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Date: Fri, 21 May 2010 00:15:20 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1BFB@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Subject: Re: VLF: Clipping or blanking??
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Hello Peter,

Indeed, there was something wrong arround 24 kHz. Now i have switched to=
=20
my /p USB soundcard (that contains its own driver). Now, DHO is=20
available :-) Additionally there is a button that allows switching OFF=20
the AGC. This improved the wide band overview even much more (it seems=20
that the old driver of the PCs soundcard has also used a AGC)! The 9 kHz=
=20
IM is still available but i already have new ideas for tmw...
GN, Stefan/DK7FC


Am 20.05.2010 21:47, schrieb Stefan Sch=E4fer:
> Hello agn,
>
> Hm, maybe the audio driver is a bad one. I had to set up this PC new (wi=
n XP) and lost the audio driver. I found a new driver in the web that shou=
ld be suitable for this mother board but maybe it does not work sufficient=
ly up to 48000... I will check this later with my alternative USB soundcar=
d...
>
> 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:
>   =20
>> ...
>> Ok, but it could be a IM with another signal?!
>>     =20
> 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.
>
>   =20
>> Because i know that the
>> sample rate is 48000
>>     =20
> May be there's a re-sampling process elsewhere in your software.
>
>   =20
>> and it is successfully locked to GBZ.
>>     =20
> How to lock the sample rate of a sound card against a MSK modulated sign=
al?
>   The only idea I have is to demodulate it and locking a re-sampling pro=
cess
> against one of the two carriers - by software. May be there's the key.
>
> Beste Gruesse aus Kiel,
> Peter, df3lp
>
>
>
>
>   =20