[Elecraft] Why is KX3 phase noise so much less than the K3 ?

[Phil Wheeler]

I agree, Matt, and every rig I use now is an 
Elecraft (K3, KX3, K2, ...).

But the question the OP posed was K3 vs. KX3: "I'm 
wondering why the KX3 Lo noise is so much better 
than the K3"

73, Phil W7OX

On 4/2/14, 8:06 AM, Matt Zilmer wrote:
> It's easy to demonstrate this.  My real-world setting is Field Day,
> and the example is actually what my team experienced.
>
> Take four rigs in a Field Day setting, within 100 yards of each other.
> Make sure one of them is a K3, and the others are Y/K/I types.
>
> On the same band, any of the Y/K/I rigs will create so much wideband
> [phase] noise on transmit that none of the other rigs are usable on
> receive.  Transmit on the K3 and all the other rigs are usable on
> receive (same band, mind you).  No BPF required in this case.
>
> This is very real-world.  It's also the reason DXpeditioners use
> Elecraft products in close proximity with no ill effects.  Field Day
> is just my Regular Joe example of the same thing.
>
> Yes, there is a huge difference - not just a statistic for the charts.
>
> 73,
> matt W6NIA