Cheap PLLs, yes. A lot depends on the quality of the
controlled oscillator. You can use a PLL to steer a
crystal oscillator (oh so gently), and get minimal
phase noise. Effectively, the crystal filters the
noise sidebands. It could be a lot better than the
excellent Orion VFO, for example, which has to work
over a wide frequency band.
73, Martin, AA6E
p.s. I guess this confirms Dave's later note, FWIW!
--- David McClafferty <firstname.lastname@example.org> wrote:
> I am only going by what I have experienced and read,
> PLL's produce more phase noise than xtals
> Dave, VE1ADH
> --- John Clifford <email@example.com> wrote:
> > > But why would you want to do it? Changing to a
> > will
> > > increase the phase noise.
> > Are you saying that having PLL control over the
> > xtals would increase
> > phase noise?
> > How?
> > - jgc
> > John Clifford KD7KGX
> > Elecraft K2 #1678
> > /KSB2/KIO2/KBT2/KAT2/KNB2/KAF2/KPA100
> > Ten-Tec Omni VI/Opt1, Centaur, 238B
> > Alinco DR-605TQ, DJ-V5
> > Icom T90A
> > IRLP #3978
> > email: firstname.lastname@example.org
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