Re: LF: JT9-1 and 2, echoes, waterfall

[Joe Taylor <joe@Princeton.EDU>]

On 10/30/2012 2:41 PM, Stefan Schäfer wrote:
> Like yesterday i'm running my receiver down in the office on the Win7
> PC. However there are no decodes so far after 4 rounds. In the next
> round i want to shorten the antenna wire so the signal is some 20 dB
> lower. Maybe it has actually something to do with to strong signal levels.
Possibly.  The decoder is for weak signals, remember.

> Am 30.10.2012 18:23, schrieb g3zjo:
> > [...]
> >
> > Non de-code checks done here today on JT9-2, it looks to me that your
> > TX / RX need to be stable over the 2min period to less than +- 0.78Hz,
> > pretty critical for rigs.
> Maybe this is an issue, yes. The stability of my signal is that of the
> soundcard, which should be much better than 0.78 Hz in 30 minutes.
> However the receivers end must be taken in account as well, of course.
> If people are using a HF TRX, the overall drift may become critical.
> Maybe Joe can comment on that.
>
> I'm going to transmit a last JT9-30 round for today, starting 19...19:30
> UTC, 137.44 kHz.
I suggest that you use JT9-1 or JT9-2 until you have sorted out your 
various problems.
        -- Joe