Audio blast in fw 3.30

[Wolfgang Schwarz -DK9VZ-]

Hi Lyle

I experienced this audio blast for the first time yesterday evening
I try to summarize all the facts:
It occurs while switching from 80 to 40m
80m was on CW and 40m was on SSB
The S-Meter showed maximum signal, but there wasn?t any strong signal
Volume control didn?t seem to function
Only solution was to throw away my headphone and then switch off the trx.

After switching it on again all was functioning normal

I?m using fw 3.30 for some weeks now and even for the latest contests
but didn?t experience this audio blast before. S/N is 2702

Is there already a solution in the new upcoming fw?

--
/*73 de*/
/*Wolfgang DK9VZ*/
[hidden email] <mailto:[hidden email]>

<http://dk9vz.com>

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[wayne burdick]

> Is there already a solution in the new upcoming fw?

Yes. We're still testing to make sure.

The latest field-test revision is 3.40, which also includes several  
new features.

73,
Wayne
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[David Pratt]

In a recent message, Wayne Burdick <[hidden email]> wrote ...
>
>The latest field-test revision is 3.40, which also includes several
>new features.

Do the new features include the facility to enable a preset MON level
when retransmitting DVR off-air recordings?

73

--
David G4DMP
Leeds, England, UK
------



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[Elliott Lawrence-3]

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?
73
Elliott WA6TLA

----- Original Message -----
From: "Wayne Burdick" <[hidden email]>
To: <[hidden email]>
Cc: <[hidden email]>
Sent: Thursday, October 01, 2009 10:38 PM
Subject: Re: [Elecraft] Audio blast in fw 3.30

>> Is there already a solution in the new upcoming fw?
>
> Yes. We're still testing to make sure.
>
> The latest field-test revision is 3.40, which also includes several
> new features.
>
> 73,
> Wayne
> ______________________________________________________________
> Elecraft mailing list
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> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html 

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[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


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[wayne burdick]

No, but this is high on my list.

(I've given up trying to do everything at once.)

tnx
Wayne

On Oct 1, 2009, at 11:23 PM, David Pratt wrote:

> In a recent message, Wayne Burdick <[hidden email]> wrote ...
>>
>> The latest field-test revision is 3.40, which also includes several
>> new features.
>
> Do the new features include the facility to enable a preset MON  
> level when retransmitting DVR off-air recordings?
>
> 73
>
> --
> David G4DMP
> Leeds, England, UK
> ------

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[Geoffrey Downs-2]

Thanks for this post Wayne. Good to know it's working its way up the list -
or rather you're working down it :-)

73

Geoff
G3UCK

----- Original Message -----
From: "Wayne Burdick" <[hidden email]>
To: "David Pratt" <[hidden email]>
Cc: <[hidden email]>
Sent: Friday, October 02, 2009 7:17 PM
Subject: Re: [Elecraft] MON level for DVR retransmission


> No, but this is high on my list.
>
> (I've given up trying to do everything at once.)
>
> tnx
> Wayne

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