DX Atlas 2.25

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DX Atlas 2.25

Electronic world atlas for radio amateurs. Scrollable world map with smooth zoom, dxcc territories, province/state prefixes, grid squares, cq and itu zones

post 30 Jan 2024

DX Atlas 2.25

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Great Circle Calculator
calculator of bearing and distances

MU-Locator
This program searches a prefix or country in a database

Palm Globe A World Globe for Palm OS
Palm Globe is a program which displays the Earth as a globe

Linear-loaded-short-dipole-21mhz

Linear loaded short dipole 21Mhz For my amateur radio activities on the HF bands I only have a 3.6 m wide balcony available for antennas. After some study I decided to experiment with a shortened dipole for the 15 m band

Rx antennas 4Square Rx Vertical Array

Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m

A simple SWR Meter is to be used at HF

A simple SWR Meter is to be used at HF An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated

Filtro Passa Basso anti TVI per HF Adottare l'installazione di un filtro passa basso all'uscita della catena trasmittente

40m Moxon Antenna The input impedance of our antenna is 50 ohms, balun 1: 1. with coaxial RG213 of 15 cm in diameter and 5-6 turns from the winding

4 elements Yagi 10 meter band For 28.000 - 29.000 MHz 4 elem. boom 3.83m long

Sequencer with cw memory keyer The tuning is simple unscrew nuts and move the clamps up or down until you get the SWR correct

Moxon 433 mhz This is an intriguing antenna. Compared to a full-size 2 element yagi it is much smaller, yet gives comparable performance

30-40 Meter Vertical

30-40-meter vertical I built this antenna specially to be used on the 30 meter band. The coil used is big enough to cover the 40 meter band as well. The coil is a bit over kill to just run 200 watts through it, but it was given to me. This coil came from a broadcast transmitter

40m 2el Yagi linear load

40m 2el Yagi linear load This 40m yagi, which shows very high performance on our tests, isn't ispired from any other model. Lots of yagi models are analyzed and this model figured out. The most spesific part of this model is having belove 1:5 SWR value and 175 khz bandwith

Antenne-long-wire-balun-9.1

Antenne-long-wire-balun-9.1 La Long Wire rappresenta un buon compromesso che permette di avere un’antenna multibanda