Interim firmware release v18c

Now available over in the Downloads area!

This has the following changes:

o Set sensible gain and filter defaults at plug in time (does the same as the “Defaults” button).

o Initialises the tuner and codec _after_ USB enumeration to keep within USB current draw specs.

o Implements different (hopefully better) VHF filtering.

o Implements command 101 – SetFrequencyHz with more granularity using a 32 bit unsigned with the frequency specified in Hz rather than kHz. Also returns actual frequency set.

o Removed sigma delta software imposed limitation on the fractional-N PLL. Need to see what effects this has.

o Recoded the vendor supplied PLL and filter setting code to use constant tables rather than a ton of if/then/else statements.

o Recoded PLL calculation code to use floating point.

Howard