Hi,

My PR155 has 50 Hz phase modulation sidebands on the interpolating VFO, when
operating from AC mains. It's clean running from external DC, but the
sidebands return if the mains transformer primary is energised with the
secondary open-circuited. Could it be the magnetic field? Has anyone else
noticed this?

Spectra -
http://www.holmea.demon.co.uk/Misc/AC.png
http://www.holmea.demon.co.uk/Misc/DC.png

TIA
Andrew.