Message-ID: <41E919A4.6030805@freenet.de>
Date: Sat, 15 Jan 2005 14:24:52 +0100
From: Wolf DL4YHF <dl4yhf@freenet.de>
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To: rsgb_lf_group@blacksheep.org
References: <E1CpPKZ-0001YH-2V@www9.emo.freenet-rz.de> <006901c4fa2c$fc275e40$0702a8c0@parissn2> <41E847FE.8030107@usa.net>
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Subject: Re: LF: Jason V0.99 with I/Q outputs
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Hi Alberto,

Thanks for the new version ! The amplitude- and phase adjustment 
controls work fine, especially because they have an immediate effect on 
the output while transmitting. A maximum phase error of 0.1° should be 
good enough for 60 dB suppression of unwanted carrier + sideband, so 
0.01° resolution for the control is accurate enough (thinking about the 
sideband suppression of "commercial" rigs, which are not better).

I found for my prototype phasing exciter, the optimum was exactly the 
default position (both controls in the center). Only one very little 
suggestion with minimum prioritiy: Show the slider positions as numeric 
values (for example, as a positive or negative percentage). This makes 
it simpler to return to the previous settings just in case something 
went wrong while tweaking, and one could use the same values in other 
programs too.

Closely related subject: When building my phasing exciter, I found the 
"balance" control of my audigy 2 soundcard has a much finer resolution 
than displayed on the slider control of the "sndvol32" control panel. 
But the finest increment steps can be realized by selecting the control, 
and then using the mouse wheel (up and down). You only see something 
happening on the screen every X-th step, but using an oscilloscope it is 
obvious that every step has an effect. Furthermore, you may SEE the 
"balance" control (in sndvol32.exe) exactly centered (on the screen), 
but in fact it *may* be not. Calibrating the amplitude balance via 
software would cure this, but only as long as no other program does not 
restore the soundcard settings (and set the balance control precisely to 
the center position) .

So much for now, leaving to enjoy the nice WX now ...

73, Wolf DL4YHF .