OK, my misunderstanding ...
73,
... Joe, W4TV
On 2015-07-10 7:18 PM, Wayne Burdick wrote:
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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