[Elecraft] Frequency Reference (was: Mini Modules)

[Bud Rogers]

On Sunday 19 October 2003 17:57, John A. Magliacane wrote:
> The biggest hinderence I've observed in WWVB reception appears to be
> the 1000th harmonic of power line noise because it s-l-o-w-l-y sweeps
> back and forth across WWVB's frequency. =A0(Now I understand that 60 Hz
> is an AVERAGE. =A0The power line frequency seems to constantly move
> around

Wow.  I never would have imagined that the 1000th harmonic of anything=20
would be a significant factor in radio reception.  But you are=20
absolutely right about power line frequency.  It routinely wanders=20
around 60 Hz in more or less random fluctuations lasting from a few=20
seconds to sometimes minutes or hours.  Deviations are typically a few=20
millihertz.  The collection of systems within systems that manage to=20
keep it that close (most of the time) would make Rube Goldberg proud. =20
And then from time to time we deliberately deviate the frequency plus=20
or minus 20 millihertz to keep the clocks on time...

=2D-=20
Bud Rogers  <budr@netride.net>  KD5SZ  EM05vb