With a 9:1 endfed, you don't want it to be a 1/4 wavelength at any band.
Sep 8, 2021 · Here are some comments from Kevin: oin me in building a new simple ultralight Antenna for going portable.
By attaching the center conductor of a coax feedline to the tubing, and the shield of the coax to a couple of radials from the base of the tubing you can load the vertical across quite a broad range of frequencies.
Antenna length based on the following formulars: 1/2 λ dipole (feet)= 468 / frequency in Mhz.
200: 32. The blue line is the result of the metric formula (the formula for Imperial units is slightly lower in frequency). .
For example, some hams have reported choosing a 20%-80% split in conjunction with a 4:1 current balun, providing a usable antenna on 80, 40, 30, 20, 15, 12, and 10 meters, with SWR readings less than 2:1 on these bands. 350 MHz, 25W SSB/CW, 12. frequency of my 20m Loop antenna is 14.
First adjust the 20m section, cut both ends carefully till resonance on centre of band. The diagram at the right shows some of the details of the Novice 90.
For 40m the frequency is 7.
In theory, it’s possible to connect any half wavelength or a multitude of these to the transformer in order to get a resonant antenna. .
The diagram at the right shows some of the details of the Novice 90.
Here is a handy chart for determing 1/4 wave verticals, 1/2 wave dipoles, and full wave loop lengths. . 91: 16.
40m, 33 ft. 40m, 33 ft. 6. Cut. 1 Answer. 32 / frequency in Mhz.
: 80m, 67 ft. .
17m, 13 ft.
Oct 22, 2008 · In 1981, long before the commercial versions appeared, I made a 43' vertical, as that length makes it a 5/8th wavelength on 20 meters.
A beam type of antenna at a height of 70 feet or more will provide greatly superior performance over the same antenna at 35 feet, all other factors being equal.