Re: VLF: Clipping or blanking??

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Hello Peter,

Indeed, there was something wrong arround 24 kHz. Now i have switched to 
my /p USB soundcard (that contains its own driver). Now, DHO is 
available :-) Additionally there is a button that allows switching OFF 
the AGC. This improved the wide band overview even much more (it seems 
that the old driver of the PCs soundcard has also used a AGC)! The 9 kHz 
IM is still available but i already have new ideas for tmw...
GN, Stefan/DK7FC


Am 20.05.2010 21:47, schrieb Stefan Schäfer:
> Hello agn,
>
> Hm, maybe the audio driver is a bad one. I had to set up this PC new (win XP) 
> and lost the audio driver. I found a new driver in the web that should be 
> suitable for this mother board but maybe it does not work sufficiently up to 
> 48000... I will check this later with my alternative USB soundcard...
>
> 73, Stefan/DK7FC
>
> ________________________________
>
> Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von pws
> Gesendet: Do 20.05.2010 18:32
> An: rsgb_lf_group@blacksheep.org
> Betreff: Re: VLF: Clipping or blanking??
>
>
>
> Stefan,
>
> You wrote:
>    
> > ...
> > Ok, but it could be a IM with another signal?!
> >      
> No, unlikely, since it appears where a mirrored signal of DHO38 should
> appear at a sample rate of 44 kHz. I don't think that's accidentally.
>
>    
> > Because i know that the
> > sample rate is 48000
> >      
> May be there's a re-sampling process elsewhere in your software.
>
>    
> > and it is successfully locked to GBZ.
> >      
> How to lock the sample rate of a sound card against a MSK modulated signal?
>   The only idea I have is to demodulate it and locking a re-sampling process
> against one of the two carriers - by software. May be there's the key.
>
> Beste Gruesse aus Kiel,
> Peter, df3lp
>
>
>
>
>