sBitx passband spectrum
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I removed the alsa code from the reference implementation and managed to grab the real radio passband in the spectrum (pic 1 the passband with noise, and pic 2 the passband with a broadcast signal. I can clearly see around 20 kHz of passband - so we can even receive DRM30 in 20 kHz mode (and transmit too)!
: ) - Rafael PU2UIT |
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In lower frequencies (eg. 40m and anything less than 7 MHz) I get some strange noises, as attached (bottom graph is the radio rx, top is the mic rx). May be it is my psu, need to test with a battery.
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Rafael On 7/13/23 10:52, Rafael Diniz wrote:
roughly speaking, the passband is around 6 kHz to 38 kHz. |
