ARLA/CLUSTER: O IMPRESSIONANTE modo JT9 consegue descodificar sinais a -40dB.

[Carlos Fonseca]

Ja testei e funciona.
Se nao foi este modo, foi da mesma familia.

73's de Carlos, CT1GFQ
SKCC#466
REP#1406
No dia 22 de Nov de 2012 09:04, "Renato Encarnação" <ct7abr  gmail.com>
escreveu:

> Boas João
>
> Esse novo modo descodifica sinais de -40dB em relação a que?
>
> -40dBm certamente não será, pois isso é um sinalão.
>
> Não estarão a referir-se à relação sinal-ruido??
>
> Adiante lá.
>
> 73, Renato
>
> 2012/11/21 João Costa > CT1FBF <ct1fbf  gmail.com>
>
>> New Mode for MF and LF
>>
>> If you are on 160 meters, or perhaps on 472 or 137 kHz, you may be
>> interested in a new mode called JT9, designed especially for making
>> QSOs on these bands. JT9 uses the structured messages introduced in
>> 2003 for the JT65 mode, now widely used for EME and for QRP operations
>> at HF.
>>
>> JT9 can operate at signal levels as low as -27 dB (in a 2500 Hz
>> reference bandwidth), with one-minute timed transmissions. It also
>> offers slower transmissions of 2, 5, 10 and 30 minutes duration, and
>> the slowest mode can decode signals as weak as -40 dB. With one-minute
>> transmissions, submode JT9-1 has a total bandwidth of 15.6 Hz -- less
>> than one-tenth the bandwidth of a JT65A signal. The other submodes are
>> narrower still: a JT9-30 signal occupies about 0.4 Hz total bandwidth.
>>
>> JT9 is implemented in an experimental version of WSJT called WSJT-X.
>> Some further details can be found at
>>
>> http://www.physics.princeton.edu/pulsar/K1JT/WSJT-X_Quick_Start_Guide.pdf,
>>  and an early version of WSJT-X can be downloaded from
>>  http://physics.princeton.edu/pulsar/K1JT/WSJTX_01r2695.exe .
>>
>> If you want to try JT9, I suggest using dial frequency 1838, which is
>> also used for JT65A, PSK31, and MFSK. In default configuration WSJT-X
>> allows transmission and reception 1 to 2 kHz above the dial frequency.
>>
>> Please note: WSJT-X is in an early development stage. Your feedback
>> (direct email to me is best) will be much appreciated. And feel free
>> to email me for a sked!
>>
>> -- 73, Joe, K1JT
>>
>>
>> _______________________________________________
>> CLUSTER mailing list
>> CLUSTER  radio-amador.net
>> http://radio-amador.net/cgi-bin/mailman/listinfo/cluster
>>
>>
>
> _______________________________________________
> CLUSTER mailing list
> CLUSTER  radio-amador.net
> http://radio-amador.net/cgi-bin/mailman/listinfo/cluster
>
>
-------------- próxima parte ----------
Um anexo em HTML foi limpo...
URL: http://radio-amador.net/pipermail/cluster/attachments/20121122/eb820431/attachment.html