Re: LF: Re: SlowJT9 v0.9.02: Decode simultaneous

[N1BUG <paul@n1bug.com>]

Hello Rik, all,

Hmm. That seems significant.

Selfishly, if using the original specification makes SlowJT9
decoding compatible with transmissions from devices such as the U3S
I would prefer that. But you should not listen to me. Follow the
advice of others. :-)

73,
Paul N1BUG


On 11/13/18 8:38 AM, Rik Strobbe wrote:
> Hello Paul, all,
> 
> the original slow JT9 submodes make better advantage of the cycle
> length than the ones currently used in SlowJT9. Eg.: where the
> current JT9-5 version has a transmission duration of 245 s, the
> original JT9-5 had a transmission duration of 292 s (both for a
> 300 s = 5 min cycle). And longer transmission duration = longer
> symbol length = better SNR. The theoretical advantage of the
> original submodes over the currenty used ones is 0.46 dB for
> JT9-2 and 0.74 dB for JT9-5.
> 
> 73, Rik  ON7YD - OR7T