Question. I have a flightaware blue rtl dongle for adsb. It picks up aircraft 
some 100 kms away ok. But when I run it with a software defined radio I don't 
see great amplitudes . Why is that ? I would have expected to see quite large 
signal peaks on the sdr program . Is it because the signal is spread out over 2 
MHz that I can see a distinct signal strength ? Does the signal need to be 
compressed down to a narrower bandwidth ? 

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