First succesful transmission on 8270Hz between Canada and Poland

Joe VO1NA transmitted on  21 december 2017 at 8270.0075Hz.His transmission was succesfuly received in Warsaw (RX Jacek/SQ5BPF), at a distance of about 5100km. This is the first succesful reception of a signal from Canada in Poland at 8270Hz.

Joe transmitted ebnaut with the following parameters: 1 character, 16K21A coding, 8 bit CRC, 60s per symbol, start at 21:00 UTC.

The transmission was first received decoded by Paul Nicholson from remote VLF streams, avaliable at his site:

I’ve later decoded it myself with a bit better signal. The stream made avaliable to Paul’s site it vorbis compressed, which is lossy compression and looses some information. This is the reason  why my local recording is a bit better. The decoded signal (the message was “S”):

found rank 0 ber 4.3382e-01 Eb/N0 1.3 M -3.196489811e-01 [S] ps [ 3 -150 -150 -150 -150]
carrier phase: -0.9 deg
carrier Eb/N0: 2.0 dB
carrier Es/N0: -17.78 dB
carrier S/N: 9.57 dB in 30.6 uHz, -35.57 dB in 1Hz, -69.55 dB in 2.5kHz
elapsed 50

The signal was decoded by Paul from other streams made avaliable to his site (orginal email: ):

Date: Fri, 22 Dec 2017 09:43:00 +0000
From: Paul Nicholson 
Reply-To: [email protected]
To: [email protected]
Subject: Re: LF: VLF NA Ebnaut

VO1NA wrote:

> 2100 utc tonight [21st], 16K21A, CRC-8, one character,
> 544 symbols, 1 minute each, 8270.0075 Hz.

Todmorden (3575 km)

Decoded easily. Eb/N0 +11.1 dB, S/N -26.52 dB in 1Hz,
-60.50 dB in 2.5kHz, rank 0, BER 32%, constant reference phase.

Good quality signal, stable and strong - over 10dB to spare at
the decoder.

Bielefeld (4301.5 km DL4YHF)

Decoded easily. Eb/N0 +4.7 dB, S/N -32.91 dB in 1Hz,
-66.89 dB in 2.5kHz, rank 0, BER 41%, constant reference phase.

First Canada to Germany VLF decode, I think.

Perhaps Stefan also decodes? Distance is slightly greater
at 4419.8 km.

Wolf's receiver has been working very well the last few days.
Wonder if some improvement has been made?

Warsaw (5096.6 km SQ5BPF)


Decoded easily. Eb/N0 +1.0 dB, S/N -36.58 dB in 1Hz,
-70.56 dB in 2.5kHz, rank 5, BER 44%, constant reference phase.

First Canada to Poland VLF decode.


Unfortunately off line, timing problems, system being re-installed.


What a great result!

Will send the decode off-list to confirm, but it is most unlikely to
be false given the strong signal and the same decode at three

Paul Nicholson