It seems in RX, in single channel, the NCO up and downconvert is limited by the sampling rate as follow
- must always be < 80MHz
- must be
< sampling rate * 16
For TX in single channel it’s the same, except it’s
<= sampling rate * 16
In dual channel, it seems that in RX if the sampling rate is
>= 40MS/s, then the NCO must be
<= sampling rate
< 40MS/s, then it’s back to
< sampling rate * 16as long as it’s < 80MHz
In dual channel in TX it’s the same except the conditions are
> 40MS/s and
Is this how the NCO is programmed?
Also, what is the impact of the NCO with regard to the sent/received signals? Should I try to keep it to a minimum? Does that minimum depend on the sampling rate?
Eg in dual RX, I use 55MS/s at 2450MHz with NCO +/- 23MHz to listen on 101MHz with some overlap in the middle.