[Elecraft] Re: K3 Firmware Rev. 2.76: No AF noise burst; PRE/ATTN independent for sub RX; etc.

[Christopher Kovacs]

Hi Wayne,

No problem, I understand now what's occurring. 

Merry Xmas to all,

Chris

wayne burdick wrote:
> Christopher Kovacs wrote:
>
>> I too still suffer from the notorious "pop" when powering on.  I 
>> would be interested if this change may help.
>
> The "AF noise burst" that is eliminated by the latest firmware was 
> caused by the AGC being turned off until about 2 seconds after 
> power-up. If you had been tuned to a strong station, with the old 
> firmware, you could hear a couple of seconds of very loud audio. That 
> no longer happens.
>
> The "pop" heard in the speaker when turning on is an inherent property 
> of the speaker amplifier IC, and cannot be changed in firmware. If we 
> come up with a way to minimize this, we'll let you know. Meanwhile, 
> you could plug in your headphones just when turning on power; this 
> cuts off the speaker amp.
>
> 73,
> Wayne
> N6KR
>
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> http://www.elecraft.com
>
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