2-byte Signal Quality Index Format (DB_SQI2)

Stored linearly using 16-bits as follows:

S Q I = ( N − 1 ) 65533
0 SQI data not available at this range
1 0.00000
2 0.00002
128 0.00194
65533 0.99998
65534 1.00000
65535 Area not scanned