j antenna frequency

32 links

ZMV Spiral antennas - An experimental antenna similar to the TAK spiral antenna was evaluated for SWR response over the frequency range of 7.0 to 7.3 MHz, or the 40-meter band.
[ Hits: 3431 | Votes: 8 | Rating: 5.37 ]

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 ]
Slim Jim antenna calculator - How to make a simple but effective Slim Jim antenna. It includes a calculator to work out all the mesurements for the frequency you require.
[ Hits: 9155 | Votes: 78 | Rating: 5.43 ]
Center-Fed Wire Dipole Antenna Tuning Calculator - Ever need a way to estimate the amount of wire to add to or remove from a center-fed wire dipole antenna to achieve resonance at a desired frequency? This article help to determine correct wire lenght.
[ Hits: 1009 | Votes: 7 | Rating: 2.86 ]
Cubical Quad Calculator - An online javascript calculator for cubical quad antennas, simply input the resonating frequency to calculcate up to a five element quad antenna. This quad antenna calculator let you determine the total length of each element and spacing among elements.
[ Hits: 1011 | Votes: 20 | Rating: 7.25 ]

Comparison of Beverage antenna - A ranking of receiving antennas based on noise being evenly distributed in all directions. These rankings are most accurate in the frequency range of AM broadcast, 160 or 80 meter bands
[ Hits: 2855 | Votes: 2 | Rating: 6.5 ]

From Transmitter to Antenna - A collection of articles on the subject of impedance, impedance matching and high-frequency power transmission by G3YNH
[ Hits: 1159 | Votes: 0 | Rating: 0 ]

Antennas of Field Day - Main High Frequency Antennas from the 2009 LARC FARL Field Day, Ford Amateur Radio League. A document comparing antenna performances and flexibility among a G5RV an Carolina Windom and a Cushcraft R7 vertical antenna.
[ Hits: 413 | Votes: 0 | Rating: 0 ]

Broadband receiving antenna matching - This article addresses the subject of obtaining the best signal transfer from an antenna to the typical 50-ohm receiver input over a wide frequency range, with emphasis on medium-wave (500 - 2000 kHz), encompassing the standard AM broadcast band and the 160-m amateur band.
[ Hits: 6689 | Votes: 4 | Rating: 6 ]

Measuring 2.4 GHz Helix Antennas - It is not very difficult to design and make a helix antenna for a specific frequency and gain. It is more difficult for the serious experimenter to make precise measurements of the finished antenna.
[ Hits: 748 | Votes: 5 | Rating: 9.2 ]

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 ]
Tuning HF Coaxial Antenna Traps - The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency.
[ Hits: 1963 | Votes: 2 | Rating: 4 ]

Tenna Dipper Kit - The "Tenna Dipper" is a low power antenna analyzer and ATU tuning aid. With this handy accessory, you can determine the 50 Ohm resonance frequency of antennas or you can adjust your antenna tuner for a 50 Ohm match without generating QRM
[ Hits: 4037 | Votes: 4 | Rating: 3.25 ]

VHF/UHF Yagi Antenna Design ^pop - Design your VHF UHF Yagi antenna online, a JavaScript enhanced web page that implements the design of an antenna for 2m and 70cm bands. This page offers a streamlined experience for Yagi antenna design enthusiasts. It assumes prior knowledge of Yagi design principles, minimizing distractions with a user-friendly interface. Equipped with essential equations, it provides instant design feedback. Red font warnings indicate design limitations, ensuring practical results. Constraints include Gain (11.8-21.6 dBd) and Boom Length (2.2-39 wavelengths), with additional frequency-dependent restrictions noted in input fields.
[ Hits: 147433 | Votes: 1105 | Rating: 6.95 ]

VA3GRR - Radio Beacon - VA3GRR is a radio beacon, operating on the 10 meter amateur band. Its frequency is 28.205.5 MHz. It runs just under 5 watts of power into a vertical half-wave ringo style antenna
[ Hits: 476 | Votes: 1 | Rating: 10 ]

J Pole calculator ^pop - Enter the operating frequency and calculate dimensions of your jpole antenna
[ Hits: 49473 | Votes: 184 | Rating: 6.36 ]
HF Beam Calculator - A javascipt online calculator for 2 and 3 element beam antennas. Just input frequency and will diplay element dimensions and spacing. Measurements in Feet and Meters by G4VWL
[ Hits: 3438 | Votes: 27 | Rating: 5.45 ]

IBP - Beacon Monitor - Linux program that helps one with monitoring the beacons of the International Beacon Project, by continuously showing which beacon is transmitting on which frequency, along with the distance and antenna directions by PA3FWM
[ Hits: 1491 | Votes: 2 | Rating: 5.5 ]

CI-V based remote antenna switch - An home made remote antenna switch project capable to read the current working frequency from the radio and to change antenna accordingly
[ Hits: 490 | Votes: 0 | Rating: 0 ]

Arduino automated antenna switch - This Arduino project decode ICOM CAT frequency information and switch antennas according to preset values. RX and TX antennas can even be different, a project by ON7EQ
[ Hits: 3013 | Votes: 4 | Rating: 9.75 ]