VCOL/VCOM/VCOH Autoselect - Possible Bug?

[zsellera]

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:

1. calculate and tune to 80Mhz (VCOM is autoselected),
2. calculate and tune to 60 Mhz (VCOH is autoselected).
3. calculate and tune to 61 MHz (VCOM!!! is autoselected)

Note, it’s not deterministic, but I can reproduce it with ~90% probability.

Version: 19.04.1-PhotosSDR-2020.01.26-vc14-x64
Windows build

Possibly also related:

Occasional troubles tuning LimeSDR Mini with SDRAngel

Usually, when tuning my Lime board (to, for instance, a NWR station), I get a spectrum like this: [Selection_089] Just what you’d expect. (I’m not sure what the broader bands are—they move in the opposite direction of tuning, or sometimes vanish if I tune e.g. 163.550 instead of 162.550. Any ideas what they might be?) Sometimes, though, I get something like this: [Selection_090] When I do, the pattern stays more or less the same tuning up and down the spectrum. (I’ve seen a similar issue …

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…