[time-nuts] gpsdo 10MHz steering resolution

[ed breya]

One more thing - this is less likely, but possible. Depending on the 
physical setup, it's possible to have magnetic coupling from 
transformers and wiring interfering with sensitive circuitry. This can 
be internal to a piece of equipment (the way it's built), or external, 
like if one piece of gear is adjacent another, with unfortunate 
locations of their various internal items.

Magnetic interference from a transformer will tend to be mostly at the 
fundamental line frequency, while that from wiring loops say, associated 
with the (full-wave) rectifier and filtering will be at the double 
frequency.

These emanations also contribute to overall ground loop currents in a 
system. In highly sensitive setups, even having the chassis of one piece 
electrically contacting (or not) another can make a difference.

These kinds of issues are easy to spot by rearranging things.

Ed