Message-ID: <50D0C37A.2030405@gmx.net>
Date: Tue, 18 Dec 2012 20:26:50 +0100
From: Tobias DG3LV <DG3LV@gmx.net>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Thunderbird/17.0
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
CC: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
References: <BLU153-W64F019AC7C3960B38DD2CBCF330@phx.gbl>,<50CE5A96.40902@broadpark.no> <50CE6BDB.6080008@gmx.net>,<50CF71CE.5090902@broadpark.no> <BLU153-W6470A7BDD01AE0F906A08DCF320@phx.gbl>,<50CFA0F5.1030506@princeton.edu> <7E7DFBB4D102A04DB5ADC88D66628A4A0FB60AA5@ICTS-S-MBX5.luna.kuleuven.be>,<50D0567E.5030305@gmx.net> <7E7DFBB4D102A04DB5ADC88D66628A4A0FB60B7B@ICTS-S-MBX5.luna.kuleuven.be>
In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A0FB60B7B@ICTS-S-MBX5.luna.kuleuven.be>
Subject: LF: JT9-10 @ 501.4 +1000
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 8bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Hi Rik !

OK, QRV on 501.4 in JT9-10 from now on (19:15). My reply-signal will be 
on 475.268 kHz = 474.2 (WSPR-)Dial + 1068 Hz Offset.

PA-test was successful + Tx-frequency should be stable enough, so we can 
have some fun !

73 de dg3lv Tobias

Am 18.12.2012 14:57, schrieb Rik Strobbe:
> Hello Tobias,
>
> sorry, I didn't think of the lower offset (1000Hz) with JT9-10.
> But I will stick to 501.4kHz TX frequency = 500.4kHz dial for 1000Hz audio.
> 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 the 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 1000–2000 Hz for
> sub-modes JT9-1 and JT9-2, 1000–1300 Hz for JT9-5, 1000–1150 Hz for
> JT9-10, and 1000–1050 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 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 setup 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
>>
>