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 > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
