maximum number of DVB/ATSC adapters

configname: CONFIG_DVB_MAX_ADAPTERS

Linux Kernel Configuration
└─>Device Drivers
└─>Multimedia support
└─>Digital TV options
└─>maximum number of DVB/ATSC adapters
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Maximum number of DVB/ATSC adapters. Increasing this number
increases the memory consumption of the DVB subsystem even
if a much lower number of DVB/ATSC adapters is present.
Only values in the range 4-32 are tested.

If you are unsure about this, use the default value 16