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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: g3zjo <[email protected]>
Date: Sun, 28 Oct 2012 09:13:29 +0000
In-reply-to: <0FFE41FC2958470DA1182F727C7B6064@White>
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Joe's updated .exe has cured the PTT problem.

Direct X levels are correct although MME does use the sliders.

I haven't tried as non Admin yet.

Eddie G3ZJO
 
On 28/10/2012 00:20, Markus Vester wrote:
Hi Eddie,
 
1) no com ports used here just plain VOX.
 
2) I found that selecting the MME or WDM-KS sound drivers in setup appears to bypass the "wave" slider in the audio mixer, producing high levels. Ticked the Direct-X driver instead.  
 
3) Didn't stumble here as I'm running XP with admin rights.
 
Best of luck,
Markus

From: g3zjo
Sent: Sunday, October 28, 2012 1:02 AM
Subject: Re: LF: JT9: A New Digital Mode for MF and LF

Not so here I am afraid, I was hoping to run on 500kHz.

1) On 2 very different computers the TX switching of the COM Port Latches the TX on permanently, TX STOP puts it back into RX mode but only closing the software unlatches the COM port.

2) Audio out levels are very high, higher than any other Ham software, I will need an audio attenuator between line out and rig.

3) Program runs under an Admin Account but as a User it crashes after different lengths of time on each computer.

Any one else having problems.? Computer O/S is XP.

Eddie G3ZJO

On 27/10/2012 22:59, Markus Vester wrote:
Currently testing JT9-2 on 137420, transmitting during even 2-minute slots.
 
73, Markus (DF6NM)

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