[Elecraft] Audio blast in fw 3.30

[Wayne Burdick]

Elliott Lawrence wrote:

> Have you found a configuration(s) that can replicate the audio blast  
> event? What will be the possibility that it won't occur again as it  
> wasn't anticpated in the release (3.25?) that caused the problem?

It's an extremely rare side-effect of a transient event, such as a  
band change or NR on/off, in the presence of specific incoming signal  
conditions. Effective NR algorithms are particularly susceptible to  
numeric overrange, and there have been many attempts in the industry,  
some patented, to prevent it.

We changed the DSP initialization sequence during band change (etc.),  
and also put self-checks in place to limit gain during transients. If  
they occur, they're now corrected internally, completely transparent  
to the operator.

So far it appears to be working very well. But we sent the code to  
about 150 early adopters to make sure.

73,
Wayne
N6KR