Re : LF: JT9: A New Digital Mode for MF and LF

[f4dtl@aol.com]

OK Markus good decodes here.

 

F4DTL Nicolas

-----E-mail d'origine-----
De : Markus Vester <markusvester@aol.com>
A: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Envoyé le : Di, 28 Oct 2012 0:01
Sujet : Re: LF: JT9: A New Digital Mode for MF and LF

Currently testing JT9-2 on 137420, transmitting during even 2-minute slots.

 

73, Markus (DF6NM)

From: Roger Lapthorn

Sent: Saturday, October 27, 2012 10:26 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: JT9: A New Digital Mode for MF and LF

This is exciting news being a 2-way mode, especially as it is 9-FSK, so doesn't need a linear PA. With bandwidths as small as 0.4Hz for the long version, no-one will be complaining about how much bandwidth all this digital stuff takes. Unlike OPERA, the software will be well documented and open source.

There is a danger that, with too many digital modes now available, the activity may be spread too thinly, a point Mal raised some time back I believe Somehow though I suspect JT9 will rapidly become the de-facto digital mode on 472kHz and 136kHz.

I hope that one of the internet databases - PSK Reporter I guess, or perhaps an equivalent to WSPRnet - will be able to display JT9 activity as this was one of the great bonuses with WSPR beaconing.

I may give it a go on 500kHz next week.

73s
Roger G3XBM

On 27 October 2012 21:00, Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de> wrote:

Oh, now Joe has lifted the secret ;-)
He released the mode 2 days ago and a first update yesterday.

Now it really gets complex which mode to choose. WSPR, Opera, JT9...
But as a digital mode for LF i gues JT9-30 is the most promising at all.

73, Stefan/DK7FC

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