[Elecraft] K3: Upgrade or replace

[Wayne Burdick]

> 1) modified bias in the speaker amplifier *driver* (not the amp
>   itself) for improved linearity.  

The power amp itself has in fact been updated. And there's a new AF driver stage. 

Wayne


> This does not affect the power
>   output or frequency response.
> 2) 5/10/15 dB stepping on the *main receiver* attenuator (this
>   does not affect the KRX3 which remains at 0/10dB)
> 3) improved isolation on the main RF board due to a change from
>   two to four layer construction.  The difference is probably not
>   measurable on the air.
> 4) a change in RF output devices in the KPA3 - difference TBD.
> 
> The other change is the KIO3B which provides the option of an
> internal USB interface for radio control and USB CODEC ("sound
> card").  A traditional RS-232 interface is more flexible and a
> *high quality* external sound card or *well designed* audio
> interface *may* provide a somewhat lower noise floor (better
> SNR/dynamic range).  Most users will probably not notice a
> performance boost unless they are using one of the notoriously
> "dirty" (cheap) amateur products.
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 
>> On 2015-07-10 12:21 PM, Jim Brown wrote:
>>> On Fri,7/10/2015 6:07 AM, Bill wrote:
>>> I am not a DXer or contester - merely a rag chewer on 75 and 40.
>> 
>> For your operating interests, the only thing I would do is upgrade to
>> the new synth board. I consider that 90% of the difference between the
>> K3 and K3S. I did that, and because 6M is important to me, I also bought
>> the new KXV3B to get the new preamp. I had previously been using an
>> outboard ARR GasFET preamp.
>> 
>> 73, Jim K9YC
> 
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