Thanks for the additional information adm & ccs. I have tried a USB tuner with a Si2168 chipset rather than the Si2169-based tuners supplied with the ET10K. When this is used by DVB-T frequency finder I get slightly different error messages, but still the same $FFFF quality value.

I have also tried setting "Force legacy stats" on the tuner configuration page to "yes", in the hope that might help, but it stopped DVB-T frequency finder from finding any muxes.

Incidentally, it has just occurred to me that the quality-generating code has probably been written in C, and $FFFF as a 16-bit word equals -1, which is what one might expect when no quality information is available.


EMJB