From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: JT9-10 @ 474 +1400
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Date: Tue, 18 Dec 2012 08:10:36 +0000
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Subject: RE: LF: JT9-10 @ 474 +1400
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Hello Joe, all,

if there are some "takers" I could do some JT9-10 transmission tonight on 5=
01.4kHz (500kHz dial) starting 20 UTC.

The setup here is a Kenwood TS440 transmitting on 3.5MHz mixed with 3MHz xt=
al osc. down to 500kHz, filtered and amplified to 6W RF (estimated 20mW ERP=
).
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 set=
up is OK for JT9-10.

73, Rik  ON7YD - OR7T

________________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org=
] 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=