Re: LF: JT9-10 on 137.42 kHz

["Markus Vester" <markusvester@aol.com>]

Thanks very much for the spot Haldór, glad my little 0.5W ERP are making it your way!

 

My clock should be spot on now, and I'm reading Stefan's last one:

2130 10 12 -1.3 1919.89 0.00 DK7FC JN49IK

... hmmm, still -1.3 s offset. Would that mean that the transmission was ahead of the receiver, or vice versa? 

 

Best 73,

Markus (DF6NM)

From: Halldór

Sent: Thursday, November 22, 2012 10:37 PM

To: rsgb_lf_group@blacksheep.org

Subject: RE: LF: JT9-10 on 137.42 kHz

Just got this decode.

 

2120   4  -37   0.9 1026.60  0.00   DK7FC DF6NM K

 

But no decode so far from Stefan.

 

Halldór

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester
Sent: 22. nóvember 2012 21:18
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: JT9-10 on 137.42 kHz

 

... sorry Stefan, I think there was a clock error on my side, which might also have caused the missing decodes. Have restarted the NTP software again. I'm using wsjtx v0.4 r2746 here which runs nice and smooth.

 

73, Markus

 

From: Stefan Schäfer

Sent: Thursday, November 22, 2012 10:03 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: JT9-10 on 137.42 kHz

 

Thanks Markus,

What do you think about the -2.2 time delay? I don't know where it may come from. The program is driving the transmit converter directly, you know.

I was running a very old version of WSJT-9 and updated to the latest one a few minutes ago. However i think that should make no difference on the transmitter side.

Is there any noticable difference now?

73, Stefan


Am 22.11.2012 21:45, schrieb Markus Vester:

Hi Stefan,

 

got the first decode 10 minutes after starting the WSJT-X monitor:

 

2010 10 14 -2.2 1919.89 0.00 DK7FC JN49IK

 

but for some reason nil from your latest over at 20:30. Your signal strength now appears to be at its usual level.

 

BTW I don't think it was Joe's intention that we should use below 1.1 kHz audio. I guess he just didn't yet get around to implement an option to shift the waterfall display range,  with us keeping him so busy on the decoder...

 

Best wishes,

Markus (DF6NM)

 

From: Stefan Schäfer

Sent: Thursday, November 22, 2012 4:07 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: JT9-10 on 137.42 kHz

 

Oh, i just remember and see that JT9-10 is intended to run on 1000...1100 Hz audio frequencies. However the bandplan says that digimodes are at 137.4...137.6 kHz.
So one has to change to 5 FFT bins/pixel to reach 1420 Hz anyway or simply choose 136.4 kHz "dial" and set the center frequency to 1020 Hz.

73, Stefan/DK7FC