From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "DG3LV@gmx.net" <DG3LV@gmx.net>
CC: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>,
	"rsgb_lf_group@yahoogroups.co.uk" <rsgb_lf_group@yahoogroups.co.uk>
Thread-Topic: LF: JT9-10 @ 474 +1400
Thread-Index: AQHN3KRaY4Ch8f+Jh0yOc8DkOGbLK5gdhuGAgACrjHSAACzcAIAAKryJ
Date: Tue, 18 Dec 2012 13:57:46 +0000
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Subject: RE: LF: JT9-10 @ 474 +1400
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Hello Tobias,

sorry, I didn't think of the lower offset (1000Hz) with JT9-10.
But I will stick to 501.4kHz TX frequency =3D 500.4kHz dial for 1000Hz audi=
o.
I will start at 20:00UTC and initially go for 3 rounds (so 20:00-20:10 , 20=
:20-20:30 and 20:40-20:50).
It will be just for test purposes:
1. check if my setup is stable enough for JT9-10.
2. if there is significant TX (or RX) drift to provide some audio files for=
 Joe (K1JT)
So those who will monitor my signal are encouraged to save audio files of t=
he transmissions and eventually send them to Joe.

73, Rik  ON7YD - OR7T

________________________________________
Van: Tobias DG3LV [DG3LV@gmx.net]
Verzonden: dinsdag 18 december 2012 12:41
To: Rik Strobbe
Onderwerp: Re: LF: JT9-10 @ 474 +1400

Hi Rik !

My station will be running. Please specify "tonight" more precisely. I
will try to sync on your signal and transmit/reply on the 475 kHz band.
Conditions seem to be very good these days as i was heard by OH5YW and
EI0CF during daylight already (on WSPR) !

Please consider using a lower offset than 1400 Hertz on JT9-10, as Joe
has written :

 From Joe K1JT "WSJT-X_Users_Guide.pdf" :

"3. The waterfall frequency range always starts at 1000 Hz. This means
that your on-the-air frequency range starts exactly 1 kHz above your
dial frequency. The upper frequency limit depends on JT9 sub-mode, the
setting of FFT bins/pixel, and the width of the waterfall graph. In
normal use the recommended audio frequency range is 1000=962000 Hz for
sub-modes JT9-1 and JT9-2, 1000=961300 Hz for JT9-5, 1000=961150 Hz for
JT9-10, and 1000=961050 Hz for JT9-30."

I do not have much experience with with JT9-10 yet, so I cannot tell
whether the above text is a recommendation or a must.

The "wide graph" window is automatically zoomed when using JT9-10, so
the absolute maximum Offset would be 1240 Hertz at 1 FFT bins/pixel.

See you tonite !

73 de dg3lv Tobias


Am 18.12.2012 09:10, schrieb Rik Strobbe:
> Hello Joe, all,
>
> if there are some "takers" I could do some JT9-10 transmission tonight on=
 501.4kHz (500kHz dial) starting 20 UTC.
>
> The setup here is a Kenwood TS440 transmitting on 3.5MHz mixed with 3MHz =
xtal osc. down to 500kHz, filtered and amplified to 6W RF (estimated 20mW E=
RP).
> With this setup I was copied up to 1600km (OH) in JT9-1 and JT9-2.
>
> It would be interesting to know if the frequency stability such a basic s=
etup is OK for JT9-10.
>
> 73, Rik  ON7YD - OR7T
>
> ________________________________________
> Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.o=
rg] namens Joe Taylor [joe@Princeton.EDU]
> Verzonden: maandag 17 december 2012 23:47
> To: rsgb_lf_group@blacksheep.org
> Onderwerp: Re: LF: JT9-10 @ 474 +1400
>
> Hi Laurence, Steinar, and all,
>
> On 12/17/2012 5:15 PM, Laurence KL1 X wrote:
>> Steinar I was getting some reasonable syncs but appeared not
>> stable enough - so that confirms it :-) Laurence KL 1 X
>
> LA5VNA wrote:
>>> Thanks Tobias. The conclusion is clear , my system in NOT stable enough
>>> when using JT9-10. Pity , but that's life ;(
>
> Please send me an example of a JT9-10 file that seems like it should
> have decoded, but did not.  NOBODY has yet done so.  I am reasonably
> sure that small amounts of frequency drift can be detected and
> adequately compensated in software... but I can't do it without some
> typical examples.
>
> If you know it, it will help to have, along with the file, the message
> that was being transmitted.
>
> Note to all: I am presently working on a version or WSPR that will allow
> transmissions of length 10 (or 15?) and 30 minutes, with other features
> like the traditional WSPR.  Sensitivity should be as good as the WSPR-8
> and WSPR-32 tests made by Marcus (and others).
>
>          -- 73, Joe, K!JT
>=