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
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