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Date: Fri, 31 Aug 2012 01:47:55 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Opera frequency usage
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Am 30.08.2012 17:09, schrieb Markus Vester:
> [...]
> - DK7FC was active on a nearby frequency during most of the night. In 
> conjunction with the noise blanker the RX is desensitized by the a 
> nearby strong signal. The problem is exacerbated by high density of 
> keyclicks in Opera (5 to 8x more than QRSS), and that most seem to 
> apply hard keying. Trying to interleave operating times (eg. even vs 
> odd days, or hours) is probably not a satisfactory solution.
Sorry for that Markus. You know, the AM modulator is very near to the 
top of my Todo list and the first half of the circuit is working now 
(BTW not using a PWM with a TL494 but a VCO using a CD4046. That works 
well). So it sould be possible for me to reduce key click of signals 
generated in SpecLab, i.e. QRSS/DFCW/HELL/Beacon-Cw, soon. If my clicks 
would be reduced, would then the NB performance come back to 100%?

However Opera directly keys the PA using the COM port and an external 
signal generator (SL!). This is one of the main advantages of that 
software and why Graham calls it CW replacement mode (of course CW 
cannot be replaced, it is a language for its own).

Recently we discussed about transmitting the OP code by playing an image 
in slow hell. Or alternatively a file which can be loaded ito the 
arbitrary waveform generator of SLs signal generator could play the code 
in SL. Of course the software could be run simultaneously. Maybe even 
the Opera TX-button can be virtually pressed by a DOS command so the 
announcement of that transmission is is sent to the web? The mode and 
band information must be sent too, to coordinate the software with the 
actual TX then. That makes it more and more complex.
So what might be the solution for those who use an external signal 
source and just key the PTT by the COM port using Opera software? Maybe 
a special higher order shaping using hardware, like in a CW HF TRX? 
Possible!

73, Stefan/DK7FC