Nieuwe digimode JT10 in JTDX versie 17.8

Alles over de diverse digitale modi.
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PA1GVZ
Berichten: 352
Lid geworden op: 25 nov 2012, 19:33
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Nieuwe digimode JT10 in JTDX versie 17.8

#1 Bericht door PA1GVZ »

http://www.qrz.lt/ly3bg/JTDX/jtdx.html

Hier is deze versie te downloaden. JT10 is inmiddels ook al bekend op o.a. hamspots.net en pskreporter.

http://hamspots.net/jt10/
https://www.pskreporter.info/pskmap.html

Er worden momenteel dagelijks al QSO's gemaakt met deze mode.
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19DT2120
Berichten: 908
Lid geworden op: 30 dec 2006, 12:22
Locatie: Eibertjesdarp

Re: Nieuwe digimode JT10 in JTDX versie 17.8

#2 Bericht door 19DT2120 »

Wat is het verschil tussen jt9 en jt10?
Soms weet ik het ook niet meer.........

PA1GVZ
Berichten: 352
Lid geworden op: 25 nov 2012, 19:33
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Re: Nieuwe digimode JT10 in JTDX versie 17.8

#3 Bericht door PA1GVZ »

19DT2120 schreef:Wat is het verschil tussen jt9 en jt10?
Zie onderstaande mail van UA3DJY:

Hi All,

JT10 mode is derived from the JT9 mode and has 10 tones where two of them dedicated to synchronization pattern, rest 8 are the message data.
Each tone being transmitted for 6912/12000= 0.576 second, minimal distance between the two neighbouring tones is 4*12000/6912= 6.94(4) Hz.
Frequency bin width is 12000/6912= 1.736(1) Hz, so there is always a gap between the two neighbouring tones.
Whole spectrum occupies 6.94(4)*9 +1.74= around 65 Hz. Fano decoder is used for JT10 mode.
16 tones (8+8) are used for SYNC pattern, 69 tones allocated to the message data, total 85 tones being transmitted per 85*0.576= 48.96 seconds time interval.

There are several ideas behind this approach:

- usage of two tones for SYNC pattern can simplify to distinguish harmonic based signals (JT10b and JT10c), also these QRM-ing signals can be decoded and subtracted from the whole signal in the future SW versions

- wider tone spacing shall bring better resistance to the Doppler frequency spreading in comparison to JT65a mode

- wider tone spacing shall bring better spectra overlapping capacity in comparison to JT65a mode, and more signal density on the band if signal subtraction is used in the software

- relatively narrow bandwidth of JT10 signal will allow to get better band capacity in comparison to the JT65a mode.

So far it is not clear if JT10 will go to the public use, one of the reasons that can stop it's usage is the relatively small SYNC pattern, and there is a long way ahead to make it more attractive one in comparison to the
JT65a mode.

73 Igor UA3DJY

PA1GVZ
Berichten: 352
Lid geworden op: 25 nov 2012, 19:33
Roepletters: PA1GVZ

Re: Nieuwe digimode JT10 in JTDX versie 17.8

#4 Bericht door PA1GVZ »

Of nog meer info in onderstaande Yahoo conversatie:

https://groups.yahoo.com/neo/groups/JTD ... s/messages

Je moet je hiervoor wel eerst registeren bij Yahoo en aanmelden bij de JTDX groep.

73 Gert

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