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Warsaw Pact 4m antenna equivalent

Sometimes an “4m antenna equivalent” can be bought on various auction sites (the labels are in one of the Warsaw-Pact members’ languages, often russian):

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Experyment with antenna earth elektrode about 600m long

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.

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Decoding a 7-character ebnaut message on 6470Hz

On 3 June 2017 Stefan DK7FC did an 7 hour ebnaut transmission on 6470Hz with 7 characters. Previously i’ve been able to receive 2-3 character massages sent in a similar amount of time, however 7 characters seemed to be unreceivable. This article shows how the message was decoded, and may be useful to people starting to use linux and/or vlfrx-tools.
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Earth Electrode Antenna Tests

I conducted my first tests with earth electrode antenna in the nineties with the use of hot water installation. While drilling a well on my piece of land in the countryside I thought this could be just the right moment to explore this idea a bit more. A test drill for 5 meters provided a hole where I put an electrode. However, the soil in the hole was utterly dry and the electrode was not covered with it – it was just a two meters long aluminium L-beam. High resistance of this connection apparently influenced the antenna’s efficiency. A steel beam with ‘L’ cross section immersed in the water on the shore of a small lake served as the other electrode. The distance between the two electrodes was ca. 150 meters.

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ZEVS on 82Hz or strange carriers on ELF

The Russian ZEVS station is probably transmitting on 82Hz. More information about the station here:

http://www.vlf.it/zevs/zevs.htm

https://en.wikipedia.org/wiki/ZEVS_%28transmitter%29 Continue reading “ZEVS on 82Hz or strange carriers on ELF”

List of milestones on VLF/LF/MF

Paul Nicholson has published a list of VLF (and some LF/MF) milestones:

http://abelian.org/vlf/amateur-radio/

It’s interesting to see the pace of advancements in this field. In 2010 receiving a carrier (with lots of power and a huge antenna) 900km away was a big achievement. In 2017 sending a short message using a much smaller antenna is normal.

Next tests in the 6470Hz band

In 22 and 23 april 2017 Stefan DK7FC did additional test ebnaut transmissions on 6470Hz. Similar to the previous tests, the transmission was decoded as usual by Paul Nicholson (850km) and also by Jacek SQ5BPF (900km). Continue reading “Next tests in the 6470Hz band”