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jason_58201

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i have a sigma tel sound card on my dell and i'm not getting any signal on unitrunker, i heard that uni doesn't work with sigma tell, is that true?
 

CrewRest

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I've been using one on my Sony Vaio and on a Gateway with no trouble!

I'm going to try a Turtle Bay external USB soon.

Doug Anderson
KG4QCR
 

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jason_58201 said:
i have a sigma tel sound card on my dell and i'm not getting any signal on unitrunker, i heard that uni doesn't work with sigma tell, is that true?
Where did you hear that? Run the UniScope program and walk yourself through the usual troubleshooting steps. Here goes ...

Do NOT plug the audio cable in just yet.

Run Uniscope in Oscilloscope mode; select the input you think is right, use 16 bit samples at a rate of 44100, 48000, or 96000 samples per second. Higher is better but not all hardware support higher rates (most modern stuff does).

Is the 'scope trace flat?

No: you've selected the wrong input (or something is seriously wrong) - plug the cable into a different input or go the start of the these instructions, select a different input for Uniscope and start over.

Yes: great, let's move on.

Plug the audio cable into the sound input (which ever you think is correct). Observe the 'scope display while doing so.

Did the 'scope trace jump as the connection was made?

No: you've selected the wrong input - plug the cable into a different input or go the start of the these instructions, select a different input for Uniscope and start over.

Yes: Great, let's move on.

Our goal in this next section is to adjust for a good signal level. Too low will produce anemic waveforms that aren't decodeable. To high will clip the positive and negative extends of the waveform resulting in a loss of information. You'll need to find the recording level setting for this input. Hidden in the audio recording control panel - some audio drivers provide recording volume control, other provide an on/off +20 db gain checkbox. Others may provide both or neither. After you've located this control - have it ready to make your level adjustment.

You'll want a realistic signal so tune your radio to a know control channel.


Do you see a flat-line or near-flat waveform? (even noise should produce some movement)

Yes: adjust the signal higher (increase level or check the +20db checkbox). If the peaks start to flatten - you've gone too far. You'll want to back down just a bit.

Do you see square(ish) waves with abrupt corners?

Yes: too much gain! Turn OFF the +20db checkbox or turn down the level - or both.

Somewhere between the two is a happy medium that does not mute or clip the waveform.
 
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