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[linrad] Re: Knoppix CD audio

   Hi Mike,

The first message went out by accident! Phone call broke u the internet 
here and it slipped through! Soory

You must have a receiver there, Tune the receiver to a signal on 40 or 
80 and make sure you hear a cw
signal in your headphone or speaker.. Connect  the output audio of your 
receiver, headphone or what have
 you and watch the cw signal  on the frequency display of linrad. You 
should see a  peak being modulated by the
 signal ( 300 - whatever Hz  most likely 3000 Hz)  You might also see 
the pass band of your receiver or the xtal filter.
There  will be a higher noise level over limited width of the display (  
1.8 Khz or 500 Hz wide band.)
When you do this, set your sampling rate of your read card section to 
6000 Hz or 8000 Hz., your output
card is probably running at 48 kHz. sampling rate.

If you see this put the cursor on the center of this peak or on the top.

A vertical line should be visible over the peak. Having made this 
selection your
audio. from the sound card should start if all is OK.

Try a peak height of 10 scale Divs. above the noise , the base line.

Look now at your filter display, middle of screen, in particular the 
left side
of that display. You might see a red line or block. This is a slider. 
Turn up
the slider with your cursor. On that side of the display should also be 
a little
white block, Turn the slider so that the white block is in the middle of the
display being moved by the audio. If you turn the slider too high , the 
spot will turn
red , overload.
If you see this white spot moving and the sound card is properly set, 
you should hear
audio ( cw or a constant tone for a carrier ). In that same window you 
should see a red
line straight or broken in 3 pieces. This is an oscillator ( BFO 
adjustment) Again move the bottom of the
middle section of that red line and change the beat frequency of the 
incoming signal. like a normal bfo
in a receiver ( boat ancker )

Is easier to do this testing with a defined signal  from your receiver 
than from a HF mixer/LO
source at this point

If you are lucky and 40 is open you might see other carriers or cw 
signals in the same display.
side by side

In this mode you have a spectrum analyzer , sweeping 3 or 4 KHz  of audio

In my first installation I had the white spot sittng at the bottom and 
no audio.!
Even after many questions answerd here

If you listen to noise, again you should see that block moving with  the 
noise signal at the point of your cursor
line in the spectrum

I think even if you were to have a problem with the output of the sound 
card you should see the
white dot moving. If you see the audio signal on the display you have 
your own tool to bootstrap
to a operational system.

If you know all this already, pse ignore this email. l

73 Rein W6/PA0ZN








Mike(W5UC) & Kathy(K5MWH) wrote:

> At 12:40 AM 5/14/2005 +0200, you wrote:
>
>> > turned up in the Kmix pannel?
>> Maybe. You might make a screen dump by pressing 'G'
>> and send that to me off-list.
>
>
>
> I will run the experiments that you suggested. I went ahead and did 
> the screen dump. NOW, again I need help.  I don't have the foggiest 
> idea where the screen went, or where to look for it.  Once i find it, 
> I need to try to move it into this machine on the local network so I 
> can send it to you, If you, or anyone else has any idea where the pic 
> went, please let me know.  Is it a .gif ?  Meanwhile I will try to run 
> the experiments that you suggested.
>
> One other thing about the input to the Line-in port. I can see a 
> change in the level in the frame below the waterfall as I vary the 
> input, so I know there is something going into the software.  I just 
> can't see the carrier on the waterfall?
>
> Do the numbers above the waterfall represent the audio bandwidth that 
> the software is seeing?
>
> 73,
> Mike
>
>
>
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