<[EMAIL PROTECTED]> wrote:
>
> [snip]
> I am currently finishing an home build SDR receiver front end
> project (very much) based on Gerald Youngblood's design published
> back in 2003.
> [snip]
> I have a problem though, for some reason I can not fully calibrate
> the skew of the SB Audigy board, both the phase and amplitude
> cursors should actually be set to some position outside their
> range.
> I did the same exercise with an old SB PCI128 board, this one can
> be calibrated all right within the range of the cursors.
Jean ,
I have no direct experiences with that card, but there are messages
on various groups that report that some model from Creative have the
left and right channels skewed by one sample in time. Probably this is
caused by the use of a single ADC multiplexed between the two
channels. Some other SDR softwares have an option to delay one of the
channels by one sample, to cope with this.
Given that at 96 kHz sampling rate, one sample time is about 10.41
usec, you could try with SDRadio to set the sampling rate at 96 kHz,
leave the amplitude balance control at its middle, and then change the
phase slider adjusting it for 10.41 usec (plus or minus, you have to
experiment with this). Please report your results, thanks.
>
> Another thing that would be nice, is the possibility to set the
> centre frequency of the spectrum display of SDRadio by an external
> program, the little application in VB6 in my case. So that it
> would be possible to actually change the frequency including the
> spectrum display in one single GUI action. Maybe having some API
> on SDRadio or possbly a global variable that would be read by
> SDRadio.
>
Yes, this would be useful, and I have already implemented it in
Version 1.0 of Winrad which will be released in a couple of weeks.
Winrad now supports external hardware through an add-on DLL, the first
being coded is that for the SDR-14. When I will update SDRadio I will
add this feature also to it.
> As I use to listen in on the digtal modes (RTTY, HF fax, ...) I use
> other programs such as Hamscope connected to the output of SDRadio.
> This is done by actually patching the analog signal from the line
> out of one sound board (the one with SDRadio) to the line in of the
> other sound board (the one with Hamscope). It would be nice if
> SDRadio would have some means to perform this on the internal
> digital signal, avoiding a DA and AD conversion.
This can be done using the product Virtual Audio Cable, that
implements a direct channel between the output of a sound card program
and the input of another one. Search with Google for that name and you
will find it. And with VAC you will need just one sound card, not two.
73 Alberto I2PHD
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