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Re: [Discuss-gnuradio] gnu radio with a soundcard

From: Theo Verelst
Subject: Re: [Discuss-gnuradio] gnu radio with a soundcard
Date: Sun, 31 Aug 2008 00:08:13 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax)

John R. wrote:
Mathew George wrote:

Hi all,

Can someone explain how we may build a FM/SW receiver using A/D D/A converter in a sound card and minimal additional hardware? Somewhere I have read that this is possible, in principle, but could not yet gather info suitable for a novice.

I am attempting the same general thing. I am pretty sure you will need a radio receiver that has an IF output. My AOR 8200 has a discriminator output which I think is something different. In theory it has an IF output also but have not seen anything showing how to use it.


Well, I´m sure you´ll have to decide on what you want, because great FM
sound by feeding something through a sound card isn´t sounding realistic.

You can not get more informations per second generally from a
soundcards´ output than you put in the input, roughly...

So you could detect and such signals which could be sampled from some
receiver if the bandwith would be limited to what a soundcard can
digitize, so without aliasing that would be 20kHz or maybe higher. The
intermedeate frequency in radios would be much higher, more megaherzes

A discriminator output may be applicable, but the processing of such a
signal into a FM decoded signal may not be what sr is usually used for.

In most cases the much higher sampling rate of the hardware device for
sr is needed to get a demodulatable signal I think, as well the
soundcard input may have not right impedances compared with radio boards.

Very low frequency signals could be AD converted by soundcard, or a
signal with small bandwidth mixed into the audio band.


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