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

[Iain MacDonnell - N6ML]

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.

FWIW, the "pop" doesn't bother me at all... the "burst" was extremely
loud, even with no signal, on a noisy band. I'm quite happy with the
fix.

Thanks!

     ~Iain / N6ML