For important information about JT65 on Multipsk.
73
Patrick
>you know what Patrick? it works really, really well and can live with the GUI
>however you want it.
TKS John!
----- Original Message -----
From: Patrick Lindecker
To: [EMAIL PROTECTED] ; [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Sent: Sunday, March 02, 2008 9:29 PM
Subject: [multipsk] Test of JT65 on Multipsk / Essai du JT65 sur Multipsk
I forgot to precise two points:
1) as JT65 manage many frequencies, it is important and indispensable to
autocalibrate the sound card: "Sampling freq" button ("Fréq. échantil." for
French users),
2) by default, you use the hard-decision Reed-Solomon decoder. It works down
to -24 dB. If you push on the button "KVASD decoder" which is a soft-decision
Reed-Solomon decoder, you will work down to -26 dB but you will have (very
rarely) a false decoding.
Good tests!
73
Patrick
----- Original Message -----
From: Andrew O'Brien
To: [EMAIL PROTECTED]
Sent: Sunday, March 02, 2008 9:03 PM
Subject: Re: [multipsk_team] Test of JT65 on Multipsk / Essai du JT65 sur
Multipsk
It works !
On Sun, Mar 2, 2008 at 2:55 PM, Andrew O'Brien <[EMAIL PROTECTED]> wrote:
> Testing it now Patrick
>
>
>
> On Sun, Mar 2, 2008 at 2:28 PM, Patrick Lindecker <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Hello all,
> >
> > I have issued a new test version of Multipsk which adds the JT65 mode
> > (RX/TX), for the ones interested by tests.
> >
> > This mode is interesting as it can decode very weak signals down to a
> > S/N=-25 dB (according to my measures and considering a reference noise
> > bandwidth of 3000 Hz, as for the other modes of Multipsk).
> >
> > A 4.8 Multipsk test version in a ZIP test package is available in my site.
> > It contains the Multipsk test version and help files + the KVASD.EXE file.
> > http://f6cte.free.fr/MULTIPSK_TEST_02_03_2008.ZIP
> >
> > Paste this adress in your Internet Explorer or equivalent. Download the
> > file.
> > Create a tempory folder (C:\TEST, for example), unzip the file in it and
> > start C:\TEST\Multipsk.exe (the auxiliary files will be created
> > automatically).
> >
> > I propose a test in JT65A, 14074 KHz USB on the XCVR (AF about 1300 Hz)
the
> > next saturday at 11h00 UTC. I will call CQ.
> >
> > Important: the transmission of a JT65 frame must begin one second after
the
> > minute with a tolerance on +/-1 sec on the PC clock. So it will be
necessary
> > before beginning to do JT65, to set your PC clock to the right time.
> >
> > For help about JT65, click on the right button of the mouse when you are
> > over any button relative to JT65. You can also look at the hints on each
> > button.
> >
> > If you are equipped, you can also try to do EME QSO (" Earth - Moon -
Earth
> > "), in VHF and UHF.
> >
> > TKS to report bugs and transmissions done.
> >
> > 73
> >
> > Patrick
> >
> >
******************************************************************************************************************************************
> >
> > Here are some information about JT65
> >
> > Created by: Joseph Taylor (K1JT) in 2004
> >
> > Description :
> >
> > Baud rate : 2,69 (11025/4096) or 0.372 second by 6 bits symbol
> >
> > Messages : a message of 46.8 seconds duration begins at t=1 sec after the
> > beginning of the UTC minute and lasts until t=47.8 sec (it is necessary
that
> > the PC may be synchronised on a standard clock). It is composed of 126
> > symbols, each one with a lenght of 4096 audio samples (0.372 seconde). 63
> > carry a synchronization tone at 1270,5 Hz. 63 "6 bits symbols" carry the
> > message (allowing the Reed-Solomon coding of 72 bits).
> > The 72 bits consist of (non exhaustive):
> > * call 1 (28 bits) + call 2 (28 bits) + 4 characters Locator (15 bits)
plus
> > the bit 72 to inform that it is a formatted message,
> > * call 1 + call 2 (+ prefix or ending, example: F6CTE/P or ON/F6CTE) plus
> > the bit 72 to inform that it is a formatted message,
> > * call 1 (+ prefix or suffix, example: F6CTE/P or ON/F6CTE) + call 2 plus
> > the bit 72 to inform that it is a formatted message,
> > * CQ + call + 4 characters Locator plus the bit 72 to inform that it is a
> > formatted message,
> > * plain text: 13 characters
> >
> > Speed : 72 bits (or 13 characters maximum in plain text) by 60 sec period
> > (with only one message by period) or 2,2 wpm
> >
> > ...................................................
>
>
>
> --
> Andy K3UK
> www.obriensweb.com
> (QSL via N2RJ)
>
--
Andy K3UK
www.obriensweb.com
(QSL via N2RJ)
