I found this behavior using CubicSDR and was able to reproduce with LimeSuite as well.
I have a signal at ~59 MHz (RX port). I can see it when I’m tuned to 60 Mhz, and can’t at 61 MHz. I noticed this is the range when VCO switch should occour (VCOH -> VCOL):
To reproduce in LimeSuite, at SXR tab:
- calculate and tune to 80Mhz (VCOM is autoselected),
- calculate and tune to 60 Mhz (VCOH is autoselected).
- calculate and tune to 61 MHz (VCOM!!! is autoselected)
Note, it’s not deterministic, but I can reproduce it with ~90% probability.
Possibly also related: