Hello Tobias, all,
I have a faint carrier on 501.4, not sure if it is local or not so I will TX a
bit up on 501.41kHz.
My JT9-10 TX sequences will be 20:00-20:10 , 20:20-20:30 and 20:40-20:50.
Inbeween I will RX on your freq.
73, Rik ON7YD - OR7T
________________________________________
Van: Tobias DG3LV [[email protected]]
Verzonden: dinsdag 18 december 2012 20:26
To: [email protected]
Cc: Rik Strobbe
Onderwerp: LF: JT9-10 @ 501.4 +1000
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 [[email protected]]
> 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: [email protected] [[email protected]]
>> namens Joe Taylor [[email protected]]
>> Verzonden: maandag 17 december 2012 23:47
>> To: [email protected]
>> 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
>>
>
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