Re: [linrad] Linrd installation...a few comments

["Arie Dogterom" <pa0ez@xxxxxxxxx>]

Rein,
You should mute the input channel and activate capture. Then you will see at
krecord level indicator that there is a recording signal while you do not
hear it. Then running krecord to play it back( goes via the pcm channel) you
should hear the recording. Is that ok, stop krecord and run linrad. Foor
sure you then only will hear linrad processed sounds
73
Arie

----- Original Message -----
From: Rein A. Smit <rein0zn@xxxxxxxxxxxxx>
To: <linrad@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, May 20, 2003 6:01 AM
Subject: Re: [linrad] Linrd installation...a few comments


>
>     Hi John
>
>     What is it, you mean by cheaper onboard sound cards?
>     PCI stuff in particular. There have been issues with sound
>     cards all the way back to FFTDSP by Af9Y and plenty of DSP
>     programs being sensitive to the type of sound cards being
>     Some of them wanted 8 bit cards. I type this on a WIN95
>     machine with a 8 bit card installed. FFTDSP, DSPBlaster
>     run fine under DOS.
>
>     I suppose you are talking about the price of the mother board
>     to a certain extent.
>     Though it would be hard to detect any correlation in the final
>     price of the mother board and the sound section.
>     I have quite a few questions about this sound thing here.
>     Just for the fun, I will research the expensive boards and what they
>     use for onboard audio systems. (  ASUS et al )
>     I have questioned myself whether there is actually a problem with
>     that sound section. However it does everything in WIN98SE and as
>     a matter of fact in Linux as well .
>     It is also working with this krecord program using .wav files
>     In that mode however the mic/line inputs are not being muted.
>     it is not a matter of cross talk, the mic signal passes through
>     un-attenuated  This krecord is neat, you can listen to signals
>     record them in memory and play them back, in my case I have to
>     turn down the audio from the receiver.
>
>     PA0SE has the same audio section running on a laptop and running
>     Linrad. The real strange point is that the alsamixer that he is
>     using from alsa_utils-0.9.3 has the ability to select channels and
>     allows for path switching/selection and I have nothing of that
>     in my installation, as if the mixer adjusts itself to who knows
>     what! The usual volume controls, MIC,LINE, Capture, PCM and
>     MASTER work OK.
>
>     I have been trying to find useful info and there are hundreds
>     of messages of people asking/reporting about that section but
>     it are always problems about no sound at all, distorted sound,
>     low volume etc. I have nothing of that as long as I do not try
>     to get Linrads output. Also Linrad reports the card properly
>     detected and working when I go to the set-up.
>     Do you have Linrad running? If so perhaps you could run through
>
>     http://www.nitehawk.com/linrad_dat/
>
>     Nothing BEATS information from users with a working setup.
>
>     73 Rein, PA0ZN
>
>
>
> "John Harrison, NI1B" wrote:
> >
> > Hi All,
> >
> >    A couple of comments about getting a useful Linrad setup.
> >
> >    MANY of the recent on-board and cheaper internal PCI cards have GROSS
> > problems.
> >
> >    In two cases (one on board and one add on card) the card had NO
> > anti-aliasing filter (at all). The card would pick up high frequency
> > signals and noise and fold it over into the lower freqs with NO
> > attenuation !!
> >
> >    In the other PCI case, the card was apparently very slow in taking
> > samples so virtually NO TIME was left for Linrad :(
> >
> >    ALL of the ISA cards I have tried have had neither of these problems,
> > but try to find a recent motherboard with an ISA slot!!
> >
> >    Anyways just another two technical details to check for when you are
> > selecting a sound card.
> >
> >    warm regards,
> >    john, ni1b
>


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