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512 links - and 2 categories

Experiments with 160m antennas - Experimentin wire antennas on top band using several type of aerials. This includes a 40 to 160 meters EndFed Half Wave kite antennas and 160m/80m loaded vertical antenna.
[ Hits: 177 | Votes: 0 | Rating: 0 ]

20 meter short loaded vertical antennas - Loading is a way to lower the resonant frequency of an antenna radiator. This technique is typically used in antennas that have radiating elements that are too short for the desired resonance frequency. In this excellent article the author experiment loaded vertical dipoles for 20 meters band
[ Hits: 232 | Votes: 1 | Rating: 9 ]

Make a Compatct Dipole for 7 MHz - This article demonstrate how to build and mount a 40 meter loaded dipole using basic materials. This antenna reduce the overall length of an HF dipole through the use of loading coils.
[ Hits: 216 | Votes: 0 | Rating: 0 ]
Half-Length Dipoles for 40 Meters - Complete collection of the four main parts of this excellet research on modelling and designing half wave dipole antennas for 40 meters band, covering all aspects beginning from full wave length antennas, to shortened, loaded and reshaped dipoles
[ Hits: 382 | Votes: 2 | Rating: 10 ]

50 MHz CLC antenna - A small antenna for 50 MHz made with copper cable loading coils
[ Hits: 249 | Votes: 0 | Rating: 0 ]

80m Shortened Dipole Antenna - This antenna just requires about 24m of free space instead of 41m that a normal half wave 80m antenna needs to hang up. The so called loaded dipole uses a coil in every dipole arm to electrically lengthen the mechanical too short dipole arms. Every coil has an inductivity of 120 microHenry.
[ Hits: 154 | Votes: 0 | Rating: 0 ]

Loaded Quarter Wave Antenna Inductance Calculator - Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The calculation refers to either a loaded 1/4 wave or a loaded dipole
[ Hits: 163 | Votes: 0 | Rating: 0 ]
Coil-Shortened Vertical Antenna Calculator - You can shorten a vertical antenna by using a loading coil. This online calculator tells you how the amout of inductance your loading coil will need to have.
[ Hits: 312 | Votes: 2 | Rating: 5.5 ]

Loading of Short Antennas - An interesting article on loading short vertical monopole antennas, representing six different methods. Base loading, Center Loading, Top Loading, Continuous loading, half and half loading and capacitive top loading.
[ Hits: 682 | Votes: 4 | Rating: 6.25 ]

80m-40m Loaded Dipole - A dual band dipole antenna for 40 and 80 meters band. Total lenght of 26 meters, foreseen two coils at aprox 11 meters distance from center feed.
[ Hits: 254 | Votes: 4 | Rating: 5 ]

Multiband End-fed 80-10m Antenna - A multi band antenna for HF band capable to operate from 10 to 80 meters band depending on wire lenght loaded with a small inductance neat the feed end.
[ Hits: 367 | Votes: 2 | Rating: 6.5 ]

Short Multiband Dipole Array - A multiband shortened fan dipole. This page offers and online calculator that can be really useful if you plan to homebrew a multiband dipole for low HF bands and you don't have all needed space for the full lenght. It combines multiband dipole with loading coild for selected bands.
[ Hits: 229 | Votes: 0 | Rating: 0 ]

Linear Loaded Dipole for 15m and 20m - A small dipole antenna installed inside a balcony. This linear loaded short dipole antenna has been designed at first for the 21 MHz and then adapted for the 20 meters band.
[ Hits: 625 | Votes: 2 | Rating: 4.5 ]

FCC Callsign Database Script - This is a Bourne Shell script that will automagically download the FCC Amateur Radio license database, parse it, and populate a MySQL database. The database can be searched using the command line and is very fast.
[ Hits: 146 | Votes: 0 | Rating: 0 ]

Ham Cockpit - Ham Cockpit is a program of a new type. All of its functions are implemented in the plugins, the main program simply loads the plugins and helps them work together. Ham Cockpit is an integrated environment for a Radio Amateur that every user can build according to his needs. It can work as SDR client, a logger, a cluster monitor, a propagation prediction tool, or have any combination of these working together.
[ Hits: 429 | Votes: 0 | Rating: 0 ]

WSJT DX Aggregator - WSJT DX Aggregator is a program that allows the stations using the WSJT-X or JTDX or MSHV programs to automatically upload DX reports to DXMAPS.com
[ Hits: 137 | Votes: 0 | Rating: 0 ]

Antenna Switch - An home made antenna switch with a Dummy Load selector. If you forget the radio is connected to the open or grounded side of the switch and you try to transmit, it is very easy to damage the finals of your transceiver.
[ Hits: 320 | Votes: 3 | Rating: 8 ]

RF Impedance Matching Calculator - Calculates the network to match a line to a specific complex load. This online tool calculates the matching network necessary to terminate a line of the specified characteristic impedence Zo in a specific complex load impedence RL + jXL at a specified frequency.
[ Hits: 194 | Votes: 1 | Rating: 10 ]

Dummy Load Construction - This will document a custom version of the K4EAA Dummy load done using 20 1K ohm 3 Watt Resistors, Piece of brass sheet, a quart paint can and a BNC connector
[ Hits: 187 | Votes: 1 | Rating: 5 ]

Juma Keyer1 - Miniature PIC microcontroller based keyer kit with convenient modes. The kit includes PCB, componets, knob and ready programmed PIC microcontroller. Author make available from his web site Circuit diagram, Component layout,List of components and downloadable Software
[ Hits: 101 | Votes: 0 | Rating: 0 ]