Tvheadend

Hi,

I don't have any reason to beleive this is a tvheadend problem...but hopefully someone can give some advice!

I have been using tvheadend for a while now, with no real problems.
I am using a TBS-6280 dual DVB/T2 tuner running on a HP microserver running linux mint 13 (kernel 3.2.0)
The RF in socket on the sual tuner card is connected, the RF-out is not

Recently I have noticed that whilst the mux strength measured for mux on each tuner is stable at 100%, the individual signal strength when tuned to a channel often drops to between 80-85%, at which point video quality suffers massively.

What is the relationship between these two figures? The fact the mux strength is so stable whilst the channel signal strength varies...?

It could be a signal strength problem - though I am on a block-wide distributed TV system so in theory it should be fine.

I have tried various combinations of tuner settings to no real effect...
I have also tried various tvheadend releases, including the latest from git, which seemed to work with the caveats above.

Cheers,

Ben