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

[Chris Johnson]

Pardon my ignorance, but can I get some clarification on a few things?

1)  Is phase noise the measurement of the instability of an DDS?  If so, does this mean a cheap part is being used?  Does a GPSDO or a OCXO reduce phase noise?

2)  How does this impact TX only, and why does it create such an issue to nearby listeners?

3) Does phase noise go down if you use a faster master clock?  The Flex 6700 uses a 983.04mhz vs a 122.99Mhz clock in the 6300.

4) Do low phase noise radios allow in-band use, such as someone on CW on 20M and someone up on voice on 20M?  What is considered a low value?

Sorry for so many questions, but this is still a very difficult concept for me to grasp.

Thanks

Chris

On Jun 6, 2014, at 8:18 AM, Wayne Burdick <n6kr at elecraft.com> wrote:

> 
> On Jun 6, 2014, at 4:33 AM, Stewart Bryant <stewart at g3ysx.org.uk> wrote:
> 
>> My understanding is that the KX3 is worse than the K3 on TX
>> phase noise sidebands. Is that what you would expect?
> 
> No. Both have very, very low transmitted phase noise.
> 
> 73,
> Wayne
> N6KR
> 
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