[Elecraft] K3S In-Depth Review Coming Soon?

[Stewart]

Hi Ian,
Yes, I keep my K3 pretty well up to date with firmware releases, so if they are 
there I will have them.

A little confused about the redesigned audio. 

You wrote about "redesigned AF output and driver stages. These upgrades were 
introduced in the new KIO3B module".

As I remember the audio stage of my K3 is on the DSP board. Has it been moved, 
or have I misunderstood ?

B.T.W re our conversation at the Convention about ferrites. They have not rusted 
yet :-)

73
Stewart G3RXQ



 
On Wed, 28 Oct 2015 09:57:52 -0000, Ian White wrote:
> Hi Stewart
>
>>I am interested as to whether the corrected DSP AGC algorithms will be
>>available
>>for K3 DSP's.
>
> Your K3 has probably had these DSP changes for some time (assuming you
> have kept the firmware reasonably up-to-date). Future firmware releases
> will apply equally to both the K3S and the K3.
>
> Likewise, all hardware upgrades prior to release of the K3S have already
> been incorporated into K3 production. Hardware upgrade kits are
> available for older models - see the Elecraft website, which also states
> when each upgrade was introduced.
>
> The only only exception listed below is the redesigned AF output and
> driver stages. These upgrades were introduced in the new KIO3B module
> which now forms part of the K3S (a radical redesign which also includes
> USB connectivity for CAT and audio). The KIO3B will eventually be
> available for the K3 as well, as an optional replacement for the older
> KIO3.
>
>
> 73 from Ian GM3SEK
>
>>-----Original Message-----
>>From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
>>Stewart
>>Sent: 28 October 2015 07:42
>>To: Wayne Burdick; Vic Rosenthal 4X6GP/K2VCO
>>Cc: elecraft at mailman.qth.net
>>Subject: Re: [Elecraft] K3S In-Depth Review Coming Soon?
>>
>>I am interested as to whether the corrected DSP AGC algorithms will be
>>available
>>for K3 DSP's.
>>
>>73
>>Stewart G3RXQ
>>On Tue, 27 Oct 2015 13:28:19 -0700, Wayne Burdick wrote:
>>> We've made several changes to improve audio over years, and a K3S
>>incorporates
>>all of them:
>>>
>>> - K3:  improved 12VDC decoupling to the AF amp
>>> - K3:  added a dual low-noise LPF to eliminate residual sampling
> noise
>>(mostly
>>at 12 kHz)
>>> - K3:  corrected DSP AGC algorithms, which were non-monotonic at some
>>signal
>>levels
>>> - K3S: redesigned AF output and driver stages for lower IMD
>>>
>>> Taken together, these changes provide a low-distortion, essentially
> flat
>>audio
>>passband. Most other modern transceivers use the same (or similar)
> class-
>>AB
>>final AF amp devices that we use in the K3/K3S, so how it sounds comes
>>down to
>>how RX EQ is set up, as well as the LO-CUT/HI-CUT (or shift/width)
> settings.
>>>
>>> 73,
>>> Wayne
>>> N6KR
>>>
>>>
>>> On Oct 27, 2015, at 1:10 PM, Vic Rosenthal 4X6GP/K2VCO
>><k2vco.vic at gmail.com>
>>wrote:
>>>
>>>> Operators disagree about K3/K3S audio.