LF: RE: QRSS-240 at 5170 Hz

[<hvanesce@comcast.net>]

Congrats Stefan and DL0AO team,

Very nice results, well done.

73, Jim AA5BW

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org <owner-rsgb_lf_group@blacksheep.org> 
On Behalf Of DK7FC
Sent: Sunday, August 4, 2019 7:32 AM
To: rsgb_lf_group@blacksheep.org
Subject: VLF: QRSS-240 at 5170 Hz

Here are results from the post-processing of yesterdays transmission at
5.17 kHz. RX sites at DK7FC (tree) in 57.6 km distance and DL0AO in 283 km 
distance. Mixing the two orthogonal loops at DL0AO allowed to steer the 
resulting software rotatable loop into and angle where the SNR became as good 
as it can be for that day and time. Now the message is completely readable in 
283 km distance (4.8 wavelengths). Two versions of the result at DL0AO are 
shown, one from DK7FC.

TX site: 1130m spaced ground electrodes in JN39WI | 1.7 A antenna current at 
370 W TX power (higher losses due to dry soil, thus less power from the given 
antenna voltage at the PA)

73, Stefan

Am 03.08.2019 18:08, schrieb DK7FC:
> BTW today i transmitted "73" in QRSS-240 at 5.17 kHz, starting 08:30 
> UTC. There was a team from a TV channel (Bayerischer Rundfunk) at the 
> VLF RX site of DL0AO and they followed the QRSS coming in on the 
> spectrogram. I hope they will report about it then...
> Unfortunately it took 1.5 hours to fix two broken wires of the 
> antenna. Afterwards the QRN already set in, so half the message was 
> lost in the noise... Anyway, the 7 is quite doubtless.
>
> 73, Stefan