PiRod tower line. Valmont has the means to quickly provide sq. ft. loading specs based on the top and bottom sections. Their structural engineers were v
In my case, it's a fight with the local farmer who tedders the field for hay several times a year. The teddering machine sometimes gets down a few inches below the soil surface. Last season, the rad
My X50A has been up for 25+ years. I live in a HOA and so it was necessary to camouflage it. In the early '90s, I began using Rustoleum flat-black charcoal grill spray paint. It seems transparent el
you want. There are too many installations that are far removed from what the manufacturer can do to produce the graph." OTOH, to cover yourself as a manufacturer, the SWR graph can be expressed as
As a point of observation, measured SWR of our full-size M2 4L 40m Yagi is 1.1:1 at 7.0, rises to 1.3:1 at 7.1, then peaks to 1.5:1 at 7.2. As expected, it drops back to 1.3:1 at 7.3 owing to the le
Hallas W1ZR, states that a 180 degree base fed vertical monopole needs no ground system, only "short counterpoise rods, which look like radials but are usually only 4-6 feet long, to provide a conne
only about 700 >miles. I suspect that change may be the reason that 5/8 towers were shortened -- the 5/8 tower has a broad, strong lobe that peaks at about 55 degrees and may fill in skip zones." Th
Another good RG6 variant is Belden 1829BC. It's gel-flooded, solid copper inner, braid + foil. Works well with PPC and T&B Snap-N-Seal type connectors. I selected it for use in a DC power-passing ap
VE1ZZ did the same. See p. 31, Feb. 1996 QST. Paul, W9AC The late W0AIH used to splice hard line by bending the two ends upwards, connecting the shields and center conductors, and slipping a plastic
Jack, VE1ZZ mostly operated on 160m. Unless it's part of a directional array, I wouldn't even bother to sweep the line at 1.8 MHz unless something was terribly wrong and I doubt he did either. Jack
RF Industries sells an excellent RG-213 crimp, model RFU-507-ST. It's silver/Teflon and carried by commercial suppliers like Tessco, DigiKey and Richardson RF. It's at least the equivalent of Ampheno
Yes. In a past life, I installed 300 ft. of Rohn 55 tower in northern Illinois. The concrete base and rebar cage was to Rohn spec. As the concrete cured, I inserted the pin into the concrete. It onl