Topband: BAD OT:Phase noise *** RE: digital on 1838 +/-

[Greg - ZL3IX]

Jeff, I suspect that you mean modern day synthesisers rather than 
specifically DDS.  Actually, the DDS itself has quite low phase noise, 
better than -130 dBc/Hz with Analog Devices chips,  especially if the 
internal multiplying PLL is not used in the reference path.

73, Greg. ZL3IX

On 2011-12-31 06:30 p.m., Jeff Blaine wrote:
> Phase noise is generated by the rig's LO and exists as a more broad band low
> level signal.  Issue is more significant with modern day DDS than with older
> analog-type VFO sources.  Guys who operate field day can relate...
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>