I made a 8270Hz grabber with a GPS reference. QTH at SQ5BPF Warsaw/Poland KO02md.
92.6uHz bins, 1 hour steps.
Direct link:
Author: sq5bpf
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):
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.
Continue reading “Decoding a 7-character ebnaut message on 6470Hz”
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”
6470Hz transmission by DK7FC succesfuly received at SQ5BPF (900km distance)
Stefan DK7FC has been recently transmitting on 6470Hz (46km wavelength) from a stationary antenna between two buildings.
The Ebnaut transmissions were received by Paul Nicholson (England) and Jacek SQ5BPF (Poland) at a distance of 900km (IN49IK to KO02MD).
Continue reading “6470Hz transmission by DK7FC succesfuly received at SQ5BPF (900km distance)”
USA hams get the 137kHz and 472kHz bands
USA hams just got the 137kHz and 472kHz bands.
https://apps.fcc.gov/edocs_public/attachmatch/FCC-17-33A1.docx
Spring has started, which is bad for LF/MF, but we hope that the first Poland – USA contact will be in 2017.
Succesful transmission on 2970Hz
On 10 march 2017 Stefan DK7FC experimented with transmitting on 2970Hz. The signal was received in Todmorden, England by Paul Nicholson at a distance of about 850km!
A very simple receiver for 136kHz
This project is a very simple receiver for the 136kHz band, with an 12kHz IF. The IF can be fed into a sound card and further processed in software (for example in Spectrum Lab) to get a waterfall spectrum plot, receive CW by ear etc.
Please read the article A very simple receiver for 136kHz