[Elecraft] K3 Beta Firmware Rev. 3.66: AF output protection

[Steve Ellington]

Works....Sounds like an old time telegraph sounder clicking away.
Is there any means to disable it in the menu?
Before, with AGC off, a static pulse would hit and just produce a distorted 
click but I could still copy cw. Now it completely blanks out everything. 
I'm not too sure I like this feature.
Steve
N4LQ
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "James Sarte" <k2qi.nyc at gmail.com>
To: "Wayne Burdick" <n6kr at elecraft.com>; "Elecraft" 
<Elecraft at mailman.qth.net>
Sent: Tuesday, December 08, 2009 2:36 PM
Subject: Re: [Elecraft] K3 Beta Firmware Rev. 3.66: AF output protection


> That's a great feature; can't wait to try this out at home.  I've been
> deafened more than once by accidentally turning off the AGC!
>
> Thanks Wayne and crew.
> James K2QI
>
> On Tue, Dec 8, 2009 at 2:09 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
>
>> K3 beta-test firmware revision 3.66 (with DSP rev. 2.48) is now
>> available.
>>
>> AF Output Protection: The DSP now senses when AF output would be so
>> strong as to drive the speaker or headphone amplifier into the
>> clipping range. If this happens, AF is muted until you reduce signal
>> levels, protecting your ears (and transducers).
>>
>> Normally, this will only happen if you turn off AGC while an extremely
>> strong signal is present. If you hear the receiver mute under these
>> circumstances, simply reduce gain by some means (back down RF GAIN,
>> turn off the preamp, turn on the attenuator, or turn AGC ON).
>>
>> Another possible source of excessive audio is a DSP numeric overrange.
>> DSP code has been changed to eliminate such cases, and we've had over
>> 100 K3 users field-testing this new code with no reported AF
>> anomalies. But the new AF output protection is always in effect, so it
>> acts as a backup.
>>
>> Please send any questions to k3support at elecraft.com. For instructions
>> on how to load beta firmware, see:
>>
>>      http://www.elecraft.com/K3/k3_software.htm
>>
>> 73,
>> Wayne
>> N6KR
>>
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>
>
>
> -- 
> 73 de James K2QI
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