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From: | Martin Dvh |
Subject: | Re: [Discuss-gnuradio] Squelch block, AGC function and scanner example |
Date: | Wed, 19 Jan 2005 05:06:07 +0100 |
User-agent: | Mozilla Thunderbird 0.9 (X11/20041124) |
Eric Blossom wrote:
On Tue, Jan 18, 2005 at 08:36:07PM +0100, Martin Dvh wrote:-----------------------------------Is there a way to access the magnitude of the channel to setup a squelch function? How would that work with this chain of blocks? Is there another block that would go in the chain to zero the output if the I*I + Q*Q of the signal is below a threshold?Martin, you rock! Thanks for cranking out all this code! Eric
Well, there is more to come. I am also working on some fft spectrum_magick code. This will be a scannerlike app or block with which you can scan the entire rf-spectrum and you will get the entire static rf-spectrum (averaged over a specified time-period) It will make a list of the static spectrum peaks in there. But it will also find the frequencies which have sometimes a peak and sometimes not and make a list of them. I hope also to find a way to determine what kind of signals they are (FM, AM, TV, FSK) This way you get a list of everything there is to receive with your current frontend. I am also still working on my tvcard as frontend hardware-modifications and driver. This will make a standard bttv tv-capture card usable as gnuradio frontend (both tuner and ADC) You could also combine the tuner in the tv-card with an usrp/mc4020 or a microtune tuner with the bttv ADC. I am receiving and demodulating signals but it still has a lot of interference and some timing problems. I think I need to buy/design/built a better IF filter and amplifier for this to work better. Greetings, Martin
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