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Re: [Discuss-gnuradio] LW/AM/SW radio very cheap in laptop?
From: |
Firas Abbas |
Subject: |
Re: [Discuss-gnuradio] LW/AM/SW radio very cheap in laptop? |
Date: |
Thu, 2 Apr 2009 02:35:18 -0700 (PDT) |
Hi,
--- On Thu, 4/2/09, John Gilmore <address@hidden> wrote:
> There's another chance to get kids into radio...
>
> If a high volume kids' laptop had stereo "HD audio" ports available
> (24-bit 192 kHz converters, 95 db input and 100 db output), how cheap
> and small a circuit could you build onto that motherboard to provide
> useful LW/AM radio reception?
>
> John
Here is my 2 cents:
1) AM signals known to be strong, RF Gain may not be required.
2) Undersampling can be used to downconvert/digitize AM signals.
3) RF Tunning is the problem. We have to think for away to use the voltage from
one of the audio output ports to control a bandpass filter center frequency
(voltage controlled filter).
4) Software demodulation.
Best Regards,
Firas