[Linrad] Re: M audio

[attglobal.net; radio1@xxxxxxxxxxxxxxxx>]

Mart,
Where are you?  My friend Thomas Carlson (SMØCXU), who works for 
Ericsson also, is still in Saudi Arabia (I think)

Now, what are these measurements telling me? The noise is on the rise 
after 30 -40 Khz, but that is whatwe were told.  The words seem to say 
that the sampling rate is 96000.  Is that true, if so why not 192000? What 
are the peaks in the *dis bitmaps telling me.  Is the difference between 
the two signifig.? 

you seem to think that the noise might be introduced in the amps, it will be 
interesting to know if we can get it down.  

Thanks for the reply,

John  K1VBM

---- Original Message ----

From: SM0ERR <mart.sakalov@xxxxxxxxxxxx>
To: Linrad <linrad@xxxxxxxxxxxxxxxx>
Cc: 
Subject: [Linrad] Re: M audio
Date: Tue, December 02, 2008, 06:48:00


Hi John

I uploaded some files on unmodified M-audio cards (DELTA44 and AP192).

Spectrum mask at 2.510 MHz at -1dB below saturation and 96 kHz
sampling rate
DELTA44_dist.bmp
AP_192_dist.bmp

and on the same plot with some frequency offset.
DELTA_AP_diff.bmp

The AP192 card is using the AK5385AVF A/D converter and should have
9dB better S/(N+D) compared with the AK4524 used in DELTA44
The noise floor is -148.5 dBc and very similar to the modified DELTA44
card.

For 192kHz sampling.
AP192_noise.bmp

73 SM0ERR Mart







On Dec 1, 10:39 am, SM0ERR <mart.saka...@xxxxxxxxxxxx> wrote:
> Hi John.
>
> I have been using the Audiophile 192 together with WSE converter for
> some time now. The card is outperforming the delta44 at 96KHz sample
> rate, however as Alberto pointed out the noise rise / NF at 192KHz is
> +20 dB.
> I will do some tests bypassing the input OP's..
>
> 73  SM0ERR Mart
>
> On Nov 29, 5:30 pm, John <rad...@xxxxxxxxxxxxx> wrote:
>
>
>
> > What a shame, thanks for the reply.
> > John K1VBM
>
> > On Nov 28, 12:18 pm, AdB <adib...@xxxxxxxxx> wrote:
>
> > > rad...@xxxxxxxxxxxxx wrote:
> > > > Greetings and happy holidays.
>
> > > > While browsing M Audio's site,  http://www.m-
audio.com/index.php?
> > > > do=products.family&ID=PCIinterfaces  , I noticed some new 
products,
> > > > among them some 192 KHz sampling rate cards, I think.  Has any 
one tried
> > > > this interface with linrad? It seem we are always looking for some
> > > > expanded spectrum capture capabilities.  If and when someone 
tries these
> > > > new products please post your resluts.
>
> > > > 73,
> > > > John K1VBM
>
> > > The Audiophile 192 was tested by Marco IK1ODO in his professional 
lab
> > > and found not
> > > very suitable for SDR, as when sampling at 192 kHz, the background 
noise
> > > starts to rise
> > > considerably from 40 kHz up. Not important for audio applications, 
but
> > > very bad for SDR...
>
> > > 73  Alberto  I2PHD- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -




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