a) Here is a screenshot of 16 bit noise @ 12 MHz:
b) Here is a screenshot of the same noise with 8 bit samples:
c) 8 bit noise, tuned to 12.5 MHz
- Why does b) show a lobe while a) does not?
- Why do b) and c) show lobes at the same pixels (vs shifted .5 MHz)?
The spectrum should be entirely noise. The signal is from an antenna
plugged into a front end that brings 1.57542GHz (GPS L1) to 12MHz.