Author: sq2bxi

Zespół w składzie SP5WPK, SQ2BXI i SQ5BPF postanowił przeprowadzić eksperyment z dużą poziomą anteną pętlową jako anteną nadawczą w zakresie VLF. Celem eksperymentu było sprawdzenie czy taka antena nadaje się jako antena nadawcza do pracy w zakresie VLF tj. 8,27kHz.

Continue reading “Nadawczy eksperyment z dużą poziomą anteną pętlową na 8,27kHz”

Encouraged with the outcome of latest earth dipole tests I decided to continue testing of those interesting antennas.

This time, however, I aimed at:

1. testing the possibility to transmit in 136 kHz
2. checking how a good quality electrode will impact the antenna
3. confirming that an earth dipole can work effectively above the ground with low resistance
4. testing an antenna of this length to be able to receive signals at the lower end HF

I used a 0.6 mm copper plated steel pole (due to cost and no alternatives available). Resistance for the pole was over 1kOhm. The cord was spread across the field lying on the grass or in the bushes at the height of 0 – 2 meters above the ground level.

Continue reading “A bridge on the Vistula river as an element of an antenna – earth dipole tests continued”

Mode QRSS100, 137.777 kHz frequency, received signal “MX HNY”

On the 476,180kHz frequency, with the power of the 50W transmitter, the IQ2MI beacon works.
The radio beacon is well received in the evenings in Poland.

More info on page:

IQ2MI – 500 Khz

 

Stefan DK7FC received a radio license for transmitting on the frequency 14,470.1kHz. Below, its signal (transmitting a continuous wave) received in Gdansk at a distance of about 875 km on QRSS 120.

Last time I tested earth electrode I felt encouraged to work on this some more. Beneficial propagation during this time of the year and the fact that I’ve been well drilling on my land were more than a good excuse for experimenting with an electrode dug 13 meters below ground level. The electrode was placed right in the well and dipped in water of 50 cm. The other electrode was a 1,5 meters long piece of steel beam with ‘C’ crossed plunged in the nearby lake. The distance between the two electrodes was ca. 100 meters.

Inox mesh serving as an electrode wound on a 160mm pipe.

Continue reading “Testing earth electrode once again”

Successful experiment with earth dipole about 150m long encouraged me to experiment with a longer antenna about 600m long. I used industrial earthing on one side and steel beam with ‘C’ cross section immersed in the water on the shore of a small lake served as the other electrode. I used industrial earthing on one side. The antenna consisted of two wires about 150m (symmetric cable) and 600m (PKL) long,

The resistance of the antenna for DC was about 1kΩ.

Continue reading “Experyment with antenna earth elektrode about 600m long”