resonant

61 links - and 2 categories

80 Meter Pizza Pan Antenna - This is a resonant, half-wave, vertical antenna. It takes up little space in the back yard, was designed for operation on a single frequency 80 meter PSK net, and is reasonably inexpensive to construct by Chuck Hines, K6QKL
[ Hits: 3724 | Votes: 3 | Rating: 5 ]

Dipole and Inverted V Antenna Calculator - Enter the resonant frequency for the dipole/vee antenna calculation
[ Hits: 17185 | Votes: 66 | Rating: 5.08 ]
Loop antenna resonant frequency calculator - Calculates resonant frequency of a loop antenna, correcting for distributed capacitance.
[ Hits: 11417 | Votes: 54 | Rating: 4.16 ]
Dipole Calculator in JavaScript - Input the desired resonant frequency and it will calculate lenght in inches feet and meters
[ Hits: 4718 | Votes: 20 | Rating: 6 ]

WB6ZQZ 3 in 1 Balun - Builing a triple ration balun, that match resonant antennas from 9 ohms to 75 ohms with 1.5:1 or less SWR
[ Hits: 6490 | Votes: 7 | Rating: 7 ]

CobWeb multiband folded dipole - The cobweb antenna it is basically a 5 band antenna comprising of 5 full half wave dipoles for each band - between 10 meters and 20 meters, the antenna is also resonant on 6M and can be modeled even for VHF frequencies.
[ Hits: 8631 | Votes: 0 | Rating: 0 ]

End-Fed Halfwave Antenna - The end-fed halfwave antenna is a resonant half wavelength long antenna like a dipole antenna except for it is fed at its end rather then in the center. This antenna is as old as radio and is probably best known as the Zepp Antenna
[ Hits: 24209 | Votes: 18 | Rating: 7.55 ]

SkyWire horizontal loop antenna - A Wire resonant loop antenna for 160 meters band article by N4KC
[ Hits: 1036 | Votes: 2 | Rating: 9.5 ]

Thinking about Ideal Loops - Loop antennae have been used from ELF to UHF since the beginning of radiocommunications. At low frequencies, the main problem for loop antennae is to have enough sensitivity; the antenna being very small respect to the wavelength the collected energy is also small. To increase the output level the loop may be made resonant, so loosing it%u2019s intrinsic aperiodic characteristics.
[ Hits: 2271 | Votes: 6 | Rating: 7.33 ]
Length of a Resonant Square Quad Loop - Calculating the length of a resonant square quad loop
[ Hits: 1033 | Votes: 1 | Rating: 10 ]

Vertical antenna for Vacation - Vertical Vacation Antenna for 80, 40 and 20 Meter-Band, by Herbert OE3BMB This antenna is a full size λ/4 for 20m and 40m band, and a shortened λ/4 for the 80m band. Generally on the 40m band the SWR is under 1,6. In 80m and 20m band at the resonant frequency the SWR is about 1,1.
[ Hits: 5037 | Votes: 4 | Rating: 8 ]

Petlowany Antennas by K6NO - WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
[ Hits: 3765 | Votes: 9 | Rating: 6.22 ]

DCTL Antennas and other compact antennas - The Distributed Capacitance Twisted Loop is an inexpensive, effective, resonant alternative that can fit in a 8' tall by 12' or so wide space, like a wall, or balcony, even on 80 meters. 160 meters from an apartment, a full wave look and a cage dipole
[ Hits: 4409 | Votes: 1 | Rating: 5 ]

Optimizing Inductors - While intended mainly for antenna loading coils, this article also applies to other resonant systems, such as amplifier tank circuits.
[ Hits: 552 | Votes: 1 | Rating: 10 ]

Building Coaxial Traps - This page describes the design and construction materials W8WWV used to build a coaxial cable trap. A coaxial cable trap is a parallel resonant circuit that is usually inserted in an antenna element to enable multiband operation.
[ Hits: 10272 | Votes: 5 | Rating: 8.2 ]
Multi Band Antenna Traps - These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance.
[ Hits: 4851 | Votes: 3 | Rating: 6 ]

W3DZZ multiband dipole - The multi-band trapped dipole is resonant on approx 3.7, 7, 14, 24 7 28.5 Mhz. The overall top length needs to be approximately 32.9 Meters
[ Hits: 10473 | Votes: 20 | Rating: 6.9 ]

Resonant Frequency: The Ham Radio Podcast - blogger - This was the blogger home page of the Resonant Frequency podcast. Follow the link to get to new web site.
[ Hits: 1219 | Votes: 5 | Rating: 10 ]

NI4L Dipoles - Custom resonant dipoles
[ Hits: 2630 | Votes: 8 | Rating: 8.63 ]

Troubleshooting Traps - This article refers mainly to the old Cushcraft 1/4 wavelength AV series of antennas (12AVQ, 14AVQ etc) hence the references to radials. The R series (R5, R7 etc) are 1/2 wavelength antennas, and the radials are NOT 1/4 wavelength resonant.
[ Hits: 2777 | Votes: 0 | Rating: 0 ]