Message-ID: <C961CE6B16AB46D1891A5A3361C5A3B0@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <k6h8pu+h1dq@eGroups.com> <508C2AC9.3010109@broadpark.no>
In-Reply-To: <508C2AC9.3010109@broadpark.no>
Date: Sat, 27 Oct 2012 20:01:38 +0100
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Subject: Re: LF: JT9: A New Digital Mode for MF and LF
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I'm always  interested in new things

But  ''uses the structured messages introduced in 2003''  ...  something 
that's  been  in-service  for  over  9 years , is this  progress or 
placation ?

G..

--------------------------------------------------
From: "Steinar Aanesland" <saanes@broadpark.no>
Sent: Saturday, October 27, 2012 7:41 PM
To: <rsgb_lf_group@blacksheep.org>
Cc: "Joe" <joe@Princeton.EDU>
Subject: LF: JT9: A New Digital Mode for MF and LF

>
> Hi all
>
> Not everyone has switched to yahoo, therefor I am forwarding a new and
> interesting email from Joe, K1JT.
>
> LA5VNA Steinar
>
>
>
>
> Den 27.10.2012 20:22, skrev Joe:
>> I invite you to try a new digital mode called JT9, designed especially 
>> for making amateur QSOs at MF and LF. 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 just 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.
>>
>> Note that these JT9 sensitivity levels are comparable to or better than 
>> those of WSPR, which uses simpler messages and is not intended for making 
>> 2-way QSOs.  JT9 has much higher throughput and reliability than QRSS CW, 
>> including DFCW modes.
>>
>> 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 .
>>
>> Please note: WSJT-X is in an early development stage. A number of 
>> improvements and enhancements are already in the works, and others will 
>> surely be added.  Your feedback will be much appreciated!
>>
>> -- 73, Joe, K1JT
>>
>>
>>
>>
>> ------------------------------------
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>
>
> -- 
> LA5VNA Steinar
> loc:jo59jq
> www.opera.no
>
>
>