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

To: [email protected]
Subject: Re: LF: JT9: A New Digital Mode for MF and LF
From: Stefan Schäfer <[email protected]>
Date: Sat, 27 Oct 2012 22:57:01 +0200
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LF, Roger,

Am 27.10.2012 22:26, schrieb Roger Lapthorn:
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.
Agreed!


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.
Yes, the spreading effect is already notable. Thus i transmit good old QRSS-60 tonite!

The new mode is certainly a very promising for LF DX for weaker stations. Like we demonstrated with DF6NM's WSPR-32 version, JT9-30 should do about the same but is less complex to use.


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.
Joe told that setting up a online map like in WSPR may be done in the future but it takes some time.
He also wants to release an update that allows to set the sound output center frequency to near 24 kHz.

Now it's time for the "i did the first QSO..."-hunters :-)

73, Stefan/DK7FC



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

73s
Roger G3XBM


On 27 October 2012 21:00, Stefan Schäfer <[email protected]> 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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