Re: DK7FC back on LF:

[DK7FC <selberdenken@posteo.de>]

Hello Markus, LF,

Thanks for watching and the note. Join in! It is the time now! Let's see how many we can become!
There is a surprising + impressing high activity, better than a few years ago when i went to MF/VLF. Reports by 24 stations in the last 12 hours, far from what i have expected. Not so many Russian stations any more it seems. But late in the night i saw RUSWL and switched to WSPR-15, reached him a few times then. Maybe the beginning of a come back of a few more...
Oh, now i see there is G3XIZ as well. Looks like a spontaneous party!!!

I'm running 150V*0.8A DC input to my H bridge PA and a small lossy coil wound with 0.75mm^2 loudspeaker cable, giving about 3 A antenna current.
I'll build a phase shifter with a XOR gate into the exciter line, so we can also try some EbNaut. Maybe you can decode my signal over that distance.

73, Stefan


Am 17.06.2017 10:50, schrieb Markus Vester:

Long time no see... Stefan is back on LF! The WSPR transmissions are currently producing nice sky-blue traces on my grabber .

Best 73,
Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 15. Jun 2017 18:33
Betreff: LF: JT9 on LF

Hello Chris,

I see you are strong again on LF. I started my JT9 RX here on LF. However the QRN rised extremely since the afternoon.

The latest versions only support JT9-1. This was successfully used by several stations on MF some months ago. For LF, a frequency below 137.45 should be used, to avoid collisions with OP32, WSPR and EbNaut transmitters. So just try 137.4 kHz. I'm watching there for you now. If your U3S does not support JT9-1, maybe there are firmware updates?

Listening stations and contacts are also listed at https://www.pskreporter.info/pskmap.html, select the JT9 mode at 2200m to filter the list...

73, Stefan


Am 14.06.2017 18:01, schrieb Chris Wilson:

Hello DK7FC,

I have never tried JT9, but it appears my U3S exciter covers that
mode. What time span (there's JT9-2 upwards it seems), and what
frequency is appropriate? I am happy to give it a shot!