Occasional troubles tuning LimeSDR Mini with SDRAngel

[jafa]

Hi,

I see the same problem at 161MHz with a similar spectrum plot where half is missing and it starts to look right towards the higher end of the channel:

Dead spots at 645MHz and 321MHz

Hi, I have the LimeSDR Mini generating 6MHz wide QAM256 cable TV channels… testing setting the transmit center frequency from 57MHz to 999MHz. If I select a frequency from 641MHz to 649MHz the LimeSDR Mini doesn’t output anything (no channel power). If I select a frequency from 320MHz to 323MHz the LimeSDR Mini has similar symptoms. At 323MHz I can see some channel power but not across the full 6MHz bandwidth. If I set any other center frequency in the 57MHz to 999MHz range I see channel pow…

Another post looks related and suggests a cause:

VCOL/VCOM/VCOH Autoselect - Possible Bug?

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): [image] 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,…

Nick